{"id":1735,"date":"2019-11-19T10:33:06","date_gmt":"2019-11-19T03:33:06","guid":{"rendered":"http:\/\/vafs.gov.vn\/en\/?p=1735"},"modified":"2023-11-23T12:25:29","modified_gmt":"2023-11-23T05:25:29","slug":"vietnam-journal-of-forest-science-number-3-2019","status":"publish","type":"post","link":"https:\/\/vafs.gov.vn\/en\/2019\/11\/vietnam-journal-of-forest-science-number-3-2019\/","title":{"rendered":"Vietnam Journal of Forest Science Number 3-2019"},"content":{"rendered":"

\"\"<\/a><\/p>\n

<\/a><\/a><\/a>T\u1ea0P CH\u00cd KHOA H\u1eccC L\u00c2M NGHI\u1ec6P S\u1ed0 3<\/strong> – <\/strong>201<\/strong>9<\/strong><\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
1.<\/td>\nC\u1ea5u tr\u00fac, ch\u1ea5t l\u01b0\u1ee3ng v\u00e0 \u0111a d\u1ea1ng sinh h\u1ecdc c\u00e1c th\u1ea3m th\u1ef1c v\u1eadt t\u1ea1i V\u01b0\u1eddn Qu\u1ed1c gia Ba V\u00ec, H\u00e0 N\u1ed9i<\/td>\nStructure, quality and biodiversity of forest types in
\nBa Vi National Park, Ha Noi<\/td>\n		Tr\u1ea7n Minh Phong
\nB\u00f9i M\u1ea1nh H\u01b0ng<\/td>\n		3<\/td>\n<\/tr>\n
2.<\/td>\nNghi\u00ean c\u1ee9u th\u00e0nh ph\u1ea7n th\u1ee9c \u0103n v\u00e0 m\u1ed9t s\u1ed1 t\u1eadp t\u00ednh c\u1ee7a Vo\u1ecdc ch\u00e0 v\u00e1 ch\u00e2n x\u00e1m (Pygathrix cinerea<\/em>) t\u1ea1i H\u00f2n D\u1ed3, th\u00f4n \u0110\u1ed3ng C\u1ed1, x\u00e3 Tam M\u1ef9 T\u00e2y, huy\u1ec7n N\u00fai Th\u00e0nh, t\u1ec9nh Qu\u1ea3ng Nam<\/td>\nStudy on feed ingredients
\nand some behaviors of
\ngrey-shanked douc langur (Pygathrix cinerea<\/em>) in
\nHon Do forest, Tam My Tay commune, Nui Thanh district, Quang Nam province<\/td>\n		Nguy\u1ec5n Th\u1ecb Thu Th\u1ea3o
\nL\u00ea V\u0103n Ph\u1ee5ng
\nTr\u1ea7n H\u1eefu V\u1ef9
\nTr\u1ea7n Ng\u1ecdc To\u00e0n
\nNguy\u1ec5n \u00c1i T\u00e2m<\/td>\n		13<\/td>\n<\/tr>\n
3.<\/td>\nK\u1ebft qu\u1ea3 b\u01b0\u1edbc \u0111\u1ea7u nghi\u00ean c\u1ee9u nh\u00e2n gi\u1ed1ng Gi\u1ed5i \u0103n h\u1ea1t (Michelia tonkinensis<\/em> A. Chev) b\u1eb1ng ph\u01b0\u01a1ng ph\u00e1p gi\u00e2m hom t\u1ea1i Khu B\u1ea3o t\u1ed3n thi\u00ean nhi\u00ean Xu\u00e2n Li\u00ean, t\u1ec9nh Thanh H\u00f3a<\/td>\nStudying of propagation of nut eating michelia (Michelia tonkinensis<\/em> A. Chev) by cutting method at Xuan Lien Nature Reserve, Thanh Hoa province<\/td>\n\u0110\u1ed7 Ng\u1ecdc D\u01b0\u01a1ng
\nNg\u00f4 Xu\u00e2n Minh
\nB\u00f9i Th\u1ecb Huy\u1ec1n
\nTr\u1ea7n Anh Tu\u1ea5n<\/td>\n		20<\/td>\n<\/tr>\n
4.<\/td>\nNghi\u00ean c\u1ee9u kh\u1ea3 n\u0103ng ch\u1ecbu h\u1ea1n c\u1ee7a m\u1ed9t s\u1ed1 d\u00f2ng keo lai v\u00e0 b\u1ea1ch \u0111\u00e0n trong giai \u0111o\u1ea1n v\u01b0\u01a1n \u01b0\u01a1m t\u1ea1i t\u1ec9nh Ph\u00fa Th\u1ecd<\/td>\nAssessment of drought tolerance of some Hybrid accia and Eucalyptus varieties during the nursery period in Phu Tho<\/td>\nNguy\u1ec5n Ng\u1ecdc Qu\u1ef3nh
\nNg\u00f4 Th\u1ebf Long
\nHo\u00e0ng V\u0103n Th\u1eafng<\/td>\n		30<\/td>\n<\/tr>\n
5.<\/td>\n\u1ea2nh h\u01b0\u1edfng c\u1ee7a m\u1eadt \u0111\u1ed9 v\u00e0 ph\u00e2n b\u00f3n \u0111\u1ebfn sinh tr\u01b0\u1edfng v\u00e0 n\u0103ng su\u1ea5t c\u1ee7a c\u00e2y Gi\u1ea3o c\u1ed5 lam (Gynostemma pentaphyllum<\/em>) t\u1ea1i t\u1ec9nh B\u1eafc K\u1ea1n<\/td>\nEffects of density and fertilizers to the growth and yield of Gynostemma pentaphyllum<\/em>
\nin Bac Kan province<\/td>\n		Tr\u1ea7n Trung Ki\u00ean
\nNguy\u1ec5n Minh Ch\u00ed
\nN\u00f4ng Ph\u01b0\u01a1ng Nhung
\nHo\u00e0ng Th\u1ecb L\u00e1nh<\/td>\n		39<\/td>\n<\/tr>\n
6.<\/td>\n\u0110\u00e1nh gi\u00e1 sinh tr\u01b0\u1edfng v\u00e0 n\u0103ng su\u1ea5t c\u1ee7a m\u1ed9t s\u1ed1 xu\u1ea5t x\u1ee9
\nTr\u00e0m l\u00e1 d\u00e0i (Melaleuca leucadendra<\/em>) tr\u1ed3ng tr\u00ean
\nv\u00f9ng \u0111\u1ea5t ph\u00e8n t\u1ea1i huy\u1ec7n Th\u1ea1nh H\u00f3a, t\u1ec9nh Long An<\/td>\n		Assessment the growth and yield of some provenances Melaleuca leucadendra<\/em> is planting in acid sulphate soil at Experiment Station, Thanh Hoa district, Long An province<\/td>\nNg\u00f4 V\u0103n Ng\u1ecdc
\nNguy\u1ec5n Trung Th\u00f4ng
\nKi\u1ec1u Tu\u1ea5n \u0110\u1ea1t
\n\u0110\u1eb7ng Ph\u01b0\u1edbc \u0110\u1ea1i
\nL\u00ea Thanh Quang
\nNguy\u1ec5n Th\u1ecb Hi\u00ean<\/td>\n		50<\/td>\n<\/tr>\n
7.<\/td>\n\u1ea2nh h\u01b0\u1edfng c\u1ee7a c\u00e1c bi\u1ec7n ph\u00e1p k\u1ef9 thu\u1eadt l\u00e2m sinh \u0111\u1ebfn sinh tr\u01b0\u1edfng r\u1eebng tr\u1ed3ng keo lai cung c\u1ea5p g\u1ed7 l\u1edbn t\u1ea1i t\u1ec9nh Qu\u1ea3ng Tr\u1ecb<\/td>\nEffects of silviculture techniques on the growth of Acacia hybrids plantation for sawlog in Quang Tri province<\/td>\nV\u0169 \u0110\u1ee9c B\u00ecnh
\nNguy\u1ec5n Th\u1ecb Thanh Nga
\nNguy\u1ec5n H\u1ea3i Th\u00e0nh L\u00ea C\u00f4ng \u0110\u1ecbnh
\nH\u00e0 V\u0103n Thi\u1ec7n
\nTr\u1ea7n Anh Trung<\/td>\n		63<\/td>\n<\/tr>\n
8.<\/td>\n\u1ea2nh h\u01b0\u1edfng c\u1ee7a m\u1ed9t s\u1ed1 y\u1ebfu t\u1ed1 sinh th\u00e1i \u0111\u1ebfn t\u00e1i sinh t\u1ef1 nhi\u00ean c\u1ee7a S\u1ebfn m\u1ee7 (Shorea roxburghii<\/em> G. Don) trong r\u1eebng k\u00edn th\u01b0\u1eddng xanh \u1ea9m nhi\u1ec7t \u0111\u1edbi t\u1ea1i khu v\u1ef1c T\u00e2n Ph\u00fa thu\u1ed9c t\u1ec9nh \u0110\u1ed3ng Nai<\/td>\nThe effect of ecological factors to natural regeneration of Shorea roxburghii<\/em> G. Don in tropical moist evergreen closed forest at Tan Phu zone of Dong Nai province<\/td>\nL\u00ea H\u1ed3ng Vi\u1ec7t
\nTr\u1ea7n Quang B\u1ea3o<\/td>\n		77<\/td>\n<\/tr>\n
9.<\/td>\n\u1ea2nh h\u01b0\u1edfng c\u1ee7a t\u1ec9a th\u01b0a
\n\u0111\u1ebfn sinh tr\u01b0\u1edfng c\u1ee7a Keo tai t\u01b0\u1ee3ng (Acacia mangium<\/em> Willd) t\u1ea1i Y\u00ean Th\u1ebf,
\nB\u1eafc Giang<\/td>\n		Effects of thinning on the growth of Acacia mangium<\/em> Willd in Yen The district, Bac Giang province<\/td>\nPh\u1ea1m Qu\u1ed1c Chi\u1ebfn
\nL\u00f2 Quang Th\u00e0nh
\n\u0110\u1eb7ng Th\u1ecbnh Tri\u1ec1u
\nD\u01b0\u01a1ng Quang Trung<\/td>\n		89<\/td>\n<\/tr>\n
10.<\/td>\nNghi\u00ean c\u1ee9u kh\u1ea3 n\u0103ng h\u1ea5p th\u1ee5 CO2<\/sub> c\u1ee7a r\u1eebng tr\u1ed3ng Sa m\u1ed9c (Cunninghamia lanceolata<\/em> Hook) \u1edf c\u00e1c tu\u1ed5i kh\u00e1c nhau t\u1ea1i M\u01b0\u1eddng Kh\u01b0\u01a1ng – L\u00e0o Cai<\/td>\nThe CO2<\/sub> absorptive capacity
\nof Cunninghamia lanceolata<\/em> plantation at the different ages
\nin Muong Khuong district,
\nLao Cai province<\/td>\n		\u0110o\u00e0n Doanh Ti\u1ebfn
\nNguy\u1ec5n Th\u1ecb Thu Hi\u1ec1n
\n\u0110\u1ed7 Ho\u00e0ng Chung<\/td>\n		95<\/td>\n<\/tr>\n
11.<\/td>\n\u1ea2nh h\u01b0\u1edfng c\u1ee7a thu\u1ed1c h\u00f3a h\u1ecdc \u0111\u1ebfn M\u1ecdt \u0111\u1ee5c th\u00e2n Euwallacea fornicatus<\/em> (Eichhoff) \u0103n n\u1ea5m b\u1ec7nh Fusarium euwallacea<\/em> trong \u0111i\u1ec1u ki\u1ec7n ph\u00f2ng th\u00ed nghi\u1ec7m<\/td>\nEffect of fungicides on shot hole borer Euwallacea fornicatus<\/em> (Eichhoff) feeding pathogenic fungus Fusarium euwallacea<\/em> under laboratory conditions<\/td>\nB\u00f9i Quang Ti\u1ebfp
\nNguy\u1ec5n V\u0103n Nam<\/td>\n		103<\/td>\n<\/tr>\n
12.<\/td>\nTh\u1ea9m \u0111\u1ecbnh c\u00e1c ph\u01b0\u01a1ng ph\u00e1p t\u1ea1o c\u00e2y Th\u1ee7y t\u00f9ng
\n(Glyptostrobus pensilis<\/em> (Staunton ex D.Don) K.Koch)<\/td>\n		Assessment of methods for generating plants of Glyptostrobus pensilis <\/em>(Staunton ex D.Don) K. Koch<\/td>\nTr\u1ea7n \u0110\u1ee9c Tr\u1ecdng
\nTr\u1ea7n Xu\u00e2n Ph\u01b0\u1edbc
\nV\u00f5 Th\u00e0nh T\u00e1m
\nPhan Thanh Tu\u1ea5n
\nTr\u1ecbnh Duy H\u1ea3i
\nL\u00ea V\u0103n Huy
\nPh\u1ea1m Quang Phong
\nB\u1ea3o Huy<\/td>\n		110<\/td>\n<\/tr>\n
13.<\/td>\nX\u00e1c \u0111\u1ecbnh tu\u1ed5i th\u00e0nh th\u1ee5c kinh t\u1ebf c\u1ee7a lo\u00e0i keo lai (Acacia mangium<\/em> \u00d7 A. auriculiformis<\/em>) theo m\u1ee5c \u0111\u00edch kinh doanh<\/td>\nDetermining the age of economic maturity of Acacia hybrid (Acacia mangium<\/em> \u00d7
\nA. auriculiformis<\/em>) by business purpose<\/td>\n		Ph\u1ea1m Th\u1ecb Luy\u1ec7n
\nV\u0169 Duy V\u0103n
\nNguy\u1ec5n Quang H\u00e0<\/td>\n		121<\/td>\n<\/tr>\n
14.<\/td>\n\u0110\u00e1nh gi\u00e1 kh\u1ea3 n\u0103ng s\u1eed d\u1ee5ng g\u1ed7 c\u00e2y D\u1ebb \u0111\u1ecf (Lithocarpus ducampii<\/em> A. Camus)<\/td>\nAssessment of the possibility in wood utilization of Lithocarpus ducampii<\/em> A. Camus<\/td>\nV\u00f5 \u0110\u1ea1i H\u1ea3i
\nNguy\u1ec5n T\u1eed Kim
\nV\u0169 Th\u1ecb Ngoan
\nNguy\u1ec5n Th\u1ecb Tr\u1ecbnh
\nNguy\u1ec5n Tr\u1ecdng Ngh\u0129a<\/td>\n		131<\/td>\n<\/tr>\n
15.<\/td>\nK\u1ebft qu\u1ea3 s\u1ea5y s\u01a1 b\u1ed9 g\u1ed7 T\u1ebfch (Tectona grandis<\/em>) b\u1eb1ng l\u00f2 s\u1ea5y n\u0103ng l\u01b0\u1ee3ng m\u1eb7t tr\u1eddi<\/td>\nA study on pre-drying technology for Tectona grandis<\/em> sawn timber in solar kiln<\/td>\nB\u00f9i Duy Ng\u1ecdc
\nH\u00e0 Ti\u1ebfn M\u1ea1nh
\nL\u00ea Th\u1ecb H\u01b0ng<\/td>\n		139<\/td>\n<\/tr>\n
16.<\/td>\nGi\u1edbi thi\u1ec7u d\u1ef1 \u00e1n \u201cTh\u00fac \u0111\u1ea9y qu\u1ea3n l\u00fd l\u00e2m s\u1ea3n b\u1ec1n v\u1eefng c\u1ee7a c\u00e1c c\u00f4ng ty l\u00e2m nghi\u1ec7p \u1edf Vi\u1ec7t Nam\u201d v\u00e0 m\u1ed9t s\u1ed1 k\u1ebft qu\u1ea3 \u0111\u1ea1t \u0111\u01b0\u1ee3c b\u01b0\u1edbc \u0111\u1ea7u<\/td>\n<\/td>\nNh\u00f3m th\u1ef1c hi\u1ec7n d\u1ef1 \u00e1n<\/td>\n147<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

 <\/p>\n

 <\/p>\n

<\/a>C\u1ea4U TR\u00daC, CH\u1ea4T L\u01af\u1ee2NG V\u00c0 \u0110A D\u1ea0NG SINH H\u1eccC
\nC\u00c1C TH\u1ea2M TH\u1ef0C V\u1eacT T\u1ea0I V\u01af\u1edcN QU\u1ed0C GIA BA V\u00cc, H\u00c0 N\u1ed8I<\/p>\n

<\/a>Tr\u1ea7n Minh Phong1<\/sup>, B\u00f9i M\u1ea1nh H\u01b0ng2<\/sup><\/p>\n

1<\/sup>Khoa L\u00e2m h\u1ecdc, \u0110\u1ea1i h\u1ecdc L\u00e2m nghi\u1ec7p
\n2<\/sup>B\u1ed9 m\u00f4n \u0110i\u1ec1u tra quy ho\u1ea1ch r\u1eebng, Khoa L\u00e2m h\u1ecdc, \u0110\u1ea1i h\u1ecdc L\u00e2m nghi\u1ec7p<\/p>\n

\u00a0<\/strong><\/p>\n\n\n\n\n\n
T\u00d3M T\u1eaeT<\/p>\n

Hi\u1ec3u \u0111\u01b0\u1ee3c \u0111\u1eb7c \u0111i\u1ec3m c\u1ea5u tr\u00fac v\u00e0 m\u1ee9c \u0111\u1ed9 \u0111a d\u1ea1ng sinh h\u1ecdc c\u1ee7a m\u1ed9t qu\u1ea7n x\u00e3 th\u1ef1c v\u1eadt r\u1eebng l\u00e0 m\u1ed9t trong nh\u1eefng c\u01a1 s\u1edf quan tr\u1ecdng trong nghi\u00ean c\u1ee9u m\u1ed9t h\u1ec7 sinh th\u00e1i v\u00e0 \u0111\u1ec1 xu\u1ea5t c\u00e1c bi\u1ec7n ph\u00e1p k\u1ef9 thu\u1eadt t\u00e1c \u0111\u1ed9ng v\u00e0o r\u1eebng. Nghi\u00ean c\u1ee9u \u0111\u00e3 ti\u1ebfn h\u00e0nh l\u1eadp t\u1ed5ng c\u1ed9ng 9 OTC ph\u00e2n b\u1ed1 tr\u00ean 3 tr\u1ea1ng th\u00e1i r\u1eebng kh\u00e1c nhau: IIB, IIIA1<\/sub> v\u00e0 IIIA2<\/sub>. K\u1ebft qu\u1ea3 ph\u00e2n t\u00edch cho th\u1ea5y \u0111\u01b0\u1eddng k\u00ednh th\u1ea5p nh\u1ea5p l\u00e0 \u1edf tr\u1ea1ng th\u00e1i r\u1eebng IIB c\u00f3 D1,3<\/sub> = 18,2 cm; \u0111\u1ed1i v\u1edbi tr\u1ea1ng th\u00e1i r\u1eebng IIIA1<\/sub> l\u00e0 19,82 cm v\u00e0 \u0111\u1ed1i v\u1edbi r\u1eebng IIIA2<\/sub> l\u00e0 21,15 cm. \u0110\u1ed1i v\u1edbi \u0111\u1ea1i l\u01b0\u1ee3ng chi\u1ec1u cao v\u00fat ng\u1ecdn c\u0169ng t\u01b0\u01a1ng t\u1ef1, nh\u1ecf nh\u1ea5t \u1edf IIB v\u00e0 sau \u0111\u00f3 l\u1edbn h\u01a1n t\u1ea1i tr\u1ea1ng th\u00e1i IIIA1<\/sub> v\u00e0 IIIA2<\/sub>. Ph\u00e2n b\u1ed1 Weibull c\u00f3 kh\u1ea3 n\u0103ng m\u00f4 ph\u1ecfng t\u1ed1t cho ph\u00e2n b\u1ed1 s\u1ed1 c\u00e2y theo c\u1ee1 k\u00ednh v\u00e0 chi\u1ec1u cao. K\u1ebft qu\u1ea3 ph\u00e2n t\u00edch th\u1ea5y r\u1eb1ng c\u00e2y t\u1ed1t th\u01b0\u1eddng l\u00e0 nh\u1eefng c\u00e2y c\u00f3 \u0111\u01b0\u1eddng k\u00ednh v\u00e0 chi\u1ec1u cao t\u01b0\u01a1ng \u0111\u1ed1i l\u1edbn. C\u00e1c c\u00e2y c\u00f3 ch\u1ea5t l\u01b0\u1ee3ng x\u1ea5u th\u01b0\u1eddng t\u1eadp trung v\u00e0o c\u00e1c \u0111\u01b0\u1eddng k\u00ednh v\u00e0 c\u1ee1 chi\u1ec1u cao nh\u1ecf. \u0110a d\u1ea1ng sinh h\u1ecdc c\u1ee7a c\u00e1c th\u1ea3m th\u1ef1c v\u1eadt l\u00e0 \u1edf m\u1ee9c cao, trong \u0111\u00f3 \u0111a d\u1ea1ng sinh h\u1ecdc cao nh\u1ea5t \u1edf tr\u1ea1ng th\u00e1i r\u1eebng IIIA1<\/sub>. \u0110a d\u1ea1ng th\u1ea5p nh\u1ea5t thu\u1ed9c tr\u1ea1ng th\u00e1i r\u1eebng IIB.<\/p>\n

T\u1eeb kh\u00f3a:<\/em><\/strong> C\u1ea5u tr\u00fac r\u1eebng, \u0111a d\u1ea1ng sinh h\u1ecdc, ch\u1ea5t l\u01b0\u1ee3ng r\u1eebng, V\u01b0\u1eddn Qu\u1ed1c gia Ba V\u00ec<\/td>\n<\/tr>\n

\n

<\/a>Structure, quality and biodiversity of forest types in Ba Vi National Park, Ha Noi<\/strong><\/p>\n

Understanding structural and biodiversity characteristics of a forest plant community is an important basis for studying an ecosystem and proposing technical measures to impact on the forest. The study conducted a total of 9 plots distributed in 3 different forest states: IIB, IIIA1 and IIIA2. The analytical results showed that the low diameter was in the state of IIB forest with D1,3<\/sub> = 18.2 cm; for forest status IIIA1<\/sub> was 19.82 cm and for IIIA2<\/sub> forest was 21.15 cm. For the total height variable, it was similar, the smallest in IIB and then greater in the state of IIIA1<\/sub> and IIIA2<\/sub>. Weibull distribution had a good simulation ability for both diameter and toal height frequency distributions of trees. Analysis results showed that good trees were usually trees with relatively large diameter and height trees. Trees of poor quality often concentrated on small diameter and height trees. Biodiversity of vegetation types was high, in particular, the highest biodiversity belonged to the forest status IIIA1<\/sub>. The lowest biodiversity was IIB forest status.<\/p>\n

Keywords:<\/em><\/strong> Forest structure, biodversity, forest quality, Ba Vi National Park<\/td>\n<\/tr>\n

<\/a>NGHI\u00caN C\u1ee8U TH\u00c0NH PH\u1ea6N TH\u1ee8C \u0102N V\u00c0 M\u1ed8T S\u1ed0 T\u1eacP T\u00cdNH C\u1ee6A VO\u1eccC CH\u00c0 V\u00c1 CH\u00c2N X\u00c1M (Pygathrix cinerea)
\n<\/em>T\u1ea0I H\u00d2N D\u1ed2, TH\u00d4N \u0110\u1ed2NG C\u1ed0, X\u00c3 TAM M\u1ef8 T\u00c2Y,
\nHUY\u1ec6N N\u00daI TH\u00c0NH, T\u1ec8NH QU\u1ea2NG NAM<\/a>Nguy\u1ec5n Th\u1ecb Thu Th\u1ea3o1<\/sup>, L\u00ea V\u0103n Ph\u1ee5ng1<\/sup>, Tr\u1ea7n H\u1eefu V\u1ef92<\/sup>,
\nTr\u1ea7n Ng\u1ecdc To\u00e0n2<\/sup>, Nguy\u1ec5n \u00c1i T\u00e2m 3<\/sup><\/p>\n

1<\/sup><\/strong>Tr\u01b0\u1eddng \u0110\u1ea1i h\u1ecdc S\u01b0 ph\u1ea1m – \u0110\u1ea1i h\u1ecdc \u0110\u00e0 N\u1eb5ng
\n2<\/sup>Trung t\u00e2m b\u1ea3o t\u1ed3n \u0110a d\u1ea1ng sinh h\u1ecdc N\u01b0\u1edbc Vi\u1ec7t Xanh (GreenViet)
\n3<\/sup> <\/strong>H\u1ed9i \u0110\u1ed9ng v\u1eadt h\u1ecdc Frankfurt<\/p>\n\n\n\n\n
T\u00d3M T\u1eaeT<\/p>\n

Vo\u1ecdc Ch\u00e0 v\u00e1 ch\u00e2n x\u00e1m (CVCX) l\u00e0 m\u1ed9t trong 5 lo\u00e0i linh tr\u01b0\u1edfng \u0111\u1eb7c h\u1eefu v\u00e0 nguy c\u1ea5p c\u1ee7a Vi\u1ec7t Nam, v\u1edbi v\u00f9ng ph\u00e2n b\u1ed1 gi\u1edbi h\u1ea1n \u1edf c\u00e1c t\u1ec9nh Nam Trung B\u1ed9 v\u00e0 T\u00e2y Nguy\u00ean. Hi\u1ec7n nay, khu v\u1ef1c H\u00f2n D\u1ed3 l\u00e0 m\u1ed9t trong b\u1ed1n v\u00f9ng ph\u00e2n b\u1ed1 c\u1ee7a Vo\u1ecdc CVCX \u1edf x\u00e3 Tam M\u1ef9 T\u00e2y, huy\u1ec7n N\u00fai Th\u00e0nh, t\u1ec9nh Qu\u1ea3ng Nam, v\u1edbi kho\u1ea3ng 18 – 19 c\u00e1 th\u1ec3 sinh s\u1ed1ng tr\u00ean di\u1ec7n t\u00edch 10,58 ha r\u1eebng nguy\u00ean sinh ngh\u00e8o. Qu\u1ea7n th\u1ec3 ch\u00e0 v\u00e1 \u1edf \u0111\u00e2y ho\u1ea1t \u0111\u1ed9ng trong m\u1ed9t khu v\u1ef1c r\u1ea5t nh\u1ecf, xung quanh b\u1ecb c\u00f4 l\u1eadp b\u1edfi r\u1eebng keo tr\u1ed3ng c\u1ee7a ng\u01b0\u1eddi d\u00e2n. Nghi\u00ean c\u1ee9u \u0111\u00e3 x\u00e1c \u0111\u1ecbnh \u0111\u01b0\u1ee3c th\u00e0nh ph\u1ea7n th\u1ee9c \u0103n v\u00e0 th\u1eddi gian ho\u1ea1t \u0111\u1ed9ng c\u1ee7a Vo\u1ecdc CVCX. V\u1ec1 th\u00e0nh ph\u1ea7n th\u1ee9c \u0103n, nghi\u00ean c\u1ee9u \u0111\u00e3 x\u00e1c \u0111\u1ecbnh \u0111\u01b0\u1ee3c \u00edt nh\u1ea5t 09 lo\u00e0i th\u1ef1c v\u1eadt thu\u1ed9c 7 h\u1ecd l\u00e0 th\u1ee9c \u0103n c\u1ee7a Vo\u1ecdc CVCX. C\u00e1c b\u1ed9 ph\u1eadn c\u1ee7a c\u00e2y \u0111\u01b0\u1ee3c Vo\u1ecdc CVCX s\u1eed d\u1ee5ng l\u00e0m th\u1ee9c \u0103n ch\u1ee7 y\u1ebfu l\u00e0 l\u00e1 non chi\u1ebfm 54%, l\u00e1 tr\u01b0\u1edfng th\u00e0nh 40% v\u00e0 ch\u1ed3i non 6%. Vo\u1ecdc CVCX t\u1ea1i H\u00f2n D\u1ed3 \u0111\u01b0\u1ee3c ghi nh\u1eadn ho\u1ea1t \u0111\u1ed9ng theo \u0111\u00e0n v\u1edbi th\u1eddi gian ho\u1ea1t \u0111\u1ed9ng t\u00edch c\u1ef1c trong ng\u00e0y t\u1eeb 5 gi\u1edd 30 \u0111\u1ebfn 17 gi\u1edd 30. V\u1ec1 qu\u1ef9 th\u1eddi gian ho\u1ea1t \u0111\u1ed9ng, Vo\u1ecdc CVCX t\u1ea1i H\u00f2n D\u1ed3 d\u00e0nh th\u1eddi gian nhi\u1ec1u nh\u1ea5t cho ho\u1ea1t \u0111\u1ed9ng di chuy\u1ec3n (33,5%), ti\u1ebfp theo l\u00e0 ho\u1ea1t \u0111\u1ed9ng \u0103n (30,1%), ngh\u1ec9 ng\u01a1i (25,8%), x\u00e3 h\u1ed9i (10%) v\u00e0 c\u00e1c ho\u1ea1t \u0111\u1ed9ng kh\u00e1c (0,6%). C\u00e1c m\u1ed1i \u0111e d\u1ecda ch\u00ednh \u0111\u1ed1i v\u1edbi Vo\u1ecdc CVCX t\u1ea1i H\u00f2n D\u1ed3 l\u00e0 s\u0103n b\u1eaft v\u00e0 m\u1ea5t sinh c\u1ea3nh s\u1ed1ng.<\/p>\n

T\u1eeb kh\u00f3a:<\/em><\/strong> Ch\u00e0 v\u00e1 ch\u00e2n x\u00e1m, Tam M\u1ef9 T\u00e2y, th\u00e0nh ph\u1ea7n th\u1ee9c \u0103n<\/td>\n<\/tr>\n

\n

<\/a>Study on feed ingredients and some behaviors of grey-shanked douc langur (Pygathrix cinerea)<\/em> in Hon Do forest, Tam My Tay commune, Nui Thanh district, Quang Nam province<\/strong><\/p>\n

Grey-shanked douc langur (Pygathrix cinerea)<\/em> is one of five endemic and endangered primates in Vietnam, with limited distribution in the South Central and Highlands provinces. Hon Do is one of four distribution areas of Grey-shanked douc langur in Tam My Tay commune, Nui Thanh district, Quang Nam province, with about 18 – 19 individuals living on the area of 10.58 ha of the poor primary forest. The Grey-shanked douc langur population is living in a very small area and isolated with other populations by acacia forest planted by local people. This study has identified feed ingredients and activity time of Grey-shanked the doucs. In term of feed ingredients, at least 09 species of flora belonging 7 different families were food of doucs, in which, young leaves were mostly used acounted for 54%, following by mature leaves (40%) and shoots (6%). The Grey-shanked douc langur population at Hon Do living in herds with active time during the day was from 5:30 to 17:30. Regarding activity time, the douc spended the most time for moving (33.5%), eating (30.1%), rest (25.8%), social activity (10%) and other activities (0.6%). The main threats to the Grey-shaked douc langur at Hon Do were hunting and loss of habitat.<\/p>\n

Keywords:<\/em><\/strong> Food ingredients, Grey-shanked langur douc, Tam My Tay<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

<\/a>K\u1ebeT QU\u1ea2 B\u01af\u1edaC \u0110\u1ea6U NGHI\u00caN C\u1ee8U NH\u00c2N GI\u1ed0NG
\nGI\u1ed4I \u0102N H\u1ea0T (Michelia tonkinensis <\/em>A. Chev) B\u1eb0NG PH\u01af\u01a0NG PH\u00c1P GI\u00c2M HOM T\u1ea0I KHU B\u1ea2O T\u1ed2N THI\u00caN NHI\u00caN XU\u00c2N LI\u00caN, T\u1ec8NH THANH H\u00d3A<\/p>\n

<\/a>\u0110\u1ed7 Ng\u1ecdc D\u01b0\u01a1ng1<\/sup>, Ng\u00f4 Xu\u00e2n Minh1<\/sup>, B\u00f9i Th\u1ecb Huy\u1ec1n2<\/sup>, Tr\u1ea7n Anh Tu\u1ea5n3<\/sup><\/p>\n

1<\/sup>Khu B\u1ea3o t\u1ed3n thi\u00ean nhi\u00ean Xu\u00e2n Li\u00ean
\n2<\/sup>Tr\u01b0\u1eddng \u0110\u1ea1i h\u1ecdc H\u1ed3ng \u0110\u1ee9c
\n3<\/sup>Tr\u01b0\u1eddng \u0110\u1ea1i h\u1ecdc T\u00e2y B\u1eafc<\/p>\n\n\n\n\n
T\u00d3M T\u1eaeT<\/p>\n

Gi\u1ed5i \u0103n h\u1ea1t (Michelia tonkinensis<\/em> A. Chev, 1918) l\u00e0 c\u00e2y \u0111a t\u00e1c d\u1ee5ng, ngo\u00e0i gi\u00e1 tr\u1ecb cho g\u1ed7 d\u00f9ng trong x\u00e2y d\u1ef1ng nh\u00e0 v\u00e0 \u0111\u00f3ng \u0111\u1ed3 \u0111\u1ea1c c\u00f2n \u0111\u01b0\u1ee3c tr\u1ed3ng \u0111\u1ec3 l\u1ea5y h\u1ea1t v\u00e0 v\u1ecf c\u00e2y l\u00e0m gia v\u1ecb v\u00e0 l\u00e0m d\u01b0\u1ee3c li\u1ec7u. B\u00e0i b\u00e1o n\u00e0y tr\u00ecnh b\u00e0y k\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u gi\u00e2m hom c\u00e2y Gi\u1ed5i \u0103n h\u1ea1t t\u1ea1i Khu B\u1ea3o t\u1ed3n thi\u00ean nhi\u00ean (BTTN) Xu\u00e2n Li\u00ean, t\u1ec9nh Thanh H\u00f3a. K\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u \u0111\u00e3 kh\u1eb3ng \u0111\u1ecbnh ch\u1ea5t \u0111i\u1ec1u h\u00f2a sinh tr\u01b0\u1edfng v\u00e0 gi\u00e1 th\u1ec3 gi\u00e2m hom c\u00f3 \u1ea3nh h\u01b0\u1edfng r\u00f5 r\u1ec7t t\u1edbi t\u1ef7 l\u1ec7 ra r\u1ec5, ch\u1ea5t l\u01b0\u1ee3ng r\u1ec5, t\u1ef7 l\u1ec7 n\u1ea3y ch\u1ed3i c\u1ee7a c\u00e2y hom Gi\u1ed5i \u0103n h\u1ea1t. Hom gi\u00e2m n\u1ebfu kh\u00f4ng x\u1eed l\u00fd ch\u1ea5t \u0111i\u1ec1u h\u00f2a sinh tr\u01b0\u1edfng hom s\u1ebd ch\u1ebft trong kho\u1ea3ng th\u1eddi gian 20 – 30 ng\u00e0y sau khi gi\u00e2m. Hom s\u1eed d\u1ee5ng c\u00e1c ch\u1ea5t \u0111i\u1ec1u h\u00f2a sinh tr\u01b0\u1edfng IAA n\u1ed3ng \u0111\u1ed9 200 ppm, IBA n\u1ed3ng \u0111\u1ed9 100 – 150 ppm v\u00e0 NAA n\u1ed3ng \u0111\u1ed9 250 ppm \u0111\u1ec3 x\u1eed l\u00fd hom cho t\u1ef7 l\u1ec7 hom ra ch\u1ed3i v\u00e0 ra r\u1ec5 l\u1edbn h\u01a1n 50%. IBA n\u1ed3ng \u0111\u1ed9 150 ppm, gi\u00e2m hom tr\u00ean gi\u00e1 th\u1ec3 50% c\u00e1t v\u00e0ng + 50% x\u01a1 d\u1eeba cho s\u1ed1 l\u01b0\u1ee3ng v\u00e0 ch\u1ea5t l\u01b0\u1ee3ng c\u00e2y hom cao nh\u1ea5t: t\u1ef7 l\u1ec7 hom s\u1ed1ng l\u00e0 96%, t\u1ef7 l\u1ec7 hom ra r\u1ec5 88%, ch\u1ec9 s\u1ed1 ra r\u1ec5 31,7% v\u00e0 t\u1ef7 l\u1ec7 n\u1ea3y ch\u1ed3i 88,9%. Th\u00e0nh c\u00f4ng c\u1ee7a nghi\u00ean c\u1ee9u n\u00e0y g\u00f3p ph\u1ea7n quan tr\u1ecdng cho c\u00e1c nghi\u00ean c\u1ee9u c\u1ea3i thi\u1ec7n gi\u1ed1ng Gi\u1ed5i \u0103n h\u1ea1t n\u00f3i ri\u00eang, c\u1ea3i thi\u1ec7n gi\u1ed1ng c\u00e2y r\u1eebng n\u00f3i chung.<\/p>\n

T\u1eeb kh\u00f3a:<\/em><\/strong> Gi\u1ed5i \u0103n h\u1ea1t, nh\u00e2n gi\u1ed1ng b\u1eb1ng hom, Khu B\u1ea3o t\u1ed3n thi\u00ean nhi\u00ean Xu\u00e2n Li\u00ean<\/td>\n<\/tr>\n

\n

<\/a>Studying of propagation of nut eating michelia (Michelia tonkinensis <\/em>A. Chev) by cutting method at Xuan Lien Nature Reserve, Thanh Hoa province<\/strong><\/p>\n

Nut eating michelia, Michelia tonkinensis<\/em> A. Chev, is multi – purpose tree, in addition to the value for timber used in house construction and furniture making, it\u2019s seed and bark are also used for spices and medicinal herbs. This paper presents the results of research on cutting – propagation of Michelia tonkinensis<\/em> A. Chev at Xuan Lien Nature Reserve, Thanh Hoa province. The research results confirmed that growth regulators and cutting substrate materialshave a significant effect on the root forming ratio and quality of cutting roots. Cuttings without phytohoormone treatment will die within 20 – 30 days. Cuttings treated by 200 ppm IAA growth regulators, 100 – 150 pp IBA and 250 ppm NAA reached rate of buds and root forming greater than 50%. The mix of 50% gold sand + 50% coconut fiber, in combination with IBA concentration of 150 ppm, made the highest quantity and quality of cuttings, the ratio of live cuttings is 96%, the ratio of root – forming cuttings was 88% and the index of root forming was 31.7%, shoot forming ratio was 88.9%. The success of this study contributes significantly to the research of improvement of Michelia tonkinensis<\/em> A. Chev species in paricular, and of forest tree in genaral.<\/p>\n

Keywords:<\/em><\/strong> Nut eating mechelia, propagating by cuttings, Xuan Lien Nature Reserve<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

<\/a>NGHI\u00caN C\u1ee8U KH\u1ea2 N\u0102NG CH\u1ecaU H\u1ea0N C\u1ee6A M\u1ed8T S\u1ed0 D\u00d2NG KEO LAI V\u00c0 B\u1ea0CH \u0110\u00c0N
\nTRONG GIAI \u0110O\u1ea0N V\u01af\u01a0N \u01af\u01a0M T\u1ea0I T\u1ec8NH PH\u00da TH\u1ecc<\/p>\n

<\/a>Nguy\u1ec5n Ng\u1ecdc Qu\u1ef3nh1<\/sup>, Ng\u00f4 Th\u1ebf Long1<\/sup>, Ho\u00e0ng V\u0103n Th\u1eafng2<\/sup><\/p>\n

Tr\u01b0\u1eddng \u0110\u1ea1i h\u1ecdc H\u00f9ng V\u01b0\u01a1ng, Vi\u1ec7t Tr\u00ec, Ph\u00fa Th\u1ecd
\n2 Vi\u1ec7n Khoa h\u1ecdc L\u00e2m nghi\u1ec7p Vi\u1ec7t Nam<\/p>\n\n\n\n\n
T\u00d3M T\u1eaeT<\/p>\n

Nghi\u00ean c\u1ee9u kh\u1ea3 n\u0103ng ch\u1ecbu h\u1ea1n c\u1ee7a m\u1ed9t s\u1ed1 d\u00f2ng keo lai v\u00e0 b\u1ea1ch \u0111\u00e0n l\u00e0 r\u1ea5t c\u1ea7n thi\u1ebft trong c\u00f4ng t\u00e1c ch\u1ecdn gi\u1ed1ng tr\u1ed3ng r\u1eebng, \u0111\u1eb7c bi\u1ec7t trong b\u1ed1i c\u1ea3nh bi\u1ebfn \u0111\u1ed5i kh\u00ed h\u1eadu nh\u01b0 hi\u1ec7n nay. C\u00e1c k\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u l\u00e0 c\u01a1 s\u1edf khoa h\u1ecdc g\u00f3p ph\u1ea7n ch\u1ecdn l\u1ef1a c\u00e1c d\u00f2ng keo lai v\u00e0 b\u1ea1ch \u0111\u00e0n c\u00f3 kh\u1ea3 n\u0103ng ch\u1ecbu h\u1ea1n \u0111\u1ec3 ph\u1ee5c v\u1ee5 c\u00f4ng t\u00e1c tr\u1ed3ng r\u1eebng t\u1ea1i t\u1ec9nh Ph\u00fa Th\u1ecd. K\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u ch\u1ec9 ra r\u1eb1ng, c\u00e1c d\u00f2ng keo lai BV10, KLTA3, KL20 c\u00f3 kh\u1ea3 n\u0103ng ch\u1ecbu h\u1ea1n t\u1ed1t h\u01a1n c\u00e1c d\u00f2ng b\u1ea1ch \u0111\u00e0n PN14, PNCT3 v\u00e0 PNCTIV. Sau 40 ng\u00e0y th\u00ed nghi\u1ec7m, t\u1ef7 l\u1ec7 ch\u1ebft c\u1ee7a c\u00e1c d\u00f2ng b\u1ea1ch \u0111\u00e0n cao h\u01a1n r\u00f5 r\u1ec7t so v\u1edbi c\u00e1c d\u00f2ng keo lai. H\u01a1n n\u1eefa trong c\u00e1c d\u00f2ng b\u1ea1ch \u0111\u00e0n th\u00ec d\u00f2ng PNCTIV c\u00f3 kh\u1ea3 n\u0103ng ch\u1ecbu h\u1ea1n t\u1ed1t h\u01a1n hai d\u00f2ng PN14 v\u00e0 PNCT3 khi t\u1ef7 l\u1ec7 s\u1ed1ng l\u1ea7n l\u01b0\u1ee3t l\u00e0 67%, 45% v\u00e0 40%; trong c\u00e1c d\u00f2ng keo lai th\u00ec d\u00f2ng KL20 c\u00f3 t\u1ef7 l\u1ec7 s\u1ed1ng l\u00ean t\u1edbi 90% cao h\u01a1n so v\u1edbi hai d\u00f2ng BV10 v\u00e0 KLTA3 (80%).<\/p>\n

T\u1eeb kh\u00f3a:<\/em><\/strong> b\u1ea1ch \u0111\u00e0n, keo lai, kh\u1ea3 n\u0103ng ch\u1ecbu h\u1ea1n, v\u01b0\u1eddn \u01b0\u01a1m, Ph\u00fa Th\u1ecd<\/p>\n

 <\/td>\n<\/tr>\n

\n

<\/a>Assessment of drought tolerance of some Hybrid acacia and Eucalyptus varieties during the nursery period in Phu Tho province<\/strong><\/p>\n

Study on drought tolerance of some hybrid acacia and eucalyptus varieties are crucial for forest breeding. The results of this study play a important role to contribute scientific evidents for choosing suitable acacia and eucalyptus varieties for afforestation in Phu Tho province. Our results indicated that acacia varieties tolerated to drought better than eucalyptus ones. Among eucalyptus varieties, PNCTIV variety exhibited stronger fitness to drought than other ones; and KL20 variety showed a higher fitness to drought than KLTA3 and BV10.<\/p>\n

Keywords:<\/em><\/strong> Drought tolerance, eucalyptus, hybrid acacia, nursery, Phu Tho<\/p>\n

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

<\/a>\u1ea2NH H\u01af\u1edeNG C\u1ee6A M\u1eacT \u0110\u1ed8 V\u00c0 PH\u00c2N B\u00d3N \u0110\u1ebeN SINH TR\u01af\u1edeNG
\nV\u00c0 N\u0102NG SU\u1ea4T C\u1ee6A C\u00c2Y GI\u1ea2O C\u1ed4 LAM (Gynostemma pentaphyllum<\/em>) T\u1ea0I T\u1ec8NH B\u1eaeC K\u1ea0N<\/p>\n

<\/a>Tr\u1ea7n Trung Ki\u00ean1<\/sup>, Nguy\u1ec5n Minh Ch\u00ed2<\/sup>, N\u00f4ng Ph\u01b0\u01a1ng Nhung2<\/sup>, Ho\u00e0ng Th\u1ecb L\u00e1nh3<\/sup><\/p>\n

1<\/sup>Tr\u01b0\u1eddng \u0110\u1ea1i h\u1ecdc N\u00f4ng L\u00e2m Th\u00e1i Nguy\u00ean
\n2<\/sup>Vi\u1ec7n Khoa h\u1ecdc L\u00e2m nghi\u1ec7p Vi\u1ec7t Nam
\n3<\/sup>UBND huy\u1ec7n P\u1eafc N\u1eb7m, t\u1ec9nh B\u1eafc K\u1ea1n<\/p>\n\n\n\n\n
T\u00d3M T\u1eaeT<\/p>\n

C\u00e2y Gi\u1ea3o c\u1ed5 lam (Gynostemma pentaphyllum<\/em>) c\u00f3 ph\u00e2n b\u1ed1 trong t\u1ef1 nhi\u00ean t\u1ea1i t\u1ec9nh B\u1eafc K\u1ea1n. Tuy nhi\u00ean, lo\u00e0i c\u00e2y n\u00e0y \u0111ang ng\u00e0y c\u00e0ng c\u1ea1n ki\u1ec7t do ng\u01b0\u1eddi d\u00e2n \u0111\u1ecba ph\u01b0\u01a1ng khai th\u00e1c qu\u00e1 m\u1ee9c nh\u01b0ng kh\u00f4ng c\u00f3 bi\u1ec7n ph\u00e1p duy tr\u00ec v\u00e0 b\u1ea3o t\u1ed3n. \u0110\u1ebfn nay, c\u0169ng ch\u01b0a c\u00f3 nghi\u00ean c\u1ee9u s\u00e2u v\u1ec1 ph\u00e2n b\u00f3n v\u00e0 m\u1eadt \u0111\u1ed9 tr\u1ed3ng \u0111\u1ec3 c\u00f3 th\u1ec3 \u1ee9ng d\u1ee5ng v\u00e0o tr\u1ed3ng th\u00e2m canh c\u00e2y Gi\u1ea3o c\u1ed5 lam. Nghi\u00ean c\u1ee9u n\u00e0y tri\u1ec3n khai th\u00ed nghi\u1ec7m 2 nh\u00e2n t\u1ed1 v\u1edbi 3 m\u1ee9c m\u1eadt \u0111\u1ed9 (M1: 200.000 c\u00e2y\/ha; M2: 250.000 c\u00e2y\/ha; M3: 334.000 c\u00e2y\/ha) v\u00e0 4 m\u1ee9c ph\u00e2n b\u00f3n (P1: 200 kg N + 100 kg P2<\/sub>O5<\/sub> + 40 kg K2<\/sub>O\/ha; P2: 250 kg N + 150 kg P2<\/sub>O5<\/sub> + 60 kg K2<\/sub>O\/ha; P3: 300 kg N + 200 kg P2<\/sub>O5<\/sub> + 80 kg K2<\/sub>O\/ha; P4: 350 kg N + 250 kg P2<\/sub>O5<\/sub> + 100 kg K2<\/sub>O\/ha). K\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u cho th\u1ea5y: M\u1eadt \u0111\u1ed9 tr\u1ed3ng v\u00e0 li\u1ec1u l\u01b0\u1ee3ng ph\u00e2n b\u00f3n c\u00f3 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn t\u0103ng tr\u01b0\u1edfng chi\u1ec1u d\u00e0i th\u00e2n ch\u00ednh, s\u1ed1 l\u00e1 tr\u00ean th\u00e2n, ph\u00e2n c\u00e0nh. \u1ede th\u1eddi \u0111i\u1ec3m tr\u01b0\u1edbc thu ho\u1ea1ch, c\u00f4ng th\u1ee9c P4M3 c\u00f3 chi\u1ec1u d\u00e0i th\u00e2n ch\u00ednh \u0111\u1ea1t cao nh\u1ea5t (235,17 cm), c\u00f4ng th\u1ee9c P3M2 c\u00f3 s\u1ed1 l\u00e1 tr\u00ean th\u00e2n \u0111\u1ea1t cao nh\u1ea5t (32,37 l\u00e1). S\u1ef1 t\u0103ng tr\u01b0\u1edfng s\u1ed1 c\u00e0nh c\u1ea5p 1 \u1edf c\u00e1c m\u1eadt \u0111\u1ed9 v\u00e0 c\u00e1c m\u1ee9c ph\u00e2n b\u00f3n kh\u00e1c nhau r\u00f5 nh\u1ea5t \u1edf giai \u0111o\u1ea1n t\u1eeb 60 \u0111\u1ebfn 90 ng\u00e0y sau khi tr\u1ed3ng v\u00e0 gi\u1ea3m d\u1ea7n t\u1eeb giai \u0111o\u1ea1n 90 ng\u00e0y \u0111\u1ebfn khi thu ho\u1ea1ch l\u1ee9a \u0111\u1ea7u ti\u00ean, c\u00f4ng th\u1ee9c P3M2 c\u00f3 s\u1ed1 c\u00e0nh c\u1ea5p 2 \u0111\u1ea1t cao nh\u1ea5t (22,73 nh\u00e1nh). M\u1eadt \u0111\u1ed9 tr\u1ed3ng v\u00e0 li\u1ec1u l\u01b0\u1ee3ng ph\u00e2n b\u00f3n c\u00f3 \u1ea3nh h\u01b0\u1edfng r\u00f5 t\u1edbi n\u0103ng su\u1ea5t, trong \u0111\u00f3 c\u00f4ng th\u1ee9c P3M2 tr\u1ed3ng v\u1edbi m\u1eadt \u0111\u1ed9 250.000 c\u00e2y\/ha v\u00e0 b\u00f3n ph\u00e2n v\u1edbi m\u1ee9c 300 kg N + 200 kg P2<\/sub>O5<\/sub> + 80 kg K2<\/sub>O\/ha cho n\u0103ng su\u1ea5t cao nh\u1ea5t (11,50 t\u1ea5n t\u01b0\u01a1i\/ha\/l\u1ee9a; 1,37 t\u1ea5n kh\u00f4\/ha\/l\u1ee9a). Hi\u1ec7u qu\u1ea3 kinh t\u1ebf \u1edf c\u00f4ng th\u1ee9c P3M2 \u0111\u1ea1t cao nh\u1ea5t, l\u00e3i thu\u1ea7n \u0111\u1ea1t 196,97 tri\u1ec7u \u0111\u1ed3ng\/ha.<\/p>\n

T\u1eeb kh\u00f3a:<\/em><\/strong> Gi\u1ea3o c\u1ed5 lam, th\u00e2m canh, ph\u00e2n b\u00f3n, m\u1eadt \u0111\u1ed9<\/td>\n<\/tr>\n

\n

<\/a>Effects of density and fertilizers to the growth and yield of Gynostemma pentaphyllum<\/em> in Bac Kan province<\/strong><\/p>\n

Gynostemma pentaphyllum<\/em> (or the twisting blue plant) has a wild distribution in Pac Nam district, Bac Kan province. However, this species is exhausted dramatically due to over-exploitation by local residents without maintenance and conservation measurements. In addition, the study on fertilizer and planting density in the cultivation of G. pentaphyllum<\/em> is very limited. Therefore, this study focused on evaluating the influence of these two factors on the development of this plant. Three density levels (M1: 200,000 trees\/ha; M2: 250,000 trees\/ha; M3: 334,000 trees\/ha), and 4 levels of fertilizer with different level of nitrogen, phosphorus and potassium (P1: 200 kg N + 100 kg P2<\/sub>O5<\/sub> + 40 kg K2<\/sub>O\/ha; P2: 250 kg N + 150 kg P2<\/sub>O5<\/sub> + 60 kg K2<\/sub>O\/ha; P3: 300 kg N + 200 kg P2<\/sub>O5<\/sub> + 80 kg K2<\/sub>O\/ha; P4: 350 kg N + 250 kg P2<\/sub>O5<\/sub> + 100 kg K2<\/sub>O\/ha) were conducted. As the results, planting density and fertilizer dosage showed significant effects on the growth of main stem length, number of leaves per stem and branches. At the time of harvesting, the P4M3 formula obtained the highest main stem length (235.17 cm), while the highest number of leaves on the stem (32.37 leaves) was observed in P3M2 formula. The growth of branches at different densities and levels of fertilizer was most evident in the period from 60 to 90 days after planting and gradually decreases from 90 days to harvest. The development of secondary branches was the highest in P3M2 formula with 22.73 branches. Planting density and fertilizer dosage have a significant difference in yield. The formula P3M2 with planting density of 250,000 trees\/ha and fertilizing of 300 kg N + 200 kg P2<\/sub>O5<\/sub> + 80 kg K2<\/sub>O\/ha achieved the highest yield of fresh biomass and dry biomass (11.50 tons\/ha and 1.37 tons\/ha, respectively), resulted in the highest economic efficiency with 196.97 million VND\/ha net profit.<\/p>\n

Keywords:<\/em><\/strong> Density, fertilizer, Gynostemma pentaphyllum<\/em><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

<\/a>\u0110\u00c1NH GI\u00c1 SINH TR\u01af\u1edeNG V\u00c0 N\u0102NG SU\u1ea4T C\u1ee6A M\u1ed8T S\u1ed0 XU\u1ea4T X\u1ee8 TR\u00c0M L\u00c1 D\u00c0I (Melaleuca leucadendra)<\/em> TR\u1ed2NG TR\u00caN V\u00d9NG \u0110\u1ea4T PH\u00c8N T\u1ea0I HUY\u1ec6N TH\u1ea0NH H\u00d3A,\u00a0T\u1ec8NH LONG AN<\/p>\n

<\/a>Ng\u00f4 V\u0103n Ng\u1ecdc, Nguy\u1ec5n Trung Th\u00f4ng, Ki\u1ec1u Tu\u1ea5n \u0110\u1ea1t, \u0110\u1eb7ng Ph\u01b0\u1edbc \u0110\u1ea1i,
\nL\u00ea Thanh Quang, Nguy\u1ec5n Th\u1ecb Hi\u00ean<\/p>\n

Vi\u1ec7n Khoa h\u1ecdc L\u00e2m nghi\u1ec7p Nam B\u1ed9<\/p>\n\n\n\n\n
T\u00d3M T\u1eaeT<\/p>\n

\u0110\u1ec1 t\u00e0i nghi\u00ean c\u1ee9u c\u00e1c bi\u1ec7n ph\u00e1p k\u1ef9 thu\u1eadt tr\u1ed3ng Tr\u00e0m l\u00e1 d\u00e0i (Melaleuca leucadendra)<\/em> th\u00e2m canh cung c\u1ea5p g\u1ed7 l\u1edbn \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n t\u1eeb n\u0103m 2014 t\u1ea1i Tr\u1ea1m th\u1ef1c nghi\u1ec7m L\u00e2m nghi\u1ec7p Th\u1ea1nh H\u00f3a, huy\u1ec7n Th\u1ea1nh H\u00f3a, t\u1ec9nh Long An. Nghi\u00ean c\u1ee9u \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n v\u1edbi 3 xu\u1ea5t x\u1ee9 Tr\u00e0m l\u00e1 d\u00e0i g\u1ed3m xu\u1ea5t x\u1ee9 Weipa. Qld (m\u00e3 s\u1ed1 xu\u1ea5t x\u1ee9 1201), xu\u1ea5t x\u1ee9 Cambridge G. WA (m\u00e3 s\u1ed1 xu\u1ea5t x\u1ee9 1206) v\u00e0 xu\u1ea5t x\u1ee9 Kuru PNG (m\u00e3 s\u1ed1 xu\u1ea5t x\u1ee9 1208). Th\u00ed nghi\u1ec7m \u0111\u01b0\u1ee3c b\u1ed1 tr\u00ed d\u1ea1ng l\u00f4 ch\u00ednh v\u00e0 l\u00f4 ph\u1ee5 v\u1edbi 3 l\u1ea7n l\u1eb7p l\u1ea1i. Di\u1ec7n t\u00edch l\u00f4 ch\u00ednh 400 m2<\/sup> v\u00e0 tr\u00ean l\u00f4 ch\u00ednh b\u1ed1 tr\u00ed 4 lo\u1ea1i m\u1eadt \u0111\u1ed9 tr\u1ed3ng kh\u00e1c nhau (M0: 15.000 c\u00e2y\/ha; M1: 7.500 c\u00e2y\/ha; 4.500 c\u00e2y\/ha v\u00e0 2.250 c\u00e2y\/ha) l\u00e0 \u00f4 ph\u1ee5. K\u1ebft qu\u1ea3 c\u1ee7a nghi\u00ean c\u1ee9u cho th\u1ea5y sau 4 n\u0103m tr\u1ed3ng xu\u1ea5t x\u1ee9 c\u00f3 t\u1ef7 l\u1ec7 s\u1ed1ng cao nh\u1ea5t l\u00e0 1208, k\u1ebf \u0111\u1ebfn l\u00e0 1201 v\u00e0 1206. V\u1ec1 sinh tr\u01b0\u1edfng \u0111\u01b0\u1eddng k\u00ednh \u0111\u1ebfn tu\u1ed5i 4 \u1edf m\u1eadt \u0111\u1ed9 M0, M1 v\u00e0 M3 c\u00f3 s\u1ef1 kh\u00e1c bi\u1ec7t c\u00f3 \u00fd ngh\u0129a (P < 0,05) trong \u0111\u00f3 1208 v\u00e0 1206 l\u1edbn h\u01a1n 1201. V\u1ec1 sinh tr\u01b0\u1edfng chi\u1ec1u cao theo c\u00f9ng c\u00f4ng th\u1ee9c m\u1eadt \u0111\u1ed9 c\u0169ng c\u00f3 s\u1ef1 kh\u00e1c bi\u1ec7t c\u00f3 \u00fd ngh\u0129a (P < 0,05), trong \u0111\u00f3 xu\u1ea5t x\u1ee9 c\u00f3 chi\u1ec1u cao t\u1ed1t nh\u1ea5t l\u00e0 1208 v\u00e0 th\u1ea5p nh\u1ea5t l\u00e0 1201. Tr\u1eef l\u01b0\u1ee3ng c\u00e2y \u0111\u1ee9ng t\u1ea1i th\u1eddi \u0111i\u1ec3m r\u1eebng 4 n\u0103m tu\u1ed5i c\u1ee7a c\u00e1c xu\u1ea5t x\u1ee9 tr\u1ed3ng c\u00f9ng m\u1eadt \u0111\u1ed9 kh\u00f4ng c\u00f3 s\u1ef1 kh\u00e1c bi\u1ec7t c\u00f3 \u00fd ngh\u0129a v\u1ec1 th\u1ed1ng k\u00ea (P > 0,05) v\u00e0 d\u1ea1ng t\u0103ng tr\u01b0\u1edfng v\u1ec1 tr\u1eef l\u01b0\u1ee3ng c\u1ee7a c\u00e1c xu\u1ea5t x\u1ee9 giai \u0111o\u1ea1n t\u1eeb 1 \u0111\u1ebfn 3 n\u0103m tu\u1ed5i \u0111i l\u00ean theo d\u1ea1ng \u0111\u01b0\u1eddng th\u1eb3ng v\u00e0 t\u0103ng nhanh \u1edf tu\u1ed5i 2 \u0111\u1ebfn tu\u1ed5i 3 sau \u0111\u00f3 gi\u1ea3m d\u1ea7n. N\u0103ng su\u1ea5t b\u00ecnh qu\u00e2n t\u1ea1i th\u1eddi \u0111i\u1ec3m r\u1eebng 4 n\u0103m tu\u1ed5i th\u00ec xu\u1ea5t x\u1ee9 1208 cho n\u0103ng su\u1ea5t t\u1ed1t h\u01a1n theo t\u1eebng c\u00f4ng th\u1ee9c th\u00ed nghi\u1ec7m M0; M1; M2 v\u00e0 M3 l\u1ea7n l\u01b0\u1ee3t l\u00e0 29,12 m3<\/sup>, 24,72 m3<\/sup>, 24,66 m3<\/sup> v\u00e0 17,24 m3<\/sup>; k\u1ebf \u0111\u1ebfn l\u00e0 xu\u1ea5t x\u1ee9 1201 l\u00e0 27,35 m3<\/sup>, 22,88 m3<\/sup>, 20,27 m3<\/sup> v\u00e0 13,18 m3<\/sup>; xu\u1ea5t x\u1ee9 1206 l\u00e0 26,84 m3<\/sup>, 23,39 m3<\/sup>, 18,14 m3<\/sup> v\u00e0 9,92 m3<\/sup>.<\/p>\n

T\u1eeb kh\u00f3a:<\/em><\/strong> Tr\u00e0m l\u00e1 d\u00e0i, sinh tr\u01b0\u1edfng, n\u0103ng su\u1ea5t, \u0111\u1ea5t ph\u00e8n, Long An<\/td>\n<\/tr>\n

\n

<\/a>Assessment the growth and yield of some provenances Melaleuca leucadendra<\/em> is planting in acid sulphate soil at Experiment Station, Thanh Hoa district, Long An province<\/strong><\/p>\n

Research on applying techniques for intensive planting of Melaleuca leucadendra<\/em> for supply of large timber estimated in 2014 at Thanh Hoa Forestry Experiment Station, Thanh Hoa District, Long An Province. The study was carried out with 3 provenances including Weipa origin. Qld (origin code 1201), Cambridge G. WA (origin code 1206) and Kuru PNG origin (origin code 1208). The experiment was designed in the sub-plot type with 3 replications. The main plot area is 400 m2<\/sup> arranged for tree origins and included of 4 sub-plots of planting densities (M0: 15,000 trees\/ha; M1: 7,500 trees\/ha; 4,500 trees\/ha and 2,250 trees\/ha). The results of the study showed that after 4 years of planting, the provenance has the highest survival rate is 1208, followed by 1201 and 1206. Regarding the growth of diameter to age 4, the density of M0, M1 and M3 is different significancy (P < 0.05) in which provevances 1208 and 1206 were greater than 1201, height growth according to the same density also had significant differences (P < 0.05), in which the best height of provenance is 1208 and the lowest is 1201. The standing tree stock at the age of 4 with the same density has no statistically significant difference (P > 0.05) and the growth form of all three origins go up in a straight line from 1 to 3 years of age and increases rapidly at the age of 2 to 3 years then decreases. The average yield at the age of 4 year old showed that origin 1208 proved to the best of yield according to all experimental treatments of M0; M1; M2 and M3 respectively 29.12 m3<\/sup>, 24.72 m3<\/sup>, 24.66 m3<\/sup> and 17.24 m3<\/sup>; followed by origin 1201 was 27.35 m3<\/sup>, 22.88 m3<\/sup>, 20.27 m3<\/sup> and 13.18 m3<\/sup>; origin 1206 was 26.84 m3<\/sup>, 23.39 m3, 18.14 m3<\/sup> and 9.92 m3<\/sup>.<\/p>\n

Keywords:<\/em><\/strong> Melaleuca leucadendra<\/em>, growth, yield, Acid sulphite soil, Long An province<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

<\/a>\u1ea2NH H\u01af\u1edeNG C\u1ee6A C\u00c1C BI\u1ec6N PH\u00c1P K\u1ef8 THU\u1eacT L\u00c2M SINH
\n\u0110\u1ebeN SINH TR\u01af\u1edeNG R\u1eeaNG TR\u1ed2NG KEO LAI CUNG C\u1ea4P G\u1ed6 L\u1edaN T\u1ea0I T\u1ec8NH QU\u1ea2NG TR\u1eca<\/p>\n

<\/a>V\u0169 \u0110\u1ee9c B\u00ecnh, Nguy\u1ec5n Th\u1ecb Thanh Nga, Nguy\u1ec5n H\u1ea3i Th\u00e0nh
\nL\u00ea C\u00f4ng \u0110\u1ecbnh, H\u00e0 V\u0103n Thi\u1ec7n, Tr\u1ea7n Anh Trung<\/p>\n

Trung t\u00e2m Khoa h\u1ecdc L\u00e2m nghi\u1ec7p B\u1eafc Trung B\u1ed9<\/p>\n\n\n\n\n
T\u00d3M T\u1eaeT<\/p>\n

B\u00e0i b\u00e1o n\u00e0y gi\u1edbi thi\u1ec7u k\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u \u1ea3nh h\u01b0\u1edfng c\u1ee7a c\u00e1c bi\u1ec7n ph\u00e1p k\u1ef9 thu\u1eadt l\u00e2m sinh nh\u1eb1m n\u00e2ng cao n\u0103ng su\u1ea5t v\u00e0 ch\u1ea5t l\u01b0\u1ee3ng r\u1eebng tr\u1ed3ng keo lai cung c\u1ea5p g\u1ed7 l\u1edbn t\u1ea1i Qu\u1ea3ng Tr\u1ecb. Sau 4,5 n\u0103m tu\u1ed5i, c\u00e1c m\u00f4 h\u00ecnh th\u00ed nghi\u1ec7m c\u00f3 t\u1ef7 l\u1ec7 s\u1ed1ng \u0111\u1ea1t t\u1eeb 86,67 – 92,5%, (DM) \u0111\u1ea1t 28,68 m3<\/sup>\/ha\/n\u0103m. C\u00f4ng th\u1ee9c ph\u00e1t, b\u0103m d\u1eadp th\u1ef1c b\u00ec t\u1ea1i ch\u1ed7 v\u00e0 ph\u00e1t, d\u1ecdn s\u1ea1ch th\u1ef1c b\u00ec c\u00f3 sinh tr\u01b0\u1edfng trong nh\u00f3m t\u1ed1t nh\u1ea5t v\u1edbi D1,3<\/sub> \u0111\u1ea1t t\u1eeb 12,68 – 12,81 cm, Hvn<\/sub> \u0111\u1ea1t t\u1eeb 14,24 – 14,39 m, Dt<\/sub> \u0111\u1ea1t t\u1eeb 3,55 – 3,64 m. Tr\u00ean \u0111i\u1ec1u ki\u1ec7n l\u1eadp \u0111\u1ecba \u0111\u1ea5t r\u1eebng sau khai th\u00e1c, n\u00ean s\u1eed d\u1ee5ng bi\u1ec7n ph\u00e1p ph\u00e1t, b\u0103m d\u1eadp th\u1ef1c b\u00ec t\u1ea1i ch\u1ed7 ho\u1eb7c ph\u00e1t, d\u1ecdn s\u1ea1ch th\u1ef1c b\u00ec to\u00e0n di\u1ec7n. M\u00fac h\u1ed1 b\u1eb1ng m\u00e1y 50 \u00b4 50 \u00b4 50 cm cho sinh tr\u01b0\u1edfng t\u1ed1t nh\u1ea5t v\u1edbi D1,3<\/sub> \u0111\u1ea1t 12,93 cm, Hvn<\/sub> 14,72 m v\u00e0 Dt<\/sub> \u0111\u1ea1t 3,66 m. Kh\u1ea3 n\u0103ng sinh tr\u01b0\u1edfng c\u1ee7a keo lai \u1edf c\u00e1c m\u1eadt \u0111\u1ed9 tr\u1ed3ng kh\u00e1c nhau c\u00f3 s\u1ef1 sai kh\u00e1c r\u00f5 r\u1ec7t, D1,3<\/sub> l\u1edbn nh\u1ea5t \u1edf m\u1eadt \u0111\u1ed9 1.110 c\u00e2y\/ha \u0111\u1ea1t 13,40 cm, gi\u1ea3m d\u1ea7n theo chi\u1ec1u t\u0103ng m\u1eadt \u0111\u1ed9; Hvn<\/sub> l\u1edbn nh\u1ea5t \u1edf m\u1eadt \u0111\u1ed9 1.660 c\u00e2y\/ha \u0111\u1ea1t 14,14 m, gi\u1ea3m d\u1ea7n theo chi\u1ec1u gi\u1ea3m c\u1ee7a m\u1eadt \u0111\u1ed9. M\u1eadt \u0111\u1ed9 tr\u1ed3ng r\u1eebng ban \u0111\u1ea7u t\u1eeb 1.110 – 1.330 c\u00e2y\/ha l\u00e0 ph\u00f9 h\u1ee3p v\u1edbi tr\u1ed3ng r\u1eebng g\u1ed7 l\u1edbn. B\u00f3n ph\u00e2n 200g NPK (5:10:3)\/c\u00e2y cho sinh tr\u01b0\u1edfng t\u1ed1t nh\u1ea5t v\u1edbi D1,3<\/sub> \u0111\u1ea1t 12,69 cm, Hvn<\/sub> l\u00e0 14,35 m v\u00e0 Dt<\/sub> l\u00e0 3,76 m. Sau 6,5 n\u0103m tr\u1ed3ng, c\u00f4ng th\u1ee9c m\u1eadt \u0111\u1ed9 \u0111\u1ec3 l\u1ea1i 1.300 c\u00e2y\/ha v\u00e0 1.100 c\u00e2y\/ha c\u00f3 tr\u1eef l\u01b0\u1ee3ng b\u00ecnh qu\u00e2n t\u1ed1t nh\u1ea5t t\u01b0\u01a1ng \u1ee9ng l\u00e0 170,04 m3<\/sup>\/ha v\u00e0 166,74 m3<\/sup>\/ha, DM \u0111\u1ea1t 26,16 v\u00e0 25,65 m3<\/sup>\/ha\/n\u0103m. S\u1ed1 c\u00e2y c\u00f3 (D1,3<\/sub> > 18 cm) ch\u1ec9 chi\u1ebfm 6% \u1edf c\u00f4ng th\u1ee9c T900 (Nht<\/sub> \u00bb 820 c\u00e2y\/ha). S\u1ed1 c\u00e2y c\u00f3 D1,3<\/sub> \u2265 15 – 18 cm \u0111\u1ea1t cao nh\u1ea5t \u1edf T900 l\u00e0 86,0% v\u00e0 th\u1ea5p nh\u1ea5t \u1edf T1500 l\u00e0 12,0%.<\/p>\n

T\u1eeb kh\u00f3a:<\/em> <\/strong>G\u1ed7 l\u1edbn, keo lai, k\u1ef9 thu\u1eadt l\u00e2m sinh, Qu\u1ea3ng Tr\u1ecb.<\/td>\n<\/tr>\n

\n

<\/a>Effects of silviculture techniques on the growth of Acacia hybrids plantation for sawlog in Quang Tri province<\/strong><\/p>\n

This paper introduces the results of studying the effects of silviculture techniques to improve the productivity and quality of Acacia hybrids plantation for sawlog in Quang Tri province. After 4.5 years of age, the experimental models had a survival rate of 86.67 – 92.5%, MAI (Mean Annual Increment) was reached 28.68 m3<\/sup>\/ha\/year. The formulas cutting and hashing vegetation on site and comprehensive clearance and clearing vegetation were have the best growth in the group with Diameter at Breast Height (DHB) was from 12.68 – 12.81 cm, Height (H) from 14.24 – 14.39 m, Canopy Diameter (CD) from 3.55 – 3.64 m. On the site condition of after logging, it was recommended to use the method of comprehensive clearance and clearing vegetation or comprehensive clearance and even organic materials spread on the ground. Digging holes by machine 50 \u00b4 50 \u00b4 50 cm has the best growth with DBH 12.93 cm, H 14.72 m and CD 3.66 m. The growth ability of Acacia hybrids at different planting densities was significantly different, DBH was gradually decreasing in the direction of increasing density and the largest DBH is 13.40 cm with density of 1,110 trees\/ha. H was gradually decreasing in the decreasing direction of density and the highest average Height reached 14.14 m with the density of 1,660 trees\/ha. The highest average CD reached 4.04 m with the density of 1,110 trees\/ha and the smallest CD is 3.56 m with density of 1,660 trees\/ha. The initial planting density of 1,110 – 1,330 trees\/ha are suitable for growing sawlog forests. Fertilizing 200g NPK (5: 10: 3)\/tree give the best growth with DBH reached 12.69 cm, H reached 14.35 m and CD reached 3.76 m. The thinning intensity has a marked effect on the growth and stock of the experiment.
\nAt 6.5-years old, the formula of 1,300 trees\/ha and 1,100 trees\/ha had the best average standing volume of 170.04 m3<\/sup>\/ha and 166.74 m3<\/sup>\/ha, MAI reached 26.16 and 25.65 m3<\/sup>\/ha\/year. The percentages of number of trees (DBH > 18 cm) was accounts for only 6% of the formula T900 (Nht \u00bb 820 trees\/ha). The highest percentages of number of trees (DBH \u2265 15 – 18 cm) in T900 was 86.0% and the lowest in T1500 was 12.0%.<\/p>\n

Keywords:<\/em><\/strong> Sawlog, Acacia hybrids, silviculture techniques, Quang Tri<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

<\/a>\u1ea2NH H\u01af\u1edeNG C\u1ee6A M\u1ed8T S\u1ed0 Y\u1ebeU T\u1ed0 SINH TH\u00c1I \u0110\u1ebeN
\nT\u00c1I SINH T\u1ef0 NHI\u00caN C\u1ee6A S\u1ebeN M\u1ee6 (Shorea roxburghii <\/em>G. Don)
\nTRONG R\u1eeaNG K\u00cdN TH\u01af\u1edcNG XANH \u1ea8M NHI\u1ec6T \u0110\u1edaI
\nT\u1ea0I KHU V\u1ef0C T\u00c2N PH\u00da THU\u1ed8C T\u1ec8NH \u0110\u1ed2NG NAI<\/p>\n

<\/a>L\u00ea H\u1ed3ng Vi\u1ec7t1<\/sup>, Tr\u1ea7n Quang B\u1ea3o2<\/sup><\/p>\n

Ph\u00e2n hi\u1ec7u Tr\u01b0\u1eddng \u0110\u1ea1i h\u1ecdc L\u00e2m nghi\u1ec7p t\u1ea1i t\u1ec9nh \u0110\u1ed3ng Nai
\n2Tr\u01b0\u1eddng \u0110\u1ea1i h\u1ecdc L\u00e2m nghi\u1ec7p<\/p>\n\n\n\n\n
T\u00d3M T\u1eaeT<\/p>\n

B\u00e0i b\u00e1o n\u00e0y gi\u1edbi thi\u1ec7u k\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u v\u1ec1 \u0111\u1eb7c t\u00ednh sinh th\u00e1i t\u00e1i sinh t\u1ef1 nhi\u00ean c\u1ee7a qu\u1ea7n th\u1ec3 S\u1ebfn m\u1ee7 d\u01b0\u1edbi t\u00e1n r\u1eebng k\u00edn th\u01b0\u1eddng xanh \u1ea9m nhi\u1ec7t \u0111\u1edbi t\u1ea1i khu v\u1ef1c T\u00e2n Ph\u00fa, t\u1ec9nh \u0110\u1ed3ng Nai. M\u1ee5c ti\u00eau c\u1ee7a nghi\u00ean c\u1ee9u n\u00e0y l\u00e0 x\u00e1c \u0111\u1ecbnh \u1ea3nh h\u01b0\u1edfng c\u1ee7a \u0111\u1ed9 \u01b0u th\u1ebf c\u00e2y m\u1eb9, c\u1ea5u tr\u00fac v\u00e0 s\u1ef1 c\u1ea1nh tranh gi\u1eefa nh\u1eefng c\u00e2y g\u1ed7 trong qu\u1ea7n th\u1ee5, \u0111\u1ed9 \u1ea9m v\u00e0 pHH2O<\/sub> c\u1ee7a t\u1ea7ng \u0111\u1ea5t m\u1eb7t \u0111\u1ebfn t\u00e1i sinh t\u1ef1 nhi\u00ean c\u1ee7a qu\u1ea7n th\u1ec3 S\u1ebfn m\u1ee7. \u0110\u1ed9 \u01b0u th\u1ebf c\u1ee7a c\u00e2y m\u1eb9, c\u1ea5u tr\u00fac qu\u1ea7n th\u1ee5 v\u00e0 s\u1ef1 c\u1ea1nh tranh gi\u1eefa nh\u1eefng c\u00e2y g\u1ed7 trong qu\u1ea7n th\u1ee5 \u0111\u00e3 \u0111\u01b0\u1ee3c thu th\u1eadp t\u1eeb 9 \u00f4 ti\u00eau chu\u1ea9n \u0111i\u1ec3n h\u00ecnh thu\u1ed9c tr\u1ea1ng th\u00e1i r\u1eebng gi\u00e0u. K\u00edch th\u01b0\u1edbc \u00f4 ti\u00eau chu\u1ea9n l\u00e0 0,25 ha. T\u00ecnh tr\u1ea1ng t\u00e1i sinh t\u1ef1 nhi\u00ean c\u1ee7a S\u1ebfn m\u1ee7 \u0111\u01b0\u1ee3c thu th\u1eadp t\u1eeb 90 \u00f4 d\u1ea1ng b\u1ea3n 16 m2<\/sup> (4 \u00b4 4 m). \u0110\u1ed9 \u1ea9m (%), pHH2O<\/sub> \u1edf t\u1ea7ng \u0111\u1ea5t m\u1eb7t trong quan h\u1ec7 v\u1edbi \u0111\u1ed9 b\u1eaft g\u1eb7p (1, 0) c\u00e2y t\u00e1i sinh S\u1ebfn m\u1ee7 \u0111\u01b0\u1ee3c thu th\u1eadp t\u1eeb 125 \u0111i\u1ec3m kh\u00e1c nhau. K\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u \u0111\u00e3 ch\u1ec9 ra r\u1eb1ng s\u1ef1 bi\u1ebfn \u0111\u1ed5i v\u1ec1 \u0111\u1ed9 \u01b0u th\u1ebf c\u1ee7a c\u00e2y m\u1eb9, c\u1ea5u tr\u00fac v\u00e0 s\u1ef1 c\u1ea1nh tranh gi\u1eefa nh\u1eefng c\u00e2y g\u1ed7 trong qu\u1ea7n th\u1ee5 v\u00e0 \u0111\u1eb7c t\u00ednh c\u1ee7a t\u1ea7ng \u0111\u1ea5t m\u1eb7t \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn t\u00e1i sinh t\u1ef1 nhi\u00ean c\u1ee7a qu\u1ea7n th\u1ec3 S\u1ebfn m\u1ee7. S\u1ebfn m\u1ee7 t\u00e1i sinh li\u00ean t\u1ee5c d\u01b0\u1edbi t\u00e1n r\u1eebng. Ch\u1ec9 s\u1ed1 IVI c\u1ee7a c\u00e2y m\u1eb9 t\u1eeb 25 – 35%, ch\u1ec9 s\u1ed1 ph\u1ee9c t\u1ea1p v\u1ec1 c\u1ea5u tr\u00fac qu\u1ea7n th\u1ee5 nh\u1ecf h\u01a1n 0,5 v\u00e0 ch\u1ec9 s\u1ed1 c\u1ea1nh tranh t\u00e1n gi\u1eefa nh\u1eefng c\u00e2y g\u1ed7 nh\u1ecf h\u01a1n 1,5, \u0111\u1ed9 \u1ea9m \u1edf t\u1ea7ng \u0111\u1ea5t m\u1eb7t dao \u0111\u1ed9ng t\u1eeb 60 – 80% v\u00e0 pHH2O<\/sub> dao \u0111\u1ed9ng t\u1eeb 3,8 – 4,6 l\u00e0 \u0111i\u1ec1u ki\u1ec7n th\u00edch h\u1ee3p \u0111\u1ed1i v\u1edbi t\u00e1i sinh t\u1ef1 nhi\u00ean c\u1ee7a S\u1ebfn m\u1ee7.<\/p>\n

T\u1eeb kh\u00f3a:<\/em><\/strong> R\u1eebng k\u00edn th\u01b0\u1eddng xanh \u1ea9m nhi\u1ec7t \u0111\u1edbi, qu\u1ea7n x\u00e3 th\u1ef1c v\u1eadt r\u1eebng, \u0111\u1ed9 \u01b0u th\u1ebf c\u1ee7a c\u00e2y m\u1eb9, t\u00e1i sinh t\u1ef1 nhi\u00ean, ch\u1ec9 s\u1ed1 ph\u1ee9c t\u1ea1p v\u1ec1 c\u1ea5u tr\u00fac qu\u1ea7n th\u1ee5, ch\u1ec9 s\u1ed1 c\u1ea1nh tranh t\u00e1n<\/td>\n<\/tr>\n

\n

<\/a>The effect of ecological factors to natural regeneration of Shorea roxburghii <\/em>G. Don in tropical moist evergreen closed forest at Tan Phu zone of Dong Nai province<\/strong><\/p>\n

The article presents result of the natural regeneration characteristics of the population of Shorea roxburghii <\/em>under the canopy of the moist tropical evergreen closed forest in Tan Phu area, Dong Nai province. The objective of this study is to determine the effect of dominance of mother tree, structure and competition between trees in the stands, moisture content and pHH2O<\/sub> of topsoil to the natural regeneration of the population of Shorea roxburghii<\/em>. Data were collected from 9 typical plots of rich forest type. The plot size is 0.25 ha. The natural regeneration of Shorea roxburghii<\/em> is collected from 90 sub-plots of 16 m2<\/sup> (4 \u00b4 4 m). Moisture content (%), pHH2O<\/sub> in the topsoil in relation to the appearance of (1, 0) Shorea roxburghii<\/em> saplings collected from 125 different points. Research results have shown that changes in the dominance of mother trees, the structure and competition between trees in the stands and the characteristics of topsoil affect the natural regeneration of the Shorea roxburghii<\/em> population. The population of Shorea roxburghii<\/em> regenerates continuously under the forest canopy. The IVI index of the mother tree is from 25% to 35%, the structural complexity index is less than 0.5 and the crown competition index between trees is less than 1.5, the moisture in the topsoil ranges from 60 – 80% and pHH2O<\/sub> ranges from 3.8 to 4.6 are suitable conditions for natural regeneration of the Shorea roxburghii<\/em> population.<\/p>\n

Keywords:<\/em><\/strong> Tropical moist evergreen closed forest, Forest plant community, Dominance of mother tree, Natural regeneration, Index of stand structural complexity, Crown competition index<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

<\/a>\u1ea2NH H\u01af\u1edeNG C\u1ee6A T\u1ec8A TH\u01afA \u0110\u1ebeN SINH TR\u01af\u1edeNG C\u1ee6A KEO TAI T\u01af\u1ee2NG (Acacia mangium <\/em>Willd)
\nT\u1ea0I Y\u00caN TH\u1ebe, B\u1eaeC GIANG<\/p>\n

<\/a>Ph\u1ea1m Qu\u1ed1c Chi\u1ebfn1<\/sup>, L\u00f2 Quang Th\u00e0nh2<\/sup>, \u0110\u1eb7ng Th\u1ecbnh Tri\u1ec1u2<\/sup>, D\u01b0\u01a1ng Quang Trung2<\/sup><\/p>\n

1<\/sup> Ban qu\u1ea3n l\u00fd c\u00e1c d\u1ef1 \u00e1n L\u00e2m nghi\u1ec7p
\n2<\/sup> Vi\u1ec7n Nghi\u00ean c\u1ee9u L\u00e2m sinh – Vi\u1ec7n Khoa h\u1ecdc L\u00e2m nghi\u1ec7p Vi\u1ec7t Nam<\/p>\n\n\n\n\n
T\u00d3M T\u1eaeT<\/p>\n

Nghi\u00ean c\u1ee9u \u1ea3nh h\u01b0\u1edfng c\u1ee7a t\u1ec9a th\u01b0a \u0111\u1ebfn sinh tr\u01b0\u1edfng, \u0111\u1ed9 t\u00e0n che v\u00e0 kh\u1ea3 n\u0103ng quang h\u1ee3p c\u1ee7a Keo tai t\u01b0\u1ee3ng \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n t\u1ea1i huy\u1ec7n Y\u00ean Th\u1ebf, t\u1ec9nh B\u1eafc Giang. K\u1ebft qu\u1ea3 cho th\u1ea5y, sau 5 n\u0103m th\u00ed nghi\u1ec7m, chi\u1ec1u cao c\u1ee7a c\u00e2y kh\u00f4ng b\u1ecb \u1ea3nh h\u01b0\u1edfng b\u1edfi c\u01b0\u1eddng \u0111\u1ed9 t\u1ec9a th\u01b0a. Ng\u01b0\u1ee3c l\u1ea1i, \u0111\u01b0\u1eddng k\u00ednh ngang ng\u1ef1c c\u1ee7a c\u00e2y trong c\u00e1c c\u00f4ng th\u1ee9c c\u00f3 s\u1ef1 kh\u00e1c nhau r\u00f5 r\u1ec7t, trong \u0111\u00f3, c\u00f4ng th\u1ee9c t\u1ec9a th\u01b0a \u0111\u1ec3 l\u1ea1i 600 c\u00e2y\/ha c\u00f3 \u0111\u01b0\u1eddng k\u00ednh l\u1edbn nh\u1ea5t (17,64 cm), sau \u0111\u00f3 l\u1ea7n l\u01b0\u1ee3t \u0111\u1ebfn \u0111\u01b0\u1eddng k\u00ednh c\u1ee7a c\u00e2y trong c\u00f4ng th\u1ee9c 800 c\u00e2y\/ha (16,55 cm) v\u00e0 c\u00f4ng th\u1ee9c 1100 c\u00e2y\/ha (15,27cm). \u0110\u1ed9 t\u00e0n che c\u1ee7a c\u00e2y trong c\u00e1c c\u00f4ng th\u1ee9c \u0111\u1ea1t 78,94% (800 c\u00e2y\/ha); 78,21% (1080 c\u00e2y\/ha); v\u00e0 77,55% (600 c\u00e2y\/ha) v\u00e0 kh\u00f4ng c\u00f3 s\u1ef1 kh\u00e1c nhau r\u00f5 r\u1ec7t gi\u1eefa c\u00e1c c\u00f4ng th\u1ee9c th\u00ed nghi\u1ec7m. Ch\u1ec9 s\u1ed1 di\u1ec7n t\u00edch t\u00e1n l\u00e1 \u1edf c\u00f4ng th\u1ee9c t\u1ec9a th\u01b0a \u0111\u1ec3 l\u1ea1i 600 c\u00e2y\/ha l\u00e0 1,26 m2<\/sup>m-2<\/sup> v\u00e0 th\u1ea5p h\u01a1n so v\u1edbi c\u00f4ng th\u1ee9c 800 c\u00e2y\/ha (1,72 m2<\/sup>m-2<\/sup>) v\u00e0 c\u00f4ng th\u1ee9c 1080 c\u00e2y\/ha (1,71 m2<\/sup>m-2<\/sup>). C\u00f4ng th\u1ee9c 600 c\u00e2y\/ha c\u00f3 c\u01b0\u1eddng \u0111\u1ed9 quang h\u1ee3p trung b\u00ecnh trong ng\u00e0y l\u1edbn nh\u1ea5t (6,64 \u03bcmolm–<\/sup>2<\/sup>gi\u00e2y-1<\/sup>) v\u00e0 kh\u00e1c bi\u1ec7t r\u00f5 r\u1ec7t so v\u1edbi c\u00f4ng th\u1ee9c 800 c\u00e2y\/ha (5,13 \u03bcmolm–<\/sup>2<\/sup>gi\u00e2y-1<\/sup>) v\u00e0 1080 c\u00e2y\/ha (5,18 \u03bcmolm–<\/sup>2<\/sup>gi\u00e2y-1<\/sup>).<\/p>\n

T\u1eeb kh\u00f3a:<\/em><\/strong> Keo tai t\u01b0\u1ee3ng (Acacia mangium<\/em>), t\u1ec9a th\u01b0a, ch\u1ec9 s\u1ed1 di\u1ec7n t\u00edch t\u00e1n l\u00e1, quang h\u1ee3p<\/td>\n<\/tr>\n

\n

<\/a>Effects of thinning on the growth of Acacia mangium Willd in Yen The district, Bac Giang province<\/strong><\/p>\n

Effects of thinning on the growth, canopy, leaf area index and photosynthesis of Acacia mangium<\/em> Willd were carried out in Yen The district, Bac Giang province. The results showed that, after 5 years of experiment, the height of the tree was not significantly affected by thinning intensity, whereas the diameter at breast height (DBH) of trees in the treatments had significant differences, in which the thinning treatment of 600 trees\/ha had largest diameter (17.64cm), followed by the DBH of the tree in the treatment of 800 trees\/ha (16.55cm) and 1080 trees\/ha (15.27cm). The canopy of trees in the treatments was 78.94% (800 trees\/ha), 78.21% for treatment of 1080 trees\/ha and 77.55% (600 trees\/ha) and no significant difference between the treatments. The leaf area index of the treatment of 600 trees\/ha (1.26 m2<\/sup>m-2<\/sup>) was significantly different with both of two treatments of 800 trees\/ha (1.72 m2<\/sup>m-2<\/sup>) and treatment of 1,080 trees\/ha (1.71 m2<\/sup>m-2<\/sup>). The treatment of 600 tree\/ha had highest photosynthesis with (6.64 \u03bcmolm–<\/sup>2<\/sup>s–<\/sup>1<\/sup>) and was significantly different from the treatment of 800 trees\/ha (5.13 \u03bcmolm-2<\/sup>s-1<\/sup>) and the treatment of 1080 trees\/ha (5.18 \u03bcmolm-2<\/sup>s-1<\/sup>).<\/p>\n

Keywords:<\/em><\/strong> Acacia mangium<\/em>, thinning, leaf area index (LAI), photosynthesis<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

<\/a>NGHI\u00caN C\u1ee8U KH\u1ea2 N\u0102NG H\u1ea4P TH\u1ee4 CO2<\/sub> C\u1ee6A R\u1eeaNG TR\u1ed2NG SA M\u1ed8C (Cunninghamia lanceolata <\/em>Hook) \u1ede C\u00c1C TU\u1ed4I KH\u00c1C NHAU T\u1ea0I M\u01af\u1edcNG KH\u01af\u01a0NG – L\u00c0O CAI<\/p>\n

<\/a>\u0110o\u00e0n Doanh Ti\u1ebfn1<\/sup>, Nguy\u1ec5n Th\u1ecb Thu Hi\u1ec1n2*<\/sup>, \u0110\u1ed7 Ho\u00e0ng Chung2<\/sup><\/p>\n

1<\/sup>H\u1ea1t Ki\u1ec3m l\u00e2m huy\u1ec7n M\u01b0\u1eddng Kh\u01b0\u01a1ng – L\u00e0o Cai
\n2<\/sup>Khoa L\u00e2m nghi\u1ec7p – Tr\u01b0\u1eddng \u0110\u1ea1i h\u1ecdc N\u00f4ng L\u00e2m Th\u00e1i Nguy\u00ean<\/p>\n\n\n\n\n
T\u00d3M T\u1eaeT<\/p>\n

Nghi\u00ean c\u1ee9u v\u1ec1 kh\u1ea3 n\u0103ng h\u1ea5p th\u1ee5 CO2<\/sub> c\u1ee7a r\u1eebng tr\u1ed3ng Sa m\u1ed9c (Cunninghamia lanceolata<\/em> Hook) t\u1ea1i L\u00e0o Cai nh\u1eb1m g\u00f3p ph\u1ea7n l\u00e0m c\u01a1 s\u1edf \u0111\u00e1nh gi\u00e1 cho chi tr\u1ea3 d\u1ecbch v\u1ee5 m\u00f4i tr\u01b0\u1eddng th\u00f4ng qua c\u00e1c d\u1ef1 \u00e1n tr\u1ed3ng r\u1eebng n\u00f3i chung v\u00e0 \u0111\u1eb7c bi\u1ec7t tr\u1ed3ng r\u1eebng CDM. Nghi\u00ean c\u1ee9u n\u00e0y \u0111\u01b0\u1ee3c ti\u1ebfn h\u00e0nh \u1edf 4 c\u1ea5p tu\u1ed5i 5, 7, 9 v\u00e0 11 \u0111\u1ed1i v\u1edbi r\u1eebng Sa m\u1ed9c. Ph\u01b0\u01a1ng ph\u00e1p l\u1eadp tuy\u1ebfn \u0111i\u1ec1u tra, l\u1eadp \u00f4 ti\u00eau chu\u1ea9n v\u00e0 gi\u1ea3i t\u00edch c\u00e2y ti\u00eau chu\u1ea9n \u0111\u00e3 \u0111\u01b0\u1ee3c ti\u1ebfn h\u00e0nh thu th\u1eadp. C\u00e1c m\u1eabu \u0111\u00e3 \u0111\u01b0\u1ee3c ti\u1ebfn h\u00e0nh \u0111o \u0111\u1ebfm v\u00e0 s\u1ea5y kh\u00f4 \u1edf ph\u00f2ng th\u00ed nghi\u1ec7m. K\u1ebft qu\u1ea3 cho th\u1ea5y, t\u1ed5ng sinh kh\u1ed1i t\u01b0\u01a1i v\u00e0 kh\u00f4 Sa m\u1ed9c c\u1ea5p tu\u1ed5i 5, 7, 9 v\u00e0 11 \u0111\u1ec1u t\u1eadp trung nhi\u1ec1u nh\u1ea5t \u1edf b\u1ed9 ph\u1eadn th\u00e2n c\u00e2y, ti\u1ebfp \u0111\u00f3 l\u00e0 b\u1ed9 ph\u1eadn c\u00e0nh, th\u1ea5p nh\u1ea5t l\u00e0 b\u1ed9 ph\u1eadn l\u00e1. T\u1ed5ng l\u01b0\u1ee3ng Carbon t\u00edch l\u0169y l\u00e0 4,001 t\u1ea5n C\/ha \u1edf c\u1ea5p tu\u1ed5i 5; 10,039 t\u1ea5n C\/ha \u1edf c\u1ea5p tu\u1ed5i 7; 14,762 t\u1ea5n C\/ha \u1edf c\u1ea5p tu\u1ed5i 7 v\u00e0 19,564 t\u1ea5n C\/ha \u1edf c\u1ea5p tu\u1ed5i 11. Kh\u1ea3 n\u0103ng h\u1ea5p th\u1ee5 CO2<\/sub> c\u1ee7a r\u1eebng Sa m\u1ed9c tu\u1ed5i 5 \u0111\u1ea1t 3,009 t\u1ea5n\/ha; \u1edf tu\u1ed5i 7 \u0111\u1ea1t 5,581 t\u1ea5n\/ha; \u1edf tu\u1ed5i 8 \u0111\u1ea1t 6,167 t\u1ea5n\/ha v\u00e0 \u0111\u1ea1t 6,687 t\u1ea5n\/ha \u0111\u1ed1i v\u1edbi r\u1eebng tu\u1ed5i 11.<\/p>\n

T\u1eeb kh\u00f3a:<\/em><\/strong> H\u1ea5p th\u1ee5, CO2<\/sub>, M\u01b0\u1eddng Kh\u01b0\u01a1ng, L\u00e0o Cai, r\u1eebng tr\u1ed3ng, Sa m\u1ed9c<\/td>\n<\/tr>\n

\n

<\/a>The CO2<\/sub> absorptive capacity of Cunninghamia lanceolata<\/em> plantation at the different ages in Muong Khuong district, Lao Cai province<\/strong><\/p>\n

This study focus on CO2<\/sub> absorptive capacity of Cunninghamia lanceolata <\/em>Hook plantation in Lao Cai which provided a basic line for payment of environmental services on general plantation and special reforestation CDM. This study was conducted at four different level plantation at 5, 7, 9 and 11 yearolds. Field surveys, standard samples and field standards tree analysis were conducted to collect data in the fields. Then, the samples were analysed in laboratory. Results showed that total fresh biomass and dry biomass for the plantation of 5, 7, 9 and 11 yearolds are concentrated mostly in parts of the trunk, then the scene twigs, and the lowest parts of leaves. The total carbon accumulation is 4.001 tones C\/ha at the plantation of 5 yearolds, 10.039 tones C\/ha at the plantation of 7 yearolds, 14.762 tones C\/ha at the plantation of 9 yearolds and 19.564 tones C\/ha at the plantation of 11 yearolds. The CO\u00ad2<\/sub> absorb ability is 3.009 tones\/ha at the plantation of 5 yearolds, 5.581 tones\/ha at the plantation of 7 yearolds, 6.167 tones\/ha at the plantation of 9 yearolds and 6.687 tones\/ha at the plantation of 11 yearolds.<\/p>\n

Keywords:<\/em><\/strong> Absorption, CO2<\/sub>, Muong Khuong, Lao Cai, plantation, Cunninghamia lanceolata<\/em><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

<\/a>\u1ea2NH H\u01af\u1edeNG C\u1ee6A THU\u1ed0C H\u00d3A H\u1eccC \u0110\u1ebeN M\u1eccT \u0110\u1ee4C TH\u00c2N Euwallacea fornicatus <\/em>(Eichhoff)
\n\u0102N N\u1ea4M B\u1ec6NH Fusarium euwallacea<\/em> TRONG \u0110I\u1ec0U KI\u1ec6N PH\u00d2NG TH\u00cd NGHI\u1ec6M<\/p>\n

<\/a>B\u00f9i Quang Ti\u1ebfp, Nguy\u1ec5n V\u0103n Nam<\/p>\n

Trung t\u00e2m Nghi\u00ean c\u1ee9u B\u1ea3o v\u1ec7 r\u1eebng<\/p>\n\n\n\n\n
T\u00d3M T\u1eaeT<\/p>\n

Keo tai t\u01b0\u1ee3ng v\u00e0 keo lai l\u00e0 hai lo\u00e0i c\u00e2y tr\u1ed3ng l\u00e2m nghi\u1ec7p ch\u1ee7 l\u1ef1c trong chi\u1ebfn l\u01b0\u1ee3c ph\u00e1t tri\u1ec3n kinh t\u1ebf c\u1ee7a t\u1ec9nh Ph\u00fa Th\u1ecd. S\u1ef1 ph\u00e1t tri\u1ec3n tr\u1ed3ng r\u1eebng thu\u1ea7n lo\u00e0i hai lo\u00e0i c\u00e2y n\u00e0y tr\u00ean quy m\u00f4 di\u1ec7n t\u00edch r\u1ed9ng t\u1ea1o ra \u0111i\u1ec1u ki\u1ec7n m\u00f4i tr\u01b0\u1eddng thu\u1eadn l\u1ee3i cho s\u1ef1 ph\u00e1t tri\u1ec3n c\u1ee7a m\u1ed9t s\u1ed1 lo\u00e0i s\u00e2u, b\u1ec7nh h\u1ea1i. C\u00e1c lo\u00e0i s\u00e2u, b\u1ec7nh h\u1ea1i l\u00e0 t\u00e1c nh\u00e2n l\u00e0m gi\u1ea3m ch\u1ea5t l\u01b0\u1ee3ng, tr\u1eef l\u01b0\u1ee3ng c\u1ee7a g\u1ed7 keo. Gi\u1eefa c\u00e1c lo\u00e0i s\u00e2u h\u1ea1i, M\u1ecdt \u0111\u1ee5c th\u00e2n Euwallacea fornicatus<\/em> l\u00e0 lo\u00e0i nguy hi\u1ec3m \u0111\u1ed1i v\u1edbi Keo tai t\u01b0\u1ee3ng v\u00e0 keo lai \u1edf Ph\u00fa Th\u1ecd. Lo\u00e0i M\u1ecdt \u0111\u1ee5c th\u00e2n n\u00e0y c\u00f3 quan h\u1ec7 c\u1ed9ng sinh v\u1edbi lo\u00e0i n\u1ea5m b\u1ec7nh Fusarrium euwallacea<\/em>. B\u00e0o t\u1eed c\u1ee7a n\u1ea5m b\u1ec7nh n\u00e0y b\u00e1m v\u00e0o g\u1ed1c r\u00e2u \u0111\u1ea7u v\u00e0 r\u00e2u mi\u1ec7ng M\u1ecdt \u0111\u1ee5c th\u00e2n c\u00e1i E. fornicatus <\/em>\u0111\u1ec3 ph\u00e1t t\u00e1n. S\u1ef1 n\u1ea3y m\u1ea7m, ph\u00e1t tri\u1ec3n c\u1ee7a n\u1ea5m b\u1ec7nh F<\/em>. euwallacea<\/em> di\u1ec5n ra \u1edf th\u00e0nh \u0111\u01b0\u1eddng hang v\u00e0 l\u00e0 ngu\u1ed3n th\u1ee9c \u0103n c\u1ee7a \u1ea5u tr\u00f9ng v\u00e0 tr\u01b0\u1edfng th\u00e0nh M\u1ecdt \u0111\u1ee5c th\u00e2n E. fornicatus<\/em>. V\u00ec v\u1eady nghi\u00ean c\u1ee9u n\u00e0y nh\u1eb1m t\u00ecm ra hi\u1ec7u l\u1ef1c c\u1ee7a thu\u1ed1c h\u00f3a h\u1ecdc \u0111\u1ed1i v\u1edbi n\u1ea5m b\u1ec7nh F. <\/em>e<\/em>uwallacea<\/em>. K\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u cho th\u1ea5y c\u00e1c ho\u1ea1t ch\u1ea5t Mancozeb, Forsetyl-Aluminium, Chlorothalinil v\u00e0 Chlorothalinil + Metalaxyl c\u00f3 kh\u1ea3 n\u0103ng \u1ee9c ch\u1ebf s\u1ef1 ph\u00e1t tri\u1ec3n c\u1ee7a n\u1ea5m b\u1ec7nh trong \u0111i\u1ec1u ki\u1ec7n ph\u00f2ng th\u00ed nghi\u1ec7m. Ho\u1ea1t ch\u1ea5t Mancozeb c\u00f3 hi\u1ec7u l\u1ef1c ng\u0103n ch\u1eb7n s\u1ef1 ph\u00e1t tri\u1ec3n c\u1ee7a n\u1ea5m b\u1ec7nh t\u1ed1t nh\u1ea5t sau 7 ng\u00e0y. \u0110\u00e2y l\u00e0 c\u01a1 s\u1edf khoa h\u1ecdc g\u00f3p ph\u1ea7n qu\u1ea3n l\u00fd gi\u00e1n ti\u1ebfp lo\u00e0i M\u1ecdt \u0111\u1ee5c th\u00e2n E. fornicatus.<\/em><\/p>\n

T\u1eeb kh\u00f3a:<\/em><\/strong> \u0110i\u1ec1u ki\u1ec7n ph\u00f2ng th\u00ed nghi\u1ec7m, Fusarium euwallacea,<\/em> Euwallacea fornicatus<\/em>, thu\u1ed1c h\u00f3a h\u1ecdc, \u1ee9c ch\u1ebf ph\u00e1t tri\u1ec3n<\/td>\n<\/tr>\n

\n

<\/a>Effect of fungicides on shot hole borer Euwallacea fornicatus<\/em> (Eichhoff) feeding pathogenic fungus Fusarium euwallacea<\/em> under laboratory conditions<\/strong><\/p>\n

Acacia mangium<\/em> and Acacia hybrid are two major forestry tree species in the economic development strategy in Phu Tho province. Development of planting the trees with extensive areas is one of stable evironments for a number of pests and diseases. Pests are important factors limiting the productivity and quality of acacia wood. Among the pests, the shot hole borer Euwallacea fornicatus<\/em> is one of the most serious pests of A.<\/em> mangium<\/em> and A. hybrid in Phu Tho province. The E. <\/em>f<\/em>ornicatus<\/em> has a symbiotic relation with the pathogenic fungus Fusarium euwallacea<\/em>. The funvagal spores are carried and spreaded by the female beetle in special organs located in the buccal cavity of head. Germination of the F. euwallacea<\/em> spores is on the wall of the stem galleries and is feeding source of the grubs and adults. Therefore, the purpose of th\u00ed study is fiding the effect of fungicde on the fungus F. euwallacea<\/em>. Results showed that Mancozeb, Forsetyl-Aluminium, Chlorothalinil and Chlorothalinil + Metalaxyl having valuable reduction to growth of the mycelial fungus. Mancozeb has most effective to inhibition of growth germination of the fungus during 7 days of observation under laboratory conditions. The results of the experiment will contribute an indirect control of shot hole borer E. fornicatus.<\/em><\/p>\n

Keywords:<\/em><\/strong> Laboratory conditions, Fusarium euwallacea<\/em>, Euwallacea fornicatus<\/em>, fungicide, growth inhibition<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

TH\u1ea8M \u0110\u1ecaNH C\u00c1C PH\u01af\u01a0NG PH\u00c1P T\u1ea0O C\u00c2Y TH\u1ee6Y T\u00d9NG
\n(Glyptostrobus pensilis<\/em> (Staunton ex D.Don) K.Koch)<\/p>\n

Tr\u1ea7n \u0110\u1ee9c Tr\u1ecdng1<\/sup>, Tr\u1ea7n Xu\u00e2n Ph\u01b0\u1edbc1<\/sup>, V\u00f5 Th\u00e0nh T\u00e1m1<\/sup>, Phan Thanh Tu\u1ea5n1<\/sup>
\nTr\u1ecbnh Duy H\u1ea3i1<\/sup>, L\u00ea V\u0103n Huy1<\/sup>, Ph\u1ea1m Quang Phong1<\/sup>, B\u1ea3o Huy2<\/sup><\/p>\n

1<\/sup>Khu b\u1ea3o t\u1ed3n lo\u00e0i v\u00e0 sinh c\u1ea3nh Th\u1ee7y t\u00f9ng;
\n2<\/sup>Tr\u01b0\u1eddng \u0110\u1ea1i h\u1ecdc T\u00e2y Nguy\u00ean<\/p>\n\n\n\n\n
T\u00d3M T\u1eaeT<\/p>\n

Th\u1ee7y t\u00f9ng (Glyptostrobus penilis<\/em> (Staunton ex D.Don) K.Koch) l\u00e0 m\u1ed9t trong nh\u1eefng lo\u00e0i c\u1ed5 x\u01b0a nh\u1ea5t hi\u1ec7n c\u00f2n c\u1ee7a c\u00e2y l\u00e1 kim tr\u00ean th\u1ebf gi\u1edbi v\u00e0 \u0111\u00e2y l\u00e0 lo\u00e0i \u0111\u1eb7c bi\u1ec7t c\u1ea7n \u01b0u ti\u00ean b\u1ea3o t\u1ed3n t\u1ea1i Vi\u1ec7t Nam. Nghi\u00ean c\u1ee9u n\u00e0y th\u1ea9m \u0111\u1ecbnh c\u00e1c ph\u01b0\u01a1ng ph\u00e1p t\u1ea1o c\u00e2y Th\u1ee7y t\u00f9ng bao g\u1ed3m gh\u00e9p c\u00e0nh Th\u1ee7y t\u00f9ng tr\u00ean c\u00e2y con B\u1ee5t m\u1ecdc (Taxodium distichum<\/em> (L.) Rich.) (260 c\u00e2y), gi\u00e2m hom c\u00e0nh Th\u1ee7y t\u00f9ng (142 c\u00e2y); v\u00e0 gh\u00e9p m\u1eaft c\u00e0nh Th\u1ee7y t\u00f9ng tr\u00ean r\u1ec5 th\u1edf c\u1ee7a n\u00f3 (20 c\u00e2y); ch\u1ec9 ti\u00eau \u0111\u00e1nh gi\u00e1 l\u00e0 t\u1ef7 l\u1ec7 s\u1ed1ng, sinh tr\u01b0\u1edfng, t\u0103ng tr\u01b0\u1eddng chi\u1ec1u cao, \u0111\u01b0\u1eddng k\u00ednh c\u00e2y. K\u1ebft qu\u1ea3 cho th\u1ea5y ph\u01b0\u01a1ng ph\u00e1p gh\u00e9p m\u1eaft c\u00e0nh Th\u1ee7y t\u00f9ng tr\u00ean r\u1ec5 th\u1edf c\u1ee7a n\u00f3 l\u00e0 kh\u1ea3 thi v\u00e0 c\u00f3 hi\u1ec7u qu\u1ea3 \u0111\u1ec3 b\u1ea3o t\u1ed3n in-situ<\/em> v\u00e0 ph\u1ee5c h\u1ed3i c\u00e1c qu\u1ea7n th\u1ec3 Th\u1ee7y t\u00f9ng.<\/p>\n

T\u1eeb kh\u00f3a:<\/em><\/strong> Ch\u00ednh s\u00e1ch l\u00e2m nghi\u1ec7p, c\u1ed9ng \u0111\u1ed3ng d\u00e2n t\u1ed9c thi\u1ec3u s\u1ed1, r\u1eebng b\u1ec1n v\u1eefng, sinh k\u1ebf c\u1ed9ng \u0111\u1ed3ng, T\u00e2y Nguy\u00ean<\/td>\n<\/tr>\n

\n

Assessment of methods for generating plants of Glyptostrobus pensilis <\/em>(Staunton ex D.Don) K. Koch<\/strong><\/p>\n

Glyptostrobus penilis<\/em> (Staunton ex D.Don) K. Koch is one of the most ancient extant conifers in the world, and this is a special species that needs to be prioritized for conservation in Vietnam. This study assessed methods of generating the plant of Glyptostrobus penilis<\/em> including grafting branches of Glyptostrobus penilis<\/em> on growing seedlings of Taxodium distichum<\/em> (L.) Rich. (260 plants), creating seedlings from branches of Glyptostrobus penilis <\/em>(142 plants); and grafting branches of Glyptostrobus penilis<\/em> on its breathing roots (20 plants); the evaluation indicators are survival rate, growth and increment of tree height and diameter. As a result showed that grafting branches on its breathing roots was feasible and effective for in-situ<\/em> conservation and restoration of the populations of Glyptostrobus penilis<\/em>.<\/p>\n

Keywords: <\/em><\/strong>Glyptostrobus pensilis<\/em>, method for generating plant<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

<\/a>X\u00c1C \u0110\u1ecaNH TU\u1ed4I TH\u00c0NH TH\u1ee4C KINH T\u1ebe C\u1ee6A LO\u00c0I KEO LAI (Acacia <\/em>mangium <\/em>\u00d7<\/em> A. auriculiformis<\/em>)
\nTHEO M\u1ee4C \u0110\u00cdCH KINH DOANH<\/p>\n

<\/a>Ph\u1ea1m Th\u1ecb Luy\u1ec7n1<\/sup>, V\u0169 Duy V\u0103n2<\/sup>, Nguy\u1ec5n Quang H\u00e03<\/sup><\/p>\n

1<\/sup>Trung t\u00e2m Nghi\u00ean c\u1ee9u Kinh t\u1ebf L\u00e2m nghi\u1ec7p
\n2<\/sup>V\u0103n ph\u00f2ng \u0111o\u00e0n \u0111\u1ea1i bi\u1ec3u Qu\u1ed1c h\u1ed9i, H\u1ed9i \u0111\u1ed3ng nh\u00e2n d\u00e2n v\u00e0 UBND t\u1ec9nh Qu\u1ea3ng Ninh
\n3<\/sup>\u0110\u1ea1i h\u1ecdc N\u00f4ng L\u00e2m B\u1eafc Giang<\/p>\n

\u00a0<\/em><\/p>\n\n\n\n\n
T\u00d3M T\u1eaeT<\/p>\n

B\u00e0i b\u00e1o \u0111\u00e3 \u0111\u01b0a ra \u0111\u01b0\u1ee3c c\u00e1c ph\u01b0\u01a1ng \u00e1n l\u1ef1a ch\u1ecdn tu\u1ed5i khai th\u00e1c r\u1eebng tr\u1ed3ng t\u1ed1i \u01b0u v\u1ec1 kinh t\u1ebf c\u1ee7a lo\u00e0i c\u00e2y keo lai theo c\u00e1c m\u1ee5c \u0111\u00edch kinh doanh s\u1ea3n ph\u1ea9m g\u1ed7 kh\u00e1c nhau. K\u1ebft qu\u1ea3 cho th\u1ea5y: tu\u1ed5i th\u00e0nh th\u1ee5c kinh t\u1ebf c\u1ee7a lo\u00e0i c\u00e2y keo lai v\u1edbi m\u1ee5c \u0111\u00edch kinh doanh \u0111a s\u1ea3n ph\u1ea9m l\u00e0 tu\u1ed5i 12, ng\u01b0\u1ee1ng th\u00e0nh th\u1ee5c c\u00f3 th\u1ec3 t\u1eeb 11 – 12 tu\u1ed5i; tu\u1ed5i th\u00e0nh th\u1ee5c kinh t\u1ebf cho m\u1ee5c \u0111\u00edch kinh doanh g\u1ed7 \u0111\u1ed3 m\u1ed9c l\u00e0 13 tu\u1ed5i, ng\u01b0\u1ee1ng th\u00e0nh th\u1ee5c l\u00e0 t\u1eeb 12 – 13 tu\u1ed5i; tu\u1ed5i th\u00e0nh th\u1ee5c kinh t\u1ebf cho m\u1ee5c \u0111\u00edch kinh doanh s\u1ea3n ph\u1ea9m g\u1ed7 x\u1ebb, b\u00f3c, v\u00e1n gh\u00e9p thanh l\u00e0 tu\u1ed5i12, ng\u01b0\u1ee1ng th\u00e0nh th\u1ee5c l\u00e0 11 – 12 tu\u1ed5i; tu\u1ed5i th\u00e0nh th\u1ee5c cho m\u1ee5c \u0111\u00edch s\u1ea3n ph\u1ea9m d\u0103m l\u00e0 tu\u1ed5i 6, ng\u01b0\u1ee1ng th\u00e0nh th\u1ee5c l\u00e0 t\u1eeb 5 – 6 tu\u1ed5i. Qua \u0111\u00e2y, ng\u01b0\u1eddi d\u00e2n c\u00f3 th\u1ec3 l\u1ef1a ch\u1ecdn \u0111\u01b0\u1ee3c tu\u1ed5i khai th\u00e1c r\u1eebng t\u1ed1i \u01b0u v\u1ec1 kinh t\u1ebf t\u00f9y theo m\u1ee5c \u0111\u00edch kinh doanh c\u1ee7a m\u00ecnh.<\/p>\n

T\u1eeb kh\u00f3a:<\/em><\/strong> keo lai, tr\u1ed3ng r\u1eebng g\u1ed7 l\u1edbn, th\u00e0nh th\u1ee5c kinh t\u1ebf, hi\u1ec7u qu\u1ea3 kinh t\u1ebf<\/td>\n<\/tr>\n

\n

<\/a>Determining the age of economic maturity of Acacia hybrid (Acacia mangium<\/em> \u00d7 A. auriculiformis<\/em>) by business purpose<\/strong><\/p>\n

The article has identified the age of economic maturity of Acacia hybrid for the purposes of trading various wood products. The results showed that: maturity age of Acacia hybrid with multi-product business purpose is age 12, maturity threshold can range from 11 – 12 years old; The age of economic maturity for the purpose of trading wooden furniture is 13 years, the threshold is 12 – 13 years old; 12 years of maturity for the purpose of trading lumber products, peeling, sticking boards is 12 years, maturity threshold is 11 – 12 years old; Mature age for the purpose of macadam is age 6, maturity threshold is 5 – 6 years old. Through this, people can choose the optimal age of economic exploitation based on their business purpose.<\/p>\n

Keywords:<\/em><\/strong> Acacia hybrid, large timber plantations, economic maturity, economic efficiency<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

<\/a>\u0110\u00c1NH GI\u00c1 KH\u1ea2 N\u0102NG S\u1eec D\u1ee4NG G\u1ed6 C\u00c2Y D\u1eba \u0110\u1ece\u00a0(Lithocarpus ducampii<\/em> A. Camus)<\/p>\n

<\/a>V\u00f5 \u0110\u1ea1i H\u1ea3i1<\/sup>, Nguy\u1ec5n T\u1eed Kim2<\/sup>, V\u0169 Th\u1ecb Ngoan2<\/sup>,
\nNguy\u1ec5n Th\u1ecb Tr\u1ecbnh2<\/sup>,Nguy\u1ec5n Tr\u1ecdng Ngh\u0129a2<\/sup><\/p>\n

\u00a0<\/strong>1<\/sup> Vi\u1ec7n Khoa h\u1ecdc L\u00e2m nghi\u1ec7p Vi\u1ec7t Nam
\n2<\/sup> Vi\u1ec7n Nghi\u00ean c\u1ee9u C\u00f4ng nghi\u1ec7p r\u1eebng<\/p>\n\n\n\n\n
T\u00d3M T\u1eaeT<\/p>\n

D\u1ebb \u0111\u1ecf (Lithocarpus ducampii<\/em> A. Camus) l\u00e0 c\u00e2y g\u1ed7 l\u1edbn, \u0111\u01b0\u01a1\u0300ng ki\u0301nh ngang ng\u01b0\u0323c 50 – 60 cm, cao t\u1edbi 30 m, th\u00e2n th\u1eb3ng, l\u00e0 lo\u00e0i c\u00e2y l\u00e1 r\u1ed9ng, th\u01b0\u1eddng xanh, b\u1ea3n \u0111\u1ecba c\u00f3 gi\u00e1 tr\u1ecb kinh t\u1ebf cao. G\u1ed7 c\u1ee9ng v\u00e0 m\u1ecbn trung b\u00ecnh, m\u1ea1ch g\u1ed7 \u0111\u01a1n \u0111\u1ed9c ph\u00e2n t\u00e1n, s\u1ed1 l\u01b0\u1ee3ng m\u1ea1ch \u00edt (3 – 5 m\u1ea1ch\/mm2<\/sup>), \u0111\u01b0\u1eddng k\u00ednh m\u1ea1ch c\u00f3 hai lo\u1ea1i kh\u00e1c nhau v\u1ec1 k\u00edch th\u01b0\u1edbc, lo\u1ea1i l\u1edbn (191 \u00b5m), lo\u1ea1i nh\u1ecf (83 \u00b5m); tia g\u1ed7 c\u00f3 hai \u0111\u1ed9 r\u1ed9ng kh\u00e1c nhau, lo\u1ea1i tia nh\u1ecf th\u01b0\u1eddng c\u00f3 1 d\u00e3y t\u1ebf b\u00e0o, cao trung b\u00ecnh 270 \u00b5m, tr\u00ean 1 mm theo h\u01b0\u1edbng ti\u1ebfp tuy\u1ebfn trung b\u00ecnh c\u00f3 19 tia. Lo\u1ea1i tia l\u1edbn (tia t\u1ee5 h\u1ee3p) th\u01b0\u1eddng r\u1ed9ng kho\u1ea3ng 20 d\u00e3y t\u1ebf b\u00e0o, tia r\u1ea5t cao, nh\u00ecn r\u00f5 b\u1eb1ng m\u1eaft th\u01b0\u1eddng, cao trung b\u00ecnh 9.813 \u00b5m, tr\u00ean 1 mm theo h\u01b0\u1edbng ti\u1ebfp tuy\u1ebfn trung b\u00ecnh c\u00f3 2 (1 – 3) tia l\u1edbn. M\u00f4 m\u1ec1m d\u1ecdc ph\u00e2n t\u00e1n v\u00e0 t\u1ee5 h\u1ee3p th\u00e0nh nh\u1eefng d\u1ea3i h\u1eb9p th\u01b0\u1eddng l\u01b0\u1ee3n s\u00f3ng theo chi\u1ec1u ti\u1ebfp tuy\u1ebfn, v\u00e2y quanh m\u1ea1ch kh\u00f4ng \u0111\u1ec1u. G\u1ed7 co r\u00fat trung b\u00ecnh (t\u1ed5ng \u0111\u1ed9 co r\u00fat tuy\u1ebfn t\u00ednh ph\u01b0\u01a1ng ti\u1ebfp tuy\u1ebfn 7,59%, xuy\u00ean t\u00e2m 5,73% v\u00e0 th\u1ec3 t\u00edch 14,04%). G\u1ed7 D\u1ebb \u0111\u1ecf c\u00f3 t\u00ednh ch\u1ea5t c\u01a1 h\u1ecdc trung b\u00ecnh \u0111\u1ebfn cao (\u0111\u1ed9 b\u1ec1n n\u00e9n d\u1ecdc th\u1edb 69,9 MPa, k\u00e9o d\u1ecdc th\u1edb 105,6 MPa, u\u1ed1n t\u0129nh 125,5 MPa, u\u1ed1n va \u0111\u1eadp 102,4 kJ\/m2<\/sup>, \u0111\u1ed9 b\u1ec1n t\u00e1ch d\u1ecdc th\u1edb 19,0 N\/mm, m\u00f4 \u0111un \u0111\u00e0n h\u1ed3i u\u1ed1n t\u0129nh 11,2 GPa). V\u1edbi nh\u1eefng \u0111\u1eb7c \u0111i\u1ec3m c\u1ea5u t\u1ea1o, t\u00ednh ch\u1ea5t v\u1eadt l\u00fd v\u00e0 c\u01a1 h\u1ecdc, g\u1ed7 D\u1ebb \u0111\u1ecf ph\u00f9 h\u1ee3p l\u00e0m v\u00e1n l\u1ea1ng, v\u00e1n gh\u00e9p thanh v\u00e0 \u0111\u1eb7c bi\u1ec7t s\u1ea3n xu\u1ea5t \u0111\u1ed3 g\u1ed7 n\u1ed9i th\u1ea5t. G\u1ed7 th\u00edch h\u1ee3p s\u1eed d\u1ee5ng l\u00e0m c\u00e1c c\u1ea5u ki\u1ec7n ch\u1ecbu l\u1ef1c trong x\u00e2y d\u1ef1ng v\u00e0 giao th\u00f4ng v\u1eadn t\u1ea3i.<\/p>\n

T\u1eeb kh\u00f3a:<\/em><\/strong> D\u1ebb \u0111\u1ecf, t\u00ednh ch\u1ea5t v\u1eadt l\u00fd, t\u00ednh ch\u1ea5t c\u01a1 h\u1ecdc, s\u1eed d\u1ee5ng g\u1ed7<\/td>\n<\/tr>\n

\n

<\/a>Assessment of the possibility in wood utilization of Lithocarpus ducampii<\/em> A. Camus<\/strong><\/p>\n

Lithocarpus ducampii<\/em> A. Camus is a large tree with normaly 50 – 60 cm in diameter and 30 m in height. It is a hardwood, evengreen, indigenous and commercial species in Vietnam. Wood is smooth and straight grain, wood diffuse-porous. Vessels are exclusively solitary, 5 – 8 vessels per square millimeter with two different size, mean tangential diameter of 191 \u00b5m and 83 \u00b5m in big and small ones respectively. Rays of two distinct sizes, rays exclusively uniseriate with 270 \u00b5m in height and normaly 19 rays per millimeter. Aggregate rays commonly ~ 20-seriate with 9,813 \u00b5m in height and observability by naked eyes, 1 – 3 aggregate rays per millimeter. Axial parenchyma scanty paratracheal or in narrow bands or lines up to three cells wide. Wood shrinkage is moderate (total shrinkage in tangential direstion 7.59%, in radial direction 5.73% and volume of 14.04%). Lithocarpus ducampii<\/em> wood is medium to high mechanical strength (compression parallel to grain: 69.6 MPa, tension parallel\u00a0to the\u00a0grain: 105.6 MPa, static bending: 125.5 MPa, impact strength: 102.4 kJ \/ m2<\/sup>, cleavage parallel to grain: 19.0 N \/ mm, modulus of elastic: 11.2 GPa). With structural features, physical and mechanical properties mention above, Lithocarpus ducampii<\/em> wood has the ability to be less warped, cracked during drying process, suitable for planed veneer, blockboards and wooden furniture. Wood is also suitable for use in construction and transportation needed a high load.<\/p>\n

Keywords:<\/em><\/strong> Lithocarpus ducampii<\/em>, wood physical properties, wood machenical properties, wood utilization<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

<\/a>K\u1ebeT QU\u1ea2 S\u1ea4Y S\u01a0 B\u1ed8 G\u1ed6 T\u1ebeCH (Tectona grandis<\/em>) B\u1eb0NG L\u00d2 S\u1ea4Y N\u0102NG L\u01af\u1ee2NG M\u1eb6T TR\u1edcI<\/p>\n

<\/a>B\u00f9i Duy Ng\u1ecdc, H\u00e0 Ti\u1ebfn M\u1ea1nh, L\u00ea Th\u1ecb H\u01b0ng<\/p>\n

Vi\u1ec7n Nghi\u00ean c\u1ee9u C\u00f4ng nghi\u1ec7p r\u1eebng<\/p>\n\n\n\n\n
T\u00d3M T\u1eaeT<\/p>\n

Th\u00f4ng s\u1ed1 c\u00f4ng ngh\u1ec7 s\u00e2\u0301y s\u01a1 b\u00f4\u0323 ph\u00f9 h\u1ee3p cho s\u00e2\u0301y g\u00f4\u0303 xe\u0309 g\u1ed7 T\u1ebfch (Tectona grandis<\/em>) r\u1eebng tr\u1ed3ng b\u1eb1ng l\u00f2 s\u1ea5y n\u0103ng l\u01b0\u1ee3ng m\u1eb7t tr\u1eddi \u0111\u00e3 \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh sau khi th\u00ed nghi\u1ec7m c\u00e1c ch\u1ebf \u0111\u1ed9 s\u1ea5y \u1edf c\u00e1c d\u1ed1c s\u1ea5y kh\u00e1c nhau (U = 3,2; U = 3,6; U = 4,0). K\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u cho th\u1ea5y g\u1ed7 xe\u0309 g\u00f4\u0303 T\u1ebfch s\u1ea5y s\u01a1 b\u1ed9 b\u1eb1ng n\u0103ng l\u01b0\u1ee3ng m\u1eb7t tr\u1eddi c\u00f3 m\u1ee9c \u0111\u1ed9 n\u1ee9t v\u1ee1 t\u0103ng r\u00f5 r\u1ec7t khi t\u0103ng d\u1ed1c s\u1ea5y. M\u1ee9c \u0111\u1ed9 n\u1ee9t v\u1ee1 t\u1eeb 0,53% \u1edf ch\u1ebf \u0111\u1ed9 s\u1ea5y U = 3,2 t\u0103ng l\u00ean g\u00e2\u0301p h\u01a1n 3 l\u1ea7n \u1edf ch\u1ebf \u0111\u1ed9 s\u1ea5y U = 4,0. M\u1ee9c \u0111\u1ed9 cong v\u00eanh h\u1ea7u nh\u01b0 kh\u00f4ng xu\u1ea5t hi\u1ec7n, \u1edf c\u1ea3 3 ch\u1ebf \u0111\u1ed9 s\u1ea5y \u0111\u1ec1u ch\u1ec9 l\u00e0 0,02%. T\u1ef7 l\u1ec7 co r\u00fat ch\u00eanh l\u1ec7ch kh\u00f4ng l\u1edbn gi\u1eefa c\u00e1c ch\u1ebf \u0111\u1ed9 s\u1ea5y nh\u01b0ng c\u00f3 gi\u00e1 tr\u1ecb t\u01b0\u01a1ng \u0111\u1ed1i cao (t\u1ef7 l\u1ec7 co r\u00fat chi\u1ec1u d\u00e0y 3,316%, t\u1ef7 l\u1ec7 co r\u00fat chi\u1ec1u r\u1ed9ng 4,328%). \u0110\u1ed1i chi\u1ebfu ti\u00eau chu\u1ea9n AS\/NZ 4787:2000, ph\u00e2n c\u1ea5p g\u1ed7 s\u1ea5y theo n\u1ee9t v\u1ee1, g\u1ed7 ch\u1ec9 \u0111\u1ea1t lo\u1ea1i A \u1edf d\u1ed1c s\u1ea5y U = 3,2, c\u00f2n l\u1ea1i \u0111\u1ea1t loa\u0323i C v\u00e0 loa\u0323i D \u1edf d\u1ed1c s\u1ea5y U = 3,6 v\u00e0 U = 4,0. Th\u1eddi gian s\u1ea5y g\u1ed7 T\u1ebfch t\u1eeb \u0111\u1ed9 \u1ea9m 50% v\u1ec1 30% r\u1ea5t nhanh, c\u00f3 s\u1ef1 kh\u00e1c nhau \u1edf ba ch\u1ebf \u0111\u1ed9 s\u1ea5y nh\u01b0ng d\u00e0i nh\u1ea5t ch\u1ec9 l\u00e0 12,38 ng\u00e0y \u1edf d\u1ed1c s\u1ea5y U = 3,2. \u1ede d\u1ed1c s\u1ea5y l\u1edbn nh\u1ea5t U = 4,0, th\u01a1\u0300i gian s\u00e2\u0301y ch\u1ec9 g\u1ea7n 6 ng\u00e0y. D\u1ed1c s\u1ea5y U = 3,2 cho ch\u1ea5t lu\u1ee3ng g\u1ed7 s\u1ea5y cao v\u00e0 th\u1eddi gian s\u1ea5y h\u1ee3p l\u00fd n\u00ean \u0111\u01b0\u1ee3c l\u1ef1a ch\u1ecdn l\u00e0m ch\u1ebf \u0111\u1ed9 s\u1ea5y s\u01a1 b\u1ed9 b\u1eb1ng n\u0103ng l\u01b0\u1ee3ng m\u1eb7t tr\u1eddi cho g\u1ed7 T\u1ebfch.<\/p>\n

T\u1eeb kh\u00f3a:<\/em><\/strong> L\u00f2 s\u1ea5y n\u0103ng l\u01b0\u1ee3ng m\u1eb7t tr\u1eddi, ch\u1ebf \u0111\u1ed9 s\u1ea5y s\u01a1 b\u1ed9, g\u1ed7 T\u1ebfch<\/td>\n<\/tr>\n

\n

<\/a>A study on pre-drying technology for Tectona grandis<\/em> sawn timber in solar kiln<\/strong><\/p>\n

The suitable pre-drying technological parameters for Tectona grandis<\/em> plantation sawn timber in solar kiln were investigated after experimenting on the different drying gradients (U = 3.2; U = 3.6; U = 4.0). The results showed that the percentage of wood checks and splits increased significantly when the drying gradient increased. This value was 0.53% at the softest drying schedule (U = 3.2), increased 3.3 times at the drying schedule U = 4.0. The degree of warping was only 0.02% at all the drying gradients. The shrinkage ratio was relatively high and had an insignificant difference between the drying schedules (3.316% in thickness and 4.328% in width on average). According to the cracking classification for dried wood in Australian Standard AS\/NZ 4787:2000, dried timber was grade A at U = 3.2, the rest were grades C and D at U = 3.6 and U = 4.0, respectively. Drying time from 50% to 30% MC was very fast and different in three drying schedules, but the slowest drying time was only 12.38 days at U = 3.2. At the biggest drying gradient (U = 4.0), this lasted for nearly 6 days. At U = 3.2, drying quality of timbers was high and drying time was suitable, and thus these parameters were selected as the pre-drying schedule for Tectona grandis<\/em> sawn timber in solar kiln.<\/p>\n

Keywords:<\/em><\/strong> Solar drying kiln, pre-drying schedule, Tectona grandis<\/em><\/p>\n

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

 <\/p>\n","protected":false},"excerpt":{"rendered":"

T\u1ea0P CH\u00cd KHOA H\u1eccC L\u00c2M NGHI\u1ec6P S\u1ed0 3 – 2019 1. C\u1ea5u tr\u00fac, ch\u1ea5t l\u01b0\u1ee3ng v\u00e0 \u0111a d\u1ea1ng sinh h\u1ecdc c\u00e1c th\u1ea3m th\u1ef1c v\u1eadt t\u1ea1i V\u01b0\u1eddn Qu\u1ed1c gia Ba V\u00ec, H\u00e0 N\u1ed9i Structure, quality and biodiversity of forest types in Ba Vi National Park, Ha Noi Tr\u1ea7n Minh Phong B\u00f9i M\u1ea1nh H\u01b0ng 3 2. Nghi\u00ean […]<\/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\/1735"}],"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=1735"}],"version-history":[{"count":3,"href":"https:\/\/vafs.gov.vn\/en\/wp-json\/wp\/v2\/posts\/1735\/revisions"}],"predecessor-version":[{"id":2403,"href":"https:\/\/vafs.gov.vn\/en\/wp-json\/wp\/v2\/posts\/1735\/revisions\/2403"}],"wp:attachment":[{"href":"https:\/\/vafs.gov.vn\/en\/wp-json\/wp\/v2\/media?parent=1735"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vafs.gov.vn\/en\/wp-json\/wp\/v2\/categories?post=1735"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vafs.gov.vn\/en\/wp-json\/wp\/v2\/tags?post=1735"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}