{"id":1499,"date":"2016-05-19T11:22:48","date_gmt":"2016-05-19T04:22:48","guid":{"rendered":"http:\/\/vafs.gov.vn\/en\/?p=1499"},"modified":"2023-11-23T12:25:57","modified_gmt":"2023-11-23T05:25:57","slug":"vietnam-journal-of-forest-science-number-1-2016","status":"publish","type":"post","link":"https:\/\/vafs.gov.vn\/en\/2016\/05\/vietnam-journal-of-forest-science-number-1-2016\/","title":{"rendered":"Vietnam Journal of Forest Science Number 1-2016"},"content":{"rendered":"

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

T\u1ea0P CH\u00cd KHOA H\u1eccC L\u00c2M NGHI\u1ec6P S\u1ed0 1 – 2016<\/b><\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
1<\/td>\nNghi\u00ean c\u1ee9u t\u00e1i sinh t\u1ef1 nhi\u00ean c\u1ee7a c\u00e2y \u0110inh \u0111\u0169a (Stereospermum colais <\/i>(Dillw) Mabberl) d\u01b0\u1edbi t\u00e1n r\u1eebng t\u1ef1 nhi\u00ean v\u00e0 r\u1eebng tr\u1ed3ng<\/td>\nHo\u00e0ng V\u0169 Th\u01a1<\/td>\nEvaluating reality of natural regeneration of Stereospermum colais <\/i>under the natural forest canopy and plantation<\/td>\n4161<\/td>\n<\/tr>\n
2<\/td>\nM\u1ed1i quan h\u1ec7 c\u1ee7a Xoan nh\u1eeb (Choerospondias axillaris<\/i>) v\u1edbi c\u00e1c lo\u00e0i trong r\u1eebng t\u1ef1 nhi\u00ean \u1edf 2 t\u1ec9nh S\u01a1n La v\u00e0 L\u00e0o Cai<\/td>\nL\u1ea1i Thanh H\u1ea3i, Phan Th\u1ecb Luy\u1ebfn<\/td>\nRelationship between Choerospndias axillaris <\/i>and other species in Son La and Lao Cai<\/td>\n4172<\/td>\n<\/tr>\n
3<\/td>\nNghi\u00ean c\u1ee9u \u0111\u1eb7c \u0111i\u1ec3m c\u1ea5u tr\u00fac v\u00e0 m\u1ed1i quan h\u1ec7 lo\u00e0i c\u1ee7a D\u1ebb gai ph\u00fa th\u1ecd (Castanopsis phuthoensis <\/i>Luong) trong r\u1eebng th\u1ee9 sinh ph\u1ee5c h\u1ed3i \u1edf C\u1ea7u Hai, Ph\u00fa Th\u1ecd<\/td>\nNguy\u1ec5n V\u0103n Th\u1ecd, Nguy\u1ec5n Vi\u1ec5n, Ph\u1ea1m Quang Ti\u1ebfn, Nguy\u1ec5n Th\u1ecb \u00c1nh Nguy\u1ec7t<\/td>\nResearch on forest structure and relations between tree species of Castanopsis phuthoensis <\/i>in forest rehabilitation in Cau Hai, Phu Tho<\/td>\n4180<\/td>\n<\/tr>\n
4<\/td>\nSinh tr\u01b0\u1edfng c\u1ee7a m\u1ed9t s\u1ed1 lo\u00e0i c\u00e2y b\u1ea3n \u0111\u1ecba trong r\u1eebng tr\u1ed3ng h\u1ed7n lo\u00e0i cung c\u1ea5p g\u1ed7 l\u1edbn \u1edf C\u1ea7u Hai, Ph\u00fa Th\u1ecd<\/td>\nHo\u00e0ng V\u0103n Th\u1eafng, Nguy\u1ec5n Th\u1ecb Thi\u00eam, \u0110o\u00e0n Th\u1ecb Th\u1ea3o,<\/td>\nGrowth of some native tree species in mixed plantation for timber in Cau Hai, Phu Tho province<\/td>\n4190<\/td>\n<\/tr>\n
5<\/td>\nTri\u1ec3n v\u1ecdng g\u1ed7 l\u1edbn c\u1ee7a m\u1ed9t s\u1ed1 m\u00f4 h\u00ecnh tr\u1ed3ng c\u00e1c lo\u00e0i keo \u1edf B\u00ecnh \u0110\u1ecbnh v\u00e0 Ph\u00fa Y\u00ean<\/td>\nNguy\u1ec5n Huy S\u01a1n, Ph\u1ea1m \u0110\u00ecnh S\u00e2m<\/td>\nThe potential sawlog production of acacia plantations in Binh Dinh and Phu Yen<\/td>\n4199<\/td>\n<\/tr>\n
6<\/td>\n\u1ee8ng d\u1ee5ng vi\u1ec5n th\u00e1m landsat \u0111a th\u1eddi gian v\u00e0 GIS \u0111\u00e1nh gi\u00e1 bi\u1ebfn \u0111\u1ed9ng di\u1ec7n t\u00edch r\u1eebng ng\u1eadp m\u1eb7n ven bi\u1ec3n huy\u1ec7n Ti\u00ean Y\u00ean, t\u1ec9nh Qu\u1ea3ng Ninh giai \u0111o\u1ea1n 1994 – 2015<\/td>\nNguy\u1ec5n H\u1ea3i H\u00f2a<\/td>\nApplication of multispectral landsat data and GIS to monitor changes in coastal mangroves in Tien Yen district, Quang Ninh province during 1994 – 2015<\/td>\n4208<\/td>\n<\/tr>\n
7<\/td>\nT\u1ea1o n\u1ed9i sinh nh\u00e2n t\u1ea1o n\u1ea5m B\u1ea1ch c\u01b0\u01a1ng (Beauveria bassiana<\/i>) cho B\u1ea1ch \u0111\u00e0n camal \u0111\u1ec3 ph\u00f2ng tr\u1eeb ong \u0111en (Leptocybe invasa<\/i>) g\u00e2y u b\u01b0\u1edbu<\/td>\nL\u00ea V\u0103n B\u00ecnh, \u0110\u1eb7ng Nh\u01b0 Qu\u1ef3nh, Ph\u1ea1m Quang Thu<\/td>\nEstablishing the entomopathogenic fungus Beauveria bassiana <\/i>as an artificial endophyte in Eucalyptus camaldulensis <\/i>for the control of the gall wasp Leptocybe invasa <\/i><\/td>\n4218<\/td>\n<\/tr>\n
8<\/td>\nNghi\u00ean c\u1ee9u m\u1eadt \u0111\u1ed9 b\u00e0o t\u1eed n\u1ea5m Ceratocystis manginecans <\/i>ph\u00e1t t\u00e1n trong r\u1eebng Keo l\u00e1 tr\u00e0m, keo lai v\u00e0 Keo tai t\u01b0\u1ee3ng t\u1ea1i Vi\u1ec7t Nam<\/td>\nNguy\u1ec5n Minh Ch\u00ed, Ph\u1ea1m Quang Thu<\/td>\nSpore trap study in Acacia auriculiformis<\/i>, acacia hybrids and Acacia mangium <\/i>plantations in Vietnam<\/td>\n4225<\/td>\n<\/tr>\n
9<\/td>\n\u0110\u1eb7c \u0111i\u1ec3m sinh h\u1ecdc c\u1ee7a n\u1ea5m Th\u01b0\u1ee3ng ho\u00e0ng (Phellinus linteus) trong nu\u00f4i c\u1ea5y thu\u1ea7n khi\u1ebft<\/td>\nPh\u1ea1m Quang Thu<\/td>\nStudies on the biological characteristics of Phellinus linteus in pure culture<\/td>\n4231<\/td>\n<\/tr>\n
10<\/td>\nThi\u00ean \u0111\u1ecbch c\u1ee7a ong \u0111en (Leptocybe invasa Fisher & la Salle) g\u00e2y u b\u01b0\u1edbu b\u1ea1ch \u0111\u00e0n t\u1ea1i Vi\u1ec7t Nam<\/td>\nL\u00ea V\u0103n B\u00ecnh, Ph\u1ea1m Quang Thu<\/td>\nDetecting natural enemies of Letocybe invasa Fisher & la Salle species gall wasp in Vietnam<\/td>\n4238<\/td>\n<\/tr>\n
11<\/td>\nS\u00e2u \u0111o (Biston suppressaria Guen\u00e9e) – m\u1ed1i \u0111e d\u1ecda m\u1edbi cho r\u1eebng tr\u1ed3ng Keo tai t\u01b0\u1ee3ng (Acacia mangium) t\u1ea1i Vi\u1ec7t Nam<\/td>\nL\u00ea V\u0103n B\u00ecnh, Ph\u1ea1m Quang Thu<\/td>\nLooper caterpillar Biston suppressaria Guen\u00e9e – a new emerging threat to Acacia mangium plantations in Vietnam<\/td>\n4245<\/td>\n<\/tr>\n
12<\/td>\n\u0110i\u1ec1u tra th\u00e0nh ph\u1ea7n lo\u00e0i n\u1ea5m g\u00e2y b\u1ec7nh th\u1ed1i r\u1ec5 thu\u1ed9c h\u1ecd Pythiaceae g\u00e2y h\u1ea1i Keo tai t\u01b0\u1ee3ng v\u00e0 keo lai \u1edf c\u00e1c t\u1ec9nh mi\u1ec1n B\u1eafc Vi\u1ec7t Nam<\/td>\nPh\u1ea1m Quang Thu<\/td>\nSurveys of pythiaceae causing root rot diseases of Acacia mangium and Acacia hybrid in some provinces of North Vietnam<\/td>\n4251<\/td>\n<\/tr>\n
13<\/td>\nK\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u th\u00e0nh ph\u1ea7n s\u00e2u, b\u1ec7nh h\u1ea1i m\u1ed9t s\u1ed1 lo\u00e0i c\u00e2y tr\u1ed3ng r\u1eebng ch\u00ednh t\u1ea1i Vi\u1ec7t Nam<\/td>\nPh\u1ea1m Quang Thu<\/td>\nResults of a survey of insect pests and diseases of the main forest plantation species in Vietnam<\/td>\n4257<\/td>\n<\/tr>\n
14<\/td>\nT\u00ednh \u0111a d\u1ea1ng v\u00e0 gi\u00e1 tr\u1ecb b\u1ea3o t\u1ed3n khu h\u1ec7 th\u00fa (Mammalia fauna) t\u1ea1i V\u01b0\u1eddn Qu\u1ed1c gia Ba B\u1ec3, t\u1ec9nh B\u1eafc K\u1ea1n<\/td>\n\u0110\u1ed3ng Thanh H\u1ea3i<\/td>\nDiversity and conservation values of Mammalia fauna in Ba Be National Park, Bac Kan province<\/td>\n4265<\/td>\n<\/tr>\n
15<\/td>\nC\u00e1c ch\u1ea5t chi\u1ebft xu\u1ea5t t\u1eeb l\u00e1 c\u00e2y keo lai (Acacia hybrids)<\/td>\nNguy\u1ec5n Th\u1ecb Minh Nguy\u1ec7t<\/td>\nThe extractives from leaves of Acacia hybrid<\/td>\n4276<\/td>\n<\/tr>\n
16<\/td>\n\u1ea2nh h\u01b0\u1edfng c\u1ee7a x\u1eed l\u00fd nhi\u1ec7t \u0111\u1ebfn m\u1ed9t s\u1ed1 t\u00ednh ch\u1ea5t c\u01a1 h\u1ecdc g\u1ed7 keo lai<\/td>\nNguy\u1ec5n Th\u1ecb Minh Nguy\u1ec7t V\u0169 M\u1ea1nh T\u01b0\u1eddng<\/td>\nEffect of thermal treatment on some mechanical properties of Acacia hybrid wood<\/td>\n4285<\/td>\n<\/tr>\n
17<\/td>\nCh\u1ebf \u0111\u1ed9 c\u1eaft h\u1ee3p l\u00fd v\u1eadt li\u1ec7u MDF tr\u00ean m\u00e1y c\u01b0a P – 2800 TM<\/td>\nHo\u00e0ng Vi\u1ec7t<\/td>\nReasonable parameters of cutting of MDF material on sawing machine P – 2800 TM<\/td>\n4292<\/td>\n<\/tr>\n
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NGHI\u00caN C\u1ee8U T\u00c1I SINH T\u1ef0 NHI\u00caN C\u1ee6A C\u00c2Y \u0110INH \u0110\u0168A (Stereospermum colais <\/i>(Dillw) Mabberl) D\u01af\u1edaI T\u00c1N R\u1eeaNG T\u1ef0 NHI\u00caN V\u00c0 R\u1eeaNG TR\u1ed2NG<\/b><\/p>\n

Ho\u00e0ng V\u0169 Th\u01a1<\/b><\/p>\n

Tr\u01b0\u1eddng \u0110\u1ea1i h\u1ecdc L\u00e2m nghi\u1ec7p<\/i><\/p>\n\n\n\n\n
\u00a0<\/b><\/p>\n

T\u00d3M T\u1eaeT <\/b>K\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u th\u1ef1c tr\u1ea1ng t\u00e1i sinh t\u1ef1 nhi\u00ean trong \u0111i\u1ec1u ki\u1ec7n t\u1ef1 nhi\u00ean v\u00e0 g\u00e2y tr\u1ed3ng t\u1ea1i L\u00e0o Cai, Y\u00ean B\u00e1i, H\u00f2a B\u00ecnh v\u00e0 Xu\u00e2n Mai (H\u00e0 N\u1ed9i) cho th\u1ea5y, \u0110inh \u0111\u0169a l\u00e0 lo\u00e0i c\u00e2y b\u1ea3n \u0111\u1ecba c\u00f3 kh\u1ea3 n\u0103ng t\u00e1i sinh h\u1ea1t v\u00e0 c\u1ea3 t\u00e1i sinh ch\u1ed3i kh\u00e1 m\u1ea1nh. Trong \u0111i\u1ec1u ki\u1ec7n g\u00e2y tr\u1ed3ng kh\u1ea3 n\u0103ng t\u00e1i sinh t\u1ef1 nhi\u00ean c\u1ee7a lo\u00e0i \u0110inh \u0111\u0169a di\u1ec5n ra m\u1ea1nh m\u1ebd, trong khi \u1edf r\u1eebng t\u1ef1 nhi\u00ean ch\u01b0a ph\u00e1t hi\u1ec7n th\u1ea5y t\u00e1i sinh t\u1ef1 nhi\u00ean xu\u1ea5t hi\u1ec7n, v\u00e0 t\u00e1i sinh t\u1ef1 nhi\u00ean xu\u1ea5t hi\u1ec7n h\u1ea1n ch\u1ebf \u1edf khu c\u00e2y tr\u1ed3ng ph\u00e2n t\u00e1n. Trong \u0111i\u1ec1u ki\u1ec7n \u0111\u1ea5t \u1ea9m m\u00e1t d\u01b0\u1edbi g\u1ed1c c\u00e2y m\u1eb9 sai qu\u1ea3 \u1ed5n \u0111\u1ecbnh, s\u1ed1 l\u01b0\u1ee3ng c\u00e2y t\u00e1i sinh nhi\u1ec1u, ch\u1ea5t l\u01b0\u1ee3ng c\u00e2y t\u00e1i sinh t\u1ed1t h\u01a1n so v\u1edbi \u0111i\u1ec1u ki\u1ec7n d\u01b0\u1edbi g\u1ed1c c\u00e2y m\u1eb9 l\u1edbp \u0111\u1ea5t m\u1eb7t kh\u00f4 c\u1eb1n, l\u1eabn nhi\u1ec1u s\u1ecfi \u0111\u00e1. Trong \u0111i\u1ec1u ki\u1ec7n g\u00e2y tr\u1ed3ng, kh\u1ea3 n\u0103ng t\u00e1i sinh t\u1ef1 nhi\u00ean di\u1ec5n ra kh\u00e1 m\u1ea1nh m\u1ebd d\u01b0\u1edbi g\u1ed1c c\u00e1c c\u00e2y \u0110inh \u0111\u0169a sai qu\u1ea3, c\u00f3 tu\u1ed5i tr\u00ean 15 n\u0103m. Th\u00e0nh c\u00f4ng c\u1ee7a nghi\u00ean c\u1ee9u n\u00e0y g\u00f3p ph\u1ea7n quan tr\u1ecdng cung c\u1ea5p th\u00f4ng tin, c\u01a1 s\u1edf x\u00fac ti\u1ebfn t\u00e1i sinh t\u1ef1 nhi\u00ean cho lo\u00e0i \u0110inh \u0111\u0169a trong \u0111i\u1ec1u ki\u1ec7n t\u1ef1 nhi\u00ean v\u00e0 g\u00e2y tr\u1ed3ng, g\u00f3p ph\u1ea7n quan tr\u1ecdng cho ch\u1ecdn gi\u1ed1ng, b\u1ea3o t\u1ed3n v\u00e0 ph\u00e1t tri\u1ec3n t\u1ea1i c\u00e1c \u0111\u1ecba \u0111i\u1ec3m nghi\u00ean c\u1ee9u v\u00e0 c\u00e1c n\u01a1i kh\u00e1c c\u00f3 \u0111i\u1ec1u ki\u1ec7n t\u01b0\u01a1ng t\u1ef1.<\/p>\n

T\u1eeb kh\u00f3a: <\/i><\/b>C\u00e2y b\u1ea3n \u0111\u1ecba, t\u00e1i sinh t\u1ef1 nhi\u00ean, \u0110inh \u0111\u0169a, \u0111\u1eb7c \u0111i\u1ec3m sinh tr\u01b0\u1edfng<\/p>\n

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Evaluating reality of natural regeneration of Stereospermum colais <\/i>under the natural forest canopy and plantation <\/b><\/p>\n

The research results of the evaluate reality of natural regeneration of Yellow snake trees under the netural forest canopy and plantation in Lao Cai, Yen Bai, Hoa Binh and Xuan Mai (Hanoi) shows, it is based indigenous species capable of regeneration seeds and buds sharply regeneration. In terms of planted natural regeneration capacity of Yellow snake tree to bring strong, while in terms of natural forest regeneration undiscovered natural trees and plants scattered natural regeneration capacity appears limited. In the moist soil conditions under a mother tree fruitings stablity many years, the number of trees regeneration more and better quality than the arid soil or gravel. In terms of plantation, natural regeneration going strong at the base of mother tree fruiting stability, aged over 15 years. The success of this study provide an important contribution to information, promotion of natural regeneration in natural conditions and plantation, contribution to the breeding, conservation and development Yellow snake tree in the study sites and elsewhere have similar conditions.<\/p>\n

Keywords: <\/i><\/b>Native plants, natural regeneration, Stereospermum colais<\/i>, growth characteristics<\/p>\n

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M\u1ed0I QUAN H\u1ec6 C\u1ee6A XOAN NH\u1eea (Choerospondias axillaris) <\/i>V\u1edaI C\u00c1C LO\u00c0I TRONG R\u1eeaNG T\u1ef0 NHI\u00caN \u1ede 2 T\u1ec8NH S\u01a0N LA V\u00c0 L\u00c0O CAI <\/b><\/p>\n

L\u1ea1i Thanh H\u1ea3i<\/b>1<\/b>, Phan Th\u1ecb Luy\u1ebfn<\/b>2 <\/b><\/p>\n

1 <\/i>Vi\u1ec7n Nghi\u00ean c\u1ee9u L\u00e2m sinh <\/i>2 <\/i>Trung t\u00e2m Nghi\u00ean c\u1ee9u v\u00e0 Chuy\u1ec3n giao k\u1ef9 thu\u1eadt l\u00e2m sinh<\/i><\/p>\n\n\n\n\n
T\u00d3M T\u1eaeT <\/b>Nghi\u00ean c\u1ee9u m\u1ed1i quan h\u1ec7 gi\u1eefa Xoan nh\u1eeb v\u1edbi c\u00e1c lo\u00e0i c\u00e2y trong r\u1eebng t\u1ef1 nhi\u00ean \u0111\u00e3 s\u1eed d\u1ee5ng ph\u01b0\u01a1ng ph\u00e1p \u0111i\u1ec1u tra \u00f4 6 c\u00e2y v\u00e0 c\u0103n c\u1ee9 v\u00e0o ch\u1ec9 s\u1ed1 t\u1ea7n su\u1ea5t xu\u1ea5t hi\u1ec7n \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh m\u1ed1i quan h\u1ec7. K\u1ebft qu\u1ea3 nh\u01b0 sau: Xoan nh\u1eeb th\u01b0\u1eddng ph\u00e2n b\u1ed1 \u1edf tr\u1ea1ng th\u00e1i r\u1eebng h\u1ed7n lo\u00e0i l\u00e1 r\u1ed9ng th\u01b0\u1eddng xanh ph\u1ee5c h\u1ed3i sau khai th\u00e1c nhi\u1ec1u n\u0103m; N\u1eb1m \u1edf t\u1ea7ng tr\u00ean c\u1ee7a t\u00e1n r\u1eebng v\u1edbi D1.3, Hvn l\u1edbn h\u01a1n c\u00e1c lo\u00e0i c\u00e2y b\u1ea1n; S\u1ed1 lo\u00e0i c\u00e2y xu\u1ea5t hi\u1ec7n c\u00f9ng Xoan nh\u1eeb t\u01b0\u01a1ng \u0111\u1ed1i cao t\u1ea1i hai khu v\u1ef1c nghi\u00ean c\u1ee9u (L\u00e0o Cai: V\u0103n B\u00e0n 49 lo\u00e0i, Sa Pa 50 lo\u00e0i; S\u01a1n La: M\u1ed9c ch\u00e2u 26 lo\u00e0i, Ph\u00f9 Y\u00ean 20 lo\u00e0i, Thu\u1eadn Ch\u00e2u 24 lo\u00e0i); T\u1ea1i L\u00e0o Cai lo\u00e0i r\u1ea5t hay g\u1eb7p v\u1edbi Xoan nh\u1eeb l\u00e0 Tr\u00e1m tr\u1eafng; T\u1ea1i S\u01a1n La lo\u00e0i r\u1ea5t hay g\u1eb7p v\u1edbi Xoan nh\u1eeb l\u00e0 B\u1ed3 \u0111\u1ec1, S\u1ed3i ph\u1ea3ng, M\u1eafc ni\u1ec5ng v\u00e0 Xoan nh\u1eeb.<\/p>\n

T\u1eeb kh\u00f3a: <\/i><\/b>M\u1ed1i quan h\u1ec7, Xoan nh\u1eeb<\/p>\n

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Relationship between Choerospndias axillaris <\/i>and other species in Son La and Lao Cai<\/b><\/p>\n

\u00a0<\/b>Research on relationship between Choerospondias axillaris <\/i>and other species in natural forests, used survey methods of \u201c6 tree plot\u201d and appearing frequency index. The results showed that: Choerospondias axillaris <\/i>distribution in evergreen broadleaf forest, spartly; on the upper storey of the forest canopy, DBH and Ht are higher than that of neighbour species; In Van Ban, there were 49 species living with Choerospondias axillaris<\/i>; In Sa Pa, there were 50 species living with Choerospondias axillaris<\/i>; In Moc Chau, there were 26 species living with Choerospondias axillaris<\/i>; In Phu Yen, there were 20 species living with Choerospondias axillaris<\/i>; In Thuan Chau, there were 24 species living with Choerospondias axillaris<\/i>; In Lao Cai, the number of species appearing with A. triphysa <\/i>with very high frequence were Canarium album<\/i>; In Son La, The number of species appearing with A. triphysa <\/i>with very high frequence were Ficus religiosa, Lithocarpus fissus, Eberhardtia aurata, Choerospondias axillaris. <\/i><\/p>\n

Keywords: <\/i><\/b>Relation, Choerospondias axillaris<\/p>\n

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NGHI\u00caN C\u1ee8U \u0110\u1eb6C \u0110I\u1ec2M C\u1ea4U TR\u00daC V\u00c0 M\u1ed0I QUAN H\u1ec6 LO\u00c0I C\u1ee6A D\u1eba GAI PH\u00da TH\u1ecc (Castanopsis phuthoensis <\/i>Luong) TRONG R\u1eeaNG TH\u1ee8 SINH PH\u1ee4C H\u1ed2I \u1ede C\u1ea6U HAI, PH\u00da TH\u1ecc <\/b><\/p>\n

Nguy\u1ec5n V\u0103n Th\u1ecd, Nguy\u1ec5n Vi\u1ec5n, Ph\u1ea1m Quang Ti\u1ebfn, Nguy\u1ec5n Th\u1ecb \u00c1nh Nguy\u1ec7t <\/b><\/p>\n

Trung t\u00e2m Khoa h\u1ecdc L\u00e2m nghi\u1ec7p v\u00f9ng Trung t\u00e2m B\u1eafc B\u1ed9<\/i><\/p>\n\n\n\n\n
T\u00d3M T\u1eaeT <\/b>D\u1ebb gai ph\u00fa th\u1ecd l\u00e0 lo\u00e0i c\u00e2y b\u1ea3n \u0111\u1ecba \u0111\u1eb7c h\u1eefu c\u1ee7a t\u1ec9nh Ph\u00fa Th\u1ecd, c\u00f3 ph\u00e2n b\u1ed1 h\u1eb9p t\u1ea1i 2 x\u00e3 thu\u1ed9c huy\u1ec7n \u0110oan H\u00f9ng, kh\u1ea3 n\u0103ng t\u00e1i sinh k\u00e9m n\u00ean c\u1ea7n c\u00f3 nghi\u00ean c\u1ee9u v\u1ec1 c\u1ea5u tr\u00fac v\u00e0 m\u1ed1i quan h\u1ec7 lo\u00e0i c\u1ee7a n\u00f3 v\u1edbi c\u00e1c lo\u00e0i c\u00e2y b\u1ea1n \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh h\u01b0\u1edbng b\u1ea3o t\u1ed3n ngu\u1ed3n gen qu\u00fd c\u1ee7a lo\u00e0i c\u00e2y n\u00e0y. K\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u c\u1ea5u tr\u00fac r\u1eebng cho th\u1ea5y D\u1ebb gai ph\u00fa th\u1ecd l\u00e0 lo\u00e0i c\u00e2y chi\u1ebfm \u01b0u th\u1ebf trong r\u1eebng th\u1ee9 sinh ph\u1ee5c h\u1ed3i, c\u00f3 ch\u1ec9 s\u1ed1 IV tr\u00ean 5% \u1edf r\u1eebng khoanh nu\u00f4i v\u00e0 l\u00e0m gi\u00e0u r\u1eebng l\u1ed7 tr\u1ed1ng, \u0111\u1eb7c bi\u1ec7t r\u1eebng khoanh nu\u00f4i m\u1eadt \u0111\u1ed9 trung b\u00ecnh v\u00e0 cao ch\u1ec9 s\u1ed1 IV \u0111\u1ea1t x\u1ea5p x\u1ec9 10%, l\u00e0m gi\u00e0u r\u1eebng l\u1ed7 tr\u1ed1ng c\u00f3 IV \u0111\u1ea1t 17,9% nh\u01b0ng m\u1eadt \u0111\u1ed9 c\u1ee7a D\u1ebb gai ph\u00fa th\u1ecd \u1edf c\u00e1c tr\u1ea1ng th\u00e1i r\u1eebng ph\u1ee5c h\u1ed3i r\u1ea5t th\u1ea5p, trung b\u00ecnh ch\u1ec9 c\u00f3 3,3 – 11,1 c\u00e2y\/ha. Ph\u00e2n b\u1ed1 s\u1ed1 c\u00e2y theo c\u1ea5p \u0111\u01b0\u1eddng k\u00ednh c\u1ee7a D\u1ebb gai ph\u00fa th\u1ecd \u1edf c\u00e1c tr\u1ea1ng th\u00e1i r\u1eebng c\u00f3 d\u1ea1ng \u0111\u01b0\u1eddng cong m\u1ed9t \u0111\u1ec9nh \u1edf c\u1ee1 k\u00ednh 20cm ho\u1eb7c 24cm. Ph\u00e2n b\u1ed1 s\u1ed1 c\u00e2y theo c\u1ea5p chi\u1ec1u cao c\u1ee7a lo\u00e0i n\u00e0y c\u0169ng c\u00f3 d\u1ea1ng \u0111\u01b0\u1eddng cong m\u1ed9t \u0111\u1ec9nh \u1edf c\u1ea5p chi\u1ec1u cao 18m ho\u1eb7c 20m. Gi\u00e1 tr\u1ecb c\u1ee7a c\u00e1c \u0111\u1ec9nh n\u00e0y cao h\u01a1n \u0111\u01b0\u1eddng k\u00ednh, chi\u1ec1u cao trung b\u00ecnh c\u1ee7a c\u00e1c tr\u1ea1ng th\u00e1i r\u1eebng ph\u1ee5c h\u1ed3i nghi\u00ean c\u1ee9u. D\u1ebb gai ph\u00fa th\u1ecd xu\u1ea5t hi\u1ec7n v\u1edbi ch\u00ednh n\u00f3 v\u00e0 31 lo\u00e0i c\u00e2y b\u1ea1n kh\u00e1c, c\u00f3 t\u00ednh qu\u1ea7n th\u1ec3 r\u00f5 r\u1ec7t, th\u01b0\u1eddng g\u1eb7p v\u1edbi R\u00e0ng r\u00e0ng m\u00edt, Lim xanh, S\u1ed3i ph\u1ea3ng, D\u1ebb cau, B\u1ee9a v\u00e0 Ng\u00e1t.<\/p>\n

T\u1eeb kh\u00f3a: <\/i><\/b>C\u1ea5u tr\u00fac r\u1eebng, D\u1ebb gai ph\u00fa th\u1ecd, m\u1ed1i quan h\u1ec7 lo\u00e0i<\/p>\n

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Research on forest structure and relations between tree species of Castanopsis phuthoensis <\/i>in forest rehabilitation in Cau Hai, Phu Tho <\/b><\/p>\n

Castanopsis phuthoensis <\/i>Luong is an endemic tree species of Phu Tho province, only distributed narrowly in forest rehabilitation in two communes belonging to Doan Hung district. As it is difficult to find the seedling in the nature, research on forest structure and relations between tree species is very necessary to define method of conservation for this species. The species is dominant tree species in the forest rehabilitation with both IV% indexes and percent of each species for number of trees above 5% in nature regeneration forest and enrichmnet forest by additionally planting in holes in the forest, particularly nearly 10% in nature regeneration forest with high and medium density, and reaching 14.5% in enrichmnet forest by additionally planting in the holes, density of this species is very low, only from 3.1 to 11.1 trees per hectare. Diameter distributions of the species of number of trees is characterized by curve style with a peak in 20cm or 24cm diameter classes. Its height distributions are also curve style with a top in 18m or 20m heigh classes. This peaks are higher than diamter and heigh average of the rehabilitation forest. Both the diameter and heigh distributions are not suitable to Meyer, Weibull and Interrupted distribution. This species occurs itself and 31 other tree species, clearly grows in population, and often appears six other native tree species, including Ormosia balansae, Erythrophloeum fordii, Castanopsis cerebrina, Quercus platycalyx, Gironniera subaequalis <\/i>and Garcinia oblongifolia. <\/i><\/p>\n

Keywords: <\/i><\/b>Forest structure, Castanopsis phuthoensis, <\/i>relations between tree species<\/p>\n

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SINH TR\u01af\u1edeNG C\u1ee6A M\u1ed8T S\u1ed0 LO\u00c0I C\u00c2Y B\u1ea2N \u0110\u1ecaA TRONG R\u1eeaNG TR\u1ed2NG H\u1ed6N LO\u00c0I CUNG C\u1ea4P G\u1ed6 L\u1edaN \u1ede C\u1ea6U HAI, PH\u00da TH\u1ecc<\/b><\/p>\n

Ho\u00e0ng V\u0103n Th\u1eafng<\/b>1<\/b>, Nguy\u1ec5n Th\u1ecb Thi\u00eam<\/b>2<\/b>, \u0110o\u00e0n Th\u1ecb Th\u1ea3o<\/b>1 <\/b><\/p>\n

1<\/i>Vi\u1ec7n Khoa h\u1ecdc L\u00e2m nghi\u1ec7p Vi\u1ec7t Nam <\/i>2 <\/i>C\u00f4ng ty C\u1ed5 ph\u1ea7n \u0111\u1ea7u t\u01b0 v\u00e0 ph\u00e1t tri\u1ec3n l\u00e2m nghi\u1ec7p A&V<\/i><\/p>\n\n\n\n\n
T\u00d3M T\u1eaeT <\/b>C\u00e1c th\u00ed nghi\u1ec7m r\u1eebng tr\u1ed3ng h\u1ed7n lo\u00e0i c\u00e2y b\u1ea3n \u0111\u1ecba cung c\u1ea5p g\u1ed7 l\u1edbn t\u1ea1i Trung t\u00e2m Khoa h\u1ecdc L\u00e2m nghi\u1ec7p v\u00f9ng Trung t\u00e2m B\u1eafc b\u1ed9 \u1edf C\u1ea7u Hai, Ph\u00fa Th\u1ecd \u0111\u01b0\u1ee3c x\u00e2y d\u1ef1ng v\u00e0o th\u00e1ng 7\/2001 tr\u00ean \u0111\u1ea5t r\u1eebng tho\u00e1i h\u00f3a v\u1edbi c\u00e1c lo\u1ea1i th\u1ea3m che kh\u00e1c nhau l\u00e0 C\u1ed1t kh\u00ed v\u00e0 Keo tai t\u01b0\u1ee3ng. S\u1ed1 li\u1ec7u \u0111o \u0111\u1ebfm \u0111\u1ebfn n\u0103m 2014 cho th\u1ea5y, sau 14 n\u0103m tr\u1ed3ng c\u00e1c lo\u00e0i c\u00e2y Re g\u1eebng v\u00e0 S\u1ed3i ph\u1ea3ng trong c\u00e1c c\u00f4ng th\u1ee9c th\u00ed nghi\u1ec7m \u0111\u1ea1t t\u1ef7 l\u1ec7 s\u1ed1ng t\u1eeb 86,5 – 87,8% v\u00e0 c\u00f3 sinh tr\u01b0\u1edfng, ph\u00e1t tri\u1ec3n t\u1ed1t. M\u1ed9t s\u1ed1 c\u00e2y S\u1ed3i ph\u1ea3ng \u0111\u00e3 c\u00f3 th\u1ec3 cho khai th\u00e1c cung c\u1ea5p g\u1ed7 l\u1edbn (c\u00f3 \u0111\u01b0\u1eddng k\u00ednh ngang ng\u1ef1c \u0111\u1ea1t tr\u00ean 30cm), trong khi \u0111\u00f3 Tr\u00e1m tr\u1eafng v\u00e0 V\u1ea1ng tr\u1ee9ng c\u00f3 t\u1ef7 l\u1ec7 s\u1ed1ng th\u1ea5p (61,1 – 66,5%) v\u00e0 sinh tr\u01b0\u1edfng ph\u00e1t tri\u1ec3n k\u00e9m. T\u1ea1i tu\u1ed5i 14, c\u00e1c ch\u1ec9 ti\u00eau sinh tr\u01b0\u1edfng c\u1ee7a S\u1ed3i ph\u1ea3ng \u0111\u1ea1t trung b\u00ecnh l\u00e0 D1.3= 21cm,Hvn = 14,2m, Dt = 5,9m; Re g\u1eebng \u0111\u1ea1t D1.3 = 13,3cm,Hvn = 11m, Dt = 3,7m; V\u1ea1ng tr\u1ee9ng \u0111\u1ea1t D1.3 = 8,6cm, Hvn = 8,8m, Dt = 2,7m v\u00e0 Tr\u00e1m tr\u1eafng ch\u1ec9 \u0111\u1ea1t D1.3= 7cm, Hvn = 7,5cm v\u00e0 Dt = 2,2m. Tr\u1eef l\u01b0\u1ee3ng trung b\u00ecnh c\u1ee7a c\u00e1c lo\u00e0i c\u00e2y b\u1ea3n \u0111\u1ecba trong c\u00e1c c\u00f4ng th\u1ee9c dao \u0111\u1ed9ng t\u1eeb 69,4 – 94,7 m3\/ha (trung b\u00ecnh l\u00e0 86 m3\/ha), t\u0103ng tr\u01b0\u1edfng trung b\u00ecnh \u0111\u1ea1t t\u1eeb 5,4 – 6,7 m3\/ha\/n\u0103m (trung b\u00ecnh l\u00e0 6,1 m3\/ha\/n\u0103m). Ch\u1ea5t l\u01b0\u1ee3ng c\u00e2y (bao g\u1ed3m \u0111\u1ed9 nh\u1ecf c\u00e0nh, \u0111\u1ed9 th\u1eb3ng th\u00e2n v\u00e0 ph\u00e1t tri\u1ec3n ng\u1ecdn) c\u1ee7a c\u00e1c lo\u00e0i S\u1ed3i ph\u1ea3ng v\u00e0 Re g\u1eebng \u0111\u1ec1u t\u01b0\u01a1ng \u0111\u1ed1t t\u1ed1t, trong khi \u0111\u00f3 ch\u1ea5t l\u01b0\u1ee3ng c\u1ee7a c\u00e1c lo\u00e0i Tr\u00e1m tr\u1eafng v\u00e0 V\u1ea1ng ch\u1ee9ng k\u00e9m h\u01a1n do b\u1ecb c\u1ea1nh tranh m\u1ea1nh b\u1edfi c\u00e1c lo\u00e0i c\u00e2y kh\u00e1c trong m\u00f4 h\u00ecnh, \u0111\u1eb7c bi\u1ec7t l\u00e0 \u1edf c\u00f4ng th\u1ee9c c\u00e2y ph\u00f9 tr\u1ee3 l\u00e0 Keo tai t\u01b0\u1ee3ng ch\u01b0a \u0111\u01b0\u1ee3c t\u1ec9a th\u01b0a \u1edf tu\u1ed5i 14. Sinh tr\u01b0\u1edfng c\u1ee7a c\u00e1c lo\u00e0i c\u00e2y S\u1ed3i ph\u1ea3ng v\u00e0 Re g\u1eebng \u0111\u1ec1u \u0111\u1ea1t t\u1ed1t nh\u1ea5t trong c\u00f4ng th\u1ee9c c\u00e2y ph\u00f9 tr\u1ee3 l\u00e0 Keo tai t\u01b0\u1ee3ng.<\/p>\n

T\u1eeb kh\u00f3a: <\/i><\/b>C\u00e2y b\u1ea3n \u0111\u1ecba, C\u1ea7u Hai, Ph\u00fa Th\u1ecd, sinh tr\u01b0\u1edfng, g\u1ed7 l\u1edbn, r\u1eebng tr\u1ed3ng h\u1ed7n lo\u00e0i<\/p>\n

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Growth of some native tree species in mixed plantation for timber in Cau Hai, Phu Tho province <\/b><\/p>\n

Mixed plantation experiments by native species for timber at the Forest Science Centre for Central of North Vietnam in Cau Hai, Phu Tho province was established in 2001 on degraded forest land with different types of nurse trees such as Tephrosia candida <\/i>and Acacia mangium<\/i>. Measurement data in 2014 showed that, after 14 years of planting Cinnamomum obtusifolium <\/i>and Lithocarpus fissus <\/i>species in the experiments reached 86.5 to 87.8% survival rate, they have good growth and development. Some Lithocarpus fissus <\/i>trees was able to supply timber (DBH over 30 cm), while the Canarium album <\/i>and Endospermum chinensis <\/i>species have a low survival rate (from 61.1 to 66.5%) and poor growth and development. At age of 14, the growth of Lithocarpus fissus <\/i>species has D1.3 = 21cm, Hvn = 14.2m, Dt = 5.9m; Cinnamomum obtusifolium <\/i>species reached D1.3 = 13.3cm, Hvn = 11m, Dt = 3.7m; Endospermum chinensis <\/i>species has D1.3 = 8.6cm, Hvn = 8.8m, Dt = 2.7m white Canarium album <\/i>speices reached only D1.3 = 7cm only, Hvn = 7.5 cm and Dt = 2.2m. The average yield of native species in the models ranged from 69.4 – 94.7 m3\/ha (average is 86 m3\/ha), the average increment from 5.4 – 6.7 m3\/ha\/year (average is 6.1 m3\/ha\/year). Quality trees (including the small branches, stem straightness and development canopy) of Lithocarpus fissus <\/i>and Cinnamomum obtusifolium <\/i>species are good while Canarium album <\/i>and Endospermum chinensis <\/i>species are bad due to competed by other species in the experiments, especially in the experiment of nurse tree of Acacia mangium <\/i>not been thinning at the age of 14 yet. Lithocarpus fissus <\/i>and Cinnamomum obtusifolium <\/i>species growth best in experiment of nurse tree is Acacia mangium<\/i>.<\/p>\n

Keywords: <\/i><\/b>Cau Hai, Phu Tho province, mixed plantations, native tree, timber, growth<\/p>\n

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TRI\u1ec2N V\u1eccNG G\u1ed6 L\u1edaN C\u1ee6A M\u1ed8T S\u1ed0 M\u00d4 H\u00ccNH TR\u1ed2NG C\u00c1C LO\u00c0I KEO \u1ede B\u00ccNH \u0110\u1ecaNH V\u00c0 PH\u00da Y\u00caN<\/b><\/p>\n

Nguy\u1ec5n Huy S\u01a1n, Ph\u1ea1m \u0110\u00ecnh S\u00e2m <\/b><\/p>\n

Vi\u1ec7n Nghi\u00ean c\u1ee9u L\u00e2m sinh, Vi\u1ec7n Khoa h\u1ecdc L\u00e2m nghi\u1ec7p Vi\u1ec7t Nam<\/i><\/p>\n\n\n\n\n
T\u00d3M T\u1eaeT <\/b>N\u1ebfu quan ni\u1ec7m r\u1eebng tr\u1ed3ng g\u1ed7 l\u1edbn c\u00f3 \u0111\u01b0\u1eddng k\u00ednh ngang ng\u1ef1c trung b\u00ecnh (D1,3) \u2265 18cm th\u00ec c\u00e1c m\u00f4 h\u00ecnh tr\u1ed3ng Keo lai (A. hybrids<\/i>) t\u1eeb 6 – 10 n\u0103m tu\u1ed5i tr\u1ed3ng \u1edf B\u00ecnh \u0110\u1ecbnh v\u00e0 Ph\u00fa Y\u00ean ch\u01b0a c\u00f3 kh\u1ea3 n\u0103ng cung c\u1ea5p g\u1ed7 l\u1edbn, m\u00f4 h\u00ecnh t\u1ed1t nh\u1ea5t c\u0169ng ch\u1ec9 c\u00f3 D1,3 \u2248 16,67cm, m\u00f4 h\u00ecnh k\u00e9m nh\u1ea5t c\u00f3 D1,3 \u2248 9,18cm; tr\u1eef l\u01b0\u1ee3ng g\u1ed7 c\u00e2y \u0111\u1ee9ng (M) cao nh\u1ea5t \u2248 133,51m3\/ha, th\u1ea5p nh\u1ea5t \u2248 57,96m3\/ha\/n\u0103m; n\u0103ng su\u1ea5t g\u1ed7 (\u0394M) cao nh\u1ea5t c\u0169ng ch\u1ec9 \u0111\u1ea1t 19,07m3\/ha\/n\u0103m v\u00e0 th\u1ea5p nh\u1ea5t l\u00e0 9,06m3\/ha\/n\u0103m. Keo tai t\u01b0\u1ee3ng (A. mangium<\/i>) c\u00f3 hai m\u00f4 h\u00ecnh \u0111i\u1ec3n h\u00ecnh \u0111\u00e3 c\u00f3 kh\u1ea3 n\u0103ng cung c\u1ea5p g\u1ed7 l\u1edbn, m\u00f4 h\u00ecnh 10 n\u0103m tu\u1ed5i \u1edf B\u00ecnh \u0110\u1ecbnh, \u0111\u01b0\u1eddng k\u00ednh trung b\u00ecnh (D1,3) \u224823,38cm, tr\u1eef l\u01b0\u1ee3ng g\u1ed7 c\u00e2y \u0111\u1ee9ng (M) \u2248 231,88m3\/ha, n\u0103ng su\u1ea5t (\u0394M) \u2248 23,19m3\/ha\/n\u0103m. M\u00f4 h\u00ecnh 20 n\u0103m tu\u1ed5i \u1edf Ph\u00fa Y\u00ean c\u00f3 \u0111\u01b0\u1eddng k\u00ednh trung b\u00ecnh (D1,3) \u224835,63cm, tr\u1eef l\u01b0\u1ee3ng g\u1ed7 c\u00e2y \u0111\u1ee9ng (M) \u2248 305,03m3\/ha, n\u0103ng su\u1ea5t (\u0394M) \u2248 15,25m3\/ha\/n\u0103m. Keo l\u00e1 tr\u00e0m c\u00f3 04 m\u00f4 h\u00ecnh tr\u1ed3ng thu\u1ea7n lo\u00e0i v\u00e0 01 m\u00f4 h\u00ecnh tr\u1ed3ng h\u1ed7n lo\u00e0i v\u1edbi Sao \u0111en, trong \u0111\u00f3 c\u00f3 01 m\u00f4 h\u00ecnh 14 n\u0103m tu\u1ed5i, c\u00f2n l\u1ea1i t\u1eeb 20 – 21 n\u0103m tu\u1ed5i. X\u00e9t v\u1ec1 \u0111\u01b0\u1eddng k\u00ednh th\u00ec ch\u1ec9 c\u00f3 01 m\u00f4 h\u00ecnh tr\u1ed3ng thu\u1ea7n lo\u00e0i 20 n\u0103m tu\u1ed5i v\u00e0 01 m\u00f4 h\u00ecnh tr\u1ed3ng h\u1ed7n lo\u00e0i v\u1edbi Sao \u0111en 21 n\u0103m tu\u1ed5i \u1edf B\u00ecnh \u0110\u1ecbnh \u0111\u00e3 c\u00f3 kh\u1ea3 n\u0103ng cung c\u1ea5p g\u1ed7 l\u1edbn, \u0111\u01b0\u1eddng k\u00ednh (D1,3) \u2248 21,39 – 24,99cm, tr\u1eef l\u01b0\u1ee3ng c\u00e2y \u0111\u1ee9ng (M) \u2248 198,27 – 224,89m3\/ha, n\u0103ng su\u1ea5t (\u0394M) \u2248 9,44 – 11,24m3\/ha\/n\u0103m. C\u00e1c m\u00f4 h\u00ecnh c\u00f2n l\u1ea1i c\u00f3 D1,3 \u2248 14,61 – 16,85cm, tr\u1eef l\u01b0\u1ee3ng c\u00e2y \u0111\u1ee9ng (M) \u2248 93,36 – 156,06m3\/ha, n\u0103ng su\u1ea5t (\u0394M) \u2248 6,67 – 7,43m3\/ha\/n\u0103m. Tuy nhi\u00ean, kh\u1ea3 n\u0103ng t\u0103ng tr\u01b0\u1edfng v\u1ec1 \u0111\u01b0\u1eddng k\u00ednh c\u1ee7a h\u1ea7u h\u1ebft c\u00e1c m\u00f4 h\u00ecnh \u0111\u1ec1u kh\u00e1 ch\u1eadm, n\u1ebfu \u00e1p d\u1ee5ng c\u00e1c bi\u1ec7n ph\u00e1p k\u1ef9 thu\u1eadt l\u00e2m sinh th\u00edch h\u1ee3p, c\u00e1c m\u00f4 h\u00ecnh n\u00e0y c\u0169ng r\u1ea5t c\u00f3 tri\u1ec3n v\u1ecdng cung c\u1ea5p g\u1ed7 l\u1edbn trong kho\u1ea3ng t\u1eeb 5 – 7 n\u0103m t\u1edbi.<\/p>\n

T\u1eeb kh\u00f3a: <\/i><\/b>G\u1ed7 l\u1edbn, Keo lai (Acacia hybrid<\/i>), Keo tai t\u01b0\u1ee3ng (A. mangium<\/i>), Keo l\u00e1 tr\u00e0m (A. auriculiformis<\/i>), B\u00ecnh \u0110\u1ecbnh, Ph\u00fa Y\u00ean<\/p>\n

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The potential sawlog production of acacia plantations in Binh Dinh and Phu Yen <\/b><\/p>\n

If requirement of diameter at breast height (DBH) for sawlog is greater than 18 cm, almost Acacia hybrid plantation within 6 – 10 year – old in Binh Dinh and Phu Yen province cannot meet this requirement; DBH, standing volume and MAI of the poorest and fastes growth rate plantations were 9.18 and 16.67 cm, 57.96 and 133.51 m3\/ha, and 9.06 and 19.07 m3\/ha\/year, respectively. For Acacia mangium<\/i>, there are only two plantations which were 10 year – old in Binh Dinh province having DBH, standing volume and MAI of 23.38 cm, 231.88 m3\/ha and 23.19 m3\/ha\/year, respectively. There was a 20 year – old plantation in Phu Yen province which had DBH, standing volume and MAI of 35.63 cm, 305.03 m3\/ha and 15.25 m3\/ha\/year, respectively. For Acacia auriculiformis<\/i>, there were four single – species plantations (pure A. auriculiformis<\/i>) and a mixed – species plantation (A. auriculiformis <\/i>+ Hopea odorata<\/i>); one of them was 14 year – old and the others were 20 – 21 year – old. However, only one 20 year – old single – species plantation and the 21 year – old mixed – species plantation which have timber that can be used for sawlog; DBH, standing volume and MAI of 21.39 and 24.99 cm, 198.27 and 224.89 m3\/ha and 9.44 and 11.24 m3\/ha\/year, respectively. DBH, standing volume and MAI of the other plantations were 14.61 – 16.85 cm, 93.36 – 156.06 m3\/ha, and 6.67 – 7.43 m3\/ha\/year. DBH growth in almost plantation were low. Further intervention by silviculture techniques should be applied, so timber of these plantations can be used for sawlog in the next 5 – 7 years.<\/p>\n

Keywords: <\/i><\/b>Sawlog, Acacia <\/i>hybrid, Acacia mangium<\/i>, Acacia auriculiformis<\/i>, Binh Dinh and Phu Yen<\/p>\n

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

\u1ee8NG D\u1ee4NG VI\u1ec4N TH\u00c1M LANDSAT \u0110A TH\u1edcI GIAN V\u00c0 GIS \u0110\u00c1NH GI\u00c1 BI\u1ebeN \u0110\u1ed8NG DI\u1ec6N T\u00cdCH R\u1eeaNG NG\u1eacP M\u1eb6N VEN BI\u1ec2N HUY\u1ec6N TI\u00caN Y\u00caN, T\u1ec8NH QU\u1ea2NG NINH GIAI \u0110O\u1ea0N 1994 – 2015<\/b><\/p>\n

Nguy\u1ec5n H\u1ea3i H\u00f2a <\/b><\/p>\n

B\u1ed9 m\u00f4n K\u1ef9 thu\u1eadt m\u00f4i tr\u01b0\u1eddng, Tr\u01b0\u1eddng \u0110\u1ea1i h\u1ecdc L\u00e2m nghi\u1ec7p Vi\u1ec7t Nam<\/i><\/p>\n\n\n\n\n
T\u00d3M T\u1eaeT <\/b>Vi\u1ec7c s\u1eed d\u1ee5ng \u1ea3nh vi\u1ec5n th\u00e1m Landsat \u0111a ph\u1ed5 \u0111\u1ec3 \u0111\u00e1nh gi\u00e1 bi\u1ebfn \u0111\u1ed9ng di\u1ec7n t\u00edch r\u1eebng ng\u1eadp m\u1eb7n ven bi\u1ec3n v\u1edbi \u0111\u1ed9 ch\u00ednh x\u00e1c tr\u00ean 83% m\u1ed9t l\u1ea7n n\u1eefa t\u00e1i kh\u1eb3ng \u0111\u1ecbnh vi\u1ec7c s\u1eed d\u1ee5ng \u1ea3nh vi\u1ec5n th\u00e1m Landsat \u0111\u1ec3 nghi\u00ean c\u1ee9u bi\u1ebfn \u0111\u1ed9ng t\u00e0i nguy\u00ean r\u1eebng ng\u1eadp m\u1eb7n l\u00e0 ph\u00f9 h\u1ee3p v\u00e0 c\u00f3 \u0111\u1ed9 tin c\u1eady trong b\u1ed1i c\u1ea3nh ngu\u1ed3n d\u1eef li\u1ec7u n\u00e0y s\u1eb5n c\u00f3 v\u00e0 mi\u1ec5n ph\u00ed. K\u1ebft qu\u1ea3 \u0111\u00e1nh gi\u00e1 bi\u1ebfn \u0111\u1ed9ng v\u1ec1 di\u1ec7n t\u00edch r\u1eebng ng\u1eadp m\u1eb7n huy\u1ec7n Ti\u00ean Y\u00ean, t\u1ec9nh Qu\u1ea3ng Ninh cho th\u1ea5y di\u1ec7n t\u00edch r\u1eebng t\u0103ng t\u1eeb 3021.6ha n\u0103m 1994, l\u00ean 3544.8ha n\u0103m 2015, t\u0103ng th\u00eam 523.2ha, \u0111\u1eb7c bi\u1ec7t trong giai \u0111o\u1ea1n 2003 – 2008 v\u00e0 2010 – 2015 di\u1ec7n t\u00edch r\u1eebng ng\u1eadp m\u1eb7n t\u0103ng th\u00eam l\u1ea7n l\u01b0\u1ee3t l\u00e0 824.5ha (34,2%) v\u00e0 910.8ha (34,6%), nh\u01b0ng di\u1ec7n t\u00edch t\u0103ng l\u00ean ch\u1ee7 y\u1ebfu l\u00e0 r\u1eebng tr\u1ed3ng v\u00e0 ch\u1ea5t l\u01b0\u1ee3ng r\u1eebng ch\u01b0a cao. Di\u1ec7n t\u00edch r\u1eebng ng\u1eadp m\u1eb7n t\u0103ng l\u00ean ch\u1ee7 y\u1ebfu l\u00e0 do c\u00f3 c\u00e1c d\u1ef1 \u00e1n tr\u1ed3ng v\u00e0 ph\u1ee5c h\u1ed3i r\u1eebng ng\u1eadp m\u1eb7n ph\u00f2ng h\u1ed9 ven bi\u1ec3n qua ngu\u1ed3n v\u1ed1n qu\u1ed1c t\u1ebf t\u00e0i tr\u1ee3 theo c\u00e1c ch\u01b0\u01a1ng tr\u00ecnh tr\u1ed3ng r\u1eebng ng\u1eadp m\u1eb7n c\u1ee7a h\u1ed9i ch\u1eef th\u1eadp \u0111\u1ecf, ho\u1ea1t \u0111\u1ed9ng ph\u1ee5c h\u1ed3i r\u1eebng ng\u1eadp m\u1eb7n c\u1ee7a t\u1ed5 ch\u1ee9c ACMANG Nh\u1eadt B\u1ea3n. Tr\u00ean c\u01a1 s\u1edf k\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u, b\u00e0i b\u00e1o \u0111\u00e3 \u0111\u1ec1 xu\u1ea5t m\u1ed9t s\u1ed1 gi\u1ea3i ph\u00e1p nh\u1eb1m n\u00e2ng cao hi\u1ec7u qu\u1ea3 b\u1ea3o v\u1ec7 v\u00e0 ph\u00e1t tri\u1ec3n r\u1eebng ng\u1eadp m\u1eb7n ven bi\u1ec3n khu v\u1ef1c nghi\u00ean c\u1ee9u, g\u1ed3m nh\u00f3m gi\u1ea3i ph\u00e1p v\u1ec1 qu\u1ea3n l\u00fd, nh\u00f3m gi\u1ea3i ph\u00e1p v\u1ec1 c\u00f4ng t\u00e1c tr\u1ed3ng r\u1eebng, gi\u1ea3i ph\u00e1p k\u1ef9 thu\u1eadt v\u00e0 kinh t\u1ebf x\u00e3 h\u1ed9i.<\/p>\n

T\u1eeb kh\u00f3a: <\/i><\/b>Bi\u1ebfn \u0111\u1ed9ng r\u1eebng, r\u1eebng ng\u1eadp m\u1eb7n ven bi\u1ec3n, s\u1eed d\u1ee5ng \u0111\u1ea5t, vi\u1ec5n th\u00e1m, h\u1ec7 th\u1ed1ng th\u00f4ng tin \u0111\u1ecba l\u00fd<\/p>\n

 <\/td>\n<\/tr>\n

Application of multispectral landsat data and GIS to monitor changes in coastal mangroves in Tien Yen district, Quang Ninh province during 1994 \u2013 2015<\/b><\/p>\n

\u00a0<\/b>Using multispectral Landsat images to monitor the changes in coastal mangroves indicates that the accurracy of classified images is more than 83%, this result therefore has reconfirmed that using Landsat images for quantifying changes in coastal mangroves is suitable and appropriate as they are freely available. The study shows that the extents of coastal mangroves have increased from 1994 to 2015, estimated at 523.2ha, in particular during the periods of 2003 – 2008 and 2010 – 2015, the extents of coastal mangroves have increased by 824.4ha (equivalent to 34.2%) and 910.8ha (equivalent to 34.6%). However, increased areas are mainly mangrove plantation with low quality as a result of mangrove plantation; mangrove rehabilitation and restoration programs from both international and national projects, namely Red Cross, ACMANG from Japan. Based on the findings, the paper suggests possible solutions for enhancing mangrove development and protection in study areas, namely enhancement of management schemes, suitable mangrove plantation approaches, socioeconomic and technical measures.<\/p>\n

Keywords: <\/i><\/b>Coastal mangroves, GIS, land use, mangrove changes, remote sensing.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

T\u1ea0O N\u1ed8I SINH NH\u00c2N T\u1ea0O N\u1ea4M B\u1ea0CH C\u01af\u01a0NG (Beauveria bassiana<\/i>) CHO B\u1ea0CH \u0110\u00c0N CAMAL \u0110\u1ec2 PH\u00d2NG TR\u1eea ONG \u0110EN (Leptocybe invasa<\/i>) G\u00c2Y U B\u01af\u1edaU<\/b><\/p>\n

L\u00ea V\u0103n B\u00ecnh, \u0110\u1eb7ng Nh\u01b0 Qu\u1ef3nh, Ph\u1ea1m Quang Thu <\/b><\/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<\/i><\/p>\n\n\n\n\n
T\u00d3M T\u1eaeT <\/b>N\u1ea5m B\u1ea1ch c\u01b0\u01a1ng (Beauveria bassiana<\/i>) l\u00e0 m\u1ed9t lo\u00e0i n\u1ea5m k\u00fd sinh ph\u1ed5 bi\u1ebfn \u0111\u1ed1i v\u1edbi nhi\u1ec1u lo\u00e0i c\u00f4n tr\u00f9ng. C\u00e1c ch\u1ebf ph\u1ea9m t\u1eeb n\u1ea5m B. bassiana <\/i>\u0111\u00e3 \u0111\u01b0\u1ee3c bi\u1ebft \u0111\u1ebfn v\u00e0 s\u1eed d\u1ee5ng r\u1ed9ng r\u00e3i \u0111\u1ec3 ph\u00f2ng tr\u1eeb sinh h\u1ecdc trong n\u00f4ng, l\u00e2m nghi\u1ec7p. Nhi\u1ec1u ch\u1ee7ng n\u1ea5m \u0111\u01b0\u1ee3c nh\u00e2n sinh kh\u1ed1i v\u00e0 s\u1ea3n xu\u1ea5t thu\u1ed1c tr\u1eeb s\u00e2u sinh h\u1ecdc \u1edf nhi\u1ec1u qu\u1ed1c gia. Lo\u00e0i n\u1ea5m n\u00e0y \u0111\u00e3 \u0111\u01b0\u1ee3c ph\u00e1t hi\u1ec7n s\u1ed1ng n\u1ed9i sinh t\u1ef1 nhi\u00ean v\u1edbi r\u1ea5t nhi\u1ec1u lo\u00e0i th\u1ef1c v\u1eadt. M\u1ed9t s\u1ed1 nghi\u00ean c\u1ee9u \u0111\u00e3 ch\u1ec9 ra r\u1eb1ng n\u1ea5m B\u1ea1ch c\u01b0\u01a1ng (B. bassiana<\/i>) c\u00f3 th\u1ec3 s\u1ed1ng n\u1ed9i sinh nh\u00e2n t\u1ea1o v\u1edbi m\u1ed9t s\u1ed1 lo\u00e0i th\u1ef1c v\u1eadt. Khi g\u00e2y nhi\u1ec5m, s\u1ee3i n\u1ea5m x\u00e2m nhi\u1ec5m, lan truy\u1ec1n v\u00e0 s\u1ed1ng trong m\u00f4 c\u1ee7a th\u1ef1c v\u1eadt. Cho \u0111\u1ebfn ng\u00e0y nay, n\u1ea5m B\u1ea1ch c\u01b0\u01a1ng \u0111\u00e3 \u0111\u01b0\u1ee3c ghi nh\u1eadn s\u1ed1ng n\u1ed9i sinh nh\u00e2n t\u1ea1o tr\u00ean c\u00e1c lo\u00e0i c\u00e2y nh\u01b0: Ng\u00f4, Khoai t\u00e2y, C\u00e0 chua, Ca cao, B\u00f4ng, L\u00faa m\u1ef3 v\u00e0 Chu\u1ed1i. B\u00e0i b\u00e1o n\u00e0y tr\u00ecnh b\u00e0y th\u00ed nghi\u1ec7m t\u1ea1o n\u1ed9i sinh nh\u00e2n t\u1ea1o n\u1ea5m B\u1ea1ch c\u01b0\u01a1ng (B. bassiana<\/i>) cho c\u00e2y B\u1ea1ch \u0111\u00e0n camal (Eucalyptus camaldulensis<\/i>) \u0111\u1ec3 ph\u00f2ng tr\u1eeb lo\u00e0i Ong \u0111en (Leptocybe invasa<\/i>) g\u00e2y u b\u01b0\u1edbu. Nhi\u1ec5m nh\u00e2n t\u1ea1o n\u1ea5m B\u1ea1ch c\u01b0\u01a1ng \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n theo 2 ph\u01b0\u01a1ng ph\u00e1p: t\u01b0\u1edbi b\u00e0o t\u1eed n\u1ed3ng \u0111\u1ed9 108CFU\/ml v\u00e0o h\u1ea1t gi\u1ed1ng n\u1ea3y m\u1ea7m v\u00e0 h\u1ea1t gi\u1ed1ng n\u1ea3y m\u1ea7m tr\u00ean h\u1ec7 s\u1ee3i n\u1ea5m trong th\u1eddi gian 7 ng\u00e0y. K\u1ebft qu\u1ea3 ch\u1ec9 ra r\u1eb1ng sau 12 tu\u1ea7n nhi\u1ec5m n\u1ea5m, n\u1ea5m B\u1ea1ch c\u01b0\u01a1ng s\u1ed1ng v\u00e0 t\u1ed3n t\u1ea1i trong l\u00e1, ch\u1ed3i v\u00e0 th\u00e2n c\u00e2y con B\u1ea1ch \u0111\u00e0n camal v\u1edbi t\u1ef7 l\u1ec7 76,7% \u0111\u1ed1i v\u1edbi ph\u01b0\u01a1ng ph\u00e1p t\u01b0\u1edbi dung d\u1ecbch b\u00e0o t\u1eed v\u00e0 80,0% \u0111\u1ed1i v\u1edbi ph\u01b0\u01a1ng ph\u00e1p h\u1ea1t gi\u1ed1ng n\u1ea3y m\u1ea7m tr\u00ean h\u1ec7 s\u1ee3i n\u1ea5m. Chi\u1ec1u cao c\u1ee7a c\u00e2y con nhi\u1ec5m n\u1ea5m cao h\u01a1n 33,2% v\u00e0 t\u1ef7 l\u1ec7 b\u1ecb h\u1ea1i gi\u1ea3m 82,1% so v\u1edbi \u0111\u1ed1i ch\u1ee9ng c\u00e2y con kh\u00f4ng nhi\u1ec5m n\u1ea5m. M\u1ee9c \u0111\u1ed9 b\u1ecb h\u1ea1i c\u1ee7a c\u00e2y con nhi\u1ec5m n\u1ea5m r\u1ea5t nh\u1ecf trong khi \u0111\u00f3 c\u00e2y kh\u00f4ng nhi\u1ec5m n\u1ea5m b\u1ecb h\u1ea1i n\u1eb7ng. K\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u tr\u00ean m\u1edf ra m\u1ed9t tri\u1ec3n v\u1ecdng m\u1edbi trong ph\u00f2ng tr\u1eeb s\u00e2u h\u1ea1i.<\/p>\n

T\u1eeb kh\u00f3a: <\/i><\/b>N\u1ed9i sinh nh\u00e2n t\u1ea1o, Beauveria bassiana, Eucalyptus camaldulensis, Leptocybe invasa<\/i><\/p>\n

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Establishing the entomopathogenic fungus Beauveria bassiana <\/i>as an artificial endophyte in Eucalyptus camaldulensis <\/i>for the control of the gall wasp Leptocybe invasa<\/i>. <\/b><\/p>\n

The fungus Beauveria bassiana <\/i>is a common fungal parasite of many arthropod species. The entomopathogenic properties of B. bassiana <\/i>are well-known and it is used widely in biological control strategies in agriculture and forestry. Some strains of the fungus are mass-produced as commercial biological insecticides in many countries. This fungus can live as a natural endophyte in various plant species. Some studies have shown that B. bassiana <\/i>can survive as an artificial endophyte in several plants. Its mycelium can infect, colonize and survive in plant tissues after artificial inoculation. Until now, B. bassiana <\/i>has been reported only as an artificial endophyte of maize, potato, tomato, cocoa, cotton, wheat and banana. Therefore, the aim of this study is to experiment B. bassiana <\/i>as an artificical endophyte of Eucalyptus camaldulensis <\/i>for the control of the gall wasp Leptocybe invasa<\/i>. We established artificial inoculation of the fungus as an endophyte in E. camaldulensis <\/i>seedlings using two methods: (1) geminated seeds were drenched with conidial solution with a concentration of 108 CFU\/ml of B. bassiana<\/i>, and (2) germinated seeds were grown in a fungal mat of B. bassiana <\/i>for 7 days. Results showed that at 12 weeks post-inoculation, B. bassiana <\/i>had colonized the leaves, shoots and stems of the seedlings, with 76.7% of seedlings colonized using the conidial solution on germinated seeds and 80.0% colonized using germinated seeds grown in fungal mats. Height of seedlings colonized with B. bassiana <\/i>was increased by 33.2% compared to non-inoculated control seedlings. Damage index scored for L. invasa <\/i>on colonized seedlings was reduced by 82.1% compared to control seedlings and the damage severity of the colonized seedlings was also low, in the other hand, the non-colonized control seedlings got high level of damage.<\/p>\n

Keywords: <\/i><\/b>Artificial endophyte, Beauveria bassiana, Eucalyptus camaldulensis, Leptocybe invasa.<\/i><\/p>\n

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NGHI\u00caN C\u1ee8U M\u1eacT \u0110\u1ed8 B\u00c0O T\u1eec N\u1ea4M Ceratocystis manginecans <\/i>PH\u00c1T T\u00c1N TRONG R\u1eeaNG KEO L\u00c1 TR\u00c0M, KEO LAI V\u00c0 KEO TAI T\u01af\u1ee2NG T\u1ea0I VI\u1ec6T NAM<\/b><\/p>\n

Nguy\u1ec5n Minh Ch\u00ed, Ph\u1ea1m Quang Thu <\/b><\/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<\/i><\/p>\n\n\n\n\n
T\u00d3M T\u1eaeT <\/b>B\u1ec7nh ch\u1ebft h\u00e9o do n\u1ea5m Ceratocystis manginecans <\/i>g\u00e2y h\u1ea1i r\u1eebng tr\u1ed3ng c\u00e1c lo\u00e0i keo \u0111ang l\u00e0 v\u1ea5n \u0111\u1ec1 l\u1edbn \u1edf Vi\u1ec7t Nam v\u00e0 nhi\u1ec1u qu\u1ed1c gia kh\u00e1c. Th\u00ed nghi\u1ec7m b\u1eaby b\u00e0o t\u1eed n\u1ea5m C. manginecans <\/i>b\u1eb1ng lam k\u00ednh \u0111\u01b0\u1ee3c ph\u1ee7 k\u00edn hai m\u1eb7t b\u1eb1ng vaselin trong c\u00e1c l\u00f4 r\u1eebng \u0111\u00e3 \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh b\u1ecb b\u1ec7nh ch\u1ebft h\u00e9o g\u00e2y h\u1ea1i g\u1ed3m r\u1eebng Keo l\u00e1 tr\u00e0m t\u1ea1i B\u00ecnh D\u01b0\u01a1ng v\u00e0 \u0110\u1ed3ng Nai; r\u1eebng keo lai t\u1ea1i Tuy\u00ean Quang v\u00e0 Y\u00ean B\u00e1i; r\u1eebng Keo tai t\u01b0\u1ee3ng t\u1ea1i Ph\u00fa Th\u1ecd v\u00e0 Y\u00ean B\u00e1i \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh \u0111\u1ed9 cao ph\u00e1t t\u00e1n v\u00e0 m\u1eadt \u0111\u1ed9 ph\u00e1t t\u00e1n b\u00e0o t\u1eed n\u1ea5m C. manginecans<\/i>. K\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u cho th\u1ea5y m\u1eadt \u0111\u1ed9 b\u00e0o t\u1eed ph\u00e1t t\u00e1n trong r\u1eebng Keo tai t\u01b0\u1ee3ng v\u00e0 keo lai cao h\u01a1n so v\u1edbi trong r\u1eebng Keo l\u00e1 tr\u00e0m. B\u00e0o t\u1eed n\u1ea5m C. manginecans <\/i>xu\u1ea5t hi\u1ec7n \u1edf t\u1ea5t c\u1ea3 c\u00e1c \u0111\u1ed9 cao \u0111\u1eb7t b\u1eaby t\u1eeb 60 – 150cm so v\u1edbi m\u1eb7t \u0111\u1ea5t v\u00e0 t\u1eadp trung nhi\u1ec1u nh\u1ea5t \u1edf \u0111\u1ed9 cao t\u1eeb 110 – 120cm. M\u1eadt \u0111\u1ed9 trung b\u00ecnh \u1edf kho\u1ea3ng \u0111\u1ed9 cao n\u00e0y \u0111\u1ea1t t\u1eeb 75,0 – 78,1 b\u00e0o t\u1eed\/b\u1eaby\/tu\u1ea7n v\u1edbi r\u1eebng Keo l\u00e1 tr\u00e0m, t\u1eeb 78,1 – 84,4 b\u00e0o t\u1eed\/b\u1eaby\/tu\u1ea7n v\u1edbi r\u1eebng keo lai v\u00e0 84,4 – 87,5 b\u00e0o t\u1eed\/b\u1eaby\/tu\u1ea7n v\u1edbi r\u1eebng Keo tai t\u01b0\u1ee3ng. \u0110\u1ed9 cao t\u1ed1i \u01b0u t\u1ea1o v\u1ebft th\u01b0\u01a1ng v\u00e0o g\u1ed7 tr\u00ean th\u00e2n c\u00e2y keo \u0111\u1ec3 b\u1eaby b\u00e0o t\u1eed n\u1ea5m hi\u1ec7u qu\u1ea3 nh\u1ea5t l\u00e0 t\u1eeb 110cm ho\u1eb7c 120cm so v\u1edbi m\u1eb7t \u0111\u1ea5t.<\/p>\n

T\u1eeb kh\u00f3a: <\/i><\/b>B\u1ec7nh ch\u1ebft h\u00e9o, b\u1eaby b\u00e0o t\u1eed, Ceratocystis manginecans<\/i>, Keo l\u00e1 tr\u00e0m, keo lai, Keo tai t\u01b0\u1ee3ng<\/p>\n

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Spore trap study in Acacia auriculiformis<\/i>, acacia <\/i>hybrids and Acacia mangium <\/i>plantations in Vietnam <\/b>Ceratocystis wilt disease of acacia plantations caused by Ceratocystis manginecans <\/i>is now a major problem in Vietnam and other countries. A spore trap using slides with vaselin in both sides study was undertaken in diseased Acacia auriculiformis <\/i>plantations in Binh Duong and Dong Nai provinces, Acacia <\/i>hybrid plantations in Tuyen Quang and Yen Bai provinces, and A. mangium <\/i>plantations in Phu Tho and Yen Bai provinces, to determine the height of spore discharge and spore density of C. manginecans<\/i>. The findings showed that spore density measured as colony forming units (CFU), was higher in A. mangium <\/i>and Acacia <\/i>hybrid plantations compared to A. auriculiformis <\/i>plantations. The C. manginecans <\/i>spores were discharged from 60cm to 150cm in height above land surface but the largest number of spores was found at 110 – 120cm height. At this height, the average number of spores was 70.5 – 78.1 CFU\/trap\/week, 78.1 – 84.4 CFU\/trap\/week and 84.4 – 87.5 CFU\/trap\/week in A. auriculiformis <\/i>plantations, Acacia <\/i>hybrid plantations and A. mangium <\/i>plantations, respectively. The optimal height for making wounds to achieve the highest density of spores on acacia stems was 110cm or 120cm above land surface.<\/p>\n

Keywords: <\/i><\/b>Acacia auriculiformis, Acacia hybrids, Acacia mangium, Ceratocystis manginecans<\/i>, spore trap, wilt disease<\/p>\n

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\u0110\u1eb6C \u0110I\u1ec2M SINH H\u1eccC C\u1ee6A N\u1ea4M TH\u01af\u1ee2NG HO\u00c0NG (Phellinus linteus<\/i>) TRONG NU\u00d4I C\u1ea4Y THU\u1ea6N KHI\u1ebeT<\/b><\/p>\n

Ph\u1ea1m Quang Thu <\/b><\/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<\/i><\/p>\n\n\n\n\n
T\u00d3M T\u1eaeT <\/b>N\u1ea5m Th\u01b0\u1ee3ng ho\u00e0ng (Phellinus linteus<\/i>) l\u00e0 m\u1ed9t lo\u00e0i n\u1ea5m d\u01b0\u1ee3c li\u1ec7u n\u1ed5i ti\u1ebfng \u1edf c\u00e1c n\u01b0\u1edbc ph\u01b0\u01a1ng \u0110\u00f4ng v\u1edbi c\u00e1c ho\u1ea1t t\u00ednh sinh h\u1ecdc phong ph\u00fa, \u0111\u1eb7c bi\u1ec7t trong ph\u00f2ng ch\u1ed1ng ung th\u01b0. Vi\u1ec7c khai th\u00e1c lo\u00e0i n\u1ea5m n\u00e0y ch\u1ee7 y\u1ebfu \u0111\u01b0\u1ee3c thu h\u00e1i ngo\u00e0i t\u1ef1 nhi\u00ean v\u00e0 \u0111ang c\u00f3 nguy c\u01a1 tuy\u1ec7t ch\u1ee7ng. C\u00e1c nghi\u00ean c\u1ee9u v\u1ec1 \u0111\u1eb7c \u0111i\u1ec3m sinh h\u1ecdc trong nu\u00f4i c\u1ea5y thu\u1ea7n khi\u1ebft r\u1ea5t c\u1ea7n thi\u1ebft v\u00e0 c\u00f3 th\u1ec3 \u1ee9ng d\u1ee5ng \u0111\u1ec3 nu\u00f4i tr\u1ed3ng th\u1ec3 qu\u1ea3. Nghi\u00ean c\u1ee9u \u0111\u1eb7c \u0111i\u1ec3m sinh h\u1ecdc c\u1ee7a n\u1ea5m Th\u01b0\u1ee3ng ho\u00e0ng (P. Linteus<\/i>) trong nu\u00f4i c\u1ea5y thu\u1ea7n khi\u1ebft \u0111\u01b0\u1ee3c ti\u1ebfn h\u00e0nh v\u1edbi 3 c\u00f4ng th\u1ee9c m\u00f4i tr\u01b0\u1eddng (PDA, GYA v\u00e0 PGA), 6 c\u00f4ng th\u1ee9c nhi\u1ec7t \u0111\u1ed9 (10oC, 15oC, 20oC, 25oC, 30oC v\u00e0 35oC), 6 c\u00f4ng th\u1ee9c \u1ea9m \u0111\u1ed9 (75%, 80%, 85%, 90%, 95% v\u00e0 100%), 4 c\u00f4ng th\u1ee9c th\u1eddi gian nu\u00f4i c\u1ea5y. K\u1ebft qu\u1ea3 cho th\u1ea5y h\u1ec7 s\u1ee3i n\u1ea5m P. linteus <\/i>sinh tr\u01b0\u1edfng t\u1ed1t nh\u1ea5t khi c\u1ea5y tr\u00ean m\u00f4i tr\u01b0\u1eddng PDA (2,92mm\/ng\u00e0y) v\u00e0 PGA (2,71mm\/ng\u00e0y). S\u1ee3i n\u1ea5m sinh tr\u01b0\u1edfng t\u1ed1t nh\u1ea5t trong kho\u1ea3ng nhi\u1ec7t \u0111\u1ed9 t\u1eeb 20oC \u0111\u1ebfn 30oC v\u00e0 sinh tr\u01b0\u1edfng nhanh nh\u1ea5t \u1edf nhi\u1ec7t \u0111\u1ed9 25oC, \u0111\u1ea1t 2,34mm\/ng\u00e0y. N\u1ea5m Th\u01b0\u1ee3ng ho\u00e0ng sinh tr\u01b0\u1edfng t\u1ed1t khi \u0111\u01b0\u1ee3c nu\u00f4i \u1edf \u0111\u1ed9 \u1ea9m t\u1eeb 90% tr\u1edf l\u00ean, t\u1ed1t nh\u1ea5t l\u00e0 95%, t\u1ed1c \u0111\u1ed9 trung b\u00ecnh \u0111\u1ea1t 3,68mm\/ng\u00e0y. Th\u1eddi gian nu\u00f4i tr\u1ed3ng, t\u1eeb khi c\u1ea5y n\u1ea5m \u0111\u1ebfn khi thu ho\u1ea1ch th\u00edch h\u1ee3p l\u00e0 t\u1eeb 26 ng\u00e0y, kh\u1ed1i l\u01b0\u1ee3ng sinh kh\u1ed1i t\u01b0\u01a1i thu \u0111\u01b0\u1ee3c \u0111\u1ea1t 19,2g\/100ml m\u00f4i tr\u01b0\u1eddng.<\/p>\n

T\u1eeb kh\u00f3a: <\/i><\/b>\u0110\u1eb7c \u0111i\u1ec3m sinh h\u1ecdc, nu\u00f4i c\u1ea5y thu\u1ea7n khi\u1ebft, Phellinus linteus<\/i>, sinh tr\u01b0\u1edfng c\u1ee7a h\u1ec7 s\u1ee3i<\/p>\n

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Studies on the biological characteristics of Phellinus linteus <\/i>in pure culture <\/b><\/p>\n

Phellinus linteus <\/i>is a well – known Oriental medicinal fungus with a variety of biological activities, especially anti – tumor activities. This material is now widely collected in nature and as such has become extinct. Studies on the biological characteristics in pure culture are needed and the results can be used for fruiting body cultivation. Studies on the biological characteristics of Phellinus linteus <\/i>in pure culture were conducted with three kinds of nutrient media: PDA (potato dextrose agar), GYA (glucose and yeast extract) and PGA (potato glucose agar), six temperature treatments (10oC, 15oC, 20oC, 25oC, 30oC and 35oC), six relative humidity (RH) conditions (75%, 80%, 85%, 90%, 95% and 100%) and the time of havesting of mycelial mass production. The results showed that the fungal growth increment reached highest values when mycelia were cultivated in PDA (2.92 mm\/day) and PGA (2.71 mm\/day). Good growth of mycelia were recorded when cultures were cultivated in temperatures from 20 to 30oC and the best growth increment was in 25oC, at a rate of 2.34mm\/day. Mycelia grew well at a relative humidity over 90% and achieved an optimal rate of growth at 95% RH, growing 3.68 mm\/day. The time required for cultivation from mass mycelial production was approximately 26 days, achieving a mass of 19.2gm fresh mycelia per 100ml of media.<\/p>\n

Keywords: <\/i><\/b>Biological characteristics, mycelial growth, Phellinus linteus<\/i>, pure culture<\/p>\n

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THI\u00caN \u0110\u1ecaCH C\u1ee6A ONG \u0110EN (Leptocybe invasa<\/i>fisher & La Salle) G\u00c2Y U B\u01af\u1edaU B\u1ea0CH \u0110\u00c0N T\u1ea0I VI\u1ec6T NAM<\/b><\/p>\n

L\u00ea V\u0103n B\u00ecnh, Ph\u1ea1m Quang Thu <\/b><\/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<\/i><\/p>\n\n\n\n\n
T\u00d3M T\u1eaeT <\/b>Lo\u00e0i Ong \u0111en (Leptocybe invasa <\/i>Fisher & La Salle) thu\u1ed9c h\u1ecd (Eulophidae), b\u1ed9 C\u00e1nh m\u00e0ng (Hymenoptera) g\u00e2y h\u1ea1i b\u1ea1ch \u0111\u00e0n \u1edf nhi\u1ec1u n\u01b0\u1edbc tr\u00ean th\u1ebf gi\u1edbi. N\u0103m 2004 lo\u00e0i ong n\u00e0y \u0111\u01b0\u1ee3c ph\u00e1t hi\u1ec7n l\u1ea7n \u0111\u1ea7u \u1edf th\u00e0nh ph\u1ed1 H\u1ed3 Ch\u00ed Minh, \u0110\u1ed3ng Nai v\u00e0 \u0111\u1ebfn nay \u0111\u00e3 g\u00e2y h\u1ea1i v\u00e0 lan r\u1ed9ng ra kh\u1eafp 9 v\u00f9ng sinh th\u00e1i \u1edf Vi\u1ec7t Nam. N\u0103m 2013, k\u1ebft qu\u1ea3 \u0111i\u1ec1u tra t\u00ecnh h\u00ecnh g\u00e2y h\u1ea1i c\u1ee7a ong (L. invasa<\/i>) \u1edf \u0110\u00f4ng Tri\u1ec1u (Qu\u1ea3ng Ninh), Ph\u00f9 Ninh (Ph\u00fa Th\u1ecd) v\u00e0 Y\u00ean B\u00ecnh (Y\u00ean B\u00e1i) \u0111\u00e3 thu \u0111\u01b0\u1ee3c 4 lo\u00e0i thi\u00ean \u0111\u1ecbch lo\u00e0i ong n\u00e0y, trong \u0111\u00f3 c\u00f3 1 lo\u00e0i thu\u1ed9c nh\u00f3m thi\u00ean \u0111\u1ecbch b\u1eaft m\u1ed3i l\u00e0 lo\u00e0i Nh\u1ec7n linh mi\u00eau (Oxyopes <\/i>sp.) v\u00e0 3 lo\u00e0i thi\u00ean \u0111\u1ecbch k\u00fd sinh l\u00e0 lo\u00e0i Ong v\u00e0ng m\u1eaft n\u00e2u (Quadrastichus mendeli<\/i>), Ong n\u00e2u v\u00e0ng m\u1eaft \u0111\u1ecf (Aprostocetus <\/i>sp.) v\u00e0 lo\u00e0i Ong n\u00e2u c\u00e1nh ch\u1ea5m (Megastigmus <\/i>sp.). Trong 4 lo\u00e0i n\u00e0y c\u00f3 lo\u00e0i Ong v\u00e0ng m\u1eaft n\u00e2u l\u00e0 lo\u00e0i thi\u00ean \u0111\u1ecbch k\u00fd sinh l\u00ean Ong \u0111en (L. invasa<\/i>) r\u1ea5t ph\u1ed5 bi\u1ebfn, lo\u00e0i Ong n\u00e2u v\u00e0ng m\u1eaft \u0111\u1ecf k\u00fd sinh ph\u1ed5 bi\u1ebfn, lo\u00e0i Ong n\u00e2u c\u00e1nh ch\u1ea5m v\u00e0 lo\u00e0i Thi\u00ean \u0111\u1ecbch b\u1eaft m\u1ed3i Nh\u1ec7n linh mi\u00eau l\u00e0 \u00edt b\u1ed5 bi\u1ebfn.<\/p>\n

T\u1eeb kh\u00f3a: <\/i><\/b>B\u1ea1ch \u0111\u00e0n, h\u00ecnh th\u00e1i, Leptocybe invasa, <\/i>thi\u00ean \u0111\u1ecbch<\/p>\n

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Detecting natural enemies of Letocybe invasa <\/i>Fisher & La Salle species gall wasp in Vietnam <\/b><\/p>\n

Leptocybe invasa <\/i>belongs to family Eulophidae, order Hymenoptera. This species is currently causing damage to eucalyptus in many countries around the world and has been reported damaging eucalyptus in Ho Chi Minh City, \u0110ong Nai and Binh Phuoc province of Vietnam since 2004, up to now they have damaged and distributed across nine eco – regions in Vietnam. In 2015, according to investigation data about L. invasa <\/i>in Dong Trieu (Quang Ninh), Phu Ninh (Phu Tho) and Yen Binh (Yen Bai), 4 species natural enemies were collected, including one species (Oxyopes <\/i>sp.) belongs to predator group and three species were parasitic predators including Quadrastichus mendeli<\/i>; Aprostocetus <\/i>sp. and Megastigmus <\/i>sp. Among these species, Quadrastichus mendeli <\/i>is a very popurlar parasite on L<\/i>. invasa<\/i>; Aprostocetus <\/i>sp. is popular and two species Megastigmus <\/i>sp. and Oxyopes <\/i>sp. are less popular.<\/p>\n

Keywords: <\/i><\/b>Eucalyptus, morphology, Leptocybe invasa<\/i>, natural enemies<\/p>\n

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S\u00c2U \u0110O (Biston suppressaria <\/i>Guen\u00e9e) – M\u1ed0I \u0110E D\u1eccA M\u1edaI CHO R\u1eeaNG TR\u1ed2NG KEO TAI T\u01af\u1ee2NG (Acacia mangium<\/i>) T\u1ea0I VI\u1ec6T NAM<\/b><\/p>\n

L\u00ea V\u0103n B\u00ecnh, Ph\u1ea1m Quang Thu <\/b><\/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<\/i><\/p>\n\n\n\n\n
T\u00d3M T\u1eaeT <\/b>S\u00e2u \u0111o (Biston suppressaria<\/i>) thu\u1ed9c h\u1ecd S\u00e2u \u0111o (Geometridae), b\u1ed9 C\u00e1nh v\u1ea3y (Lepidoptera), l\u00e0 lo\u00e0i c\u00f4n tr\u00f9ng \u0103n l\u00e1 v\u00e0 g\u00e2y h\u1ea1i ch\u00ednh \u0111\u1ed1i v\u1edbi nhi\u1ec1u lo\u00e0i c\u00e2y: Ch\u00e8 (Camellia sinensis<\/i>), c\u00e1c lo\u00e0i b\u1ea1ch \u0111\u00e0n (Eucalyptus <\/i>spp.), Cao su (Hevea brasillensis<\/i>), Tr\u1ea9u (Aleurities montana<\/i>), <\/i>S\u0103ng l\u1ebb (Lagerstroemia indica<\/i>) v\u00e0 m\u1ed9t s\u1ed1 lo\u00e0i c\u00e2y thu\u1ed9c h\u1ecd \u0110\u1eadu (Fabaceae). T\u1eeb nh\u1eefng n\u0103m 1963, t\u1ea1i Vi\u1ec7t Nam, lo\u00e0i s\u00e2u n\u00e0y \u0111\u00e3 g\u00e2y d\u1ecbch h\u1ea1i r\u1eebng Lim xanh (Erythrophleum fordii<\/i>) \u1edf L\u1ea1ng S\u01a1n, Qu\u1ea3ng Ninh, Ph\u00fa Th\u1ecd, V\u0129nh Ph\u00fac, Thanh H\u00f3a v\u00e0 Ngh\u1ec7 An. Do di\u1ec7n t\u00edch r\u1eebng tr\u1ed3ng Keo tai t\u01b0\u1ee3ng t\u0103ng cao tr\u00ean to\u00e0n qu\u1ed1c, S\u00e2u \u0111o (B. suppressaria<\/i>) \u0111\u00e3 thay \u0111\u1ed5i t\u1eadp t\u00ednh v\u00e0 chuy\u1ec3n sang s\u1eed d\u1ee5ng l\u00e1 Keo tai t\u01b0\u1ee3ng l\u00e0m th\u1ee9c \u0103n. N\u0103m 2014, l\u1ea7n \u0111\u1ea7u ti\u00ean ghi nh\u1eadn d\u1ecbch S\u00e2u \u0111o \u0111\u00e3 ph\u00e1t sinh, g\u00e2y h\u1ea1i r\u1eebng tr\u1ed3ng Keo tai t\u01b0\u1ee3ng t\u1ea1i Ti\u00ean Y\u00ean v\u00e0 Ba Ch\u1ebd, t\u1ec9nh Qu\u1ea3ng Ninh, v\u00e0 \u0111\u00e3 g\u00e2y thi\u1ec7t h\u1ea1i n\u1eb7ng. K\u1ebft qu\u1ea3 \u0111i\u1ec1u tra cho th\u1ea5y t\u1ef7 l\u1ec7 b\u1ecb h\u1ea1i t\u1eeb 13,6% (th\u00e1ng 9) \u0111\u1ebfn 53,8% (th\u00e1ng 6) v\u00e0 ch\u1ec9 s\u1ed1 b\u1ecb h\u1ea1i t\u1eeb 0,11 (th\u00e1ng 12) \u0111\u1ebfn 2,18 (th\u00e1ng 6). Tr\u01b0\u1edfng th\u00e0nh c\u00f3 m\u00e0u tr\u1eafng x\u00e1m, con \u0111\u1ef1c th\u01b0\u1eddng nh\u1ecf h\u01a1n con c\u00e1i, r\u00e2u \u0111\u1ea7u con c\u00e1i h\u00ecnh s\u1ee3i ch\u1ec9, r\u00e2u \u0111\u1ea7u con \u0111\u1ef1c h\u00ecnh r\u0103ng l\u01b0\u1ee3c k\u00e9p. Tr\u01b0\u1edfng th\u00e0nh \u0111\u1ef1c s\u1ea3i c\u00e1nh r\u1ed9ng 40 – 50mm, tr\u01b0\u1edfng th\u00e0nh c\u00e1i s\u1ea3i c\u00e1nh r\u1ed9ng 60 – 70mm. Nh\u1ed9ng m\u00e0u n\u00e2u \u0111en d\u00e0i 20 – 23mm, r\u1ed9ng 9mm. S\u00e2u non tu\u1ed5i 5 c\u00f3 m\u00e0u n\u00e2u x\u00e1m d\u00e0i 50 – 62mm.<\/p>\n

T\u1eeb kh\u00f3a: <\/i><\/b>Biston suppressaria<\/i>, h\u1ea1i l\u00e1, Keo tai t\u01b0\u1ee3ng, Lim xanh, S\u00e2u \u0111o<\/p>\n

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Looper caterpillar Biston suppressaria <\/i>guen\u00e9e – a new emerging threat to Acacia mangium <\/i>plantations in Vietnam <\/b><\/p>\n

The looper caterpillar, Biston suppressaria <\/i>Guen. is a major defoliating pest in many countries. It belongs to the Family Geometridae, Order Lepidoptera. It is a destructive and major defoliating pest of Camellia sinensis<\/i>, Eucalyptus <\/i>spp., Hevea brasiliensis<\/i>, Aleurities montana, Lagerstroemia indica, <\/i>and several species of Fabaceae. Since 1963, in Vietnam, this pest has caused many outbreaks to Erythrophleum fordii <\/i>in Lang Son, Quang Ninh, Phu Tho, Vinh Phuc, Thanh Hoa and Nghe An provinces. As the area of A. mangium <\/i>plantations has increased across the country, the looper carterpillar B. suppressaria <\/i>has adapted to using A. mangium <\/i>leaves as a source of food. Since 2014, this looper caterpillar has caused its first outbreak on A. mangium <\/i>plantations in Tien Yen and Ba Che districts, Quang Ninh province, causing heavy losses for the plantations. The incidence of damage was assessed at between 13.6 (September) to 53.8% (June) and the damage index ranged from 0.11 (December) to 2.18 (June). The adult moths are grey. The males are in general smaller than the females and are easily distinguished by the antennae, which are bipectinated. The wing span of the male is 40 – 50mm, whereas the female is larger at 60 – 70mm. The last instar are brownish – grey in colour and range in length from 50 – 62mm at the 5th instar. Pupae are blackish brown, 20 – 23mm in lenght, and approximately 9mm in wide.<\/p>\n

Keywords: <\/i><\/b>Acacia mangium, Biston suppressaria, defoliator, Erythrophleum fordii, <\/i>looper caterpillar<\/p>\n

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\u0110I\u1ec0U TRA TH\u00c0NH PH\u1ea6N LO\u00c0I N\u1ea4M G\u00c2Y B\u1ec6NH TH\u1ed0I R\u1ec4 THU\u1ed8C H\u1ecc PYTHIACEAE G\u00c2Y H\u1ea0I KEO TAI T\u01af\u1ee2NG V\u00c0 KEO LAI \u1ede C\u00c1C T\u1ec8NH MI\u1ec0N B\u1eaeC VI\u1ec6T NAM<\/b><\/p>\n

Ph\u1ea1m Quang Thu <\/b><\/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<\/i><\/p>\n\n\n\n\n
T\u00d3M T\u1eaeT <\/b>Phytophthora <\/i>spp. v\u00e0 Pythium <\/i>spp. l\u00e0 nh\u1eefng lo\u00e0i n\u1ea5m g\u00e2y thi\u1ec7t h\u1ea1i nh\u1ea5t cho nhi\u1ec1u lo\u1ea1i c\u00e2y tr\u1ed3ng n\u00f4ng l\u00e2m nghi\u1ec7p tr\u00ean ph\u1ea1m vi to\u00e0n th\u1ebf gi\u1edbi. Hi\u1ec7n nay, c\u00f3 h\u01a1n 80 lo\u00e0i Phytophthora <\/i>v\u00e0 h\u01a1n 120 lo\u00e0i Pythium <\/i>tr\u00ean th\u1ebf gi\u1edbi \u0111\u00e3 \u0111\u01b0\u1ee3c m\u00f4 t\u1ea3 v\u00e0 ph\u1ea7n l\u1edbn l\u00e0 nh\u1eefng t\u00e1c nh\u00e2n g\u00e2y b\u1ec7nh. T\u1eeb 16 m\u1eabu \u0111\u1ea5t c\u1ee7a r\u1eebng tr\u1ed3ng v\u00e0 v\u01b0\u1eddn \u01b0\u01a1m Keo tai t\u01b0\u1ee3ng v\u00e0 keo lai \u0111\u00e3 ph\u00e2n l\u1eadp v\u00e0 gi\u00e1m \u0111\u1ecbnh \u0111\u01b0\u1ee3c 16 ch\u1ee7ng, thu\u1ed9c 12 lo\u00e0i n\u1ea5m thu\u1ed9c h\u1ecd Pythiaceae, trong \u0111\u00f3 c\u00f3 7 lo\u00e0i m\u1edbi cho khu h\u1ec7 n\u1ea5m c\u1ee7a Vi\u1ec7t Nam, \u0111\u00f3 l\u00e0 c\u00e1c lo\u00e0i: Pythium helicoides<\/i>, Pythium dissotocum<\/i>, Pythium vexans<\/i>, Pythium cucurbitacearum<\/i>, Pythium graminicola<\/i>, Phytopythium helicoides <\/i>v\u00e0 Phytophthora katsurae<\/i>. Qua th\u00ed nghi\u1ec7m g\u00e2y b\u1ec7nh nh\u00e2n t\u1ea1o, c\u00e1c lo\u00e0i n\u1ea5m n\u00e0y \u0111\u1ec1u c\u00f3 kh\u1ea3 n\u0103ng g\u00e2y b\u1ec7nh cho Keo tai t\u01b0\u1ee3ng v\u00e0 keo lai \u1edf c\u00e1c m\u1ee9c \u0111\u1ed9 kh\u00e1c nhau t\u1eeb g\u00e2y b\u1ec7nh r\u1ea5t m\u1ea1nh \u0111\u1ebfn g\u00e2y b\u1ec7nh y\u1ebfu. C\u00e1c ch\u1ee7ng n\u1ea5m VTN04, VTN06 c\u1ee7a lo\u00e0i Pythium helicoides<\/i>, ch\u1ee7ng VTN15 lo\u00e0i Pythium dissotocum <\/i>v\u00e0 ch\u1ee7ng VTN24 c\u1ee7a lo\u00e0i Phytopythium helicoides <\/i>c\u00f3 kh\u1ea3 n\u0103ng g\u00e2y b\u1ec7nh r\u1ea5t m\u1ea1nh cho c\u1ea3 Keo tai t\u01b0\u1ee3ng v\u00e0 keo lai. <\/i>C\u00e1c ch\u1ee7ng n\u1ea5m VTN13, VTN22 c\u1ee7a lo\u00e0i Pythium graminicola, <\/i>ch\u1ee7ng VTN20 thu\u1ed9c lo\u00e0i Pythium <\/i>sp. v\u00e0 ch\u1ee7ng VTN09 thu\u1ed9c n\u1ea5m Phytophthora katsurae <\/i>g\u00e2y b\u1ec7nh y\u1ebfu \u0111\u1ed1i v\u1edbi Keo tai t\u01b0\u1ee3ng v\u00e0 keo lai.<\/p>\n

T\u1eeb kh\u00f3a: <\/i><\/b>Keo tai t\u01b0\u1ee3ng, keo lai, Pythium<\/i>, Phytophthora<\/i>, Phytopythium<\/i>, t\u00ednh g\u00e2y b\u1ec7nh<\/p>\n

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Surveys of pythiaceae causing root rot diseases of Acacia mangium <\/i>and Acacia hybrid in some provinces of North Vietnam <\/b><\/p>\n

Phytophthora <\/i>species are among the most destructive pathogens of agricultural crops and forests in the world. There are currently more than 80 and 120 described species of Phytophthora <\/i>and Pythium <\/i>(Pythiaceae) worldwide respectively, and the vast majority are plant pathogens. Laboratory analysis of 16 soil and diseased roots specimens from Acacia mangium <\/i>and Acacia hybrid plantations and nurseries, resulted in the recovery and identification of 16 isolates belonging to 12 Pythiaceous <\/i>species. Seven of these species are new records for Vietnam including: Pythium helicoides<\/i>, Pythium dissotocum<\/i>, Pythium vexans<\/i>, Pythium cucurbitacearum, Pythium graminicola<\/i>, Phytopythium helicoides <\/i>and Phytophthora katsurae. <\/i>Pathogenicity of the strains varied from very strong to weak based upon artificial inoculation testing. Strains VTN04 and VTN06 belonging to Pythium helicoides<\/i>, strain VTN15 belonging to Pythium dissotocum <\/i>and VTN24 of Phytopythium helicoides <\/i>were very strongly pathogenic to Acacia mangium <\/i>and Acacia hybrid. Strains VTN13 and VTN22 of Pythium graminicola, <\/i>VTN20 of Pythium <\/i>sp. and VTN09 of Phytophthora katsurae <\/i>were weakly pathogenic to both Acacia mangium <\/i>and Acacia hybrid.<\/p>\n

Keywords: <\/i><\/b>Acacia mangium<\/i>, Acacia hybrid, pathogenicity, Phytophthora, Phytopythium, <\/i>Pythium<\/p>\n

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K\u1ebeT QU\u1ea2 NGHI\u00caN C\u1ee8U TH\u00c0NH PH\u1ea6N S\u00c2U, B\u1ec6NH H\u1ea0I M\u1ed8T S\u1ed0 LO\u00c0I C\u00c2Y TR\u1ed2NG R\u1eeaNG CH\u00cdNH T\u1ea0I VI\u1ec6T NAM<\/b><\/p>\n

Ph\u1ea1m Quang Thu <\/b><\/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<\/i><\/p>\n\n\n\n\n\n\n
T\u00d3M T\u1eaeT <\/b>\u0110i\u1ec1u tra th\u00e0nh ph\u1ea7n s\u00e2u, b\u1ec7nh h\u1ea1i 17 lo\u00e0i c\u00e2y tr\u1ed3ng r\u1eebng ch\u00ednh trong s\u1ea3n xu\u1ea5t l\u00e2m nghi\u1ec7p bao g\u1ed3m: Keo l\u00e1 tr\u00e0m, keo lai, Keo tai t\u01b0\u1ee3ng, Phi lao, Qu\u1ebf, Lu\u1ed3ng, D\u1ea7u r\u00e1i, B\u1ea1ch \u0111\u00e0n camal, b\u1ea1ch \u0111\u00e0n lai, B\u1ea1ch \u0111\u00e0n ur\u00f4, Cao su, Sao \u0111en, Th\u00f4ng carib\u00ea, Th\u00f4ng m\u00e3 v\u0129, Th\u00f4ng nh\u1ef1a, Th\u00f4ng ba l\u00e1 v\u00e0 B\u1ed3 \u0111\u1ec1 \u0111\u01b0\u1ee3c ti\u1ebfn h\u00e0nh \u1edf 9 v\u00f9ng sinh th\u00e1i trong giai \u0111o\u1ea1n 2012 \u0111\u1ebfn 2015. K\u1ebft qu\u1ea3 \u0111\u00e3 ghi nh\u1eadn 328 lo\u00e0i c\u00f4n tr\u00f9ng v\u00e0 132 lo\u00e0i sinh v\u1eadt g\u00e2y b\u1ec7nh, trong \u0111\u00f3 c\u00f3 2 lo\u00e0i m\u1edbi cho khoa h\u1ecdc l\u00e0 n\u1ea5m Calonectria quiqueseptata <\/i>v\u00e0 tuy\u1ebfn tr\u00f9ng Bursaphelenchus kesiyae <\/i>g\u00e2y b\u1ec7nh cho b\u1ea1ch \u0111\u00e0n v\u00e0 th\u00f4ng, 40 lo\u00e0i m\u1edbi cho khu h\u1ec7. \u0110\u00e3 x\u00e1c \u0111\u1ecbnh \u0111\u01b0\u1ee3c c\u00e1c lo\u00e0i s\u00e2u, b\u1ec7nh h\u1ea1i ch\u00ednh \u0111\u1ed1i v\u1edbi t\u1eebng lo\u00e0i c\u00e2y tr\u1ed3ng. Di\u1ec7n t\u00edch r\u1eebng tr\u1ed3ng c\u00e1c lo\u00e0i keo l\u00e0 l\u1edbn nh\u1ea5t, chi\u1ebfm kho\u1ea3ng 1,3 tri\u1ec7u ha hi\u1ec7n nay \u0111ang b\u1ecb B\u1ec7nh ch\u1ebft h\u00e9o do n\u1ea5m Ceratocystis manginecans <\/i>v\u00e0 M\u1ecdt nu\u00f4i n\u1ea5m forni (Euwallacea fornicatus<\/i>) l\u00e0 nh\u1eefng lo\u00e0i g\u00e2y h\u1ea1i ch\u00ednh v\u00e0 g\u00e2y h\u1ea1i nghi\u00eam tr\u1ecdng tr\u00ean nhi\u1ec1u v\u00f9ng sinh th\u00e1i trong c\u1ea3 n\u01b0\u1edbc. Di\u1ec7n t\u00edch l\u1edbn th\u1ee9 2 l\u00e0 r\u1eebng tr\u1ed3ng b\u1ea1ch \u0111\u00e0n, v\u1edbi kho\u1ea3ng 350.000ha, lo\u00e0i Ong g\u00e2y u b\u01b0\u1edbu ng\u1ecdn v\u00e0 g\u00e2n l\u00e1 b\u1ea1ch \u0111\u00e0n l\u00e0 lo\u00e0i s\u00e2u g\u00e2y h\u1ea1i ch\u00ednh v\u00e0 B\u1ec7nh ch\u00e1y l\u00e1 do n\u1ea5m Calonectria quiqueseptata <\/i>v\u00e0 B\u1ec7nh \u0111\u1ed1m l\u00e1 do n\u1ea5m Cryptosporiopsis eucalypti <\/i>l\u00e0 hai b\u1ec7nh nguy hi\u1ec3m cho b\u1ea1ch \u0111\u00e0n. Di\u1ec7n t\u00edch r\u1eebng tr\u1ed3ng l\u1edbn th\u1ee9 3 l\u00e0 c\u00e1c lo\u00e0i th\u00f4ng, kho\u1ea3ng 300.000ha, S\u00e2u r\u00f3m th\u00f4ng (Dendrolimus punctatus<\/i>) v\u00e0 S\u00e2u r\u00f3m 4 t\u00fam l\u00f4ng (Dasychira auxutha<\/i>) l\u00e0 2 lo\u00e0i s\u00e2u h\u1ea1i nguy hi\u1ec3m v\u00e0 th\u01b0\u1eddng g\u00e2y d\u1ecbch tr\u00ean di\u1ec7n r\u1ed9ng c\u1ee9 2 ho\u1eb7c 3 n\u0103m xu\u1ea5t hi\u1ec7n 1 l\u1ea7n.<\/p>\n

T\u1eeb kh\u00f3a: <\/i><\/b>B\u1ec7nh h\u1ea1i, s\u00e2u h\u1ea1i, r\u1eebng tr\u1ed3ng, lo\u00e0i h\u1ea1i ch\u00ednh<\/p>\n

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Results of a survey of insect pests and diseases of the main forest plantation species in Vietnam <\/b><\/p>\n

Surveillance of insect pests and diseases of 17 forest tree species including Acacia auriculiformis, Acacia hybrids, A. mangium, Casuarina equisetifolia, Cinnamomum cassia, Dendrocalamus barbatus, Diptercarpus alatus, Eucalyptus camaldulensis, Eucalyptus hybrids, Eucalyptus urophylla, Hevea brasilliensis, Hopea odorata, Pinus caribeae, Pinus kesyia, Pinus massoniana, Pinus merkusii, <\/i>and Styrax tonkinensis <\/i>was conducted across nine ecological zones in Vietnam from 2012 to 2015. Three hundred and twenty eight species of insect pests and one hundred and thirty two pathogens were identified. Two species Calonectria quiqueseptata <\/i>and Bursaphelenchus kesiyae <\/i>causing diseases of eucalypts and Pinus kesyia<\/i>, respectively were new descriptions and 40 species of insect pests and pathogens were new reports for Vietnamese fauna and microflora. The survey listed a number of major pest and disease problems across the 17 tree species surveyed. Acacia plantations make up the biggest area with about 1.3 million ha and suffer serious problems with Ceratocystis wilt disease caused by Ceratocystis manginecans <\/i>and the polyphagous shot hole borer Euwallacea fornicatus<\/i>. The second biggest plantation area is eucalypts making up about 350,000ha. The main problems are gall wasp (Leptocybe invasa<\/i>) causing galls on young shoots and ribs of the leaves and leaf blight disease caused by Calonectria quinqueseptata<\/i>, and leaf spot disease caused by Cryptosporiopsis eucalypti<\/i>. The third biggest plantation area is pine making up 300,00ha, two kinds of needle eating caterpillar Dendrolimus punctatus <\/i>and Dasychira axutha <\/i>are serious pests for pine plantations and cause large scale outbreaks every two or three years.<\/p>\n

Keywords: <\/i><\/b>Diseases, forest plantation, insect pests, major pests<\/p>\n

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T\u00cdNH \u0110A D\u1ea0NG V\u00c0 GI\u00c1 TR\u1eca B\u1ea2O T\u1ed2N KHU H\u1ec6 TH\u00da (Mammalia fauna) T\u1ea0I V\u01af\u1edcN QU\u1ed0C GIA BA B\u1ec2, T\u1ec8NH B\u1eaeC K\u1ea0N<\/b><\/p>\n

\u0110\u1ed3ng Thanh H\u1ea3i <\/b><\/p>\n

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

T\u00d3M T\u1eaeT V\u01b0\u1eddn qu\u1ed1c gia Ba B\u1ec3 l\u00e0 m\u1ed9t trong b\u1ed1n V\u01b0\u1eddn qu\u1ed1c gia \u1edf n\u01b0\u1edbc ta \u0111\u01b0\u1ee3c c\u00f4ng nh\u1eadn Di s\u1ea3n c\u1ee7a ASEAN. V\u01b0\u1eddn c\u00f3 t\u00ednh \u0111a d\u1ea1ng cao v\u1ec1 c\u00e1c h\u1ec7 sinh th\u00e1i r\u1eebng, v\u00e0 c\u00e1c lo\u00e0i \u0111\u1ed9ng th\u1ef1c v\u1eadt. Tuy nhi\u00ean, cho \u0111\u1ebfn nay s\u1ef1 bi\u1ebfn \u0111\u1ed9ng v\u1ec1 th\u00e0nh ph\u1ea7n, s\u1ed1 l\u01b0\u1ee3ng lo\u00e0i, c\u00e1c m\u1ed1i \u0111e d\u1ecda \u0111\u1ed1i v\u1edbi lo\u00e0i v\u00e0 sinh c\u1ea3nh \u1edf \u0111\u00e2y ch\u01b0a \u0111\u01b0\u1ee3c c\u1eadp nh\u1eadt. M\u1ee5c ti\u00eau c\u1ee7a nghi\u00ean c\u1ee9u n\u00e0y l\u00e0 x\u00e1c \u0111\u1ecbnh t\u00ednh \u0111a d\u1ea1ng th\u00e0nh ph\u1ea7n lo\u00e0i th\u00fa, \u0111\u1eb7c bi\u1ec7t s\u1ef1 c\u00f3 m\u1eb7t c\u1ee7a c\u00e1c lo\u00e0i th\u00fa, gi\u00e1 tr\u1ecb b\u1ea3o t\u1ed3n c\u1ee7a lo\u00e0i v\u00e0 c\u00e1c m\u1ed1i \u0111e d\u1ecda \u0111\u1ebfn lo\u00e0i v\u00e0 sinh c\u1ea3nh. Ph\u01b0\u01a1ng ph\u00e1p ph\u1ecfng v\u1ea5n, \u0111i\u1ec1u tra theo tuy\u1ebfn, b\u1eaby l\u1ed3ng, l\u01b0\u1edbi m\u1edd \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 thu th\u1eadp s\u1ed1 li\u1ec7u. K\u1ebft qu\u1ea3 \u0111i\u1ec1u tra ghi nh\u1eadn \u0111\u01b0\u1ee3c 66 lo\u00e0i th\u00fa thu\u1ed9c 25 h\u1ecd, 8 b\u1ed9. Trong \u0111\u00f3, c\u00f3 28 (chi\u1ebfm 42,42% t\u1ed5ng s\u1ed1 c\u00e1c lo\u00e0i ghi nh\u1eadn \u0111\u01b0\u1ee3c) lo\u00e0i th\u00fa \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh quan tr\u1ecdng \u01b0u ti\u00ean cho c\u00f4ng t\u00e1c b\u1ea3o t\u1ed3n. S\u0103n b\u1eaft v\u00e0 ph\u00e1 h\u1ee7y sinh c\u1ea3nh l\u00e0 hai m\u1ed1i \u0111e d\u1ecda ch\u00ednh \u0111\u1ebfn khu h\u1ec7 th\u00fa t\u1ea1i V\u01b0\u1eddn qu\u1ed1c gia. B\u1ed1n gi\u1ea3i ph\u00e1p ch\u00ednh nh\u1eb1m n\u00e2ng cao hi\u1ec7u qu\u1ea3 qu\u1ea3n l\u00fd b\u1ea3o t\u1ed3n khu h\u1ec7 th\u00fa bao g\u1ed3m: B\u1ea3o v\u1ec7 lo\u00e0i, sinh c\u1ea3nh v\u00e0 gi\u00e1m s\u00e1t, \u0111\u00e1nh gi\u00e1 c\u00e1c lo\u00e0i th\u00fa, n\u00e2ng cao nh\u1eadn th\u1ee9c v\u00e0 c\u1ea3i thi\u1ec7n sinh k\u1ebf cho c\u1ed9ng \u0111\u1ed3ng.<\/p>\n

T\u1eeb kh\u00f3a: <\/i><\/b>\u0110a d\u1ea1ng, th\u00e0nh ph\u1ea7n lo\u00e0i th\u00fa, gi\u00e1 tr\u1ecb b\u1ea3o t\u1ed3n, Ba B\u1ec3, B\u1eafc K\u1ea1n<\/p>\n

 <\/p>\n

\u00a0<\/b><\/td>\n<\/tr>\n

Diversity and conservation values of mammalia fauna in Ba Be National Park, Bac Kan province <\/b><\/p>\n

Ba Be National Park, one of 4 national parks in our country, has been recognized as ASEAN Heritage. The park has a high diversity of forest ecosystems, and the plant and animal species. However, there has been no update on the changes in composition, number of species, the threats to the species and habitats. The objectives of this study were to determine the diversity of species of mammals, especially in the presence of the mammals, the conservation values of the species and the threats to the species and habitats. Interviewing, linetrasects, traps, mist nets were used to to collect data in the field. The surveys were recorded 66 species of mammals belonging to 25 families, 8 orders. Of these, 28 (accounting for 42.42% of the recorded species), mammals were identified important priorities for conservation. Hunting and habitat destruction are the 2 major threats to the fauna of the national park. Four main solutions were recommended to improve the efficiency of conservation management of mammal species including species and habitat protection, mammal monitoring and evaluation, raising awareness and livelihood improvement for local communities.<\/p>\n

Keywords: <\/i><\/b>Diversity, species composition, conservation values, Ba Be, Bac Kan<\/p>\n

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

C\u00c1C CH\u1ea4T CHI\u1ebeT XU\u1ea4T T\u1eea L\u00c1 C\u00c2Y KEO LAI (Acacia hybrids<\/i>)<\/b><\/p>\n

Nguy\u1ec5n Th\u1ecb Minh Nguy\u1ec7t <\/b><\/p>\n

Vi\u1ec7n C\u00f4ng nghi\u1ec7p g\u1ed7, Tr\u01b0\u1eddng \u0110\u1ea1i h\u1ecdc L\u00e2m nghi\u1ec7p<\/i><\/p>\n\n\n\n\n
T\u00d3M T\u1eaeT <\/b>B\u00e0i b\u00e1o tr\u00ecnh b\u00e0y c\u00e1c k\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u b\u01b0\u1edbc \u0111\u1ea7u thu nh\u1eadn c\u00e1c ch\u1ea5t chi\u1ebft xu\u1ea5t t\u1eeb l\u00e1 c\u00e2y keo lai b\u1eb1ng c\u00e1c dung m\u00f4i kh\u00e1c nhau. H\u00e0m l\u01b0\u1ee3ng ch\u1ea5t chi\u1ebft xu\u1ea5t trong n\u01b0\u1edbc n\u00f3ng, n\u01b0\u1edbc l\u1ea1nh t\u01b0\u01a1ng \u1ee9ng l\u00e0 15,7% v\u00e0 6,9%, ch\u1ea5t chi\u1ebft xu\u1ea5t trong acetone kho\u1ea3ng 4,8%, trong etano l\u00e0 15,67%, trong ete d\u1ea7u h\u1ecfa v\u00e0 dietylete t\u01b0\u01a1ng \u1ee9ng l\u00e0 5,3% v\u00e0 4,6%. B\u01b0\u1edbc \u0111\u1ea7u th\u1eed nghi\u1ec7m s\u1ef1 ph\u00f9 h\u1ee3p c\u1ee7a qu\u00e1 tr\u00ecnh chi\u1ebft xu\u1ea5t trong acetone v\u00e0 ete d\u1ea7u h\u1ecfa. Sau khi chi\u1ebft t\u00e1ch, c\u00e1c ch\u1ea5t chi\u1ebft xu\u1ea5t \u0111\u01b0\u1ee3c h\u00f2a tan trong dung m\u00f4i ete d\u1ea7u h\u1ecfa theo qu\u00e1 tr\u00ecnh chi\u1ebft ph\u00e2n b\u1ed5. Hi\u1ec7u su\u1ea5t m\u1ed9t s\u1ed1 s\u1ea3n ph\u1ea9m nh\u01b0 c\u00e1c axit h\u1eefu c\u01a1, c\u00e1c ch\u1ea5t trung t\u00ednh v\u00e0 ch\u1ea5t di\u1ec7p l\u1ee5c c\u00f3 s\u1ef1 thay \u0111\u1ed5i \u0111\u00e1ng k\u1ec3. Hi\u1ec7u su\u1ea5t axit h\u1eefu c\u01a1 \u0111\u1ea1t t\u1eeb 0,61 \u0111\u1ebfn 1,82%, c\u00e1c ch\u1ea5t trung t\u00ednh: t\u1eeb 2,13 \u0111\u1ebfn 5,43% v\u00e0 natri clorophyl \u0111\u1ea1t 0,16 \u0111\u1ebfn 0,23% so v\u1edbi kh\u1ed1i l\u01b0\u1ee3ng l\u00e1 kh\u00f4. Ph\u1ed5 UV – VIS c\u1ee7a natri clorophyl, th\u00e0nh ph\u1ea7n c\u01a1 b\u1ea3n c\u1ee7a c\u00e1c axit h\u1eefu c\u01a1 v\u00e0 c\u00e1c ch\u1ea5t trung t\u00ednh \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh. C\u00e1c k\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u l\u00e0 c\u01a1 s\u1edf cho vi\u1ec7c nghi\u00ean c\u1ee9u s\u1eed d\u1ee5ng c\u00e1c s\u1ea3n ph\u1ea9m t\u1eeb l\u00e1 c\u00e2y keo lai Acacia hybrids. <\/i><\/p>\n

T\u1eeb kh\u00f3a: <\/i><\/b>Axit h\u1eefu c\u01a1, acetone, ch\u1ea5t chi\u1ebft xu\u1ea5t, ch\u1ea5t trung t\u00ednh, keo lai<\/p>\n

 <\/td>\n<\/tr>\n

The extractives from leaves of Acacia hybrid <\/i><\/b><\/p>\n

This paper presents the results of the preliminary studies of extractives from leaves of Acacia hybrid. <\/i>Some chemical compositions of the leaves have been identified, the method of extraction in petroleum ether and acetone has been applied, several methods for improving the extraction effectiveness were studied. After separation of the extractives dissolved in petroleum ether, some target products were quantified such as organic acids, neutral substances and sodium chlorophyll. Organic acids of up 0.61 to 1.82%, neutral substances of up 2.13 to 5.43 and sodium chlorophyll of up 0.16 to 0.23% of dry leaves weight were obtained. An UV – VIS spectrum of sodium chlorophyll wasused for identifying the preliminary composition of organic acids and neutral substances. Analysis of leaves powder extracted by petroleum ether showed that the crude fiber content and nutritional contents were comparable with some kind of animal feed additives, such as sweet potato leaves, soybean stems and banana stalks. The research results are the base for the further study of the utilization of natural products from acacia leaves.<\/p>\n

Keywords: <\/i><\/b>Acacia hybrid<\/i>, extractives, neutral substances, organic acids<\/p>\n

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

\u1ea2NH H\u01af\u1edeNG C\u1ee6A X\u1eec L\u00dd NHI\u1ec6T \u0110\u1ebeN M\u1ed8T S\u1ed0 T\u00cdNH CH\u1ea4T C\u01a0 H\u1eccC G\u1ed6 KEO LAI<\/b><\/p>\n

Nguy\u1ec5n Th\u1ecb Minh Nguy\u1ec7t<\/b>*<\/b>, V\u0169 M\u1ea1nh T\u01b0\u1eddng <\/b><\/p>\n

Vi\u1ec7n C\u00f4ng nghi\u1ec7p g\u1ed7, Tr\u01b0\u1eddng \u0110\u1ea1i h\u1ecdc L\u00e2m nghi\u1ec7p<\/i><\/p>\n\n\n\n\n
T\u00d3M T\u1eaeT <\/b>C\u00f4ng ngh\u1ec7 x\u1eed l\u00fd g\u1ed7 b\u1eb1ng nhi\u1ec7t \u0111\u1ed9 cao l\u00e0 c\u00f4ng ngh\u1ec7 th\u00e2n thi\u1ec7n v\u1edbi m\u00f4i tr\u01b0\u1eddng v\u00e0 ph\u00f9 h\u1ee3p trong vi\u1ec7c c\u1ea3i thi\u1ec7n ch\u1ea5t l\u01b0\u1ee3ng g\u1ed7. Tuy nhi\u00ean, trong m\u1ed9t s\u1ed1 tr\u01b0\u1eddng h\u1ee3p g\u1ed7 x\u1eed l\u00fd nhi\u1ec7t l\u1ea1i c\u00f3 t\u00ednh ch\u1ea5t c\u01a1 h\u1ecdc th\u1ea5p h\u01a1n so v\u1edbi g\u1ed7 kh\u00f4ng x\u1eed l\u00fd. Nghi\u00ean c\u1ee9u n\u00e0y \u0111\u00e3 ti\u1ebfn h\u00e0nh x\u1eed l\u00fd g\u1ed7 keo lai \u1edf nhi\u1ec7t \u0111\u1ed9 t\u1eeb 210oC \u0111\u1ebfn 230oC trong \u0111i\u1ec1u ki\u1ec7n m\u00f4i tr\u01b0\u1eddng c\u00f3 kh\u00ed ni t\u01a1 (N2) b\u1ea3o v\u1ec7 trong th\u1eddi gian t\u1eeb 2h \u0111\u1ebfn 6h, \u0111\u1ed3ng th\u1eddi m\u1ed9t s\u1ed1 t\u00ednh ch\u1ea5t c\u01a1 h\u1ecdc c\u1ee7a g\u1ed7 keo lai g\u1ed3m: \u0111\u1ed9 b\u1ec1n u\u1ed1n t\u0129nh, m\u00f4 \u0111un \u0111\u00e0n h\u1ed3i u\u1ed1n t\u0129nh, \u0111\u1ed9 r\u00f2n c\u1ee7a g\u1ed7 tr\u01b0\u1edbc v\u00e0 sau khi x\u1eed l\u00fd c\u0169ng \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh. K\u1ebft qu\u1ea3 ph\u00e2n t\u00edch ph\u01b0\u01a1ng sai \u0111a nh\u00e2n t\u1ed1 th\u1ec3 hi\u1ec7n, 3 nh\u00e2n t\u1ed1 \u1ea3nh h\u01b0\u1edfng g\u1ed3m nhi\u1ec7t \u0111\u1ed9, th\u1eddi gian, v\u1ecb tr\u00ed theo ph\u01b0\u01a1ng ngang th\u00e2n c\u00e2y (g\u1ed7 d\u00e1c, g\u1ed7 l\u00f5i) \u0111\u1ec1u c\u00f3 \u1ea3nh h\u01b0\u1edfng r\u00f5 \u0111\u1ebfn \u0111\u1ed9 b\u1ec1n u\u1ed1n t\u0129nh v\u00e0 \u0111\u1ed9 r\u00f2n c\u1ee7a g\u1ed7, tuy nhi\u00ean, c\u00e1c nh\u00e2n t\u1ed1 n\u00e0y \u1ea3nh h\u01b0\u1edfng kh\u00f4ng l\u1edbn \u0111\u1ebfn m\u00f4 \u0111un \u0111\u00e0n h\u1ed3i u\u1ed1n t\u0129nh. \u1ea2nh h\u01b0\u1edfng c\u1ee7a nhi\u1ec7t \u0111\u1ed9 v\u00e0 th\u1eddi gian x\u1eed l\u00fd \u0111\u1ebfn c\u00e1c t\u00ednh ch\u1ea5t n\u00e0y kh\u00f4ng t\u1ed3n t\u1ea1i ngo\u1ea1i tr\u1eeb \u0111\u1ed9 r\u00f2n c\u1ee7a g\u1ed7. C\u00e1c ch\u1ec9 ti\u00eau c\u01a1 h\u1ecdc n\u00e0y c\u1ee7a g\u1ed7 \u0111\u1ec1u c\u00f3 xu h\u01b0\u1edbng gi\u1ea3m khi t\u0103ng nhi\u1ec7t \u0111\u1ed9 v\u00e0 th\u1eddi gian x\u1eed l\u00fd.<\/p>\n

T\u1eeb kh\u00f3a: <\/i><\/b>\u0110\u1ed9 b\u1ec1n c\u01a1 h\u1ecdc, g\u1ed7 keo lai, x\u1eed l\u00fd nhi\u1ec7t<\/p>\n

 <\/td>\n<\/tr>\n

Effect of thermal treatment on some mechanical properties of Acacia hybrid wood <\/b><\/p>\n

High temperature treatment is an environmentally friendly method suitable for improving the wood quality. However, in some cases, the mechanical properties of heat – treated wood are decreased For studying the impact of this method on acacia\u2019s wood, In this study, the Acacia hybrid wood was treated in nitrogen gas under laboratory conditions for 2 – 6h at 210oC – 230oC. The mechanical properties of treated wood, including the modulus of rupture, modulus of elasticity and brittleness are tested in parallel with untreated samples The results of analysis showed that 3 factors including treatment temperature, treatment duration and wood parts (sapwood and heartwood) have significant effects on the modulus and brittlenessof high – temperature treated wood, howerver, these factors have no effect on the modulus of elasticity. The sresults also showed that these properties were reduced significantly by heat, but there is not effect of temperature and duration on them, excluding the brittleness.<\/p>\n

Keywords: <\/i><\/b>Acacia hybrid <\/i>wood, thermal treatment, wood strength<\/p>\n

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

CH\u1ebe \u0110\u1ed8 C\u1eaeT H\u1ee2P L\u00dd V\u1eacT LI\u1ec6U MDF TR\u00caN M\u00c1Y C\u01afA P – 2800 TM<\/b><\/p>\n

Ho\u00e0ng Vi\u1ec7t <\/b><\/p>\n

Vi\u1ec7n C\u00f4ng nghi\u1ec7p G\u1ed7, \u0110\u1ea1i h\u1ecdc L\u00e2m nghi\u1ec7p<\/i><\/p>\n\n\n\n\n
T\u00d3M T\u1eaeT <\/b>X\u00e1c \u0111\u1ecbnh ch\u1ebf \u0111\u1ed9 c\u1eaft h\u1ee3p l\u00fd lu\u00f4n l\u00e0 v\u1ea5n \u0111\u1ec1 th\u1eddi s\u1ef1, l\u00e0 y\u00eau c\u1ea7u l\u1edbn t\u1eeb th\u1ef1c ti\u1ec5n gia c\u00f4ng s\u1ea3n xu\u1ea5t \u0111\u1ed3 m\u1ed9c. B\u00e0i b\u00e1o n\u00e0y gi\u1edbi thi\u1ec7u k\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u x\u00e1c \u0111\u1ecbnh ch\u1ebf \u0111\u1ed9 c\u1eaft v\u1eadt li\u1ec7u g\u1ed7 MDF tr\u00ean thi\u1ebft b\u1ecb th\u00f4ng d\u1ee5ng l\u00e0 m\u00e1y c\u01b0a \u0111\u0129a Model P – 2800 TM. K\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u th\u1ef1c nghi\u1ec7m \u0111\u00e3 x\u00e1c \u0111\u1ecbnh c\u00e1c ph\u01b0\u01a1ng tr\u00ecnh to\u00e1n h\u1ecdc bi\u1ec3u th\u1ecb \u1ea3nh h\u01b0\u1edfng c\u1ee7a ba th\u00f4ng s\u1ed1 c\u01a1 b\u1ea3n thu\u1ed9c ch\u1ebf \u0111\u1ed9 c\u1eaft l\u00e0 v\u1eadn t\u1ed1c c\u1eaft v<\/i>, v\u1eadn t\u1ed1c \u0111\u1ea9y u<\/i>, chi\u1ec1u r\u1ed9ng me c\u01b0a r <\/i>t\u1edbi \u0111\u1ed9 vu\u00f4ng g\u00f3c th\u00e0nh m\u1ea1ch x\u1ebb, tham s\u1ed1 ch\u1ec9 ti\u00eau \u0111\u1eb7c tr\u01b0ng quan tr\u1ecdng c\u1ee7a chi ti\u1ebft gia c\u00f4ng t\u1eeb v\u00e1n MDF cho c\u00e1c s\u1ea3n ph\u1ea9m m\u1ed9c. T\u1eeb ph\u00e2n t\u00edch l\u00fd thuy\u1ebft v\u00e0 t\u1ed5ng h\u1ee3p k\u1ebft qu\u1ea3 th\u1ef1c nghi\u1ec7m \u0111\u00e3 x\u00e1c l\u1eadp \u0111\u01b0\u1ee3c b\u1ed9 c\u00e1c th\u00f4ng s\u1ed1 ch\u1ebf \u0111\u1ed9 c\u1eaft h\u1ee3p l\u00fd c\u1eaft v\u00e1n MDF d\u00e0y 20mm tr\u00ean m\u00e1y c\u01b0a \u0111\u0129a Model P – 2800TM, khi \u0111\u00f3 \u0111\u1ea3m b\u1ea3o \u0111\u01b0\u1ee3c y\u00eau c\u1ea7u cao v\u1ec1 \u0111\u1ed9 vu\u00f4ng g\u00f3c cho th\u00e0nh m\u1ea1ch c\u1eaft.<\/p>\n

T\u1eeb kh\u00f3a: <\/i><\/b>Ch\u1ebf \u0111\u1ed9 c\u1eaft, \u0111\u1ed3 m\u1ed9c, MDF, sai s\u1ed1 vu\u00f4ng g\u00f3c, v\u1eadn t\u1ed1c c\u1eaft, v\u1eadn t\u1ed1c \u0111\u1ea9y<\/p>\n

 <\/td>\n<\/tr>\n

Reasonable parameters of cutting of MDF material on sawing machine P – 2800 TM <\/b><\/p>\n

Determinative the appropriate cutting regime is a topical issue, a large requirement from processing practice of furniture manufacturing. This article introduces the results of a study to identify the regime cut MDF material on common equipment are disk saws Model P – 2800 TM. Results of experimental studies have identified the mathematical equations indicate the influence of the three basic parameters of the cut regime is the cut speed v<\/i>, push speed u<\/i>, width kerf saw blades r <\/i>to the rectangular of a circuit split, is a important indicators parameters of the workpiece from MDF material for wooden products. From theoretical analysis and synthesis experimental results has established a set of parameters of reasonable cutting regime to cut MDF 20mm thickness on disk saws Model P – 2800TM, while ensuring high demand for rectangular for a cutting artery.<\/p>\n

Keywords: <\/i><\/b>Cutting regime, furniture, MDF, quadrature error, cutting speed, velocity push<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

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

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