{"id":2236,"date":"2022-01-06T14:08:06","date_gmt":"2022-01-06T07:08:06","guid":{"rendered":"http:\/\/vafs.gov.vn\/en\/?p=2236"},"modified":"2023-11-23T12:24:51","modified_gmt":"2023-11-23T05:24:51","slug":"vietnam-journal-of-forest-science-number-6-2021","status":"publish","type":"post","link":"https:\/\/vafs.gov.vn\/en\/2022\/01\/vietnam-journal-of-forest-science-number-6-2021\/","title":{"rendered":"Vietnam Journal of Forest Science Number 6-2021"},"content":{"rendered":"

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T\u1ea0P CH\u00cd KHOA H\u1eccC L\u00c2M NGHI\u1ec6P S\u1ed0 6 – 2021<\/p>\n\n\n\n\n\n\n\n\n\n
12<\/td>\n\u0110\u1eb7c \u0111i\u1ec3m v\u00e0 vai tr\u00f2 c\u1ee7a v\u1ed1n x\u00e3 h\u1ed9i trong b\u1ea3o v\u1ec7 v\u00e0 ph\u00e1t tri\u1ec3n r\u1eebng c\u1ed9ng \u0111\u1ed3ng \u1edf khu v\u1ef1c B\u1eafc Trung B\u1ed9<\/td>\nCharacteristics and effects of social capital on community forest management in the North Central Region<\/td>\nNg\u00f4<\/em> V\u0103n H\u1ed3ng,
\nB\u00f9i Th\u1ebf \u0110\u1ed3i,
\nTr\u1ea7n Ng\u1ecdc H\u1ea3i,
\n\u0110\u1ed7 Anh Tu\u00e2n<\/em><\/td>\n		125<\/td>\n<\/tr>\n
13<\/td>\nNghi\u00ean c\u1ee9u \u0111\u1eb7c \u0111i\u1ec3m v\u1eadt li\u1ec7u ch\u00e1y v\u00e0 nguy c\u01a1 ch\u00e1y r\u1eebng t\u1ea1i t\u1ec9nh \u0110\u1ed3ng Nai<\/td>\nFlammable materials characteristics and forest fire risk: case study in Dong Nai province<\/td>\nD\u01b0\u01a1ng<\/em> Huy Kh\u00f4i,
\nTr\u1ea7n Quang B\u1ea3o,
\nV\u00f5 Minh Hoa\u0300n,
\nNguy\u1ec5n Th\u1ecb Hoa<\/em><\/td>\n		138<\/td>\n<\/tr>\n
14<\/td>\nNghi\u00ean c\u1ee9u ph\u00f2ng ch\u1ed1ng b\u1ec7nh ch\u00e1y l\u00e1 b\u1ea1ch \u0111\u00e0n\u00a0do n\u1ea5m Cryptosporiopsis eucalypti<\/em><\/td>\nControl of Cryptosporiopsis eucalypti <\/em>causing leaf blight disease on Eucalyptus<\/td>\nB\u00f9i<\/em> \u0110\u01b0\u0301c Giang, L\u00ea Th\u1ecb Xu\u00e2n, Tr\u1ea7n Xu\u00e2n Hinh<\/em><\/td>\n152<\/td>\n<\/tr>\n
15<\/td>\nT\u00ecnh h\u00ecnh g\u00e2y h\u1ea1i, \u0111\u1eb7c \u0111i\u1ec3m sinh h\u1ecdc c\u1ee7a lo\u00e0i s\u00e2u \u0103n l\u00e1 (Eurema<\/em> blanda <\/em>Boisduval, 1836) h\u1ea1i keo lai v\u00e0 Keo tai t\u01b0\u1ee3ng t\u1ea1i t\u1ec9nh Qu\u1ea3ng Nam<\/td>\nDamage status and some biology characteristics of Eurema blanda <\/em>(Boisduval, 1836) leaf eating acacia hybrid and Acacia mangium <\/em>wild. in quang nam province<\/td>\nTr\u1ea7n<\/em> Vi\u1ebft<\/em> Th<\/em>\u1eafng,<\/em> L\u00ea Th\u1ecb Xu\u00e2n, Trang A T\u1ed5ng<\/em><\/td>\n159<\/td>\n<\/tr>\n
16<\/td>\nTh\u00e0nh ph\u1ea7n b\u1ec7nh h\u1ea1i c\u00e2y Sa m\u1ed9c (Cunninghamia<\/em> lanceolata <\/em>Lamb.) t\u1ea1i m\u1ed9t s\u1ed1 t\u1ec9nh mi\u1ec1n B\u1eafc Vi\u1ec7t Nam<\/td>\nThe disease on China fir (Cunninghamia<\/em> lanceolata <\/em>Lamb.) in several provinces in the North of Vietnam<\/td>\nNguy\u1ec5n<\/em> Ho<\/em>a\u0300<\/em>i<\/em> Thu,<\/em> \u0110\u1eb7ng<\/em> Nh\u01b0 Qu\u1ef3nh, Tr\u1ea7n Nh\u1eadt T\u00e2n, Trang A T\u1ed5ng,<\/em><\/p>\n

Nguy\u1ec5n<\/em> Th<\/em>\u1ecb<\/em> Minh<\/em> H\u1eb1ng<\/em><\/td>\n

166<\/td>\n<\/tr>\n
17<\/td>\n\u0110i\u1ec1u ki\u1ec7n sinh tr\u01b0\u1edfng ph\u00e1t tri\u1ec3n c\u1ee7a s\u00e1u ch\u1ee7ng vi khu\u1ea9n sinh m\u00e0ng nh\u1ea7y v\u00e0 \u1ee9ng d\u1ee5ng nh\u1eb1m t\u0103ng \u0111\u1ed9 \u1ea9m v\u1edbi v\u1eadt li\u1ec7u ch\u00e1y<\/td>\nConditions for growth and development of<\/p>\n

6 strains of mucous membranes production bacteria and application to increase humidity of flammable material<\/td>\n

V\u0169<\/em> V\u0103n \u0110\u1ecbnh, Ph\u1ea1m V\u0103n Nh\u1eadt, Tr\u1ea7n Nh\u1eadt T\u00e2n<\/em><\/td>\n174<\/td>\n<\/tr>\n
18<\/td>\nNghi\u00ean c\u1ee9u quy tr\u00ecnh t\u1ea9y tr\u1eafng g\u1ed7 B\u1ed3 \u0111\u1ec1 cho s\u1ea3n xu\u1ea5t composite g\u1ed7 nh\u1ef1a th\u1ea5u quang<\/td>\nResearch on the process of bleaching Styrax tonkinensis <\/em>(Pierre) wood for the production of transparent wood<\/td>\nNguy\u1ec5n<\/em> Th<\/em>\u1ecb<\/em> Tr\u1ecbnh,<\/em> Nguy\u1ec5n<\/em> Th<\/em>\u1ecb<\/em> Minh P<\/em>h\u01b0\u01a1ng,
\n<\/em>\u00a0<\/em>Nguy\u1ec5n<\/em> B\u1ea3o Ng\u1ecdc<\/em><\/td>\n		180<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n\n\n\n
19<\/td>\nM\u1ed9t s\u1ed1 \u0111\u1eb7c \u0111i\u1ec3m c\u1ea5u t\u1ea1o \u0111\u1eb7c bi\u1ec7t \u0111\u1ec3 nh\u1eadn bi\u1ebft g\u1ed7<\/p>\n

Sa m\u1ed9c d\u1ea7u Cunninghamia konishii <\/em>Hayata<\/td>\n

Cunninghamia<\/em> konishii <\/em>Hayata and some special anatomical characters for identification<\/td>\nV\u0169<\/em> Th<\/em>\u1ecb<\/em> H\u1ed3ng<\/em> Th<\/em>\u1eafm,<\/em> L\u01b0u Qu\u1ed1c Tha\u0300nh, V\u0169 Th\u1ecb Ngoan,<\/em><\/p>\n

B\u00f9i<\/em> H\u1eefu Th\u01b0\u1edfng<\/em><\/td>\n

187<\/td>\n<\/tr>\n
20<\/td>\nL\u1ef1a ch\u1ecdn ch\u1ebf ph\u1ea9m ph\u00f2ng ch\u1ed1ng n\u1ea5m m\u1ed1c cho L\u00f9ng (Bambusa<\/em> longgissia <\/em>sp.nov) l\u00e0m nguy\u00ean li\u1ec7u \u0111\u1ec3 s\u1ea3n xu\u1ea5t h\u00e0ng th\u1ee7 c\u00f4ng m\u1ef9 ngh\u1ec7<\/td>\nSelection the wood preservatives for treatment of Bambusa longgissia <\/em>sp.nov against mold for making handicraft goods<\/td>\nB\u00f9i<\/em> Th<\/em>\u1ecb<\/em> Th<\/em>\u1ee7y,<\/em><\/p>\n

\u0110o<\/em>a\u0300<\/em>n<\/em> Th\u1ecb<\/em> B\u00edch<\/em> N<\/em>g\u1ecdc,<\/em> Ho<\/em>a\u0300<\/em>ng<\/em> Th\u1ecb<\/em> T\u00e1m,<\/em> Nguy\u1ec5n<\/em> Th<\/em>\u1ecb<\/em> H\u1eb1ng,<\/em> Phan<\/em> V\u0103n<\/em> Th<\/em>\u1eafng<\/em><\/td>\n

193<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

NGHI\u00caN C\u1ee8U K\u1ef8 THU\u1eacT NH\u00c2N GI\u1ed0NG C\u00c2Y \u0110\u1eb2NG S\u00c2M (Codonopsis javanica<\/em> (Blume) Hook.F & Thoms) PH\u00c2N B\u1ed0 T\u1ef0 NHI\u00caN T\u1ea0I S\u01a0N LA<\/strong><\/p>\n

Nguy\u1ec5n Th\u1ecb B\u00edch Ng\u1ecdc <\/strong><\/p>\n

Khoa N\u00f4ng L\u00e2m – Tr\u01b0\u1eddng \u0110\u1ea1i h\u1ecdc T\u00e2y B\u1eafc <\/em><\/p>\n

T\u00d3M T\u1eaeT<\/p>\n

\u0110\u1eb3ng s\u00e2m l\u00e0 d\u1ea1ng c\u00e2y d\u00e2y leo, c\u00f3 t\u00ean khoa h\u1ecdc l\u00e0 (Codonopsis javanica<\/em> (Blume) Hook.F & Thoms). \u0110\u1eb3ng s\u00e2m c\u00f3 gi\u00e1 tr\u1ecb d\u01b0\u1ee3c li\u1ec7u, kinh t\u1ebf cao v\u00e0 \u00fd ngh\u0129a b\u1ea3o t\u1ed3n l\u1edbn. Nghi\u00ean c\u1ee9u n\u00e0y \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n trong khu\u00f4n kh\u1ed5 \u0111\u1ec1 t\u00e0i nghi\u00ean c\u1ee9u khoa h\u1ecdc v\u00e0 ph\u00e1t tri\u1ec3n c\u00f4ng ngh\u1ec7 c\u1ee7a B\u1ed9 Gi\u00e1o d\u1ee5c v\u00e0 \u0110\u00e0o t\u1ea1o, m\u00e3 s\u1ed1 B2019 – TTB – 03 t\u1ea1i khu v\u1ef1c S\u01a1n La. Nghi\u00ean c\u1ee9u nh\u00e2n gi\u1ed1ng b\u1eb1ng h\u1ea1t \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n v\u1edbi 4 l\u00f4 h\u1ea1t t\u01b0\u01a1ng \u1ee9ng 3 \u0111i\u1ec3m thu h\u00e1i (huy\u1ec7n V\u00e2n H\u1ed3, huy\u1ec7n S\u00f4ng M\u00e3, huy\u1ec7n Thu\u1eadn Ch\u00e2u v\u00e0 h\u1ed7n h\u1ee3p 3 \u0111i\u1ec3m). K\u1ebft qu\u1ea3 cho th\u1ea5y qu\u1ea3 c\u00f3 \u0111\u01b0\u1eddng k\u00ednh t\u1eeb 1,2 – 1,3 cm, \u0111\u1ed9 thu\u1ea7n h\u1ea1t t\u1eeb 88,0 – 91,0%, kh\u1ed1i l\u01b0\u1ee3ng 1.000 h\u1ea1t trung b\u00ecnh l\u00e0 0,194g, c\u00f3 t\u1eeb 810 – 893 h\u1ea1t\/qu\u1ea3, t\u1eeb 5.076.142 – 5.208.333 h\u1ea1t\/ kg; t\u1ed1c \u0111\u1ed9 n\u1ea3y m\u1ea7m t\u1eeb 7,4 – 7,5 ng\u00e0y. T\u1ef7 l\u1ec7 n\u1ea3y m\u1ea7m kh\u00f4ng c\u00f3 s\u1ef1 kh\u00e1c bi\u1ec7t r\u00f5 r\u1ec7t gi\u1eefa c\u00e1c l\u00f4 h\u1ea1t v\u00e0 c\u00f3 th\u1ec3 g\u1ed9p m\u1eabu h\u1ea1t t\u1ea1i c\u00e1c l\u00f4 \u0111\u1ec3 nghi\u00ean c\u1ee9u. T\u1ef7 l\u1ec7 n\u1ea3y m\u1ea7m c\u1ee7a h\u1ea1t t\u1eeb 89,0 – 91,3%, x\u1eed l\u00fd h\u1ea1t \u1edf nhi\u1ec7t \u0111\u1ed9 t\u1ed1t nh\u1ea5t l\u00e0 40o C. Gi\u00e1 th\u1ec3 t\u1ed1t nh\u1ea5t cho gieo th\u1eb3ng h\u1ea1t \u0110\u1eb3ng s\u00e2m l\u00e0 70% \u0111\u1ea5t t\u1ea7ng m\u1eb7t + 20% tr\u1ea5u hun + 10% ph\u00e2n chu\u1ed3ng hoai m\u1ee5c. Nh\u00e2n gi\u1ed1ng b\u1eb1ng c\u1ee7 cho t\u1ef7 l\u1ec7 s\u1ed1ng t\u1eeb 87,8 – 91,1% v\u00e0 kh\u00f4ng c\u00f3 s\u1ef1 kh\u00e1c bi\u1ec7t gi\u1eefa c\u00e1c k\u00edch th\u01b0\u1edbc c\u1ee7 kh\u00e1c nhau. Sau 45 ng\u00e0y gi\u00e2m c\u1ee7, chi\u1ec1u d\u00e0i ch\u1ed3i c\u1ee7 t\u1eeb 8,9-11,5 cm, c\u1ee7 c\u00f3 k\u00edch th\u01b0\u1edbc t\u1eeb 1-1,5 cm cho sinh tr\u01b0\u1edfng ch\u1ed3i t\u1ed1t nh\u1ea5t. Nh\u00e2n gi\u1ed1ng b\u1eb1ng gi\u00e2m hom th\u00e2n kh\u00f4ng th\u1ef1c s\u1ef1 ph\u00f9 h\u1ee3p, t\u1ef7 l\u1ec7 s\u1ed1ng dao \u0111\u1ed9ng t\u1eeb 23,33 – 63,33%. Cao nh\u1ea5t t\u1ea1i th\u00ed nghi\u1ec7m thu\u1ed1c NAA n\u1ed3ng \u0111\u1ed9 400ppm v\u1edbi th\u1eddi gian nh\u00fang thu\u1ed1c 20s. Thu\u1ed1c IAA cho t\u1ef7 l\u1ec7 s\u1ed1ng th\u1ea5p nh\u1ea5t, ti\u1ebfp theo \u0111\u1ebfn IBA v\u00e0 cao nh\u1ea5t l\u00e0 NAA c\u1ea3 v\u1ec1 chi\u1ec1u d\u00e0i r\u1ec5 c\u1ee7a hom.<\/p>\n

T\u1eeb kh\u00f3a: \u0110\u1eb3ng s\u00e2m, nh\u00e2n gi\u1ed1ng t\u1eeb h\u1ea1t, gi\u00e2m hom th\u00e2n, nh\u00e2n gi\u1ed1ng b\u1eb1ng c\u1ee7, t\u1ec9nh S\u01a1n La.<\/p>\n

Quality testing quality seedsing and variation test (Codonopsis javanica<\/em> ((Blume) Hook.F&Thoms) natural distribution in Son La<\/strong><\/p>\n

Codonopsis javanica<\/em> (Blume) Hook.F & Thoms is a vine with medicinal value, high economic value and conservation significance. Research was carried out within the framework of the scientific research and technological development project at the ministerial level, the Ministry of Education and Training, code B2019 – TTB – 03 in Son La province. Seed propagation study was carried out with 4 seed plots corresponding to 3 collection points (Van Ho district, Song Ma district, Thuan Chau district and combined point 3). The results show that the fruit diameter is from 1.2 to 1.3 cm, the purity of the seeds is from 88.0 to 91.0%, the average weight of 1,000 seeds is 0.194g, there are from 810 to 893 seeds\/fruit. 5,076,142 – 5,208,333 seeds\/ kg; germination rate from 7.4 to 7.5 days. Germination rate did not differ significantly between the seed lots and seed samples could be combined in the plots for study. Seeds germinate from 89.0 – 91.3%, the best seed soaking temperature is 40o C. The best medium for direct sowing of Dang ginseng seeds is 70% topsoil + 20% charred rice husks + 10% rotting manure. Propagation by tubers gave survival rates from 87.8 to 91.1% and there was no difference between different tuber sizes. After 45 days, the length of the tubers was from 8.9-11.5 cm, the tubers were 1-1.5 cm size for the best shoot growth. Propagation by stem cuttings is not really suitable, the survival rate ranges from 23.33 to 63.33%. Highest is NAA drug experiment with 400ppm concentration with 20s drug immersion time. IAA gave the lowest survival rate, followed by IBA and the highest was NAA.<\/p>\n

Keywords: Codonopsis javanica<\/em> (Blume) Hook.F & Thoms, quality seedsing test, stem cuttings, propagated with tubers, Son La province.<\/p>\n

 <\/p>\n

\u0110\u1eb6C \u0110I\u1ec2M SINH TH\u00c1I V\u00c0 KY\u0303 THU\u00c2\u0323T NH\u00c2N GI\u1ed0NG LO\u00c0I THANH MAI (Myrica esculenta<\/em> Buch. – Ham. ex D. Don) B\u1eb0NG PH\u01af\u01a0NG PH\u00c1P NU\u00d4I C\u1ea4Y M\u00d4 T\u1ea0I L\u00c2M \u0110\u1ed2NG<\/strong><\/p>\n

Ph\u1ea1m Ng\u1ecdc Tu\u00e2n1*, L\u00ea C\u1ea3nh Nam2 , Nguy\u00ea\u0303n Thanh Nguy\u00ean2 , Phan Hoa\u0300ng \u0110a\u0323i 1 , Phan Xu\u00e2n Huy\u00ean3 , V\u00f5 Th\u1ecb Kim Nga1 , Mai \u0110\u01b0\u0301cB\u00ecnh1 , L\u01b0\u01a1ng V\u0103n D\u0169ng1 , Ho\u00e0ng T\u1ea5t D\u01b0\u01a1ng4 <\/strong><\/p>\n

1 Khoa N\u00f4ng L\u00e2m, Tr\u01b0\u1eddng \u0110\u1ea1i h\u1ecdc \u0110\u00e0 L\u1ea1t <\/em><\/p>\n

2 Vi\u1ec7n Khoa h\u1ecdc L\u00e2m nghi\u1ec7p Nam Trung B\u1ed9 v\u00e0 T\u00e2y Nguy\u00ean <\/em><\/p>\n

3 Vi\u1ec7n Nghi\u00ean c\u1ee9u Khoa h\u1ecdc T\u00e2y Nguy\u00ean, Vi\u1ec7n H\u00e0n l\u00e2m Khoa h\u1ecdc v\u00e0 C\u00f4ng ngh\u1ec7 Vi\u1ec7t Nam <\/em><\/p>\n

4 Quy\u0303 ba\u0309o v\u00ea\u0323 va\u0300 pha\u0301t tri\u00ea\u0309n r\u01b0\u0300ng L\u00e2m \u0110\u00f4\u0300ng<\/em><\/p>\n

T\u00d3M T\u1eaeT<\/p>\n

C\u00e2y Thanh mai (Myrica esculenta<\/em>) l\u00e0 m\u1ed9t lo\u00e0i c\u00e2y d\u01b0\u1ee3c li\u1ec7u c\u00f3 gi\u00e1 tr\u1ecb kinh t\u1ebf, \u0111\u01b0\u01a1\u0323c s\u1eed d\u1ee5ng v\u1edbi nhi\u1ec1u c\u00f4ng d\u1ee5ng kh\u00e1c nhau, thu\u1ed9c nh\u00f3m Actinorhizal plants \u0111a\u0303 \u0111\u01b0\u1ee3c ch\u1ee9ng minh l\u00e0 h\u1eefu \u00edch trong canh t\u00e1c tr\u00ean \u0111\u1ea5t thi\u1ebfu nit\u01a1. Nghi\u00ean c\u1ee9u v\u1ec1 c\u00e1c \u0111\u1eb7c \u0111i\u1ec3m ph\u00e2n b\u1ed1, l\u00e2m h\u1ecdc, sinh th\u00e1i, v\u00e0 nh\u00e2n gi\u1ed1ng b\u1eb1ng k\u1ef9 thu\u1eadt nu\u00f4i c\u1ea5y m\u00f4 s\u1ebd l\u00e0 c\u01a1 s\u1edf cho vi\u1ec7c ph\u00e1t tri\u1ec3n c\u00e1c m\u00f4 h\u00ecnh tr\u1ed3ng c\u00e2y Thanh mai d\u01b0\u1edbi t\u00e1n r\u1eebng th\u00f4ng t\u1ea1i L\u00e2m \u0110\u1ed3ng. T\u1ea1i L\u00e2m \u0110\u1ed3ng c\u00f3 2 ph\u00e2n lo\u00e0i\/th\u1ee9 Thanh mai v\u1edbi\/c\u00f3 v\u00f9ng ph\u00e2n b\u1ed1 v\u00e0 ki\u1ec3u ph\u00e2n b\u1ed1 kh\u00e1c nhau. \u0110\u1ed1i v\u1edbi lo\u00e0i Thanh mai qu\u1ea3 nh\u1ecf, c\u00f3 ph\u00e2n b\u1ed1 \u1edf \u0110\u01a1n D\u01b0\u01a1ng, \u0110\u1ee9c Tr\u1ecdng, L\u00e2m H\u00e0, \u0110am R\u00f4ng, \u0110\u00e0 L\u1ea1t v\u00e0 m\u1ed9t ph\u1ea7n huy\u1ec7n Di Linh, tham gia v\u00e0o c\u00f4ng th\u1ee9c t\u1ed5 th\u00e0nh c\u1ee7a nh\u1eefng lo\u00e0i c\u00f3 \u01b0u th\u1ebf sinh th\u00e1i (IV% > 3%), \u0111\u00e2y l\u00e0 lo\u00e0i c\u00e2y \u01b0a s\u00e1ng v\u00e0 ch\u1ecbu h\u1ea1n, h\u00e0m l\u01b0\u1ee3ng m\u00f9n trong \u0111\u1ea5t th\u1ea5p, pH th\u1ea5p (< 5,5). Ng\u01b0\u01a1\u0323c la\u0323i, \u0111\u1ed1i v\u1edbi lo\u00e0i Thanh mai qu\u1ea3 to c\u00f3 ph\u00e2n b\u1ed1 ch\u1ee7 y\u1ebfu \u1edf V\u01b0\u01a1\u0300n qu\u00f4\u0301c gia Bidoup – N\u00fai B\u00e0, trong ki\u1ec3u r\u1eebng l\u00e1 r\u1ed9ng th\u01b0\u1eddng xanh v\u00e0 ki\u1ec3u r\u1eebng h\u1ed7n giao c\u00e2y l\u00e1 r\u1ed9ng l\u00e1 kim, v\u1edbi ki\u1ec3u ph\u00e2n b\u1ed1 c\u1ee5m v\u1edbi s\u1ed1 l\u01b0\u1ee3ng c\u00e1 th\u1ec3 pha\u0301t tri\u00ea\u0309n tha\u0300nh c\u1ee5m nh\u1ecf (3-4 c\u00e1 th\u1ec3) kh\u1eafp khu v\u1ef1c, \u0111\u00e2y l\u00e0 lo\u00e0i c\u00e2y chi\u0323u b\u00f3ng, m\u1ecdc ven khe su\u1ed1i, h\u00e0m l\u01b0\u1ee3ng m\u00f9n trong \u0111\u1ea5t cao, pH trung b\u00ecnh (6-7). Nghi\u00ean c\u01b0\u0301u v\u00ea\u0300 nh\u00e2n gi\u00f4\u0301ng b\u0103\u0300ng ph\u01b0\u01a1ng pha\u0301p nh\u00e2n gi\u00f4\u0301ng in vitro, h\u1ea1t Thanh mai \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng l\u00e0m m\u1eabu c\u1ea5y ban \u0111\u00e2\u0300u \u0111\u1ec3 thi\u1ebft l\u1eadp c\u00e1c m\u1eabu ch\u1ed3i c\u1ea5y. S\u1ef1 ph\u00e1t tri\u1ec3n c\u1ee7a ch\u1ed3i Thanh mai tr\u00ean c\u00e1c m\u00f4i tr\u01b0\u1eddng dinh d\u01b0\u01a1\u0303ng b\u00f4\u0309 sung ca\u0301c ch\u00e2\u0301t \u0111i\u00ea\u0300u ho\u0300a sinh tr\u01b0\u01a1\u0309ng kh\u00e1c nhau: m\u00f4i tr\u01b0\u1eddng Murashige v\u00e0 Skoog (MS) v\u00e0 m\u00f4i tr\u01b0\u1eddng c\u00e2y th\u00e2n g\u1ed7 (WPM), 6- benzyladenine (BA) (0,5-1,5 mg\/l), \u03b1-naphthaleneaceticd (NAA) v\u00e0 indole-3-butyric acid (IBA) (0,5-1,5 mg\/l) \u0111\u01b0\u01a1\u0323c kha\u0309o sa\u0301t. Trong 9 tu\u1ea7n nu\u00f4i c\u1ea5y, kh\u00f4ng c\u00f3 s\u1ef1 kh\u00e1c bi\u1ec7t \u0111\u00e1ng k\u1ec3 gi\u1eefa hai m\u00f4i tr\u01b0\u1eddng WPM v\u00e0 m\u00f4i tr\u01b0\u1eddng MS. Tuy nhi\u00ean, c\u00e1c \u0111o\u1ea1n th\u00e2n v\u00e0 l\u00e1 c\u1ee7a m\u1eabu ch\u00f4\u0300i Thanh mai trong m\u00f4i tr\u01b0\u1eddng WPM l\u1edbn, th\u1eb3ng v\u00e0 kh\u1ecfe h\u01a1n so v\u1edbi trong m\u00f4i tr\u01b0\u1eddng MS. N\u1ed3ng \u0111\u1ed9 BA t\u1ed1t nh\u1ea5t cho m\u1eabu Thanh mai in vitro l\u00e0 0,5 mg\/l BA. N\u1ed3ng \u0111\u1ed9 NAA t\u1ed1i \u01b0u trong m\u00f4i tr\u01b0\u1eddng t\u1ea1o r\u1ec5 in vitro l\u00e0 0,5 mg\/l NAA sau 7 tu\u1ea7n (90%). Vi\u1ec7c thu\u00e2\u0300n ho\u0301a c\u00e2y con co\u0301 ngu\u00f4\u0300n g\u00f4\u0301c in vitro r\u1ea5t kh\u00f3 kh\u0103n do ty\u0309 l\u00ea\u0323 ch\u00ea\u0301t c\u1ee7a c\u00e2y con kha\u0301 cao v\u00ec s\u1ef1 xu\u1ea5t hi\u1ec7n c\u1ee7a n\u00e2\u0301m b\u1ec7nh do \u0111\u1ed9 \u1ea9m cao trong nh\u00e0 k\u00ednh. Tuy nhi\u00ean, 70-75% c\u00e2y Thanh mai con \u0111\u01b0\u1ee3c nh\u00e2n gi\u00f4\u0301ng th\u00e0nh c\u00f4ng trong nh\u00e0 k\u00ednh v\u00e0 k\u1ebft qu\u1ea3 c\u0169ng ch\u1ec9 ra r\u1eb1ng m\u00f4i tr\u01b0\u1eddng h\u1ed7n h\u1ee3p gi\u1eefa 50% \u0111\u1ea5t x\u01a1 d\u1eeba + 50% Perlite phu\u0300 h\u01a1\u0323p h\u01a1n so v\u01a1\u0301i c\u00e1c nghi\u1ec7m th\u1ee9c kh\u00e1c<\/p>\n

T\u1eeb kh\u00f3a: Thanh mai in vitro, m\u00f4i tr\u01b0\u01a1\u0300ng WPM, Thanh mai L\u00e2m \u0110\u00f4\u0300ng, sinh tha\u0301i c\u00e2y Thanh mai.<\/p>\n

Characterization of ecology and micropropagation of the Myrica esculenta<\/em> Buch. – Ham. Ex D. don species in Lam Dong province<\/strong><\/p>\n

Myrica esculenta<\/em>, a medicinal plant belonging to the group of Actinorhizal plants with different uses, is proved to be useful in farming on nitrogen-depleted soils. The study of the distributive, silvicultural and ecological characteristics, and micropropagation methods will be the basis for building a model of growing Thanh mai tree under the canopy of Pine forests in Lam Dong province. The M. esculenta in Lam Dong has different distribution areas and patterns; These small fruit species, grown in Don Duong, Duc Trong, Lam Ha, Dam Rong, Da Lat and a part of Di Linh district, pertain to composition of species that are significant to the forest floor, this is a light-loving and drought tolerant plant, with low humus soils, low pH (< 5.5). By contrast, the large fruit species distributed mainly in Bidoup – Nui Ba National Park, pattern were scattered throughout the area, most of the individuals in small clusters (2-3 individuals) were shade tolerant plants, growing along streams, with high humus soils, pH average (6-7). In Micropropagation of Myrica esculenta, the mature nuts of M. esculenta were used as primary explants for establishing shoot cultures. The growth of M. esculenta shoot cultures was compared on media differing in nutrient formulation, Murashige and Skoog (MS) medium and Woody plant medium (WPM), concentrations of 6- benzyladenine (BA) (0.5-1.5 mg\/l), \u03b1-naphthaleneaceticd (NAA) and indole-3-butyric acid (IBA) concentration (0.5-1.5 mg\/l). During the 9 weeks culture passage there was no significant difference among two media, the WPM medium and MS medium. However, the stem and leaf segments of the sample M. esculenta in WPM medium were larger, straighter and stronger than those of MS medium. The best BA concentration for M. esculenta explants was 0.5 mg\/l BA. The optimal NAA concentration in the induction medium for rooting of microcuttings was 0.5 mg\/l NAA applied for 7 weeks in root media. The acclimatization of rooted microcuttings was difficult because the tendency to dessicate of plantlets and because of the occurrence of diseases due to high humidity in the greenhouse. Nevertheless, 70-75% of the M. esculenta plantlets were successfully established in the greenhouse and the results also indicated that the mixed medium between 50% coir soil + 50% Perlite was better growth than the other treatments.<\/p>\n

Keywords: Myrica esculenta<\/em> in vitro, WPM medium, Myrica esculenta<\/em> Lam Dong, Myrica esculenta<\/em>\u2019s ecology.<\/p>\n

NGHI\u00caN C\u1ee8U NH\u00c2N GI\u1ed0NG D\u1eba \u0110\u1ece (Lithocarpus ducampii<\/em> (Hickel & A. Camus) A. Camus) T\u1eea H\u1ea0T B\u1eb0NG B\u1ea6U T\u1ef0 H\u1ee6Y SINH H\u1eccC TRONG GIAI \u0110O\u1ea0N V\u01af\u1edcN \u01af\u01a0M<\/strong><\/p>\n

Nguy\u1ec5n V\u0103n Th\u1ecd, Nguy\u1ec5n Th\u1ecb \u00c1nh Nguy\u1ec7t, Ph\u1ea1m Quang T\u00fa, Nguy\u1ec5n Ph\u01b0\u01a1ng Th\u1ea3o <\/strong><\/p>\n

Trung t\u00e2m Khoa h\u1ecdc L\u00e2m nghi\u1ec7p v\u00f9ng Trung t\u00e2m B\u1eafc B\u1ed9<\/em><\/p>\n

T\u00d3M T\u1eaeT<\/p>\n

D\u1ebb \u0111\u1ecf l\u00e0 c\u00e2y l\u00e1 r\u1ed9ng b\u1ea3n \u0111\u1ecba th\u01b0\u1eddng xanh, th\u00e2n th\u1eb3ng, sinh tr\u01b0\u1edfng nhanh, ti\u1ec1m n\u0103ng l\u1edbn tr\u1ed3ng r\u1eebng g\u1ed7 l\u1edbn. Tuy nhi\u00ean, \u0111\u1ebfn nay v\u1eabn nh\u00e2n gi\u1ed1ng b\u1eb1ng b\u1ea7u nilon v\u1edbi h\u1ed7n h\u1ee3p ru\u1ed9t b\u1ea7u l\u00e0 \u0111\u1ea5t t\u1ea7ng m\u1eb7t, n\u1eb7ng khi v\u1eadn chuy\u1ec3n v\u00e0 v\u1ecf b\u1ea7u g\u00e2y \u00f4 nhi\u1ec5m m\u00f4i tr\u01b0\u1eddng n\u00ean c\u1ea7n thi\u1ebft nghi\u00ean c\u1ee9u nh\u00e2n gi\u1ed1ng b\u1eb1ng b\u1ea7u t\u1ef1 h\u1ee7y sinh h\u1ecdc nh\u1eb1m gi\u1ea3m chi ph\u00ed v\u1eadn chuy\u1ec3n v\u00e0 g\u00f3p ph\u1ea7n b\u1ea3o v\u1ec7 m\u00f4i tr\u01b0\u1eddng. K\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u cho th\u1ea5y: H\u1ea1t D\u1ebb \u0111\u1ecf to d\u1ec5 n\u1ea3y m\u1ea7m, t\u1ef7 l\u1ec7 n\u1ea3y m\u1ea7m \u0111\u1ea1t 85,2% khi \u1ee7 v\u1edbi c\u00e1t \u1ea9m. Ch\u1ea5t l\u01b0\u1ee3ng b\u1ed9 r\u1ec5 c\u00e2y con D\u1ebb \u0111\u1ecf \u1edf b\u1ea7u t\u1ef1 h\u1ee7y sinh h\u1ecdc t\u1ed1t h\u01a1n \u1edf b\u1ea7u nilon v\u1edbi h\u1ed7n h\u1ee3p ru\u1ed9t b\u1ea7u l\u00e0 \u0111\u1ea5t t\u1ea7ng m\u1eb7t. B\u1ed9 r\u1ec5 ph\u00e1t tri\u1ec3n t\u1ed1t nh\u1ea5t \u1edf b\u1ea7u t\u1ef1 h\u1ee7y sinh h\u1ecdc v\u1edbi h\u1ed7n h\u1ee3p ru\u1ed9t b\u1ea7u g\u1ed3m 65% than b\u00f9n + 30% tr\u1ea5u + 5% ph\u00e2n b\u00f2 kh\u00f4 (CT2) v\u00e0 b\u1ea7u t\u1ef1 h\u1ee7y sinh h\u1ecdc v\u1edbi h\u1ed7n h\u1ee3p ru\u1ed9t b\u1ea7u g\u1ed3m 55% b\u1ed9t v\u1ecf c\u00e2y keo + 25% m\u00f9n + 15% than c\u1ee7i + 5% ph\u00e2n b\u00f2 kh\u00f4 (CT4). Sinh tr\u01b0\u1edfng \u0111\u01b0\u1eddng k\u00ednh v\u00e0 chi\u1ec1u cao t\u1ed1t nh\u1ea5t \u1edf CT2, CT4 v\u00e0 b\u1ea7u nilon v\u1edbi h\u1ed7n h\u1ee3p ru\u1ed9t b\u1ea7u l\u00e0 t\u1ea7ng \u0111\u1ea5t m\u1eb7t + 1% ph\u00e2n NPK 5:10:3 (CT1). Tr\u1ecdng l\u01b0\u1ee3ng c\u00e2y con 9 th\u00e1ng tu\u1ed5i trong b\u1ea7u t\u1ef1 h\u1ee7y sinh h\u1ecdc (bao g\u1ed3m c\u1ea3 c\u00e2y con v\u00e0 b\u1ea7u) ch\u1ec9 b\u1eb1ng 0,31-0,56 l\u1ea7n c\u00e2y con trong b\u1ea7u nilon v\u1edbi h\u1ed7n h\u1ee3p ru\u1ed9t b\u1ea7u l\u00e0 t\u1ea7ng \u0111\u1ea5t m\u1eb7t nh\u01b0ng gi\u00e1 th\u00e0nh cao h\u01a1n t\u1eeb 1,08- 1,41 l\u1ea7n. B\u1ea7u t\u1ef1 h\u1ee7y sinh h\u1ecdc v\u1edbi h\u1ed7n h\u1ee3p ru\u1ed9t b\u1ea7u g\u1ed3m 55% b\u1ed9t v\u1ecf c\u00e2y keo + 25% m\u00f9n + 15% than c\u1ee7i + 5% ph\u00e2n b\u00f2 kh\u00f4 l\u00e0 th\u00edch h\u1ee3p nh\u1ea5t c\u1ea3 v\u1ec1 ph\u00e1t tri\u1ec3n b\u1ed9 r\u1ec5, sinh tr\u01b0\u1edfng, tr\u1ecdng l\u01b0\u1ee3ng v\u00e0 gi\u00e1 th\u00e0nh xu\u1ea5t c\u00e2y gi\u1ed1ng D\u1ebb \u0111\u1ecf.<\/p>\n

T\u1eeb kh\u00f3a: D\u1ebb \u0111\u1ecf, nh\u00e2n gi\u1ed1ng, b\u1ea7u t\u1ef1 h\u1ee7y sinh h\u1ecdc<\/p>\n

Research on propagation of Lithocarpus\u00a0ducampii<\/em>\u00a0(Hickel & A. Camus) A. Camus) from seed by using biodegradable non-woven nursery bag at the nursery stage<\/strong><\/p>\n

Lithocarpus ducampii<\/em> is a native evergreen broadleaf tree with straight trunk, growing fast and great potential for planting large size timber plantation. However, up to now, seedlings of this species are still propagated by black plastic bags with topsoil as potting mix. The plastic bags with topsoil was heavy when transporting and causes environmental pollution, so it is necessary to propagate by biodegradable non-woven nursery bags to reduce transportation cost and contribute to environmental protection. The results of the study showed that: Seeds of L. ducampii<\/em> are big and easy to germinate, the germination rate is 85.2% when incubated with moist sand. Root quality of L. ducampii<\/em> seedlings in biodegradable non-woven nursery bags was better than in black plastic bags with topsoil. The best growing root system in pot substrate consisting of 65% peat + 30% rice husk + 5% dried cow dung (CT2) and pot substrate comprising 55% acacia bark powder + 25% sawdust + 15% charcoal + 5% dried cow dung (CT4). The best growth in diameter and height in CT2, CT4 and black plastic with pot substrate including topsoil + 1% NPK 5:10:3 fertilizer (CT1). The weight of 9 months old seedlings in biodegradable non-woven nursery bags is only 0.31-0.56 times of the seedings in black plastic bags with topsoil, but the cost is 1.08-1.41 times higher. Biodegradable non-woven nursery bags with pot substrate consisting of 55% acacia bark powder + 25% sawdust + 15% charcoal + 5% dry cow dung is the most suitable in terms of root development, growth, weight and cost of the seedling to produce seedling of L. ducampii.<\/p>\n

Keyword: Lithocarpus ducampii<\/em>, propagation, organic bag<\/p>\n

 <\/p>\n

KH\u1ea2 N\u0102NG RA R\u1ec4 V\u00c0 CH\u1ed2I C\u1ee6A C\u00c2Y HOM DUM V\u00c0NG (Rubus ellipticus<\/em> var. obcordatus) TRONG NH\u00c0 K\u00cdNH T\u1ea0I L\u00c2M \u0110\u1ed2NG, VI\u1ec6T NAM<\/strong><\/p>\n

Ho\u00e0ng Thanh Tr\u01b0\u1eddng, L\u00ea Th\u1ecb Thu\u00fd H\u00f2a, B\u00f9i V\u0103n Tr\u1ecdng, Nguy\u1ec5n L\u00ea Uy\u1ec3n Nh\u01b0, Nguy\u1ec5n Th\u00e0nh M\u1ebfn<\/strong><\/p>\n

\u00a0Vi\u1ec7n Khoa h\u1ecdc L\u00e2m nghi\u1ec7p Nam Trung B\u1ed9 v\u00e0 T\u00e2y Nguy\u00ean<\/em><\/p>\n

T\u00d3M T\u1eaeT<\/p>\n

Nghi\u00ean c\u1ee9u kh\u1ea3 n\u0103ng nh\u00e2n gi\u1ed1ng c\u1ee7a c\u00e2y Dum v\u00e0ng (Rubus ellipticus<\/em> var. obcordatus) b\u1eb1ng ph\u01b0\u01a1ng ph\u00e1p gi\u00e2m hom nh\u1eb1m t\u00ecm ra lo\u1ea1i thu\u1ed1c v\u00e0 n\u1ed3ng \u0111\u1ed9 ch\u1ea5t \u0111i\u1ec1u h\u00f2a sinh tr\u01b0\u1edfng th\u00edch h\u1ee3p cho c\u00e2y Dum v\u00e0ng. Nghi\u00ean c\u1ee9u n\u00e0y kh\u1ea3o s\u00e1t \u1ea3nh h\u01b0\u1edfng c\u1ee7a c\u00e1c ch\u1ea5t \u0111i\u1ec1u h\u00f2a sinh tr\u01b0\u1edfng th\u1ef1c v\u1eadt IAA v\u00e0 NAA d\u1ea1ng b\u1ed9t v\u1edbi c\u00e1c h\u00e0m l\u01b0\u1ee3ng 0,5%; 1%; 1,5%; 2% t\u1edbi kh\u1ea3 n\u0103ng ra r\u1ec5 c\u1ee7a hom c\u00e2y Dum v\u00e0ng, \u0111\u1ed1i ch\u1ee9ng l\u00e0 c\u00f4ng th\u1ee9c kh\u00f4ng s\u1eed d\u1ee5ng ch\u1ea5t \u0111i\u1ec1u h\u00f2a sinh tr\u01b0\u1edfng. K\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u ghi nh\u1eadn c\u00e1c c\u00f4ng th\u1ee9c \u1ed5n \u0111\u1ecbnh nh\u1ea5t bao g\u1ed3m: IAA n\u1ed3ng \u0111\u1ed9 0,5% cho t\u1ef7 l\u1ec7 ra r\u1ec5 \u0111\u1ea1t 70,00% v\u1edbi 17,19 r\u1ec5\/hom v\u00e0 chi\u1ec1u d\u00e0i r\u1ec5 8,46 cm\/hom; NAA n\u1ed3ng \u0111\u1ed9 1,5% cho t\u1ef7 l\u1ec7 ra r\u1ec5 \u0111\u1ea1t 70,00% v\u1edbi 19,33 r\u1ec5\/hom v\u00e0 chi\u1ec1u d\u00e0i r\u1ec5 8,70 cm\/hom; NAA n\u1ed3ng \u0111\u1ed9 2% cho t\u1ef7 l\u1ec7 ra r\u1ec5 \u0111\u1ea1t 73,33% v\u1edbi s\u1ed1 r\u1ec5 14,45 r\u1ec5\/hom v\u00e0 chi\u1ec1u d\u00e0i r\u1ec5 9,78 cm\/hom. T\u1eeb \u0111\u00f3, ch\u1ea5t \u0111i\u1ec1u h\u00f2a sinh tr\u01b0\u1edfng v\u00e0 n\u1ed3ng \u0111\u1ed9 IAA \u0111\u01b0\u1ee3c khuy\u1ebfn ngh\u1ecb s\u1eed d\u1ee5ng l\u00e0 IAA 0,5%. \u0110\u1ed1i v\u1edbi NAA th\u00ec c\u00f3 th\u1ec3 b\u1ed5 sung t\u1eeb 05 \u0111\u1ebfn 2% \u0111\u1ec1u cho k\u1ebft qu\u1ea3 ra r\u1ec5 t\u1ed1t, kho\u1ea3ng 60-70%.<\/p>\n

Rooting ability of stem cuttings on Rubus ellipticus<\/em> var. obcordatus in a greenhouse at Lam Dong province, Vietnam<\/strong><\/p>\n

Research on cutting propagation of Rubus ellipticus<\/em> var. obcordatus by cuttings method to find the auxins and their suitable concentration . This study evaluated the effects of plant growth regulators IAA and NAA with different contents (0.5%; 1%;1.5%; 2%) on rooting of Rubus ellipticus <\/em>var. Obcordatus. The research results showed that using IAA 0.5% for rooting rate reached to 70.00%, the roots number\/cutting was 17.19 roots and the root length\/cutting was 8.46 cm; using NAA 1.5% for rooting rate reached to 70.00%, the roots number\/cutting was 19.33 roots and the root length\/cutting was 8.70 cm; using NAA 2% for rooting rate reached to 73.33%, the roots number\/cuttings was 14.45 roots and the root length\/cuttings was 9.8 cm. Rooting ability is strongly influenced by the growth regulators content. The recommended suitable contents for cutting propagation were IAA (0.5%) and NAA were 0.5 to 2% with rooting rate about 60 – 70%.<\/p>\n

Keywords: Growt chemical substance, Rubus ellipticus<\/em> var. obcordatus, cutting propagation<\/p>\n

\u1ea2NH H\u01af\u1edeNG C\u1ee6A M\u1eacT \u0110\u1ed8 TR\u1ed2NG V\u00c0 PH\u00c2N B\u00d3N \u0110\u1ebeN SINH TR\u01af\u1edeNG C\u1ee6A R\u1eeaNG TR\u1ed2NG KEO, B\u1ea0CH \u0110\u00c0N TR\u00caN B\u1edc BAO T\u1ea0I HUY\u1ec6N H\u00d2N \u0110\u1ea4T, T\u1ec8NH KI\u00caN GIANG<\/strong><\/p>\n

Ki\u1ec1u Tu\u1ea5n \u0110\u1ea1t, Nguy\u1ec5n Tr\u1ecdng Nam, Ng\u00f4 V\u0103n Ng\u1ecdc, Phan Th\u1ecb M\u1ef5 Lan <\/strong><\/p>\n

Vi\u1ec7n Khoa h\u1ecdc L\u00e2m nghi\u1ec7p Nam B\u1ed9<\/em><\/p>\n

T\u00d3M T\u1eaeT<\/p>\n

Nghi\u00ean c\u1ee9u \u1ea3nh h\u01b0\u1edfng c\u1ee7a m\u1eadt \u0111\u1ed9 tr\u1ed3ng r\u1eebng v\u00e0 ph\u00e2n b\u00f3n \u0111\u1ebfn sinh tr\u01b0\u1edfng v\u00e0 n\u0103ng su\u1ea5t c\u1ee7a r\u1eebng tr\u1ed3ng keo lai, Keo l\u00e1 tr\u00e0m v\u00e0 b\u1ea1ch \u0111\u00e0n lai tr\u00ean b\u1edd bao t\u1ea1i huy\u1ec7n H\u00f2n \u0110\u1ea5t, t\u1ec9nh Ki\u00ean Giang, \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n t\u1eeb 2016-2020. Nghi\u00ean c\u1ee9u \u0111\u00e3 \u0111\u00e1nh gi\u00e1 l\u1eadp \u0111\u1ecba v\u00e0 t\u00ednh ch\u1ea5t \u0111\u1ea5t \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n tr\u01b0\u1edbc khi b\u1ed1 tr\u00ed th\u00ed nghi\u1ec7m. C\u00e1c th\u00ed nghi\u1ec7m \u0111\u01b0\u1ee3c b\u1ed1 tr\u00ed theo kh\u1ed1i ng\u1eabu nhi\u00ean \u0111\u1ea7y \u0111\u1ee7, 3 l\u1ea7n l\u1eb7p l\u1ea1i, m\u1ed7i \u00f4 th\u00ed nghi\u1ec7m 300 m2 , g\u1ed3m 4 c\u00f4ng th\u1ee9c v\u1ec1 m\u1eadt \u0111\u1ed9 tr\u1ed3ng v\u00e0 5 c\u00f4ng th\u1ee9c b\u00f3n ph\u00e2n. K\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u \u0111\u00e3 ch\u1ec9 ra r\u1eb1ng: (i) \u0110\u1ea5t \u0111ai khu v\u1ef1c nghi\u00ean c\u1ee9u l\u00e0 \u0111\u1ea5t ph\u00e8n m\u1ea1nh c\u00f3 pH th\u1ea5p, l\u01b0\u1ee3ng \u0111\u1ed9c t\u1ed1 s\u1eaft v\u00e0 nh\u00f4m \u1edf m\u1ee9c cao, \u0111\u1ea5t c\u00f3 t\u1ea7ng sinh ph\u00e8n n\u00f4ng n\u00ean vi\u1ec7c \u0111\u00e0o k\u00eanh l\u00ean l\u00edp tr\u1ed3ng r\u1eebng c\u1ea7n h\u1ea1n ch\u1ebf \u0111\u00e0o b\u1edbi \u0111\u1ebfn t\u1ea7ng ph\u00e8n ti\u1ec1m t\u00e0ng l\u00e0m \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn sinh tr\u01b0\u1edfng c\u1ee7a r\u1eebng v\u00e0 t\u00e1c \u0111\u1ed9ng x\u1ea5u \u0111\u1ebfn m\u00f4i tr\u01b0\u1eddng; (ii) M\u1eadt \u0111\u1ed9 tr\u1ed3ng r\u1eebng kh\u00f4ng \u1ea3nh h\u01b0\u1edfng r\u00f5 r\u1ec7t \u0111\u1ebfn t\u1ef7 l\u1ec7 s\u1ed1ng nh\u01b0ng \u1ea3nh h\u01b0\u1edfng l\u1edbn \u0111\u1ebfn sinh tr\u01b0\u1edfng v\u00e0 n\u0103ng su\u1ea5t c\u1ee7a r\u1eebng tr\u1ed3ng keo lai, Keo l\u00e1 tr\u00e0m v\u00e0 b\u1ea1ch \u0111\u00e0n lai. M\u1eadt \u0111\u1ed9 tr\u1ed3ng r\u1eebng th\u00edch h\u1ee3p tr\u00ean b\u1edd bao l\u00e0 2.000 – 3.333 c\u00e2y\/ha cho n\u0103ng su\u1ea5t r\u1eebng \u0111\u1ea1t t\u1eeb 28,4 – 33,8 m3 \/ha\/n\u0103m \u0111\u1ed1i v\u1edbi Keo l\u00e1 tr\u00e0m; t\u1eeb 38,0 – 47,0 m3 \/ha\/n\u0103m \u0111\u1ed1i v\u1edbi keo lai v\u00e0 t\u1eeb 37,3 – 44,1 m3 \/ha\/n\u0103m \u0111\u1ed1i v\u1edbi b\u1ea1ch \u0111\u00e0n lai sau 4,5 tu\u1ed5i; (iii) B\u00f3n l\u00f3t ph\u00e2n l\u00e2n v\u00e0 NPK c\u00f3 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn t\u1ef7 l\u1ec7 s\u1ed1ng v\u00e0 sinh tr\u01b0\u1edfng khi r\u1eebng c\u00f2n non. \u0110\u1ed1i \u0111\u1ed1i v\u1edbi keo lai v\u00e0 Keo l\u00e1 tr\u00e0m ch\u01b0a c\u00f3 \u1ea3nh h\u01b0\u1edfng r\u00f5 r\u1ec7t, nh\u01b0ng c\u00f3 \u1ea3nh h\u01b0\u1edfng r\u1ea5t r\u00f5 r\u1ec7t \u0111\u1ebfn sinh tr\u01b0\u1edfng v\u00e0 n\u0103ng su\u1ea5t r\u1eebng tr\u1ed3ng b\u1ea1ch \u0111\u00e0n lai. Tr\u1ed3ng r\u1eebng keo tr\u00ean b\u1edd bao n\u00ean b\u00f3n 100 – 200 g l\u00e2n\/c\u00e2y v\u00e0 tr\u1ed3ng b\u1ea1ch \u0111\u00e0n lai n\u00ean b\u00f3n l\u00f3t 100 – 200 g l\u00e2n + 100 g NPK\/c\u00e2y; (iv) Khi tr\u1ed3ng r\u1eebng keo, b\u1ea1ch \u0111\u00e0n t\u1ea1i v\u00f9ng \u0111\u1ea5t ng\u1eadp ph\u00e8n \u1edf huy\u1ec7n H\u00f2n \u0110\u1ea5t, t\u1ec9nh Ki\u00ean Giang v\u00e0 nh\u1eefng n\u01a1i c\u00f3 \u0111i\u1ec1u ki\u1ec7n l\u1eadp \u0111\u1ecba t\u01b0\u01a1ng t\u1ef1 ph\u1ea3i tr\u1ed3ng tr\u00ean l\u00edp cao v\u00e0 b\u1edd bao kh\u00f4ng b\u1ecb ng\u1eadp l\u0169, s\u1eed d\u1ee5ng c\u00e1c gi\u1ed1ng m\u1edbi l\u00e0 gi\u1ed1ng ti\u1ebfn b\u1ed9 k\u1ef9 thu\u1eadt, m\u1eadt \u0111\u1ed9 tr\u1ed3ng r\u1eebng v\u00e0 b\u00f3n l\u00f3t ph\u00e2n h\u1ee3p l\u00fd t\u1eeb k\u1ebft qu\u1ea3 c\u1ee7a nghi\u00ean c\u1ee9u n\u00e0y s\u1ebd mang l\u1ea1i hi\u1ec7u qu\u1ea3 cao cho ng\u01b0\u1eddi tr\u1ed3ng r\u1eebng<\/p>\n

T\u1eeb kh\u00f3a: Keo lai, Keo l\u00e1 tr\u00e0m, b\u1ea1ch \u0111\u00e0n lai, chi\u1ec1u cao l\u00edp, sinh tr\u01b0\u1edfng<\/p>\n

Research on tree growth of acacia and Eucalyptus plantation on embankment at Hon Dat district, Kien Giang province<\/strong><\/p>\n

Research on the effect of planting density and fertilizer on growth and productivity of acacia hybrid, Acacia auriculiformis<\/em> and eucalyptus hybrid planted on the embankment in Hon Dat district, Kien Giang province, conducted from 2016 – 2020. The study was evaluate the characteristics of soil condition befor establish experiments. The experiments design full randomized block, with 3 replicates, including 4 planting density levels and 5 fertilizer treatments, area of each experimental plot 300 m2 . The research results have shown that: (i) The soil in the study area is strongly acid sulphate soil with low pH, high levels of iron and aluminum toxins, low pirite level, so the excavation of canals to make embankment for plantations have to limit digging to the pirite layer, which has the potential to affect the growth of the plantation and adversely affect the environment; (ii) Planting density did not significantly affect survival rate, but had a great influence on growth and productivity of A. hybrid, A. auriculiformis<\/em> and E. hybrid plantations. The appropriate density of afforestation on the embankment is 2,000 – 3,333 trees\/ha for MAI get 28.4 – 33.8 m3 \/ha\/year for A. auriculiformis<\/em>; from 38.0 – 47.0 m3 \/ha\/year for A. hybrid and from 37.3 – 44.1 m3 \/ha\/year for E. hybrid after 4.5 years old; (iii) Phosphate and NPK fertilisers have an effect on survival and growth of young plantation. For A. hybrid and A. auriculiformis<\/em>, there is no obvious effect, but there is a very clear effect on growth and productivity of E. hybrid plantations. Planting acacia on the embankment should apply fertilize 100- 200 g phosphate\/tree and planting E. hybrid should apply fertilize 100-200 g phosphorus + 100 g NPK\/tree; (iv) Proposing the application of afforestation techniques of acacia, eucalyptus on acid sulfate soil in Hon Dat district, Kien Giang province and other places with similar site conditions, must be planted on high beds and embankments with-out flooding, using new clones that are technically advanced, planting density and reasonable fertilizing from the results of this study will bring high benefit to forest growers.<\/p>\n

Keywords: A. hybrid, A. auriculiformis<\/em>, E. hybrid, tree growth, embankment<\/p>\n

 <\/p>\n

NGHI\u00caN C\u1ee8U \u1ea2NH H\u01af\u1edeNG C\u1ee6A PH\u00c2N B\u00d3N \u0110\u1ebeN SINH KH\u1ed0I R\u1ec4 C\u00c1M R\u1eeaNG TR\u1ed2NG KEO TAI T\u01af\u1ee2NG (Acacia mangium<\/em> Willd) T\u1ea0I QU\u1ea2NG NINH<\/strong><\/p>\n

Nguy\u1ec5n To\u00e0n Th\u1eafng1 , Tr\u1ea7n V\u0103n \u0110\u00f41 , V\u0169 Ti\u1ebfn L\u00e2m1 , Ph\u00f9ng \u0110\u00ecnh Trung2 , Nguy\u1ec5n H\u1eefu Th\u1ecbnh1 , Tr\u1ea7n Ho\u00e0ng Qu\u00fd1 , \u0110\u00e0o Trung \u0110\u1ee9c1 , Nguy\u1ec5n Tr\u1ecdng Minh3 , V\u00f5 \u0110\u1ea1i Nguy\u00ean1 <\/strong><\/p>\n

1 Vi\u1ec7n Nghi\u00ean c\u1ee9u L\u00e2m sinh<\/em><\/p>\n

\u00a02 C\u00f4ng ty TNHH T\u01b0 v\u1ea5n & Ph\u00e1t tri\u1ec3n \u0110\u1ed3ng Xanh <\/em><\/p>\n

3 Tr\u01b0\u1eddng \u0110\u1ea1i h\u1ecdc L\u00e2m nghi\u1ec7p<\/em><\/p>\n

T\u00d3M T\u1eaeT<\/p>\n

R\u1ec5 c\u00e2y r\u1eebng c\u00f3 \u0111\u01b0\u1eddng k\u00ednh \u2264 2 mm \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 r\u1ec5 c\u00e1m, c\u00f3 vai tr\u00f2 h\u00fat n\u01b0\u1edbc v\u00e0 ch\u1ea5t dinh d\u01b0\u1ee1ng cung c\u1ea5p cho c\u00e2y. R\u1ec5 c\u00e1m \u0111\u00f3ng vai tr\u00f2 quan tr\u1ecdng \u0111\u1ed1i v\u1edbi chu tr\u00ecnh carbon v\u00e0 dinh d\u01b0\u1ee1ng trong h\u1ec7 sinh th\u00e1i r\u1eebng. K\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u r\u1eebng tr\u1ed3ng Keo tai t\u01b0\u1ee3ng 2 n\u0103m tu\u1ed5i t\u1ea1i Qu\u1ea3ng Ninh cho th\u1ea5y, ph\u00e2n b\u00f3n l\u00e0m t\u0103ng t\u1ed5ng sinh kh\u1ed1i s\u1ea3n sinh c\u1ee7a r\u1ec5 c\u00e1m, tuy nhi\u00ean, ch\u01b0a c\u00f3 \u1ea3nh h\u01b0\u1edfng r\u00f5 r\u1ec7t \u0111\u1ebfn t\u1ef7 l\u1ec7 ph\u00e2n h\u1ee7y c\u1ee7a r\u1ebd c\u00e1m ch\u1ebft. T\u1ed5ng sinh kh\u1ed1i r\u1ec5 c\u00e1m s\u1ea3n sinh t\u1ea1i c\u00f4ng th\u1ee9c \u0111\u1ed1i ch\u1ee9ng (\u0110C\/kh\u00f4ng b\u00f3n ph\u00e2n) \u0111\u1ea1t 707,86 (g\/m2 .n\u0103m), t\u0103ng l\u00ean 972,86 (g\/m2 .n\u0103m) t\u1ea1i c\u00f4ng th\u1ee9c b\u00f3n 400 g P2O5 (16,5%) + 100 g K2O (60%)\/c\u00e2y (CT400) v\u00e0 1.252,88 (g\/m2 .n\u0103m) t\u1ea1i c\u00f4ng th\u1ee9c b\u00f3n 600 g P2O5 + 100 g K2O\/c\u00e2y (CT600). Trong m\u00f9a sinh tr\u01b0\u1edfng c\u1ee7a Keo tai t\u01b0\u1ee3ng khu v\u1ef1c nghi\u00ean c\u1ee9u t\u1ea1i Qu\u1ea3ng Ninh, sinh kh\u1ed1i s\u1ea3n sinh r\u1ec5 c\u00e1m \u0111\u1ea1t 60,2% t\u1ed5ng sinh kh\u1ed1i c\u1ea3 n\u0103m t\u1ea1i \u0110C, 61,9% t\u1ea1i CT400 v\u00e0 CT600 ch\u1ec9 \u0111\u1ea1t 52,4%. K\u1ebft qu\u1ea3 cho th\u1ea5y b\u00f3n ph\u00e2n \u0111\u00f3ng vai tr\u00f2 quan tr\u1ecdng \u0111\u1ebfn chu tr\u00ecnh carbon r\u1eebng tr\u1ed3ng, t\u0103ng kh\u1ea3 n\u0103ng h\u1ea5p th\u1ee5 carbon trong \u0111\u1ea5t c\u1ee7a r\u1eebng tr\u1ed3ng, g\u00f3p ph\u1ea7n gi\u1ea3m thi\u1ec3u kh\u00ed hi\u1ec7u \u1ee9ng nh\u00e0 k\u00ednh v\u00e0 bi\u1ebfn \u0111\u1ed5i kh\u00ed h\u1eadu.<\/p>\n

T\u1eeb kh\u00f3a: C\u00e2n b\u1eb1ng n\u0103ng l\u01b0\u1ee3ng, r\u1ec5 c\u00e1m, b\u00f3n ph\u00e2n, r\u1eebng tr\u1ed3ng Keo tai t\u01b0\u1ee3ng, sinh kh\u1ed1i s\u1ea3n sinh.<\/p>\n

 <\/p>\n

Effect of fertilization on fine root production in an Acacia mangium<\/em> Willd plantation in Quang Ninh province<\/strong><\/p>\n

Roots (diameter \u2264 2 mm) of forest trees are known as fine roots. Such roots absorb water and nutrients to sustain tree\u2019s life and play an important role in carbon cycle and soil nutrient in forest ecosystem. Study in a 2-year-old plantation of Acacia mangium<\/em> Willd in Quang Ninh province indicated that fertilization increases fine root production. In control (without fertilization) fine root production was 707.86 g\/(m2 .year), increasing to 972.86 (g\/m2 .year) in fertilizing 400 g P2O5 (16.5%) + 100 g K2O (60%)\/tree (CT400) and to 1,252.88 (g\/m2 .year) in fertilizing 600 g P2O5 + 100 g K2O\/tree (CT600). In growing season\/summer, fine root production achieved 60.2% annual fine root production in control, reducing to 61.9% in CT400 and to 52.4% in CT600. It is concluded that fertilization plays an important role in forest plantation carbon cycle, increasing carbon sequestration and soil carbon sink, contributing to reducing global warming and climate change.<\/p>\n

Keywords: Acacia mangium<\/em> plantation, fertilization, fine root, mass-balanced model, production.<\/p>\n

PH\u00c2N B\u1ed0 V\u00c0 QUAN H\u1ec6 KH\u00d4NG GIAN C\u1ee6A LO\u00c0I C\u0102M XE (Xylia xylocarpa<\/em> (Roxb.) Taub.) TRONG R\u1eeaNG L\u00c1 R\u1ed8NG TH\u01af\u1edcNG XANH \u1ede KHU V\u1ef0C IA M\u01a0R, T\u1ec8NH GIA LAI<\/strong><\/p>\n

Nguy\u1ec5n V\u0103n Qu\u00fd1 , Ph\u1ea1m Thanh H\u00e02 , Nguy\u1ec5n V\u0103n H\u1ee3p1 , Nguy\u1ec5n Thanh Tu\u1ea5n1 , Nguy\u1ec5n H\u1eefu Th\u1ebf3 <\/strong><\/p>\n

1 Tr\u01b0\u1eddng \u0110\u1ea1i h\u1ecdc L\u00e2m nghi\u1ec7p – Ph\u00e2n hi\u1ec7u \u0110\u1ed3ng Nai <\/em><\/p>\n

2 Tr\u01b0\u1eddng \u0110\u1ea1i h\u1ecdc L\u00e2m nghi\u1ec7p <\/em><\/p>\n

3 Ph\u00e2n vi\u1ec7n \u0110i\u1ec1u tra, Quy ho\u1ea1ch r\u1eebng Nam Trung B\u1ed9 v\u00e0 T\u00e2y Nguy\u00ean<\/em><\/p>\n

T\u00d3M T\u1eaeT<\/p>\n

Nghi\u00ean c\u1ee9u n\u00e0y \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n trong ki\u1ec3u r\u1eebng l\u00e1 r\u1ed9ng th\u01b0\u1eddng xanh \u1edf khu v\u1ef1c Ia M\u01a1r, t\u1ec9nh Gia Lai \u0111\u1ec3 gi\u00fap hi\u1ec3u r\u00f5 h\u01a1n v\u1ec1 \u0111\u1eb7c \u0111i\u1ec3m sinh th\u00e1i c\u1ee7a lo\u00e0i C\u0103m xe – m\u1ed9t lo\u00e0i c\u00e2y \u0111a t\u00e1c d\u1ee5ng, c\u00f3 gi\u00e1 tr\u1ecb cao v\u1ec1 m\u1eb7t kinh t\u1ebf. D\u1eef li\u1ec7u \u0111\u01b0\u1ee3c thu th\u1eadp t\u1eeb t\u1ea5t c\u1ea3 c\u00e1c c\u00e2y th\u00e2n g\u1ed7 c\u00f3 \u0111\u01b0\u1eddng k\u00ednh ngang ng\u1ef1c (dbh) \u2265 5 cm trong 3 \u00f4 ti\u00eau chu\u1ea9n \u0111i\u1ec3n h\u00ecnh t\u1ea1m th\u1eddi (OTC) 1 ha (100\u00d7100 m). Ph\u01b0\u01a1ng ph\u00e1p ph\u00e2n t\u00edch m\u00f4 h\u00ecnh \u0111i\u1ec3m kh\u00f4ng gian d\u1ef1a tr\u00ean ph\u1ea7n m\u1ec1m R \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 ph\u00e2n t\u00edch d\u1eef li\u1ec7u nghi\u00ean c\u1ee9u. K\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u cho th\u1ea5y, C\u0103m xe c\u00f3 c\u1ea3 ph\u00e2n b\u1ed1 ki\u1ec3u c\u1ee5m, ng\u1eabu nhi\u00ean v\u00e0 \u0111\u1ec1u t\u1ea1i khu v\u1ef1c n\u01a1i lo\u00e0i ph\u00e2n b\u1ed1. Ph\u00e2n b\u1ed1 kh\u00f4ng gian c\u1ee7a C\u0103m xe b\u1ecb \u1ea3nh h\u01b0\u1edfng m\u1ea1nh b\u1edfi t\u00ednh kh\u00f4ng \u0111\u1ed3ng nh\u1ea5t c\u1ee7a m\u00f4i tr\u01b0\u1eddng s\u1ed1ng. Ph\u00e1t t\u00e1n gi\u1edbi h\u1ea1n l\u00e0 m\u1ed9t trong nh\u1eefng nguy\u00ean nh\u00e2n ch\u00ednh \u0111\u00e3 \u0111i\u1ec1u ch\u1ec9nh m\u00f4 h\u00ecnh ph\u00e2n b\u1ed1 kh\u00f4ng gian c\u1ee7a lo\u00e0i. Trong kho\u1ea3ng c\u00e1ch 0-10 m, quan h\u1ec7 c\u1ea1nh tranh gi\u1eefa C\u0103m xe v\u00e0 c\u00e1c lo\u00e0i \u01b0u th\u1ebf chi\u1ebfm t\u1ef7 l\u1ec7 l\u1edbn h\u01a1n so v\u1edbi quan h\u1ec7 t\u01b0\u01a1ng h\u1ed7 v\u00e0 \u0111\u1ed9c l\u1eadp (chi\u1ebfm 66,67% \u1edf r\u1eebng trung b\u00ecnh v\u00e0 50% \u1edf r\u1eebng gi\u00e0u). \u1ede kho\u1ea3ng c\u00e1ch 10-30 m, C\u0103m xe ch\u1ee7 y\u1ebfu c\u00f3 quan h\u1ec7 \u0111\u1ed9c l\u1eadp v\u1edbi c\u00e1c lo\u00e0i c\u00e2y thu\u1ed9c nh\u00f3m lo\u00e0i \u01b0u th\u1ebf trong l\u00e2m ph\u1ea7n (chi\u1ebfm 83,33% v\u00e0 71,43% trong t\u1ed5ng s\u1ed1 m\u1ed1i quan h\u1ec7 \u1edf 2 tr\u1ea1ng th\u00e1i r\u1eebng trung b\u00ecnh v\u00e0 gi\u00e0u). D\u1ef1a tr\u00ean k\u1ebft qu\u1ea3 c\u1ee7a nghi\u00ean c\u1ee9u n\u00e0y c\u00f3 th\u1ec3 \u0111i\u1ec1u ch\u1ec9nh m\u1eadt \u0111\u1ed9, ch\u1ecdn kho\u1ea3ng c\u00e1ch h\u1ed1 tr\u1ed3ng th\u00edch h\u1ee3p khi ph\u1ee5c h\u1ed3i ho\u1eb7c tr\u1ed3ng r\u1eebng m\u1edbi b\u1eb1ng lo\u00e0i C\u0103m xe v\u00e0 c\u00e1c lo\u00e0i c\u00e2y s\u1ed1ng chung v\u1edbi n\u00f3.<\/p>\n

T\u1eeb kh\u00f3a: H\u00e0m t\u01b0\u01a1ng quan c\u1eb7p, ph\u00e2n b\u1ed1 Poisson, c\u1ea1nh tranh kh\u00e1c lo\u00e0i, lo\u00e0i \u01b0u th\u1ebf, \u0111\u1eb7c \u0111i\u1ec3m sinh th\u00e1i.<\/p>\n

Spatial distribution patterns and associations of Xylia xylocarpa<\/em> (Roxb.) Taub. in an Ia Mor evergreen broadleaved forest, Gia Lai province<\/strong><\/p>\n

Present study was carried out in two medium and rich forest types of an Ia Mor evergreen broadleaved forest, Gia Lai province to help better understand the ecological characteristics of Xylia xylocarpa<\/em> – a multi-use tree species with high economic value. Research data were collected from all woody trees with diameter at breast height (dbh) \u2265 5 cm in three 1ha- study plots (100\u00d7100 m). The spatial point-patterns analysis method was used to analyze research data based on R version 4.1.1 software. Research results showed that Xylia xylocarpa<\/em> had both aggregated, random, and regular distribution in the area where this species distributed. The spatial distribution pattern of Xylia xylocarpa<\/em> was strongly influenced by the environmental heterogeneity effects in the study plot. Dispersal limitation is one of the mechanisms underlying the spatial pattern formation of Xylia xylocarpa<\/em> species. The repulsion association between Xylia xylocarpa <\/em>and dominant species accounts for a higher proportion than the attractive and independent association (accounting for 66.67% in medium forest and 50% in a rich forest) at scales of 0-10 m. Xylia xylocarpa<\/em> mainly had independent associations with tree species of the dominant species group in the stand (accounting for 83.33% and 71.43% of the total number of species-pairs in two medium and rich forest types) at scales of 10- 30 m. Based on present findings, it is possible to adjust the density as well as define the appropriate planting hole spacing when forest rehabilitation or reforestation by Xylia xylocarpa<\/em> and other species grow with it.<\/p>\n

Keywords: Paircorrelation function, Poisson distribution, interspecific competition, dominant species, ecological characteristics.<\/p>\n

 <\/p>\n

M\u00d4 H\u00ccNH H\u00d3A QUY LU\u1eacT SINH TR\u01af\u1edeNG R\u1eeaNG \u0110\u01af\u1edaC (Rhizophora apiculata Blum) TR\u1ed2NG TR\u00caN C\u00c1C L\u1eacP \u0110\u1ecaA T\u1ea0I B\u1ebeN TRE<\/strong><\/p>\n

Ho\u00e0ng V\u0103n Th\u01a1i, L\u00ea Thanh Quang, Nguy\u1ec5n Kh\u1eafc \u0110i\u1ec7u <\/strong><\/p>\n

Vi\u1ec7n Khoa h\u1ecdc L\u00e2m nghi\u1ec7p Nam B\u1ed9<\/em><\/p>\n

T\u00d3M T\u1eaeT<\/p>\n

Nghi\u00ean c\u1ee9u x\u00e2y d\u1ef1ng m\u00f4 h\u00ecnh h\u00f3a quy lu\u1eadt sinh tr\u01b0\u1edfng c\u1ee7a r\u1eebng tr\u1ed3ng \u0110\u01b0\u1edbc (Rhizophora apiculata) \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n t\u1eeb th\u00e1ng 4 \u0111\u1ebfn th\u00e1ng 12 n\u0103m 2020 t\u1ea1i Ban qu\u1ea3n l\u00fd r\u1eebng \u0111\u1eb7c d\u1ee5ng – ph\u00f2ng h\u1ed9 t\u1ec9nh B\u1ebfn Tre, nh\u1eb1m ph\u00e2n t\u00edch qu\u00e1 tr\u00ecnh sinh tr\u01b0\u1edfng c\u1ee7a r\u1eebng tr\u1ed3ng \u0110\u01b0\u1edbc t\u1eeb 5 – 35 tu\u1ed5i tr\u00ean ba l\u1eadp \u0111\u1ecba kh\u00e1c nhau. Sinh tr\u01b0\u1edfng (D, H v\u00e0 V) c\u1ee7a c\u00e2y b\u00ecnh qu\u00e2n \u0111\u01b0\u1ee3c ph\u00e2n t\u00edch t\u1eeb 45 c\u00e2y gi\u1ea3i t\u00edch; trung b\u00ecnh m\u1ed7i d\u1ea1ng l\u1eadp \u0111\u1ecba 15 c\u00e2y. C\u00e2y gi\u1ea3i t\u00edch \u0111\u01b0\u1ee3c thu th\u1eadp t\u1eeb 15 \u00f4 ti\u00eau chu\u1ea9n v\u1edbi k\u00edch th\u01b0\u1edbc l\u00e0 500 m2 m\u1ed7i \u00f4. Sinh tr\u01b0\u1edfng (D, H, V) c\u00e1c c\u00e2y b\u00ecnh qu\u00e2n \u0111\u01b0\u1ee3c ki\u1ec3m \u0111\u1ecbnh t\u1eeb b\u1ed1n h\u00e0m Korf, Schumacher, Drakin-Vuecski v\u00e0 Gompertz. C\u00e1c ch\u1ec9 ti\u00eau sinh tr\u01b0\u1edfng l\u00e2m ph\u1ea7n \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh b\u1eb1ng c\u00e1ch k\u1ebft h\u1ee3p h\u00e0m m\u1eadt \u0111\u1ed9 v\u00e0 h\u00e0m sinh tr\u01b0\u1edfng c\u00e2y b\u00ecnh qu\u00e2n. K\u1ebft qu\u1ea3 \u0111\u00e3 x\u00e1c \u0111\u1ecbnh \u0111\u01b0\u1ee3c sinh tr\u01b0\u1edfng \u0111\u01b0\u1eddng k\u00ednh, chi\u1ec1u cao (D, H) c\u00e2y b\u00ecnh qu\u00e2n v\u00e0 l\u00e2m ph\u1ea7n \u0110\u01b0\u1edbc t\u1ea1i B\u1ebfn Tre c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c m\u00f4 h\u00ecnh h\u00f3a b\u1eb1ng h\u00e0m Drakin-Vuecski; sinh tr\u01b0\u1edfng (V, M) \u0111\u01b0\u1ee3c m\u00f4 h\u00ecnh h\u00f3a b\u1eb1ng h\u00e0m Gompertz; m\u1eadt \u0111\u1ed9 (N) r\u1eebng tr\u1ed3ng \u0111\u01b0\u1ee3c m\u00f4 h\u00ecnh h\u00f3a b\u1eb1ng h\u00e0m m\u0169 \u00e2m. Sinh tr\u01b0\u1edfng \u0111\u01b0\u1eddng k\u00ednh th\u00e2n c\u00e2y chuy\u1ec3n t\u1eeb giai \u0111o\u1ea1n sinh tr\u01b0\u1edfng nhanh sang giai \u0111o\u1ea1n sinh tr\u01b0\u1edfng ch\u1eadm t\u1ea1i c\u1ea5p tu\u1ed5i II (6 – 10 tu\u1ed5i), tr\u00ean l\u1eadp \u0111\u1ecba 1 (tu\u1ed5i 6), tr\u00ean l\u1eadp \u0111\u1ecba 2 (tu\u1ed5i 7), l\u1eadp \u0111\u1ecba 3 (tu\u1ed5i 8). Sinh tr\u01b0\u1edfng chi\u1ec1u cao th\u00e2n c\u00e2y chuy\u1ec3n t\u1eeb giai \u0111o\u1ea1n sinh tr\u01b0\u1edfng nhanh sang giai \u0111o\u1ea1n sinh tr\u01b0\u1edfng ch\u1eadm c\u0169ng t\u1ea1i c\u1ea5p tu\u1ed5i II tr\u00ean c\u00e1c d\u1ea1ng l\u1eadp \u0111\u1ecba (tr\u00ean l\u1eadp \u0111\u1ecba 1 v\u00e0 l\u1eadp \u0111\u1ecba 2 t\u1ea1i tu\u1ed5i 5 v\u00e0 tr\u00ean l\u1eadp \u0111\u1ecba 3 l\u00e0 tu\u1ed5i 6). Sinh tr\u01b0\u1edfng th\u1ec3 t\u00edch th\u00e2n c\u00e2y tr\u00ean l\u1eadp \u0111\u1ecba 1 chuy\u1ec3n t\u1eeb giai \u0111o\u1ea1n sinh tr\u01b0\u1edfng nhanh sang giai \u0111o\u1ea1n sinh tr\u01b0\u1edfng ch\u1eadm t\u1ea1i c\u1ea5p tu\u1ed5i V (tu\u1ed5i 25), tr\u00ean l\u1eadp \u0111\u1ecba 2 v\u00e0 l\u1eadp \u0111\u1ecba 3 t\u1ea1i c\u1ea5p tu\u1ed5i VIa (tu\u1ed5i 26 v\u00e0 tu\u1ed5i 27). M\u1eadt \u0111\u1ed9 r\u1eebng c\u00f3 t\u1ef7 l\u1ec7 gi\u1ea3m h\u00e0ng n\u0103m v\u00e0 thay \u0111\u1ed5i theo t\u1eebng giai \u0111o\u1ea1n tu\u1ed5i v\u00e0 l\u1eadp \u0111\u1ecba tr\u1ed3ng; gi\u1ea3m nhanh \u1edf giai \u0111o\u1ea1n c\u1ea5p tu\u1ed5i II (5 – 10 tu\u1ed5i) v\u00e0 giai \u0111o\u1ea1n c\u1ea5p tu\u1ed5i III (10 – 15 tu\u1ed5i), th\u1ea5p d\u1ea7n \u1edf c\u00e1c c\u1ea5p tu\u1ed5i c\u00f2n l\u1ea1i; t\u1ef7 l\u1ec7 gi\u1ea3m m\u1eadt \u0111\u1ed9 trung b\u00ecnh tr\u00ean d\u1ea1ng l\u1eadp \u0111\u1ecba 1 v\u00e0 l\u1eadp \u0111\u1ecba 2 (11,7%) th\u1ea5p h\u01a1n so l\u1eadp \u0111\u1ecba 3 (32%). Sinh tr\u01b0\u1edfng b\u00ecnh qu\u00e2n c\u1ee7a r\u1eebng tr\u1ed3ng \u0111\u1ea1t th\u00e0nh th\u1ee5c tr\u00ean d\u1ea1ng l\u1eadp \u0111\u1ecba 1 t\u1ea1i c\u1ea5p tu\u1ed5i IV (tu\u1ed5i 20), l\u1eadp \u0111\u1ecba 2 v\u00e0 l\u1eadp \u0111\u1ecba 3 t\u1ea1i c\u1ea5p tu\u1ed5i V (tu\u1ed5i 21 v\u00e0 tu\u1ed5i 24).<\/p>\n

T\u1eeb kh\u00f3a: C\u00e2y \u0110\u01b0\u1edbc, m\u00f4 h\u00ecnh h\u00f3a, l\u1eadp \u0111\u1ecba, sinh tr\u01b0\u1edfng, tu\u1ed5i r\u1eebng.<\/p>\n

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Research on modeling the growth rules of Rhizophora apiculata<\/em> Blum at planted sites in Ben Tre province<\/strong><\/p>\n

Research on modeling the growth rules of mangrove forests (Rhizophora apiculata<\/em>) was carried out from April to December 2020 at the Management Board of Special Use – Protection Forests of Ben Tre province. The objective of the study was to analyze the growth process of mangrove plantations from 5 to 35 years old on three different sites in Ben Tre province. Growth (D, H and V) of the average tree was analyzed from 45 analytic trees; in which each site type 15 trees. Analytical trees were collected from 158 standard plots with a standard plot size of 500 m2 . Growth (D, H, V) for the mean tree is tested from four functions Korf, Schumacher, Drakin-Vuecski and Gompertz. Stand trees level growth was determined by combining the density function and the average tree growth function. The results have determined that the growth in diameter, height (D, H) of the average tree and mangrove population in Ben Tre can be modeled by the Drakin-Vuecski function; growth (V, M) is modeled using the Gompertz function; density (N) of plantations is modeled by negative exponential function. Stem diameter growth changed from rapid growth to slow growth at the class II on sites, on site 1 at the age of 6, on site 2 at age 7, on site 3 at age 8. Plant height growth on sites changed from the fast growing phase to the slow growing stage at the class II, on site site 1 and site 2 at the age 5 and on site 3 at the age 6. Stem volume growth on site 1 changed from the fast growing phase to the growing stage slow growth at the class V (age of 25), on site 2 and on site 3 at the class VIa (at age 26 and at age 27). Forest density has an annual rate of decrease and varies with age and planting site; decrease rapidly at the stage of 5 – 10 years old (class II) and the period of 10 – 15 years old (class III), lower at the remaining another ages class ; The average density reduction rate on site 1 and site 2 (11.7%) was lower than that of site 3 (32%). Average growth of plantations reached maturity on site 1 at class IV (age 20), site 2 and site 3 at the class V (age 21 and age 24).<\/p>\n

Keywords: Mangrove tree, modeling, site, growth, forest age class.<\/p>\n

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\u0110\u1eb6C \u0110I\u1ec2M L\u00c2M H\u1eccC C\u1ee6A LO\u00c0I \u01af\u01a0I (Scaphium macropodum<\/em>) \u1ede TH\u1eeaA THI\u00caN HU\u1ebe<\/strong><\/p>\n

Ph\u1ea1m \u0110\u00ecnh S\u00e2m, H\u1ed3 Trung L\u01b0\u01a1ng, Ho\u00e0ng Th\u1ecb Nhung, Ho\u00e0ng V\u0103n Th\u00e0nh, Nguy\u1ec5n Thanh S\u01a1n, Nguy\u1ec5n H\u1eefu Th\u1ecbnh, H\u00e0 Th\u1ecb Mai, Tr\u1ea7n Th\u1ecb H\u1ed3ng V\u00e2n <\/strong><\/p>\n

Vi\u1ec7n Nghi\u00ean c\u1ee9u L\u00e2m sinh<\/em><\/p>\n

T\u00d3M T\u1eaeT<\/p>\n

K\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u m\u1ed9t s\u1ed1 \u0111\u1eb7c \u0111i\u1ec3m l\u00e2m h\u1ecdc c\u1ee7a c\u00e2y \u01af\u01a1i (Scaphium macropodum<\/em>) t\u1ea1i Th\u1eeba Thi\u00ean Hu\u1ebf cho th\u1ea5y, \u01af\u01a1i c\u00f3 ph\u00e2n b\u1ed1 t\u1ef1 nhi\u00ean trong c\u1ea3 3 tr\u1ea1ng th\u00e1i r\u1eebng gi\u00e0u, trung b\u00ecnh v\u00e0 ngh\u00e8o. \u01af\u01a1i th\u00edch h\u1ee3p kh\u00ed h\u1eadu \u1ea5m v\u00e0 \u1ea9m, trong \u0111i\u1ec1u ki\u1ec7n th\u1ea3m th\u1ef1c v\u1eadt c\u00f2n kh\u00e1 t\u1ed1t, c\u00f3 t\u1ea7ng c\u00e2y g\u1ed7 v\u01b0\u1ee3t t\u00e1n \u1edf \u0111\u1ed9 cao t\u1eeb 127 – 343 m so v\u1edbi m\u1ef1c n\u01b0\u1edbc bi\u1ec3n. M\u1eadt \u0111\u1ed9 t\u1ea7ng c\u00e2y cao trong c\u00e1c tr\u1ea1ng th\u00e1i r\u1eebng c\u00f3 \u01af\u01a1i ph\u00e2n b\u1ed1 bi\u1ebfn \u0111\u1ed9ng t\u1eeb 780 c\u00e2y\/ha \u0111\u1ebfn 850 c\u00e2y\/ha. M\u1eadt \u0111\u1ed9 c\u00e2y \u01af\u01a1i ph\u00e2n b\u1ed1 kh\u00f4ng \u0111\u1ed3ng \u0111\u1ec1u \u1edf 3 tr\u1ea1ng th\u00e1i (28 c\u00e2y\/ha – 37c\u00e2y\/ha). S\u1ef1 tham gia c\u1ee7a lo\u00e0i \u01af\u01a1i v\u00e0o t\u1ed5 th\u00e0nh r\u1eebng l\u00e0 kh\u00f4ng r\u00f5 r\u1ec7t v\u00e0 m\u1eadt \u0111\u1ed9 \u01af\u01a1i kh\u00f4ng ph\u1ee5 thu\u1ed9c v\u00e0o m\u1eadt \u0111\u1ed9 l\u00e2m ph\u1ea7n. C\u00e2y \u01af\u01a1i t\u00e1i sinh ho\u00e0n to\u00e0n b\u1eb1ng h\u1ea1t v\u00e0 c\u00f3 ch\u1ea5t l\u01b0\u1ee3ng kh\u00e1 t\u1ed1t, s\u1ed1 l\u01b0\u1ee3ng c\u00e2y t\u00e1i sinh nhi\u1ec1u \u1edf r\u1eebng ngh\u00e8o v\u00e0 r\u1eebng trung b\u00ecnh; s\u1ed1 l\u01b0\u1ee3ng c\u00e2y t\u00e1i sinh c\u00f3 tri\u1ec3n v\u1ecdng nhi\u1ec1u nh\u1ea5t \u1edf r\u1eebng trung b\u00ecnh l\u00e0 15 c\u00e2y\/ha M\u1eadt \u0111\u1ed9 c\u00e2y t\u00e1i sinh c\u00f3 m\u1ed1i t\u01b0\u01a1ng quan kh\u00e1 ch\u1eb7t v\u1edbi m\u1eadt \u0111\u1ed9 l\u00e2m ph\u1ea7n.<\/p>\n

T\u1eeb kh\u00f3a: L\u00e2m h\u1ecdc, Th\u1eeba Thi\u00ean Hu\u1ebf, c\u00e2y \u01af\u01a1i.<\/p>\n

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Silvicultural characteristics of Scaphium macropodum<\/em> in Thua Thien Hue, Vietnam<\/strong><\/p>\n

The results of research on some silvicultural characteristics of Scaphium macropodum<\/em> in Thua Thien Hue showed that it is naturally distributed in all three forest states (rich, medium and poor forests). The species is suitable for warm and humid climate, with quite developed vegetation and an emergence layer at an altitude of 127 – 343 m above sea level. The overstory density in forest states with Scaphium macropodum<\/em>\u2019s distribution varied from 780 trees\/ha to 850 trees\/ha. Species density is unevenly distributed in 3 states (28 tree\/ha – 37 tree\/ha). Its\u2019 participation in the forest composition is not obvious and its\u2019 density does not depend on the stand density. The species regenerates completely by seeds and has good quality, the number of regeneration trees is high in poor and medium forests, the number of prospective regeneration trees is biggest in medium forest (15 trees\/ha). Density of regenerated trees has a strong correlation with stand density.<\/p>\n

Keywords: Thua Thien Hue, Silvicultural characteristics, Scaphium macropodum<\/em><\/p>\n

PH\u00c2N T\u00cdCH C\u00c1C CH\u00cdNH S\u00c1CH LI\u00caN QUAN \u0110\u1ebeN QU\u1ea2N L\u00dd R\u1eeaNG B\u1ec0N V\u1eeeNG V\u00c0 CH\u1ee8NG CH\u1ec8 R\u1eeaNG, TR\u01af\u1edcNG H\u1ee2P NGHI\u00caN C\u1ee8U \u0110I\u1ec2M \u1ede T\u1ec8NH QU\u1ea2NG TR\u1eca<\/strong><\/p>\n

Nguy\u1ec5n Ho\u00e0ng Ti\u1ec7p1 , V\u00f5 \u0110\u1ea1i H\u1ea3i2 <\/strong><\/p>\n

1 Trung t\u00e2m Nghi\u00ean c\u1ee9u Kinh t\u1ebf L\u00e2m nghi\u1ec7p <\/em><\/p>\n

2 Vi\u1ec7n Khoa h\u1ecdc L\u00e2m nghi\u1ec7p Vi\u1ec7t Nam<\/em><\/p>\n

T\u00d3M T\u1eaeT<\/p>\n

Qu\u1ea3n l\u00fd r\u1eebng b\u1ec1n v\u1eefng (QLRBV) v\u00e0 ch\u1ee9ng ch\u1ec9 r\u1eebng (CCR) l\u00e0 ch\u1ee7 \u0111\u1ec1 \u0111\u01b0\u1ee3c ng\u00e0nh l\u00e2m nghi\u1ec7p n\u01b0\u1edbc ta \u0111\u1eb7c bi\u1ec7t quan t\u00e2m trong th\u1eddi gian g\u1ea7n \u0111\u00e2y, c\u1ea3 v\u1ec1 vi\u1ec7c ban h\u00e0nh c\u00e1c ch\u00ednh s\u00e1ch li\u00ean quan l\u1eabn tri\u1ec3n khai m\u00f4 h\u00ecnh trong th\u1ef1c ti\u1ec5n. Nghi\u00ean c\u1ee9u n\u00e0y \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n nh\u1eb1m h\u1ec7 th\u1ed1ng h\u00f3a c\u00e1c ch\u00ednh s\u00e1ch li\u00ean quan \u0111\u1ebfn QLRBV&CCR \u0111\u01b0\u1ee3c ban h\u00e0nh \u1edf c\u1ea5p Trung \u01b0\u01a1ng v\u00e0 li\u00ean h\u1ec7 th\u1ef1c ti\u1ec5n tri\u1ec3n khai \u1edf t\u1ec9nh Qu\u1ea3ng Tr\u1ecb. Nghi\u00ean c\u1ee9u \u0111\u00e3 s\u1eed d\u1ee5ng ph\u01b0\u01a1ng ph\u00e1p r\u00e0 so\u00e1t ch\u00ednh s\u00e1ch, k\u1ebft h\u1ee3p v\u1edbi kh\u1ea3o s\u00e1t v\u00e0 ph\u1ecfng v\u1ea5n c\u00e1c c\u00e1n b\u1ed9 qu\u1ea3n l\u00fd, c\u00e1c ch\u1ee7 r\u1eebng t\u1ea1i \u0111\u1ecba ph\u01b0\u01a1ng. K\u1ebft qu\u1ea3 cho th\u1ea5y c\u00f3 13 v\u0103n b\u1ea3n, ch\u00ednh s\u00e1ch \u0111\u00e3 \u0111\u01b0\u1ee3c ban h\u00e0nh b\u1edfi c\u00e1c c\u01a1 quan \u1edf c\u1ea5p Trung \u01b0\u01a1ng, trong \u0111\u00f3 c\u00f3 2 Quy\u1ebft \u0111\u1ecbnh v\u00e0 1 Th\u00f4ng t\u01b0 tr\u1ef1c ti\u1ebfp v\u1ec1 QLRBV&CCR. C\u00e1c ch\u00ednh s\u00e1ch n\u00e0y \u0111\u00e3 t\u1ea1o c\u01a1 s\u1edf, h\u00e0nh lang ph\u00e1p l\u00fd v\u00e0 \u0111\u1ecbnh h\u01b0\u1edbng \u0111\u1ec3 th\u00fac \u0111\u1ea9y tri\u1ec3n khai t\u1eeb vi\u1ec7c QLRBV&CCR trong Lu\u1eadt L\u00e2m nghi\u1ec7p 2017, \u0111\u1ebfn quy \u0111\u1ecbnh v\u1ec1 x\u00e2y d\u1ef1ng h\u1ec7 th\u1ed1ng ch\u1ee9ng ch\u1ec9 r\u1eebng qu\u1ed1c gia \u0111\u01b0\u1ee3c qu\u1ed1c t\u1ebf c\u00f4ng nh\u1eadn, \u0111\u1eb7t ra ch\u1ec9 ti\u00eau di\u1ec7n t\u00edch \u0111\u01b0\u1ee3c c\u1ea5p CCR \u0111\u1ec3 th\u1ef1c hi\u1ec7n v\u00e0 h\u1ed7 tr\u1ee3 kinh ph\u00ed cho r\u1eebng \u0111\u01b0\u1ee3c c\u1ea5p CCR. Th\u1ef1c hi\u1ec7n c\u00e1c ch\u00ednh s\u00e1ch n\u00e0y, t\u1ec9nh Qu\u1ea3ng Tr\u1ecb c\u0169ng \u0111\u00e3 c\u00f3 nhi\u1ec1u ch\u1ee7 tr\u01b0\u01a1ng, h\u1ed7 tr\u1ee3 v\u00e0 th\u00fac \u0111\u1ea9y QLRBV&CCR tr\u00ean \u0111\u1ecba b\u00e0n t\u1ec9nh. N\u0103m 2020 c\u00f3 3 c\u00f4ng ty v\u00e0 1 nh\u00f3m h\u1ed9 tr\u00ean \u0111\u1ecba b\u00e0n t\u1ec9nh \u0111\u01b0\u1ee3c c\u1ea5p CCR v\u1edbi t\u1ed5ng di\u1ec7n t\u00edch l\u00e0 25.416 ha. Tuy nhi\u00ean, c\u00e1c ch\u00ednh s\u00e1ch v\u1ec1 QLRBV&CCR v\u1eabn c\u00f2n nhi\u1ec1u kho\u1ea3ng tr\u1ed1ng nh\u01b0 c\u1ea7n \u0111\u01b0\u1ee3c b\u1ed5 sung nh\u01b0: c\u1ea7n x\u00e1c \u0111\u1ecbnh di\u1ec7n t\u00edch r\u1eebng c\u1ea7n \u0111\u01b0\u1ee3c c\u1ea5p CCR ph\u00f9 h\u1ee3p v\u1edbi nhu c\u1ea7u th\u1ef1c t\u1ebf, tri\u1ec3n khai th\u1ef1c hi\u1ec7n h\u1ed7 tr\u1ee3 kinh ph\u00ed c\u1ea5p CCR; \u0111\u1ea9y m\u1ea1nh vi\u1ec7c h\u1ed7 tr\u1ee3 th\u1ecb tr\u01b0\u1eddng, qu\u1ea3ng b\u00e1 s\u1ea3n ph\u1ea9m g\u1ed7 c\u00f3 CCR,… Nghi\u00ean c\u1ee9u \u0111\u00e3 \u0111\u1ec1 xu\u1ea5t \u0111\u1ecbnh h\u01b0\u1edbng s\u1eeda \u0111\u1ed5i c\u00e1c ch\u00ednh s\u00e1ch v\u00e0 gi\u1ea3i ph\u00e1p h\u1ed7 tr\u1ee3 \u0111\u1ec3 \u0111\u1ea9y m\u1ea1nh vi\u1ec7c th\u1ef1c hi\u1ec7n QLRBV v\u00e0 c\u1ea5p CCR.<\/p>\n

T\u1eeb kh\u00f3a: Qu\u1ea3n l\u00fd r\u1eebng b\u1ec1n v\u1eefng, ch\u1ee9ng ch\u1ec9 r\u1eebng, ch\u00ednh s\u00e1ch, t\u1ec9nh Qu\u1ea3ng Tr\u1ecb<\/p>\n

 <\/p>\n

Analyzing policies related to sustainable forest management and forest certification, case study in Quang Tri province<\/strong><\/p>\n

Sustainable forest management (SFM) and forest certification (FC) have been considered as one of main key address forestry sector in recent times, both in terms of promulgating relevant policies and implementing models in practice. This study was carried out in order to systematize policies related to SFM issued at the central level and the implementation in Quang Tri province. The study used the policy review method, combined with surveys and interviews with local forest managers and forest owners. The results show that there are 13 documents and policies that have been issued by state agencies at central level, including 2 Decisions and 1 Circular directing to SFM and FC. These policies have created the basis, legal framework and orientation to promote the SFM&FC implementation such as the forestry law 2017, regulations on building Vietnam forest certification scheme which is recognized by international community, setting targets areas for FC and financial support for FC granted. Implementing these policies, Quang Tri province is also introduced many policies, supporting and promoting SFM in the province. In 2020, there are 3 companies and 1 group of households in the province have FC with a total area of 25,416 ha that need to be addressed such as: determining the forest area to be issued FC based on wood industry needs, guideline to implement FC supporting fee; suppporting to market promotion for wood with FC, etc. This paper also proposes orientations to amend policies and support solutions to promote the implementation of SFM&CF in near future.<\/p>\n

Keyword: Sustainable forest management, forest certification, policy, Quang Tri province<\/p>\n

GI\u00c1 TR\u1eca D\u1ecaCH V\u1ee4 H\u1ec6 SINH TH\u00c1I C\u1ee6A M\u1ed8T S\u1ed0 LO\u1ea0I H\u00ccNH S\u1eec D\u1ee4NG \u0110\u1ea4T T\u1ea0I THANH H\u00d3A<\/strong><\/p>\n

\u0110\u1eb7ng Th\u1ecbnh Tri\u1ec1u <\/strong><\/p>\n

Vi\u1ec7n Nghi\u00ean c\u1ee9u L\u00e2m sinh – Vi\u1ec7n Khoa h\u1ecdc L\u00e2m nghi\u1ec7p Vi\u1ec7t Nam<\/em><\/p>\n

T\u00d3M T\u1eaeT<\/p>\n

Nghi\u00ean c\u1ee9u n\u00e0y \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n nh\u1eb1m gi\u00e1 tr\u1ecb d\u1ecbch v\u1ee5 h\u1ec7 sinh th\u00e1i c\u1ee7a r\u1eebng lu\u1ed3ng v\u00e0 m\u1ed9t s\u1ed1 lo\u1ea1i h\u00ecnh s\u1eed d\u1ee5ng \u0111\u1ea5t kh\u00e1c t\u1ea1i Thanh H\u00f3a nh\u01b0 r\u1eebng tr\u1ed3ng Keo tai t\u01b0\u1ee3ng, r\u1eebng t\u1ef1 nhi\u00ean l\u00e1 r\u1ed9ng th\u01b0\u1eddng xanh, l\u00faa n\u01b0\u1edbc, ng\u00f4 v\u00e0 s\u1eafn. C\u00e1c ch\u1ec9 s\u1ed1 \u0111\u1ecbnh l\u01b0\u1ee3ng v\u00e0 \u0111\u1ecbnh t\u00ednh \u0111\u01b0\u1ee3c ph\u00e2n t\u00edch d\u1ef1a tr\u00ean d\u1eef li\u1ec7u k\u1ebf th\u1eeba t\u1eeb c\u00e1c ngu\u1ed3n kh\u00e1c nhau v\u00e0 t\u1eeb k\u1ebft qu\u1ea3 ph\u1ecfng v\u1ea5n. K\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u cho th\u1ea5y r\u1eebng lu\u1ed3ng cung c\u1ea5p nhi\u1ec1u d\u1ecbch v\u1ee5 h\u1ec7 sinh th\u00e1i c\u00f3 gi\u00e1 tr\u1ecb t\u01b0\u01a1ng t\u1ef1 nh\u01b0 c\u00e1c lo\u1ea1i r\u1eebng kh\u00e1c. K\u1ebft qu\u1ea3 ph\u00e2n t\u00edch \u0111\u1ecbnh l\u01b0\u1ee3ng cho th\u1ea5y, r\u1eebng lu\u1ed3ng cho thu nh\u1eadp h\u00e0ng n\u0103m th\u1ea5p h\u01a1n so v\u1edbi c\u00e1c lo\u1ea1i h\u00ecnh s\u1eed d\u1ee5ng \u0111\u1ea5t n\u00f4ng nghi\u1ec7p v\u00e0 nhu c\u1ea7u nh\u00e2n l\u1ef1c c\u0169ng th\u1ea5p h\u01a1n. Tuy nhi\u00ean, gi\u00e1 tr\u1ecb ng\u00e0y c\u00f4ng lao \u0111\u1ed9ng t\u1eeb lu\u1ed3ng l\u1ea1i cao g\u1ea5p \u0111\u00f4i so v\u1edbi ng\u00e0y c\u00f4ng canh t\u00e1c l\u00faa n\u01b0\u1edbc, s\u1eafn v\u00e0 ng\u00f4. K\u1ebft qu\u1ea3 ph\u00e2n t\u00edch \u0111\u1ecbnh t\u00ednh cho th\u1ea5y, gi\u00e1 tr\u1ecb d\u1ecbch v\u1ee5 h\u1ec7 sinh th\u00e1i c\u1ee7a r\u1eebng lu\u1ed3ng cao h\u01a1n so v\u1edbi r\u1eebng tr\u1ed3ng Keo tai t\u01b0\u1ee3ng v\u00e0 r\u1eebng t\u1ef1 nhi\u00ean, nh\u01b0ng tr\u1eef l\u01b0\u1ee3ng carbon c\u1ee7a r\u1eebng lu\u1ed3ng t\u1ea1i m\u1ed9t th\u1eddi \u0111i\u1ec3m nh\u1ea5t \u0111\u1ecbnh l\u1ea1i th\u1ea5p h\u01a1n so v\u1edbi 2 lo\u1ea1i r\u1eebng tr\u00ean, do lu\u1ed3ng th\u01b0\u1eddng xuy\u00ean \u0111\u01b0\u1ee3c khai th\u00e1c v\u00e0 c\u00f3 kh\u1ea3 n\u0103ng sinh m\u0103ng h\u00e0ng n\u0103m, sinh tr\u01b0\u1edfng c\u1ee7a lu\u1ed3ng c\u0169ng nhanh h\u01a1n so v\u1edbi Keo tai t\u01b0\u1ee3ng v\u00e0 c\u00e2y g\u1ed7 r\u1eebng t\u1ef1 nhi\u00ean, n\u00ean l\u01b0\u1ee3ng carbon t\u00edch l\u0169y trong c\u1ea3 qu\u00e1 tr\u00ecnh kinh doanh c\u1ee7a r\u1eebng lu\u1ed3ng cao h\u01a1n so v\u1edbi Keo tai t\u01b0\u1ee3ng v\u00e0 r\u1eebng t\u1ef1 nhi\u00ean.<\/p>\n

T\u1eeb kh\u00f3a: Lu\u1ed3ng (Dendrocalamus barbatus<\/em>), d\u1ecbch v\u1ee5 h\u1ec7 sinh th\u00e1i, Thanh H\u00f3a<\/p>\n

 <\/p>\n

Evaluation of ecosystem services in different land use types in Thanh Hoa province<\/strong><\/p>\n

This study attempts to evaluate ecosystem services (ES) for several types of land use in Thanh Hoa province including luong bamboo plantation (Dendrocalamus barbatus<\/em>), natural timber forest, Acacia mangium<\/em> plantation, paddy rice farming, maize farming and cassava farming. Quantitative and qualitative indexes were analysed based on data and information from a literature review and interviews with experts. The study results showed that bamboo forestry provides many valuable ecosystem services similar to other forest types. Results of quantitative analysis demonstrated that the bamboo plantation provided lower monetary value per unit of land; the labour required to manage the plantation is lower than that of annual crops. However, the daily worker\u2019s income on the plantation was almost twice that of yearly crops. The qualitative analysis showed that communities valued ecosystem services provided by bamboo forests more than those of the Acacia plantation and natural forest, exception that carbon stock of bamboo forest was estimated lower than that of standing Acacia plantation and of natural forests. However, luong bamboo is regularly harvested and luong produces shoots every year, the growth of luong is also faster than of Acacia mangium<\/em> and natural forest trees, so the amount of carbon accumulated in the whole rotation of luong forest is higher than Acacia mangium<\/em> and natural forests.<\/p>\n

Keywords: Dendrocalamus barbatus<\/em>, ecosystem service, Thanh Hoa<\/p>\n

\u0110\u1eb6C \u0110I\u1ec2M V\u00c0 VAI TR\u00d2 C\u1ee6A V\u1ed0N X\u00c3 H\u1ed8I TRONG B\u1ea2O V\u1ec6 V\u00c0 PH\u00c1T TRI\u1ec2N R\u1eeaNG C\u1ed8NG \u0110\u1ed2NG \u1ede KHU V\u1ef0C B\u1eaeC TRUNG B\u1ed8<\/strong><\/p>\n

Ng\u00f4 V\u0103n H\u1ed3ng1 , B\u00f9i Th\u1ebf \u0110\u1ed3i2 , Tr\u1ea7n Ng\u1ecdc H\u1ea3i2 , \u0110\u1ed7 Anh Tu\u00e2n2 <\/strong><\/p>\n

1 Trung t\u00e2m Nghi\u00ean c\u1ee9u Qu\u1ea3n tr\u1ecb t\u00e0i nguy\u00ean v\u00f9ng cao <\/em><\/p>\n

2 Tr\u01b0\u1eddng \u0110\u1ea1i h\u1ecdc L\u00e2m nghi\u1ec7p<\/em><\/p>\n

 <\/p>\n

T\u00d3M T\u1eaeT<\/p>\n

Nghi\u00ean c\u1ee9u n\u00e0y \u0111\u00e1nh gi\u00e1 \u0111\u1eb7c \u0111i\u1ec3m v\u00e0 \u1ea3nh h\u01b0\u1edfng c\u1ee7a v\u1ed1n x\u00e3 h\u1ed9i c\u1ee7a c\u00e1c c\u1ed9ng \u0111\u1ed3ng \u0111\u1ebfn hi\u1ec7u qu\u1ea3 b\u1ea3o v\u1ec7 v\u00e0 ph\u00e1t tri\u1ec3n r\u1eebng c\u1ed9ng \u0111\u1ed3ng khu v\u1ef1c B\u1eafc Trung B\u1ed9. Nghi\u00ean c\u1ee9u \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n t\u1ea1i 6 m\u00f4 h\u00ecnh qu\u1ea3n l\u00fd r\u1eebng c\u1ed9ng \u0111\u1ed3ng \u1edf 3 t\u1ec9nh trong khu v\u1ef1c th\u00f4ng qua vi\u1ec7c \u0111i\u1ec1u tra \u0111\u00e1nh gi\u00e1 n\u00f4ng th\u00f4n c\u00f3 s\u1ef1 tham gia v\u00e0 ph\u1ecfng v\u1ea5n chuy\u00ean s\u00e2u 181 h\u1ed9 gia \u0111\u00ecnh v\u1ec1 c\u00e1c y\u1ebfu t\u1ed1 v\u1ed1n x\u00e3 h\u1ed9i c\u1ee7a c\u1ed9ng \u0111\u1ed3ng v\u00e0 hi\u1ec7u qu\u1ea3 b\u1ea3o v\u1ec7 v\u00e0 ph\u00e1t tri\u1ec3n r\u1eebng c\u1ed9ng \u0111\u1ed3ng. K\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u cho th\u1ea5y b\u1ea3n ch\u1ea5t \u0111a chi\u1ec1u (nhi\u1ec1u kh\u00eda c\u1ea1nh kh\u00e1c nhau c\u1ee7a v\u1ed1n x\u00e3 h\u1ed9i t\u1eeb m\u1ea1ng l\u01b0\u1edbi \u0111\u1ebfn quan \u0111i\u1ec3m chia s\u1ebb) c\u0169ng nh\u01b0 s\u1ef1 kh\u00e1c bi\u1ec7t v\u1ec1 m\u1ee9c \u0111\u1ed9 v\u1ed1n x\u00e3 h\u1ed9i \u1edf c\u00e1c c\u1ed9ng \u0111\u1ed3ng nghi\u00ean c\u1ee9u. C\u00e1c k\u1ebft qu\u1ea3 ph\u00e2n t\u00edch th\u1ed1ng k\u00ea \u0111\u1ecbnh l\u01b0\u1ee3ng \u0111\u00e3 ch\u1ee9ng minh r\u1eb1ng v\u1ed1n x\u00e3 h\u1ed9i hi\u1ec7n c\u00f3 c\u1ee7a c\u00e1c c\u1ed9ng \u0111\u1ed3ng \u0111\u00e3 th\u00fac \u0111\u1ea9y vi\u1ec7c th\u1ef1c thi qu\u1ea3n l\u00fd v\u00e0 hi\u1ec7u qu\u1ea3 b\u1ea3o v\u1ec7 v\u00e0 ph\u00e1t tri\u1ec3n t\u00e0i nguy\u00ean r\u1eebng c\u1ed9ng \u0111\u1ed3ng. N\u01a1i c\u00f3 v\u1ed1n x\u00e3 h\u1ed9i cao th\u00ec t\u00e0i nguy\u00ean c\u1ed9ng \u0111\u1ed3ng \u0111\u01b0\u1ee3c b\u1ea3o v\u1ec7 v\u00e0 ph\u00e1t tri\u1ec3n t\u1ed1t h\u01a1n. Trong \u0111\u00f3, c\u00e1c ch\u1ec9 s\u1ed1 m\u1ea1ng l\u01b0\u1edbi, s\u1ef1 tin t\u01b0\u1edfng v\u00e0 s\u1ef1 t\u01b0\u01a1ng h\u1ed7 gi\u00fap \u0111\u1ee1 l\u1eabn nhau c\u00f3 t\u01b0\u01a1ng quan c\u00f3 \u00fd ngh\u0129a th\u1ed1ng k\u00ea v\u00e0 \u0111\u1ed3ng bi\u1ebfn v\u1edbi hi\u1ec7u qu\u1ea3 b\u1ea3o v\u1ec7 v\u00e0 ph\u00e1t tri\u1ec3n r\u1eebng c\u1ed9ng \u0111\u1ed3ng. V\u00ec v\u1eady, \u0111\u1ec3 th\u00fac \u0111\u1ea9y qu\u1ea3n l\u00fd r\u1eebng c\u1ed9ng \u0111\u1ed3ng b\u1ec1n v\u1eefng, c\u00e1c y\u1ebfu t\u1ed1 v\u1ed1n x\u00e3 h\u1ed9i c\u1ea7n \u0111\u01b0\u1ee3c coi nh\u01b0 l\u00e0 ngu\u1ed3n l\u1ef1c quan tr\u1ecdng c\u1ea7n \u0111\u01b0\u1ee3c nh\u1eadn di\u1ec7n, duy tr\u00ec v\u00e0 t\u0103ng c\u01b0\u1eddng nh\u1eb1m th\u00fac \u0111\u1ea9y s\u1ef1 g\u1eafn k\u1ebft, s\u1ef1 tham gia v\u00e0 n\u00e2ng cao hi\u1ec7u qu\u1ea3 t\u1ed5 ch\u1ee9c c\u00e1c ho\u1ea1t \u0111\u1ed9ng qu\u1ea3n l\u00fd r\u1eebng c\u1ed9ng \u0111\u1ed3ng.<\/p>\n

T\u1eeb kho\u00e1: B\u1eafc Trung B\u1ed9, r\u1eebng c\u1ed9ng \u0111\u1ed3ng, v\u1ed1n x\u00e3 h\u1ed9i<\/p>\n

Characteristics and effects of social capital on community forest management in the North Central Region<\/strong><\/p>\n

This study analyzed the characteristics and effects of social capital of local communities on the performance of community forest management in the North Central Region of Vietnam. The study was carried out at 6 models of community forest management in 3 provinces in the region through application of participatory rural assessment survey and in-depth interviews with 181 households about the social capital factors of the communities and their effects on the outcomes of community forest management. The research result shows the multidimensional aspects of local social capital (from the network to the shared values) as well as the variation of the social capital values in the studied communities. The result of this quantitative statistical analysis confirms that the existing social capital of the communities has promoted the implementation and the performance of the community forest resources management. higher social capital is; the better community forest management performance is in terms of forest entirety. Of which, social indexes of network, trust and reciprocity (mutual help) are significantly and positively correlated with the theoutcomes of community forest management. Therefore, in order to promote sustainable community forest management, social capital needs to be considered as an important resource to be identified, maintained and enhanced in order to promote cohesion, participation, for the sucessfullness of community forest management.<\/p>\n

Keywords: Community forest, North Central Region, social capital<\/p>\n

NGHI\u00caN C\u01af\u0301U \u0110\u1eb6C \u0110I\u1ec2M V\u1eacT LI\u1ec6U CH\u00c1Y V\u00c0 NGUY C\u01a0 CH\u00c1Y R\u1eeaNG T\u1ea0I T\u1ec8NH \u0110\u1ed2NG NAI<\/strong><\/p>\n

D\u01b0\u01a1ng Huy Kh\u00f4i1 , Tr\u00e2\u0300n Quang Ba\u0309o2 , Vo\u0303 Minh Hoa\u0300n2 , Nguy\u00ea\u0303n Thi\u0323 Hoa2 <\/strong><\/p>\n

1 Tr\u01b0\u01a1\u0300ng \u0110a\u0323i ho\u0323c Pho\u0300ng cha\u0301y Ch\u01b0\u0303a cha\u0301y <\/em><\/p>\n

2 Tr\u01b0\u01a1\u0300ng \u0110a\u0323i ho\u0323c L\u00e2m nghi\u00ea\u0323p<\/em><\/p>\n

T\u00d3M T\u1eaeT<\/p>\n

Ba\u0300i ba\u0301o to\u0301m t\u0103\u0301t k\u00ea\u0301t qua\u0309 x\u00e1c \u0111\u1ecbnh \u0111\u0103\u0323c \u0111i\u00ea\u0309m v\u1eadt li\u1ec7u ch\u00e1y, nguy c\u01a1 ch\u00e1y r\u1eebng l\u00e0m c\u01a1 s\u1edf x\u00e2y d\u1ef1ng c\u00e1c bi\u1ec7n ph\u00e1p ph\u00f2ng ch\u00e1y r\u1eebng ta\u0323i ti\u0309nh \u0110\u00f4\u0300ng Nai. S\u00f4\u0301 li\u00ea\u0323u \u0111\u01b0\u01a1\u0323c thu th\u00e2\u0323p t\u1eeb th\u00e1ng 1\/2020 \u0111\u1ebfn th\u00e1ng 4\/2020, tr\u00ean 50 \u00f4 ti\u00eau chu\u1ea9n (OTC) v\u1edbi di\u1ec7n t\u00edch 500 m2 (c\u1ea5p 1), tr\u00ean 8 tra\u0323ng tha\u0301i r\u1eebng c\u00f3 nguy c\u01a1 ch\u00e1y cao. Th\u01b0\u0323c nghi\u00ea\u0323m \u0111\u00f4\u0301t th\u01b0\u0309 v\u00e2\u0323t li\u00ea\u0323u cha\u0301y (VLC) \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh th\u1eddi \u0111i\u1ec3m b\u00e9n l\u1eeda Sc (s) th\u1eddi gian ch\u00e1y Tc (ph\u00fat\/m2 ) v\u00e0 chi\u1ec1u cao ng\u1ecdn l\u1eeda Hc (m) c\u1ee7a \u0111\u00e1m VLC v\u00e0 s\u1ef1 lan truy\u1ec1n c\u1ee7a \u0111\u00e1m ch\u00e1y. K\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u \u0111\u00e3 xa\u0301c \u0111i\u0323nh \u0111\u01b0\u1ee3c c\u00e1c \u0111\u1eb7c tr\u01b0ng l\u00e2m ph\u1ea7n \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn ch\u00e1y r\u1eebng nh\u01b0: m\u1eadt \u0111\u1ed9, \u0111\u1ed9 t\u00e0n che, chi\u1ec1u cao v\u00fat ng\u1ecdn, \u0111\u01b0\u1eddng k\u00ednh th\u00e2n, \u0111\u01b0\u1eddng k\u00ednh t\u00e1n. Kh\u1ed1i l\u01b0\u1ee3ng v\u00e2\u0323t li\u00ea\u0323u cha\u0301y l\u01a1\u0301n nh\u00e2\u0301t \u1edf tr\u1ea1ng th\u00e1i r\u1eebng th\u01b0\u1eddng xanh gi\u00e0u va\u0300o tha\u0301ng 1 (10,4 \u00b1 1,09 t\u1ea5n\/ha), t\u0103ng d\u00e2\u0300n v\u00e0o c\u00e1c th\u00e1ng cu\u1ed1i m\u00f9a ch\u00e1y; \u0111\u1ed9 d\u00e0y v\u00e2\u0323t li\u00ea\u0323u cha\u0301y dao \u0111\u1ed9ng t\u1eeb 2,1\u00b10,16 \u0111\u1ebfn 3,3\u00b10,13 cm, cao nh\u1ea5t l\u00e0 tr\u1ea1ng th\u00e1i r\u1eebng th\u01b0\u1eddng xanh gi\u00e0u; \u0111\u1ed9 \u1ea9m v\u1eadt li\u1ec7u ch\u00e1y th\u1eddi \u0111i\u1ec3m th\u00e1ng 1 giao \u0111\u1ed9ng t\u1eeb 10,2\u00b10,31 \u0111\u1ebfn 30,7\u00b10,68%, gi\u1ea3m d\u1ea7n v\u00e0o c\u00e1c th\u00e1ng cu\u1ed1i m\u00f9a ch\u00e1y. Nguy c\u01a1 ch\u00e1y theo \u0111\u1ed9 \u1ea9m v\u00e2\u0323t li\u00ea\u0323u cha\u0301y, tr\u1ea1ng th\u00e1i r\u1eebng l\u1ed3 \u00f4 – tre n\u1ee9a c\u00f3 nguy c\u01a1 cao nh\u1ea5t, thu\u1ed9c ph\u00e2n c\u1ea5p nguy c\u01a1 ch\u00e1y cao \u0111\u1ebfn r\u1ea5t cao; h\u1ec7 s\u1ed1 kh\u1ea3 n\u0103ng b\u1eaft ch\u00e1y c\u1ee7a v\u1eadt li\u1ec7u ch\u00e1y (K) \u1edf 8 tr\u1ea1ng th\u00e1i r\u1eebng \u1edf m\u1ee9c cao (> 0,8); \u0111\u1ed1t th\u1eed nghi\u1ec7m v\u00e2\u0323t li\u00ea\u0323u cha\u0301y \u1edf 3 m\u00f4 h\u00ecnh cho th\u1ea5y, v\u1eadt li\u1ec7u ch\u00e1y c\u00f3 kh\u1ea3 n\u0103ng b\u1eaft l\u1eeda nhanh v\u00e0 t\u1ed1c \u0111\u1ed9 lan truy\u1ec1n \u0111\u00e1m ch\u00e1y l\u1edbn, \u0111\u1eb7c bi\u1ec7t l\u00e0 tr\u1ea1ng th\u00e1i r\u1eebng l\u1ed3 \u00f4 – tre n\u1ee9a.<\/p>\n

T\u1eeb kh\u00f3a: Ch\u00e1y r\u1eebng, nguy c\u01a1 ch\u00e1y r\u1eebng, t\u1ec9nh \u0110\u1ed3ng Nai, v\u1eadt li\u1ec7u ch\u00e1y r\u01b0\u0300ng<\/p>\n

Flammable materials characteristics and forest fire risk: case study in Dong Nai province<\/strong><\/p>\n

The article summarizes the results of determining the characteristics of flammable materials and the forest fire risk as a basis for proposing solutions for fire prevention in Dong Nai province. Data were collected from 50 sample plots with an area of 500 m2 in 8 forest types with high fire risk from January to April 2020. Experimental burning of flammable materials to determine the flash point Sc (s), the burning time Tc (min\/m2 ), the fire height Hc (m) and the spread of the fire. The results have determined the characteristics of forest stands affecting on forest fires such as: tree density, canopy, top height, DBH, and canopy diameter. The largest volume of flammable material in rich evergreen forest was the highest in January (10.14 \u00b1 1.09 ton\/ha), increasing gradually during the fire season; The thickness of the flammable materials ranged from 2.1\u00b10.16 to 3.3\u00b10.13 cm, the highest was in rich evergreen forest; The moisture of flammable materials in January was ranged from 10.2\u00b10.31% to 30.7\u00b10.68% and decreasing gradually during the fire season. Assessing the forest fire risk based on flammable materials moisture, bamboo forest type has the highest forest fire risk, belonging to the fire risk class from high to very high; The flammability coefficient (K) in 08 forest types was very high ( >0.8); Experimental burning of flammable materials in 03 models showed that the these materials had the ability to ignite quickly and spread rapidly, especially in the bamboo forest.<\/p>\n

Keywords: Forest fire, forest fire risk, Dong Nai province, forest flammable materials<\/p>\n

NGHI\u00caN C\u1ee8U PH\u00d2NG CH\u1ed0NG B\u1ec6NH CH\u00c1Y L\u00c1 B\u1ea0CH \u0110\u00c0N DO N\u1ea4M Cryptosporiopsis eucalypti<\/em><\/strong><\/p>\n

B\u00f9i \u0110\u1ee9c Giang1 , L\u00ea Th\u1ecb Xu\u00e2n2 , Tr\u1ea7n Xu\u00e2n Hinh2 <\/strong><\/p>\n

1 Vi\u1ec7n Nghi\u00ean c\u1ee9u C\u00e2y nguy\u00ean li\u1ec7u gi\u1ea5y <\/em><\/p>\n

2 Trung t\u00e2m Nghi\u00ean c\u1ee9u B\u1ea3o v\u1ec7 r\u1eebng \u2013 Vi\u1ec7n Khoa h\u1ecdc L\u00e2m nghi\u1ec7p Vi\u1ec7t Nam<\/em><\/p>\n

T\u00d3M T\u1eaeT<\/p>\n

B\u1ea1ch \u0111\u00e0n \u0111\u01b0\u1ee3c tr\u1ed3ng ph\u1ed5 bi\u1ebfn t\u1ea1i mi\u1ec1n B\u1eafc Vi\u1ec7t Nam ph\u1ee5c v\u1ee5 cho nguy\u00ean li\u1ec7u l\u00e0m gi\u1ea5y v\u00e0 v\u00e1n d\u0103m. Tuy nhi\u00ean, nh\u1eefng n\u0103m g\u1ea7n \u0111\u00e2y, nhi\u1ec1u lo\u00e0i n\u1ea5m b\u1ec7nh g\u00e2y h\u1ea1i r\u1eebng tr\u1ed3ng b\u1ea1ch \u0111\u00e0n, l\u00e0m \u1ea3nh h\u01b0\u1edfng l\u1edbn t\u1edbi sinh tr\u01b0\u1edfng. Trong \u0111\u00f3, \u0111\u1eb7c bi\u1ec7t nghi\u00eam tr\u1ecdng l\u00e0 b\u1ec7nh ch\u00e1y l\u00e1 do n\u1ea5m Cryptosporiopsis eucalypti. Nghi\u00ean c\u1ee9u n\u00e0y \u0111\u00e3 \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n nh\u1eb1m \u0111\u00e1nh gi\u00e1 m\u1ee9c ch\u1ed1ng ch\u1ecbu c\u1ee7a 19 gi\u1ed1ng b\u1ea1ch \u0111\u00e0n \u0111\u1ed1i v\u1edbi n\u1ea5m C. eucalypti v\u00e0 kh\u1ea3 n\u0103ng ph\u00f2ng tr\u1eeb c\u1ee7a c\u00e1c lo\u1ea1i thu\u1ed1c h\u00f3a h\u1ecdc v\u00e0 sinh h\u1ecdc \u0111\u1ed1i v\u1edbi n\u1ea5m g\u00e2y b\u1ec7nh ch\u00e1y l\u00e1 b\u1ea1ch \u0111\u00e0n. K\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u x\u00e1c \u0111\u1ecbnh \u0111\u01b0\u1ee3c 4 gi\u1ed1ng (DH32-29, H1, PN108 v\u00e0 PN3d) c\u00f3 kh\u1ea3 n\u0103ng ch\u1ed1ng ch\u1ecbu r\u1ea5t m\u1ea1nh v\u00e0 8 gi\u1ed1ng (DH32-13, NC3, PNCTIV, DH32-26, DH32-27, QY23, U16 v\u00e0 PN24) ch\u1ed1ng ch\u1ecbu m\u1ea1nh, 2 gi\u1ed1ng PN54, U6 c\u00f3 m\u1ee9c ch\u1ed1ng ch\u1ecbu y\u1ebfu, gi\u1ed1ng PN14 m\u1eabn c\u1ea3m v\u1edbi n\u1ea5m C. eucalypti. K\u1ebft qu\u1ea3 th\u00ed nghi\u1ec7m cho th\u1ea5y 2 lo\u1ea1i thu\u1ed1c h\u00f3a h\u1ecdc c\u00f3 kh\u1ea3 n\u0103ng \u1ee9c ch\u1ebf n\u1ea5m g\u00e2y b\u1ec7nh r\u1ea5t m\u1ea1nh l\u00e0 Zineb v\u00e0 Chlorothalonil, 2 lo\u1ea1i thu\u1ed1c sinh h\u1ecdc Cytosinpeptidemycin v\u00e0 Oligo chitosan c\u00f3 kh\u1ea3 n\u0103ng \u1ee9c ch\u1ebf m\u1ea1nh \u0111\u1ed1i v\u1edbi n\u1ea5m C. eucalypti g\u00e2y b\u1ec7nh ch\u00e1y l\u00e1. T\u1eeb k\u1ebft qu\u1ea3 n\u00e0y c\u00f3 th\u1ec3 khuy\u1ebfn c\u00e1o s\u1eed d\u1ee5ng c\u00e1c gi\u1ed1ng ch\u1ed1ng ch\u1ecbu trong tr\u1ed3ng r\u1eebng v\u00e0 s\u1eed d\u1ee5ng b\u1ed1n lo\u1ea1i thu\u1ed1c n\u00eau tr\u00ean \u0111\u1ec3 h\u1ea1n ch\u1ebf b\u1ec7nh ch\u00e1y l\u00e1 b\u1ea1ch \u0111\u00e0n do n\u1ea5m C. eucalypti.<\/p>\n

T\u1eeb kh\u00f3a: B\u1ea1ch \u0111\u00e0n, ph\u00f2ng tr\u1eeb, Cryptosporiopsis eucalypti<\/em><\/p>\n

Control of Cryptosporiopsis eucalypti<\/em> causing leaf blight disease on Eucalyptus<\/strong><\/p>\n

Eucalyptus spp. is widely grown in the Northern Vietnam to serve as materials for paper and chipboard. However, in recent years, many pathogens have damaged Eucalyptus plantations, greatly affecting the growth. In which, especially serious is leaf blight caused by Cryptosporiopsis eucalypti<\/em>. The aim of this study is to evaluate the tolerance of 19 Eucalyptus clones to C. eucalypti, and the control ability of chemical and biological agents to against this pathogen. This results showed four clones (DH32-29, H1, PN108 and PN3d) with very strong tolerance; eight clones (DH32-13, NC3, PNCTIV, DH32-26, DH32-27, QY23, U16, and PN24) have strong tolerance; two clones PN54 and U6 have weak tolerance, clone PN14 was susceptible. Two chemical agents Zineb and Chlorothalonil had the ability to inhibit C. eucalypti<\/em> very strongly, and two biological agents Cytosinpeptidemycin<\/em> and Oligo chitosan had strong inhibitory ability. From these results, it can be recommended to prioritize the use of resistant varieties in afforestation and the above chemical and biological agents for management of this pathogen.<\/p>\n

Keywords: Control, eucalyptus, Cryptosporiopsis eucalypti<\/em><\/p>\n

T\u00ccNH H\u00ccNH G\u00c2Y H\u1ea0I, \u0110\u1eb6C \u0110I\u1ec2M SINH H\u1eccC C\u1ee6A LO\u00c0I S\u00c2U \u0102N L\u00c1 (Eurema blanda<\/em> Boisduval, 1836 ) H\u1ea0I KEO LAI V\u00c0 KEO TAI T\u01af\u1ee2NG T\u1ea0I T\u1ec8NH QU\u1ea2NG NAM<\/strong><\/p>\n

Tr\u1ea7n Vi\u1ebft Th\u1eafng, L\u00ea Th\u1ecb Xu\u00e2n, Trang A T\u1ed5ng<\/strong><\/p>\n

\u00a0Trung t\u00e2m Nghi\u00ean c\u1ee9u B\u1ea3o v\u1ec7 r\u1eebng – Vi\u1ec7n Khoa h\u1ecdc L\u00e2m nghi\u1ec7p Vi\u1ec7t Nam<\/em><\/p>\n

T\u00d3M T\u1eaeT<\/p>\n

Keo lai v\u00e0 Keo tai t\u01b0\u1ee3ng l\u00e0 nh\u1eefng c\u00e2y l\u00e2m nghi\u1ec7p ch\u00ednh \u0111\u01b0\u1ee3c tr\u1ed3ng t\u1ea1i t\u1ec9nh Qu\u1ea3ng Nam. Tuy nhi\u00ean, hi\u1ec7n nay t\u1ea1i r\u1eebng tr\u1ed3ng keo \u1edf 6 huy\u1ec7n t\u1ea1i t\u1ec9nh Qu\u1ea3ng Nam \u0111ang b\u1ecb lo\u00e0i s\u00e2u \u0103n l\u00e1 c\u00f3 t\u00ean khoa h\u1ecdc l\u00e0 Eurema blanda (Boisduval, 1836) thu\u1ed9c gi\u1ed1ng Eurema, h\u1ecd Pieridae, b\u1ed9 C\u00e1nh v\u1ea3y Lepidoptera g\u00e2y h\u1ea1i. R\u1eebng tr\u1ed3ng Keo tai t\u01b0\u1ee3ng c\u00f3 t\u1ef7 l\u1ec7 v\u00e0 m\u1ee9c \u0111\u1ed9 b\u1ecb h\u1ea1i cao h\u01a1n \u0111\u1ed1i v\u1edbi r\u1eebng keo lai. Tr\u01b0\u1edfng th\u00e0nh c\u00e1i c\u00f3 chi\u1ec1u d\u00e0i th\u00e2n trung b\u00ecnh 14,2 mm (\u00b10,2); m\u1eb7t tr\u00ean c\u00e1nh tr\u01b0\u1edbc m\u00e0u v\u00e0ng cam \u0111\u1eadm, m\u1eb7t d\u01b0\u1edbi c\u00e1nh tr\u01b0\u1edbc c\u00f3 b\u1ed1n v\u1ec7t \u0111en nh\u1ecf k\u00edch th\u01b0\u1edbc kh\u00f4ng \u0111\u1ec1u (v\u1ec7t l\u1edbn nh\u1ea5t c\u00f3 \u0111\u01b0\u1eddng ranh gi\u1edbi m\u00e0u t\u1ed1i, ph\u00eda trong v\u1ec7t c\u00f3 m\u00e0u s\u1eafc l\u00e0 m\u00e0u n\u1ec1n c\u1ee7a c\u00e1nh), c\u00e1c v\u1ec7t \u0111en x\u1ebfp th\u1eb3ng h\u00e0ng n\u1eb1m song song so v\u1edbi m\u00e9p tr\u00ean c\u1ee7a c\u00e1nh tr\u01b0\u1edbc; m\u1eb7t tr\u00ean c\u00e1nh sau m\u00e0u v\u00e0ng c\u00f3 vi\u1ec1n c\u00e1nh m\u00e0u \u0111en nh\u1ecf \u1edf m\u00e9p ngo\u00e0i; m\u1eb7t d\u01b0\u1edbi c\u00e1nh sau c\u00f3 c\u00e1c v\u1ec7t \u0111en, k\u00edch th\u01b0\u1edbc kh\u00f4ng \u0111\u1ec1u, s\u1ed1 l\u01b0\u1ee3ng nhi\u1ec1u h\u01a1n m\u1eb7t d\u01b0\u1edbi c\u00e1nh tr\u01b0\u1edbc, ph\u00e2n b\u1ed1 \u0111\u1ec1u m\u1eb7t d\u01b0\u1edbi c\u00e1nh sau, m\u00e9p ngo\u00e0i c\u00e1nh c\u00f3 c\u00e1c ch\u1ea5m \u0111en nh\u1ecf n\u1eb1m tr\u00ean g\u00e2n c\u00e1nh. Tr\u01b0\u1edfng th\u00e0nh \u0111\u1ef1c c\u00f3 k\u00edch th\u01b0\u1edbc nh\u1ecf h\u01a1n tr\u01b0\u1edfng th\u00e0nh c\u00e1i v\u1edbi chi\u1ec1u d\u00e0i th\u00e2n trung b\u00ecnh 13,5 mm (\u00b1 0,2). Ph\u1ea7n c\u00e1nh c\u00f3 c\u1ea5u tr\u00fac v\u00e0 m\u00e0u s\u1eafc gi\u1ed1ng nh\u01b0 tr\u01b0\u1edfng th\u00e0nh c\u00e1i nh\u01b0ng c\u00e1c vi\u1ec1n \u0111en nh\u1ecf h\u01a1n v\u00e0 nh\u1ea1t h\u01a1n, b\u1ee5ng tr\u01b0\u1edfng th\u00e0nh \u0111\u1ef1c d\u00e0i v\u00e0 nh\u1ecdn h\u01a1n. Tr\u1ee9ng h\u00ecnh b\u1ea7u d\u1ee5c, d\u00e0i trung b\u00ecnh 1,2 mm (\u00b1 0,2), m\u00e0u tr\u1eafng s\u1eefa. S\u00e2u non c\u00f3 5 tu\u1ed5i, c\u00f3 3 \u0111\u00f4i ch\u00e2n ng\u1ef1c v\u00e0 5 \u0111\u00f4i ch\u00e2n b\u1ee5ng. S\u00e2u non t\u1eeb tu\u1ed5i 1 \u0111\u1ebfn tu\u1ed5i 5 c\u00f3 chi\u1ec1u d\u00e0i c\u01a1 th\u1ec3 trung b\u00ecnh l\u1ea7n l\u01b0\u1ee3t l\u00e0 0,3 mm (\u00b1 0,1); 9,4 mm (\u00b1 0,3); 14,6 mm (\u00b1 0,3); 21,3 mm (\u00b1 0,2) v\u00e0 26,6 mm (\u00b1 0,2). Nh\u1ed9ng l\u00e0 d\u1ea1ng nh\u1ed9ng m\u00e0ng, c\u00f3 m\u00f3c b\u00e1m, chi\u1ec1u d\u00e0i trung b\u00ecnh 17,2 mm (\u00b1 0,3).<\/p>\n

T\u1eeb kh\u00f3a: Eurema blanda, keo lai, Keo tai t\u01b0\u1ee3ng<\/p>\n

Damage status and some biology characteristics of Eurema blanda<\/em> (Boisduval, 1836) leaf eating acacia hybrid and Acacia mangium<\/em> Wild. in Quang Nam province<\/strong><\/p>\n

Acacia hybrid and Acacia mangium<\/em> are the main forestry trees in Quang Nam province. However, at present, acacia plantation in 6 districts in Quang Nam province are being damaged by leaf-eating caterpillars with scientific name Eurema blanda<\/em> (Boisduval, 1836) belonged to genus Eurema, family Pieridae, order of Lepidoptera. Acacia mangium<\/em> plantations have a higher rate and degree of damage than acacia hybrids. The average body long female is 14.2 mm (\u00b1 0.2), the upper wing surface dark orange-yellow, the underside of the forewing has 4 small black streaks, irregular shape and size that parallel to the upper edge of the forewing; The upper surface of the hindwing is yellow with a small black margin on the outer edge, the underside has evenly spaced black streaks on the wing surface and a small black streak on the outer edge of the wing. Male are smaller than female with an average body long of 13.5 mm (\u00b1 0.2), the wings are the same as female\u2019s wings but the black border is smaller and lighter, the abdomen of male is longer and more pointed than female. Eggs oval-shaped, average long 1.2 mm (\u00b1 0.2), white milk. Larva goes through five instars, that have 3 pairs of thoracic legs and 5 pairs of ventral legs, larva from the firts to the fifth instar have an average body long of 0.3 mm (\u00b1 0.1); 9.4 mm (\u00b1 0.3); 14.6 mm (\u00b1 0.3); 21.3 mm (\u00b1 0.2) and 26.6 mm (\u00b1 0.2) . Pupae are on average length 17.2 mm (\u00b1 0.3).<\/p>\n

Keywords: Acacia hybrids, Acacia mangium<\/em>, Eurema blanda<\/em>.<\/p>\n

TH\u00c0NH PH\u1ea6N B\u1ec6NH H\u1ea0I C\u00c2Y SA M\u1ed8C (Cunninghamia lanceolata<\/em> Lamb.) T\u1ea0I M\u1ed8T S\u1ed0 T\u1ec8NH MI\u1ec0N B\u1eaeC VI\u1ec6T NAM<\/strong><\/p>\n

Nguy\u1ec5n Ho\u00e0i Thu, \u0110\u1eb7ng Nh\u01b0 Qu\u1ef3nh, Tr\u1ea7n Nh\u1eadt T\u00e2n, Trang A T\u1ed5ng, Nguy\u1ec5n Th\u1ecb Minh H\u1eb1ng <\/strong><\/p>\n

Trung t\u00e2m Nghi\u00ean c\u1ee9u B\u1ea3o v\u1ec7 r\u1eebng – Vi\u1ec7n Khoa h\u1ecdc L\u00e2m nghi\u1ec7p Vi\u1ec7t Nam<\/em><\/p>\n

T\u00d3M T\u1eaeT<\/p>\n

T\u1ea1i Vi\u1ec7t Nam, c\u00e2y Sa m\u1ed9c c\u00f3 ph\u00e2n b\u1ed1 ch\u1ee7 y\u1ebfu \u1edf v\u00f9ng mi\u1ec1n n\u00fai ph\u00eda B\u1eafc nh\u01b0 H\u00e0 Giang, L\u00e0o Cai… T\u1ea1i Vi\u1ec7t Nam, r\u1eebng Sa m\u1ed9c l\u00e0 c\u00e2y m\u1ecdc t\u1ef1 nhi\u00ean v\u00e0 c\u00e2y nh\u1eadp t\u1eeb Trung Qu\u1ed1c v\u00e0o tr\u1ed3ng \u1edf n\u01b0\u1edbc ta trong nh\u1eefng n\u0103m g\u1ea7n \u0111\u00e2y. \u0110i\u1ec1u tra thu th\u1eadp v\u00e0 ph\u00e2n l\u1eadp sinh v\u1eadt g\u00e2y b\u1ec7nh h\u1ea1i tr\u00ean c\u00e2y Sa M\u1ed9c t\u1ea1i t\u1ec9nh H\u00e0 Giang v\u00e0 t\u1ec9nh L\u00e0o Cai thu \u0111\u01b0\u1ee3c 8 lo\u00e0i b\u1ec7nh h\u1ea1i do 8 lo\u00e0i sinh v\u1eadt g\u00e2y b\u1ec7nh kh\u00e1c nhau g\u00e2y n\u00ean. Trong \u0111\u00f3 h\u1ecd Trentepohliaceae c\u00f3 2 lo\u00e0i; h\u1ecd Rhytismataceae c\u00f3 1 lo\u00e0i; h\u1ecd Pleosporaceae c\u00f3 1 lo\u00e0i; h\u1ecd Glomerellaceae c\u00f3 2 lo\u00e0i; h\u1ecd Sporocadaceae c\u00f3 2 lo\u00e0i. T\u1ef7 l\u1ec7 b\u1ecb b\u1ec7nh trung b\u00ecnh c\u1ee7a c\u00e1c lo\u00e0i b\u1ec7nh h\u1ea1i dao \u0111\u1ed9ng 6,9 – 42,5% v\u1edbi m\u1ee9c \u0111\u1ed9 b\u1ecb b\u1ec7nh trung b\u00ecnh 0,01-1,08. Trong s\u1ed1 8 lo\u00e0i lo\u00e0i \u0111\u00e3 ghi nh\u1eadn, b\u1ec7nh th\u1ed1i ng\u1ecdn (Curvularia lunata ) c\u00f3 m\u1ee9c \u0111\u1ed9 b\u1ecb b\u1ec7nh cao nh\u1ea5t (R = 1,08) v\u00e0 \u0111ang c\u00f3 xu h\u01b0\u1edbng lan r\u1ed9ng.<\/p>\n

T\u1eeb kh\u00f3a: C\u00e2y Sa m\u1ed9c, sinh v\u1eadt g\u00e2y b\u1ec7nh, t\u1ef7 l\u1ec7 h\u1ea1i, m\u1ee9c \u0111\u1ed9 h\u1ea1i<\/p>\n

The disease on China fir (Cunninghamia lanceolata<\/em> Lamb.) in several provinces in the North of Vietnam<\/strong><\/p>\n

In Vietnam, the China Fir is distributed mainly in the Northern mountainous areas such as Ha Giang, Lao Cai. Its natural distribution is in Vietnam, and also are imported from China to planted in the past few years. Investigating, collecting and isolating pathogenic organims on China Fir in Ha Giang and Lao Cai provinces, the result obtained eight diseases caused by eight different species of pathogenic organims. In which, two species belong to Trentepohliaceae; two species belong to Glomerellaceae; two species belong to Sporocadaceae, and each family Rhytismataceae and Pleosporaceae have recorded one species. The disease incidence and average disease severity (R) are 6.9 – 42.5% and 0.01 – 1.08, respectively. Among the eight pathogenic organims species that have been recorded, only Curvularia lunata has the highest average disease severity (R=1.08) and are trending to spread.<\/p>\n

Keywords: China Fir, pathogenic organisms, disease incidence, disease severity<\/p>\n

\u0110I\u1ec0U KI\u1ec6N SINH TR\u01af\u1edeNG PH\u00c1T TRI\u1ec2N C\u1ee6A S\u00c1U CH\u1ee6NG VI KHU\u1ea8N SINH M\u00c0NG NH\u1ea6Y V\u00c0 \u1ee8NG D\u1ee4NG NH\u1eb0M T\u0102NG \u0110\u1ed8 \u1ea8M V\u1edaI V\u1eacT LI\u1ec6U CH\u00c1Y<\/strong><\/p>\n

V\u0169 V\u0103n \u0110\u1ecbnh, Ph\u1ea1m V\u0103n Nh\u1eadt, Tr\u1ea7n Nh\u1eadt T\u00e2n <\/strong><\/p>\n

Trung t\u00e2m Nghi\u00ean c\u1ee9u B\u1ea3o v\u1ec7 r\u1eebng – Vi\u1ec7n Khoa h\u1ecdc L\u00e2m nghi\u1ec7p Vi\u1ec7t Nam<\/em><\/p>\n

T\u00d3M T\u1eaeT<\/p>\n

S\u00e1u ch\u1ee7ng vi khu\u1ea9n sinh m\u00e0ng nh\u1ea7y c\u00f3 h\u00e0m l\u01b0\u1ee3ng polysacarit cao bao g\u1ed3m: ch\u1ee7ng P08, P16.1, P09, P36 (Bacillus aryabhattai), P54.1 (Paenibacillus polymyxa) v\u00e0 ch\u1ee7ng P73 (Paenibacillus jamilae) c\u00f3 th\u1ec3 t\u1ed3n t\u1ea1i \u1edf nhi\u1ec7t \u0111\u1ed9 t\u1eeb 5 \u0111\u1ebfn 40o C, song c\u00e1c ch\u1ee7ng vi khu\u1ea9n sinh tr\u01b0\u1edfng t\u1ed1t nh\u1ea5t \u1edf nhi\u1ec7t \u0111\u1ed9 t\u1eeb 25 \u0111\u1ebfn 30o C. Ch\u1ee7ng P54.1 (Paenibacillus polymyxa), P73 (Paenibacillus jamilae) sinh tr\u01b0\u1edfng t\u1ed1i \u01b0u \u1edf \u0111\u1ed9 \u1ea9m 90%; c\u00e1c ch\u1ee7ng P08, P09, P16.1, P36 (Bacillus aryabhattai) c\u00f3 \u0111\u1ed9 \u1ea9m t\u1ed1i \u01b0u l\u00e0 80%. C\u1ea3 6 ch\u1ee7ng vi khu\u1ea9n sinh m\u00e0ng nh\u1ea7y \u0111\u01b0\u1ee3c th\u00ed nghi\u1ec7m v\u1edbi v\u1eadt li\u1ec7u ch\u00e1y (l\u00e1 th\u00f4ng kh\u00f4) trong \u0111i\u1ec1u ki\u1ec7n ch\u1eadu v\u1ea1i, sau 2 th\u00e1ng \u0111\u1ed9 \u1ea9m c\u1ee7a v\u1eadt li\u1ec7u ch\u00e1y cao h\u01a1n 14,5 – 16,3% so v\u1edbi \u0111\u1ed1i ch\u1ee9ng.<\/p>\n

T\u1eeb kh\u00f3a: Th\u00f4ng, vi khu\u1ea9n sinh m\u00e0ng nh\u1ea7y, h\u00e0m l\u01b0\u1ee3ng polysaccarit, v\u1eadt li\u1ec7u ch\u00e1y<\/p>\n

Conditions for growth and development of 6 strains of mucous membranes production bacteria and application to increase humidity of flammable material<\/strong><\/p>\n

Six strains of mucous membranes production bacteria with high polysaccharide include P08, P16.1, P09, P36 (Bacillus aryabhattai), P54.1 (Paenibacillus polymyxa) and P73 (Paenibacillus jamilae) can survive at temperatures from 5 to 40\u00b0C, but the best temperature for bacteria growth from 25 to 30\u00b0C. Strains P54.1 (Paenibacillus polymyxa) and P73 (Paenibacillus jamilae) have the optimal growth humidity content of 90%, meanwhile, the optimal growth humidity of strains of P08, P09, P16.1, P36 (Bacillus aryabhattai) were at 80%. Six strains were also further experimented with dried pine leaves under potted conditions, after 2 months, its moisture was increased higher 14.5 – 16.3% in comparing with the control sample.<\/p>\n

Keywords: Pinus, mucous membranes production bacteria, polysaccharide content, flammable material<\/p>\n

NGHI\u00caN C\u1ee8U QUY TR\u00ccNH T\u1ea8Y TR\u1eaeNG G\u1ed6 B\u1ed2 \u0110\u1ec0 CHO S\u1ea2N XU\u1ea4T COMPOSITE G\u1ed6 NH\u1ef0A TH\u1ea4U QUANG<\/strong><\/p>\n

Nguy\u1ec5n Th\u1ecb Tr\u1ecbnh1 , Nguy\u1ec5n Th\u1ecb Minh Ph\u01b0\u01a1ng2 , Nguy\u1ec5n B\u1ea3o Ng\u1ecdc1 <\/strong><\/p>\n

1 Vi\u1ec7n Nghi\u00ean c\u1ee9u C\u00f4ng nghi\u1ec7p r\u1eebng, Vi\u1ec7n Khoa h\u1ecdc L\u00e2m nghi\u1ec7p Vi\u1ec7t Nam <\/em><\/p>\n

2 Tr\u01b0\u1eddng \u0110\u1ea1i h\u1ecdc B\u00e1ch khoa H\u00e0 N\u1ed9i<\/em><\/p>\n

T\u00d3M T\u1eaeT<\/p>\n

G\u1ed7 nh\u1ef1a th\u1ea5u quang l\u00e0 lo\u1ea1i v\u1eadt li\u1ec7u h\u1ea5p d\u1eabn, thu h\u00fat \u0111\u01b0\u1ee3c nhi\u1ec1u s\u1ef1 ch\u00fa \u00fd c\u1ee7a gi\u1edbi khoa h\u1ecdc trong nh\u1eefng n\u0103m tr\u1edf l\u1ea1i \u0111\u00e2y do nh\u1eefng \u1ee9ng d\u1ee5ng \u0111\u1ea7y ti\u1ec1m n\u0103ng c\u1ee7a ch\u00fang trong x\u00e2y d\u1ef1ng, n\u1ed9i, ngo\u1ea1i th\u1ea5t v\u00e0 l\u00e0m v\u1eadt li\u1ec7u trang tr\u00ed. So v\u1edbi g\u1ed7 th\u00f4ng d\u1ee5ng, g\u1ed7 nh\u1ef1a th\u1ea5u quang c\u00f3 nhi\u1ec1u \u0111\u1eb7c t\u00ednh c\u01a1 h\u1ecdc \u0111\u01b0\u1ee3c c\u1ea3i thi\u1ec7n h\u01a1n nh\u01b0 \u0111\u1ed9 b\u1ec1n c\u01a1 l\u00fd, s\u1ef1 co ng\u00f3t, kh\u1ea3 n\u0103ng h\u00fat n\u01b0\u1edbc. Ngo\u00e0i ra composite g\u1ed7 nh\u1ef1a th\u1ea5u quang c\u00f2n c\u00f3 kh\u1ea3 n\u0103ng ph\u00e2n h\u1ee7y sinh h\u1ecdc n\u00ean th\u00e2n thi\u1ec7n v\u1edbi m\u00f4i tr\u01b0\u1eddng h\u01a1n. B\u00e0i b\u00e1o tr\u00ecnh b\u00e0y qu\u00e1 tr\u00ecnh x\u1eed l\u00fd h\u00f3a h\u1ecdc \u0111\u01a1n gi\u1ea3n g\u1ed7 B\u1ed3 \u0111\u1ec1 theo hai c\u00f4ng \u0111o\u1ea1n b\u1eb1ng t\u00e1c nh\u00e2n sunfat (NaOH + Na2S) v\u00e0 b\u1eb1ng (CH3COOH+H2O2). M\u1eabu g\u1ed7 \u0111\u00e3 t\u1ea9y tr\u1eafng \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh h\u00e0m l\u01b0\u1ee3ng lignin \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh hi\u1ec7u qu\u1ea3 c\u1ee7a qu\u00e1 tr\u00ecnh t\u00e1ch lo\u1ea1i lignin v\u00e0 ph\u00e2n t\u00edch h\u00ecnh th\u00e1i b\u1eb1ng \u1ea3nh SEM. Nghi\u00ean c\u1ee9u qu\u00e1 tr\u00ecnh x\u1eed l\u00fd g\u1ed7 b\u1eb1ng ph\u01b0\u01a1ng ph\u00e1p h\u00f3a h\u1ecdc s\u1ebd th\u00fac \u0111\u1ea9y nh\u1eefng hi\u1ec3u bi\u1ebft s\u00e2u s\u1eafc h\u01a1n v\u1ec1 ch\u1ebf bi\u1ebfn g\u1ed7, gi\u00fap qu\u00e1 tr\u00ecnh n\u00e0y c\u00f3 th\u1ec3 tri\u1ec3n khai \u0111\u01b0\u1ee3c \u1edf quy m\u00f4 l\u1edbn h\u01a1n quy m\u00f4 ph\u00f2ng th\u00ed nghi\u1ec7m.<\/p>\n

T\u1eeb kh\u00f3a: G\u1ed7 B\u1ed3 \u0111\u1ec1, g\u1ed7 nh\u1ef1a th\u1ea5u quang, t\u1ea9y tr\u1eafng g\u1ed7, hydrogen peroxit, axit axetic<\/p>\n

Research on the process of bleaching Styrax tonkinensis<\/em> (Pierre) wood for the production of transparent wood<\/strong><\/p>\n

Transparent wood is an attractive material, attracting a lot of attention from the scientific community in recent years due to its potential applications in construction, interior and decorative materials. Compared with common wood, transparent wood has many improved mechanical properties such as mechanical strength, water uptake. Transparent wood is generally presumed to be inherently more resistant to moisture uptake than solid wood. In addition, wood-plastic composite is biodegradable, so it is more environmentally friendly. This paper presents a simple chemical treatment of Styrax tonkinensis wood in two stages with sulfate agents (NaOH + Na2S) and with (CH3COOH+H2O2). Bleached wood samples were determined for lignin content to determine the efficiency of the lignin removal process and morphological analysis by SEM images. Studying the chemical treatment of wood will advance insights into chemical treatment wood, making it possible to deploy on a larger scale than the laboratory scale<\/p>\n

Keywords: Styrax tonkinensis<\/em> (Pierre), transparent wood, bleaching wood, hydrogen peroxide, acid acetic<\/p>\n

M\u1ed8T S\u1ed0 \u0110\u1eb6C \u0110I\u1ec2M C\u1ea4U T\u1ea0O \u0110\u1eb6C BI\u1ec6T \u0110\u1ec2 NH\u1eacN BI\u1ebeT G\u1ed6 SA M\u1ed8C D\u1ea6U Cunninghamia konishii<\/em> Hayata<\/strong><\/p>\n

V\u0169 Th\u1ecb H\u1ed3ng Th\u1eafm, L\u01b0u Qu\u1ed1c Th\u00e0nh, V\u0169 Th\u1ecb Ngoan, B\u00f9i H\u1eefu Th\u01b0\u1edfng <\/strong><\/p>\n

Vi\u1ec7n Nghi\u00ean c\u1ee9u C\u00f4ng nghi\u1ec7p r\u1eebng, Vi\u1ec7n Khoa h\u1ecdc L\u00e2m nghi\u1ec7p Vi\u1ec7t Nam<\/em><\/p>\n

T\u00d3M T\u1eaeT<\/p>\n

G\u1ed7 Sa m\u1ed9c d\u1ea7u Cunninghamia konishii<\/em> Hayata l\u00e0 m\u1ed9t trong nh\u1eefng lo\u1ea1i g\u1ed7 qu\u00fd hi\u1ebfm, c\u00f3 gi\u00e1 tr\u1ecb kinh t\u1ebf cao v\u00e0 n\u1eb1m trong danh s\u00e1ch nh\u1eefng lo\u00e0i th\u1ef1c v\u1eadt nguy c\u1ea5p \u1edf n\u01b0\u1edbc ta. G\u1ed7 c\u00f3 m\u00e0u ng\u00e0 v\u00e0ng, g\u1ed7 nh\u1eb9 trung b\u00ecnh, kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang 0,4 – 0,5 kg\/cm3 . G\u1ed7 c\u00f3 v\u00e2n th\u1edb \u0111\u1eb9p, m\u00f9i th\u01a1m \u0111\u1eb7c tr\u01b0ng. V\u00f2ng sinh tr\u01b0\u1edfng r\u00f5 r\u1ec7t, g\u1ed7 s\u1edbm – g\u1ed7 mu\u1ed9n ph\u00e2n bi\u1ec7t, c\u00f3 t\u1ebf b\u00e0o ch\u1ee9a tinh d\u1ea7u. Tia g\u1ed7 nh\u1ecf h\u1eb9p, ch\u1ee7 y\u1ebfu 1 d\u00e3y t\u1ebf b\u00e0o, tia g\u1ed7 kh\u00f4ng \u0111\u1ed3ng nh\u1ea5t. L\u1ed7 th\u00f4ng ngang gi\u1eefa qu\u1ea3n b\u00e0o v\u1edbi qu\u1ea3n b\u00e0o l\u00e0 l\u1ed7 th\u00f4ng ngang c\u00f3 v\u00e0nh; gi\u1eefa qu\u1ea3n b\u00e0o v\u00e0 tia l\u00e0 l\u1ed7 th\u00f4ng ngang kh\u00f4ng c\u00f3 v\u00e0nh, thu\u1ed9c lo\u1ea1i \u00edt l\u1ed7 th\u00f4ng ngang trong m\u1ed9t khoang t\u1ebf b\u00e0o (1-3 l\u1ed7 th\u00f4ng ngang trong m\u1ed9t khoang t\u1ebf b\u00e0o).<\/p>\n

T\u1eeb kh\u00f3a: C\u1ea5u t\u1ea1o g\u1ed7, g\u1ed7 Sa m\u1ed9c d\u1ea7u, Cunninghamia konishii<\/em><\/p>\n

Cunninghamia konishii<\/em> Hayata and some special anatomical characters for identification<\/strong><\/p>\n

Cunninghamia konishii<\/em> Hayata is one of the rare species, a high economical value and listed in the endangered species. Wood colour is pale yellow, medium density (0.4-0.5 g\/cm3 ), the grain is straight and beautiful. This species has a distinct aroma. Growing rings are distint, hearwood and softwood are difference. The rays are narrow, mainly one cell seriate in width, and heterogeneous in height. Perforations between tracheids and tracheids are simple and border perforations, between tracheids and rays are simple and no border perforations with 1-3 bars and a few pits in in a cell cavity.<\/p>\n

Keywords: Wood anatomy, Cunninghamia konishii<\/em> Hayata, wood indentification<\/p>\n

L\u1ef0A CH\u1eccN CH\u1ebe PH\u1ea8M PH\u00d2NG CH\u1ed0NG N\u1ea4M M\u1ed0C CHO L\u00d9NG (Bambusa longgissia<\/em> sp.nov) L\u00c0M NGUY\u00caN LI\u1ec6U \u0110\u1ec2 S\u1ea2N XU\u1ea4T H\u00c0NG TH\u1ee6 C\u00d4NG M\u1ef8 NGH\u1ec6<\/strong><\/p>\n

B\u00f9i Th\u1ecb Th\u1ee7y1 , \u0110o\u00e0n Th\u1ecb B\u00edch Ng\u1ecdc1 , Ho\u00e0ng Th\u1ecb T\u00e1m1 , Nguy\u1ec5n Th\u1ecb H\u1eb1ng1 , Phan V\u0103n Th\u1eafng2 <\/strong><\/p>\n

1 Vi\u1ec7n Nghi\u00ean c\u1ee9u C\u00f4ng nghi\u1ec7p r\u1eebng, Vi\u1ec7n Khoa h\u1ecdc L\u00e2m nghi\u1ec7p Vi\u1ec7t Nam<\/em><\/p>\n

\u00a02 Trung t\u00e2m Nghi\u00ean c\u1ee9u L\u00e2m s\u1ea3n ngo\u00e0i g\u1ed7, Vi\u1ec7n Khoa h\u1ecdc L\u00e2m nghi\u1ec7p Vi\u1ec7t Nam<\/em><\/p>\n

T\u00d3M T\u1eaeT<\/p>\n

L\u00f9ng (Bambusa longgissia<\/em> sp.nov.) c\u00f3 \u0111\u1eb7c \u0111i\u1ec3m th\u00e2n cao, tr\u00f2n \u0111\u1ec1u, l\u00f3ng d\u00e0i, m\u1eaft nh\u1ecf, t\u1ef7 l\u1ec7 m\u00f4 m\u1ec1m cao, \u0111\u1ed9 b\u1ec1n t\u00e1ch d\u1ecdc th\u1ea5p, n\u00ean d\u1ec5 gia c\u00f4ng, th\u00edch h\u1ee3p cho ch\u1ebb nan, \u0111an l\u00e1t \u0111\u1ec3 s\u1ea3n xu\u1ea5t c\u00e1c m\u1eb7t h\u00e0ng th\u1ee7 c\u00f4ng m\u1ef9 ngh\u1ec7. L\u00f9ng c\u00f3 h\u00e0m l\u01b0\u1ee3ng Pentozan cao n\u00ean r\u1ea5t d\u1ec5 b\u1ecb n\u1ea5m m\u1ed1c g\u00e2y h\u1ea1i, \u0111\u1eb7c bi\u1ec7t khi \u0111\u1ed9 \u1ea9m m\u00f4i tr\u01b0\u1eddng cao. V\u00ec v\u1eady, c\u1ea7n x\u1eed l\u00fd b\u1ea3o qu\u1ea3n L\u00f9ng t\u1eeb giai \u0111o\u1ea1n l\u01b0u tr\u1eef nguy\u00ean li\u1ec7u v\u1edbi quy tr\u00ecnh \u0111\u01a1n gi\u1ea3n, d\u1ec5 \u00e1p d\u1ee5ng, \u0111\u00e1p \u1ee9ng \u0111\u01b0\u1ee3c hi\u1ec7u qu\u1ea3 k\u1ef9 thu\u1eadt, kinh t\u1ebf v\u00e0 m\u00f4i tr\u01b0\u1eddng. M\u1ed9t s\u1ed1 ch\u1ebf ph\u1ea9m b\u1ea3o qu\u1ea3n \u0111\u00e3 \u0111\u01b0\u1ee3c nghi\u00ean c\u1ee9u \u0111\u00e1nh gi\u00e1 hi\u1ec7u l\u1ef1c ph\u00f2ng ch\u1ed1ng n\u1ea5m m\u1ed1c cho L\u00f9ng \u1edf d\u1ea1ng thanh v\u00e0 nan. K\u1ebft qu\u1ea3 cho th\u1ea5y, nguy\u00ean li\u1ec7u L\u00f9ng d\u1ea1ng thanh \u0111\u01b0\u1ee3c b\u1ea3o qu\u1ea3n b\u1eb1ng c\u00e1ch ng\u00e2m trong trong dung d\u1ecbch ch\u1ebf ph\u1ea9m LN5 n\u1ed3ng \u0111\u1ed9 5% trong th\u1eddi gian 48h; nguy\u00ean li\u1ec7u L\u00f9ng d\u1ea1ng nan \u0111\u01b0\u1ee3c b\u1ea3o qu\u1ea3n b\u1eb1ng c\u00e1ch ng\u00e2m trong dung d\u1ecbch ch\u1ebf ph\u1ea9m LN5 n\u1ed3ng \u0111\u1ed9 5% trong th\u1eddi gian 40 ph\u00fat ho\u1eb7c nh\u00fang ch\u1ebf ph\u1ea9m BORAG2\/ BORAG1 trong th\u1eddi gian 5 ph\u00fat \u0111\u1ea3m b\u1ea3o hi\u1ec7u l\u1ef1c t\u1ed1t v\u1edbi n\u1ea5m m\u1ed1c.<\/p>\n

T\u1eeb kh\u00f3a: Ch\u1ebf ph\u1ea9m b\u1ea3o qu\u1ea3n l\u00e2m s\u1ea3n, b\u1ea3o qu\u1ea3n tre L\u00f9ng, h\u00e0ng th\u1ee7 c\u00f4ng m\u1ef9 ngh\u1ec7.<\/p>\n

Selection the wood preservatives for treatment of Bambusa longgissia<\/em> sp.nov against mold for making handicraft goods<\/strong><\/p>\n

Bambusa longgissia<\/em> sp.nov has the characteristics of tall, round trunks, long internodes, small knots, high percentage of soft tissue, low longitudinal separation strength, so it is suitable for splitting, knitting to produce handicrafts. With high Pentozan content, splited bamboo and panel bamboo from Bambusa longgissia<\/em> sp.nov. are easily attacked by mold under conditions of high environmental humidity. Therefore, it is necessary to treat the raw material with preservations by simple, easy-to-apply process that ensure the technical, economic and environmental efficiency. Study effectiveness of preservatives to prevent mold for splited bamboo and panel bamboo from Bambusa longgissia<\/em> sp.nov. Panel bamboo were immersion in 48h with LN5 concentration 5%; splited bamboo were immersion in 40 minutes with LN5 concentration 5% or more, were dipped in 5 minutes or more with BORAG2\/BORAG1, deliver the performance of level 0 and 1, good – grade with mold<\/p>\n

Keywords: Forest product preservations, preserve bamboo, handicraft goods.<\/p>\n

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T\u1ea0P CH\u00cd KHOA H\u1eccC L\u00c2M NGHI\u1ec6P S\u1ed0 6 – 2021 12 \u0110\u1eb7c \u0111i\u1ec3m v\u00e0 vai tr\u00f2 c\u1ee7a v\u1ed1n x\u00e3 h\u1ed9i trong b\u1ea3o v\u1ec7 v\u00e0 ph\u00e1t tri\u1ec3n r\u1eebng c\u1ed9ng \u0111\u1ed3ng \u1edf khu v\u1ef1c B\u1eafc Trung B\u1ed9 Characteristics and effects of social capital on community forest management in the North Central Region Ng\u00f4 V\u0103n H\u1ed3ng, B\u00f9i Th\u1ebf […]<\/p>\n","protected":false},"author":12,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[26,24,45],"tags":[],"_links":{"self":[{"href":"https:\/\/vafs.gov.vn\/en\/wp-json\/wp\/v2\/posts\/2236"}],"collection":[{"href":"https:\/\/vafs.gov.vn\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/vafs.gov.vn\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/vafs.gov.vn\/en\/wp-json\/wp\/v2\/users\/12"}],"replies":[{"embeddable":true,"href":"https:\/\/vafs.gov.vn\/en\/wp-json\/wp\/v2\/comments?post=2236"}],"version-history":[{"count":4,"href":"https:\/\/vafs.gov.vn\/en\/wp-json\/wp\/v2\/posts\/2236\/revisions"}],"predecessor-version":[{"id":2241,"href":"https:\/\/vafs.gov.vn\/en\/wp-json\/wp\/v2\/posts\/2236\/revisions\/2241"}],"wp:attachment":[{"href":"https:\/\/vafs.gov.vn\/en\/wp-json\/wp\/v2\/media?parent=2236"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vafs.gov.vn\/en\/wp-json\/wp\/v2\/categories?post=2236"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vafs.gov.vn\/en\/wp-json\/wp\/v2\/tags?post=2236"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}