{"id":2307,"date":"2022-10-31T14:56:48","date_gmt":"2022-10-31T07:56:48","guid":{"rendered":"http:\/\/vafs.gov.vn\/en\/?p=2307"},"modified":"2023-11-24T15:02:47","modified_gmt":"2023-11-24T08:02:47","slug":"vietnam-journal-of-forest-science-number-4-2022","status":"publish","type":"post","link":"https:\/\/vafs.gov.vn\/en\/2022\/10\/vietnam-journal-of-forest-science-number-4-2022\/","title":{"rendered":"Vietnam Journal of Forest Science Number 4-2022"},"content":{"rendered":"

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

<\/a><\/a><\/a>T\u1ea0P CH\u00cd KHOA H\u1eccC L\u00c2M NGHI\u1ec6P S\u1ed0 <\/strong>4<\/strong> – <\/strong>20<\/strong>2<\/strong>2<\/strong><\/p>\n\n\n\n\n\n\n\n
1.<\/td>\nNghi\u00ean c\u1ee9u ch\u1ecdn gi\u1ed1ng keo lai m\u1edbi sinh tr\u01b0\u1edfng nhanh ph\u1ee5c v\u1ee5 tr\u1ed3ng r\u1eebng \u1edf v\u00f9ng Duy\u00ean h\u1ea3i
\nNam Trung B\u1ed9<\/td>\n		Selection of fast growing acacia hybrid clones for afforestation in South Central Coast of Vietnam<\/td>\nNguy\u1ec5n \u0110\u1ee9c Ki\u00ean
\nNg\u00f4 V\u0103n Ch\u00ednh
\nD\u01b0\u01a1ng H\u1ed3ng Qu\u00e2n<\/em><\/td>\n		5<\/td>\n<\/tr>\n
2.<\/td>\nNghi\u00ean c\u1ee9u k\u1ef9 thu\u1eadt nh\u00e2n gi\u1ed1ng Th\u00f4ng 5 l\u00e1 (Pinus dalatensis<\/em>) t\u1ea1i \u0110\u00e0 L\u1ea1t,
\nt\u1ec9nh L\u00e2m \u0110\u1ed3ng<\/td>\n		Research on propagation
\nto Pinus dalatensis<\/em> at
\nDa Lat city, Lam Dong province<\/td>\n		L\u00ea H\u1ed3ng \u00c9n
\nL\u00ea Th\u1ecb Th\u00fay H\u00f2a
\nNguy\u1ec5n B\u00e1 Trung
\nNg\u00f4 V\u0103n C\u1ea7m
\nL\u00ea V\u0103n H\u01b0\u01a1ng
\nL\u00ea V\u0103n S\u01a1n
\nL\u00ea C\u1ea3nh Nam<\/em><\/td>\n		12<\/td>\n<\/tr>\n
3.<\/td>\nNghi\u00ean c\u1ee9u nh\u00e2n gi\u1ed1ng T\u1ebfch (Tectona grandis<\/em> Linn.f) c\u00e1c d\u00f2ng ALTS v\u00e0 PN b\u1eb1ng ph\u01b0\u01a1ng ph\u00e1p nu\u00f4i c\u1ea5y m\u00f4<\/td>\nPropagation of Technona grandis<\/em> Linn.f clones ALTS and PN using tissue culture method<\/td>\nNguy\u1ec5n Anh D\u0169ng
\nV\u0103n Thu Huy\u1ec1n
\n\u0110\u1ed3ng Th\u1ecb \u01afng
\nL\u01b0u Th\u1ecb Qu\u1ef3nh
\nL\u00ea Th\u1ecb Hoa
\nHo\u00e0ng Th\u1ecb H\u1ed3ng H\u1ea1nh
\nNguy\u1ec5n Th\u1ecb Hi\u00ean
\nMai Th\u1ecb Ph\u01b0\u01a1ng Th\u00fay<\/em><\/td>\n		21<\/td>\n<\/tr>\n
4.<\/td>\n\u0110\u00e1nh gi\u00e1 sinh tr\u01b0\u1edfng c\u1ee7a m\u1ed9t s\u1ed1 gi\u1ed1ng Keo l\u00e1 tr\u00e0m (Acacia auriculiformis<\/em>)
\n\u0111\u00e3 \u0111\u01b0\u1ee3c c\u00f4ng nh\u1eadn t\u1ea1i Qu\u1ea3ng Ng\u00e3i<\/td>\n		The experiment results
\nof some Acacia auriculiformis<\/em> A. cunn. ex Benth. clones in Quang Ngai province<\/td>\n		Tr\u1ea7n H\u1eefu Bi\u1ec3n
\nNguy\u1ec5n Tr\u1ecdng T\u00e0i
\nPh\u00f9ng V\u0103n T\u1ec9nh
\n\u0110\u1ed7 Th\u1ecb Ng\u1ecdc H\u00e0
\n\u0110\u1eb7ng Thanh Qu\u1ef3nh<\/em><\/td>\n		30<\/td>\n<\/tr>\n
5.<\/td>\n\u0110\u00e1nh gi\u00e1 \u0111a d\u1ea1ng di truy\u1ec1n c\u00e2y Tr\u00e0m l\u00e1 d\u00e0i (Melaleuca leucadendra<\/em> L.) tr\u00ean \u0111\u1ea5t ng\u1eadp ph\u00e8n v\u00f9ng \u0110\u1ed3ng b\u1eb1ng s\u00f4ng
\nC\u1eedu Long<\/td>\n		Evaluate genetic diversity of Melaleuca leucadendra<\/em> L. in the alkaline soils
\nof Mekong Delta Region<\/td>\n		L\u00ea S\u01a1n
\nV\u0169 \u0110\u00ecnh H\u01b0\u1edfng
\nNguy\u1ec5n Th\u1ecb Huy\u1ec1n
\nKi\u1ec1u M\u1ea1nh H\u00e0
\nNguy\u1ec5n V\u0103n L\u01b0u<\/em><\/td>\n		38<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

 <\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n
6.<\/td>\nNghi\u00ean c\u1ee9u \u0111\u00e1nh gi\u00e1 \u0111a d\u1ea1ng di truy\u1ec1n ngu\u1ed3n gen c\u00e2y M\u1ea1y b\u00f3i (Bambusa burmanica<\/em> Gamble)
\nt\u1ea1i m\u1ed9t s\u1ed1 t\u1ec9nh T\u00e2y B\u1eafc<\/td>\n		Evaluate on genetic diversity of Bambusa burmanica<\/em> Gamble in some North – Western provinces of Vietnam<\/td>\nL\u00ea S\u01a1n
\nNguy\u1ec5n Th\u1ecb Vi\u1ec7t H\u00e0
\nL\u00ea Th\u1ecb Th\u1ee7y
\nH\u00e0 Th\u1ecb Huy\u1ec1n Ng\u1ecdc
\nTr\u1ea7n Th\u1ecb Thu H\u00e0
\n\u0110inh C\u00f4ng Tr\u00ecnh
\nL\u00ea Anh Thanh
\nNguy\u1ec5n Th\u1ecb H\u01b0\u01a1ng Ly
\nHo\u00e0ng Di\u1ec7p Linh
\nL\u00f2 V\u0103n B\u00ecnh
\nNguy\u1ec5n Thanh L\u00e2n<\/em><\/td>\n		48<\/td>\n<\/tr>\n
7.<\/td>\n\u0110a d\u1ea1ng sinh h\u1ecdc lo\u00e0i
\nc\u00e2y r\u1eebng t\u1ea1i Khu b\u1ea3o t\u1ed3n thi\u00ean nhi\u00ean \u0110\u1ed3ng S\u01a1n – K\u1ef3 Th\u01b0\u1ee3ng, th\u00e0nh ph\u1ed1
\nH\u1ea1 Long, t\u1ec9nh
\nQu\u1ea3ng Ninh<\/td>\n		Diversity of forest trees
\nin Dong Son – Ky Thuong Natural Reserve Area,
\nHa Long city, Quang Ninh province<\/td>\n		Nguy\u1ec5n To\u00e0n Th\u1eafng
\nTr\u1ea7n V\u0103n \u0110\u00f4
\nHo\u00e0ng Thanh S\u01a1n
\nTr\u1ecbnh Ng\u1ecdc Bon
\nD\u01b0\u01a1ng Quang Trung
\nV\u0169 Ti\u1ebfn L\u00e2m
\nHo\u00e0ng V\u0103n Th\u00e0nh
\n\u0110\u00e0o Trung \u0110\u1ee9c
\nNguy\u1ec5n H\u1eefu Hi\u1ec7p<\/em><\/td>\n		58<\/td>\n<\/tr>\n
8.<\/td>\n\u0110\u1eb7c \u0111\u1eb7c \u0111i\u1ec3m l\u00e2m h\u1ecdc c\u1ee7a r\u1eebng t\u1ef1 nhi\u00ean l\u00e1 r\u1ed9ng th\u01b0\u1eddng xanh tr\u00ean n\u00fai Ph\u00fa C\u01b0\u1eddng t\u1ea1i huy\u1ec7n T\u1ecbnh Bi\u00ean, t\u1ec9nh An Giang<\/td>\nForest characteristics of tropical evergreen closed forest at Phu Cuong mountain, Tinh Bien district, An Giang province<\/td>\nKi\u1ec1u Tu\u1ea5n \u0110\u1ea1t
\nL\u00ea Th\u00e0nh C\u00f4ng
\nB\u00f9i Vi\u1ec7t H\u1ea3i <\/em><\/td>\n		65<\/td>\n<\/tr>\n
9.<\/td>\n\u0110\u1eb7c \u0111i\u1ec3m c\u1ea5u tr\u00fac v\u00e0 \u0111a d\u1ea1ng th\u1ef1c v\u1eadt th\u00e2n g\u1ed7 r\u1eebng l\u00e1 r\u1ed9ng th\u01b0\u1eddng xanh t\u1ea1i Khu b\u1ea3o t\u1ed3n thi\u00ean nhi\u00ean H\u00f2n B\u00e0,
\nt\u1ec9nh Kh\u00e1nh H\u00f2a<\/td>\n		Structural characteristics and difference of evergreen broad-leaved forest in Hon Ba Nature Reserve Khanh Hoa province<\/td>\nTr\u1ea7n Kh\u00e1nh Hi\u1ec7u
\nHo\u00e0ng V\u0103n Th\u01a1i
\nL\u00ea Thanh Quang
\nNg\u00f4 V\u0103n Ng\u1ecdc
\nNguy\u1ec5n Tr\u1ecdng Nam<\/em><\/td>\n		78<\/td>\n<\/tr>\n
10.<\/td>\nM\u1ed9t s\u1ed1 \u0111\u1eb7c \u0111i\u1ec3m h\u00ecnh th\u00e1i, sinh th\u00e1i v\u00e0 v\u1eadt h\u1eadu c\u1ee7a V\u00e0ng t\u00e2m (Manglietia dandyi <\/em>Gagnep) \u1edf t\u1ec9nh S\u01a1n La v\u00e0 L\u00e0o Cai<\/td>\nSome morphologi, eclogical, and archeological characteristics of Manglietia dandyi<\/em> Gagnep in Son La, Lao Cai province<\/td>\nV\u0169 V\u0103n Thu\u1eadn
\nDi\u1ec7p Xu\u00e2n Tu\u1ea5n
\nTr\u1ecbnh Ng\u1ecdc Bon
\nNg\u00f4 V\u0103n \u0110\u1ed9
\nV\u0169 V\u0103n Tu\u00e2n<\/em><\/td>\n		87<\/td>\n<\/tr>\n
11.<\/td>\n\u0110\u1eb7c \u0111i\u1ec3m t\u00e1i sinh c\u1ee7a lo\u00e0i Hu\u1ef7nh (Tarrietia javanica<\/em> Blume) \u1edf v\u00f9ng B\u1eafc Trung B\u1ed9<\/td>\nRegenerative characteristics of Tarrietia javanica<\/em> Blume in North Central<\/td>\nPh\u1ea1m Ti\u1ebfn H\u00f9ng
\nPh\u1ea1m Xu\u00e2n \u0110\u1ec9nh
\nNguy\u1ec5n H\u1ea3i H\u00f2a
\nV\u0169 \u0110\u1ee9c B\u00ecnh
\nNguy\u1ec5n H\u1ea3i Th\u00e0nh
\nL\u00ea C\u00f4ng \u0110\u1ecbnh
\nHo\u00e0ng V\u0103n Tu\u1ea5n
\n\u0110\u01b0\u1eddng Ng\u1ecdc Danh<\/em><\/td>\n		97<\/td>\n<\/tr>\n
12.<\/td>\n\u0110\u1eb7c \u0111i\u1ec3m c\u1ea5u tr\u00fac m\u1ed9t s\u1ed1 hi\u1ec7n tr\u1ea1ng r\u1eebng ph\u1ed5 bi\u1ebfn t\u1ea1i huy\u1ec7n B\u00e1c \u00c1i, t\u1ec9nh Ninh Thu\u1eadn<\/td>\nStructural characteristics of some common forest status in Bac Ai district, Ninh Thuan province<\/td>\nPh\u00f9ng V\u0103n Khen
\nNguy\u1ec5n Tr\u1ecdng Nam
\nL\u00ea Tri\u1ec7u Duy
\nTr\u1ea7n V\u0103n Nho
\nB\u00f9i Quang H\u00e0
\n\u0110o\u00e0n Nh\u1eadt Xinh<\/em><\/td>\n		107<\/td>\n<\/tr>\n
13.<\/td>\nHi\u1ec7n tr\u1ea1ng ph\u00e2n b\u1ed1 v\u00e0 \u0111\u1eb7c \u0111i\u1ec3m l\u00e2m h\u1ecdc lo\u00e0i Ho\u00e0ng \u0111\u00e0n gi\u1ea3 (Dacrydium elatum<\/em> (Roxb.) Wall) t\u1ea1i R\u1eebng Qu\u1ed1c gia Y\u00ean T\u1eed, Qu\u1ea3ng Ninh<\/td>\nThe distribution status and silvicultural characteristics of Dacrydium elatum<\/em> (Roxb.) Wall in Yen Tu\u00a0National\u00a0Forests, Quang Ninh province<\/td>\nLa \u00c1nh D\u01b0\u01a1ng
\nHo\u00e0ng Thanh S\u01a1n
\nDo\u00e3n Ho\u00e0ng S\u01a1n
\nTr\u1ecbnh V\u0103n Hi\u1ec7u
\nH\u00e0 Huy Nh\u1eadt<\/em><\/td>\n		122<\/td>\n<\/tr>\n
14.<\/td>\nSinh kh\u1ed1i r\u1eebng tr\u1ed3ng keo lai theo tu\u1ed5i v\u00e0 c\u1ea5p \u0111\u1ea5t
\nt\u1ea1i Y\u00ean B\u00e1i<\/td>\n		Biomass accumulation of acacia hybrid plantation across ages and site indexes in Yen Bai province, Vietnam<\/td>\nNguy\u1ec5n V\u0103n B\u00edch
\nH\u00e0 Th\u1ecb Mai
\nV\u00f5 \u0110\u1ea1i H\u1ea3i<\/em><\/td>\n		132<\/td>\n<\/tr>\n
15.<\/td>\nNh\u1eadn bi\u1ebft nhanh g\u1ed7 c\u1ee7a m\u1ed9t s\u1ed1 lo\u00e0i c\u00e2y v\u01b0\u1eddn \u1edf Vi\u1ec7t Nam b\u1eb1ng c\u1ea5u t\u1ea1o
\nth\u00f4 \u0111\u1ea1i<\/td>\n		Rapit identification of wood of garden species in Vietnam by macroscopic features<\/td>\nB\u00f9i H\u1eefu Th\u01b0\u1edfng
\nL\u01b0u Qu\u1ed1c Th\u00e0nh
\nV\u0169 Th\u1ecb H\u1ed3ng Th\u1eafm
\nV\u0169 Th\u1ecb Ngoan
\nH\u00e0 Ti\u1ebfn M\u1ea1nh
\nTr\u1ea7n \u0110\u1ee9c Trung<\/em><\/td>\n		146<\/td>\n<\/tr>\n
16.<\/td>\nX\u00e1c \u0111\u1ecbnh th\u00f4ng s\u1ed1 c\u00f4ng ngh\u1ec7 \u00e9p ph\u1ee7 m\u1eb7t v\u00e1n l\u1ea1ng g\u1ed7 S\u1ed3i \u0111\u1ecf l\u00ean b\u1ec1 m\u1eb7t v\u00e1n gh\u00e9p thanh g\u1ed7 keo lai<\/td>\nDetermination of
\nhot-pressing technology parameters for overlaying Red Oak veneers on acacia finger joint boards<\/td>\n		T\u1ea1 Th\u1ecb Thanh H\u01b0\u01a1ng
\nNguy\u1ec5n V\u0103n \u0110\u1ecbnh
\nNg\u00f4 Trung S\u01a1n
\nNguy\u1ec5n \u0110\u1ee9c Th\u00e0nh
\nNguy\u1ec5n Thanh T\u00f9ng<\/em><\/td>\n		153<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

<\/a>NGHI\u00caN C\u1ee8U CH\u1eccN GI\u1ed0NG KEO LAI M\u1edaI SINH TR\u01af\u1edeNG NHANH\u00a0PH\u1ee4C V\u1ee4 TR\u1ed2NG R\u1eeaNG \u1ede V\u00d9NG DUY\u00caN H\u1ea2I NAM TRUNG B\u1ed8<\/p>\n

<\/a>Nguy\u1ec5n \u0110\u1ee9c Ki\u00ean, Ng\u00f4 V\u0103n Ch\u00ednh, D\u01b0\u01a1ng H\u1ed3ng Qu\u00e2n<\/p>\n

Vi\u1ec7n Nghi\u00ean c\u1ee9u Gi\u1ed1ng v\u00e0 C\u00f4ng ngh\u1ec7 sinh h\u1ecdc L\u00e2m nghi\u1ec7p<\/p>\n\n\n\n\n
T\u00d3M T\u1eaeT<\/p>\n

M\u1ee5c ti\u00eau c\u1ee7a nghi\u00ean c\u1ee9u nh\u1eb1m \u0111\u00e1nh gi\u00e1 kh\u1ea3 n\u0103ng sinh tr\u01b0\u1edfng v\u00e0 ch\u1ea5t l\u01b0\u1ee3ng th\u00e2n c\u00e2y c\u1ee7a c\u00e1c d\u00f2ng keo lai t\u1ef1 nhi\u00ean m\u1edbi ch\u1ecdn l\u1ecdc ph\u1ee5c v\u1ee5 tr\u1ed3ng r\u1eebng \u1edf v\u00f9ng duy\u00ean h\u1ea3i Nam Trung B\u1ed9. Nghi\u00ean c\u1ee9u \u0111\u01b0\u1ee3c ti\u1ebfn h\u00e0nh tr\u00ean kh\u1ea3o nghi\u1ec7m d\u00f2ng v\u00f4 t\u00ednh keo lai t\u1ef1 nhi\u00ean g\u1ed3m 40 d\u00f2ng, 5 l\u1ea7n l\u1eb7p, 10 c\u00e2y\/\u00f4 t\u1ea1i Quy Nh\u01a1n, B\u00ecnh \u0110\u1ecbnh. K\u1ebft qu\u1ea3 \u0111\u00e1nh gi\u00e1 \u1edf giai \u0111o\u1ea1n 55 th\u00e1ng tu\u1ed5i cho th\u1ea5y c\u00f3 s\u1ef1 sai kh\u00e1c r\u00f5 r\u1ec7t v\u1ec1 c\u00e1c ch\u1ec9 ti\u00eau sinh tr\u01b0\u1edfng, ch\u1ea5t l\u01b0\u1ee3ng th\u00e2n c\u00e2y v\u00e0 t\u1ef7 l\u1ec7 s\u1ed1ng gi\u1eefa c\u00e1c d\u00f2ng v\u00f4 t\u00ednh. Qua \u0111\u00e1nh gi\u00e1 \u0111\u00e3 x\u00e1c \u0111\u1ecbnh \u0111\u01b0\u1ee3c nh\u00f3m c\u00e1c d\u00f2ng sinh tr\u01b0\u1edfng t\u1ed1t nh\u1ea5t trong kh\u1ea3o nghi\u1ec7m l\u00e0 BV340, BV128, BV566, BV97 v\u00e0 BV110 v\u1edbi th\u1ec3 t\u00edch th\u00e2n c\u00e2y dao \u0111\u1ed9ng t\u1eeb 75,3 \u0111\u1ebfn 92,1 dm3<\/sup> v\u00e0 n\u0103ng su\u1ea5t \u0111\u1ea1t t\u1eeb 23,0 \u0111\u1ebfn 30,7 m3<\/sup>\/ha\/n\u0103m, v\u01b0\u1ee3t tr\u1ed9i so v\u1edbi gi\u1ed1ng BV32 l\u00e0 gi\u1ed1ng \u0111\u1ed1i ch\u1ee9ng \u0111\u1ea1i tr\u00e0 t\u1eeb 42 \u0111\u1ebfn 91%. C\u00e1c d\u00f2ng n\u00e0y \u0111\u1ed3ng th\u1eddi c\u00f3 th\u00e2n th\u1eb3ng, c\u00e0nh nh\u00e1nh nh\u1ecf v\u1edbi ch\u1ec9 ti\u00eau ch\u1ea5t l\u01b0\u1ee3ng th\u00e2n c\u00e2y t\u01b0\u01a1ng \u0111\u1ed1i cao, t\u1eeb 3,9 \u0111\u1ebfn 4,4 \u0111i\u1ec3m. \u0110\u00e2y l\u00e0 nh\u1eefng d\u00f2ng r\u1ea5t c\u00f3 tri\u1ec3n v\u1ecdng \u0111\u1ec3 c\u00f4ng nh\u1eadn gi\u1ed1ng m\u1edbi ph\u1ee5c v\u1ee5 tr\u1ed3ng r\u1eebng t\u1ea1i v\u00f9ng duy\u00ean h\u1ea3i Nam Trung B\u1ed9.<\/p>\n

T\u1eeb kh\u00f3a:<\/em><\/strong> Ch\u1ea5t l\u01b0\u1ee3ng th\u00e2n c\u00e2y, d\u00f2ng v\u00f4 t\u00ednh, keo lai, sinh tr\u01b0\u1edfng<\/td>\n<\/tr>\n

\n

<\/a>Selection of fast growing acacia hybrid clones for afforestation in South Central Coast of Vietnam<\/strong><\/p>\n

The objective of the study was to evaluate the growth and stem quality of the newly selected natural acacia hybrid clones for afforestation in the South Central Coast Region. The study was conducted in a natural acacia hybrid clonal test consisting of 40 clone, 5 replicates, 10 trees\/plot in Quy Nhon, Binh Dinh. Evaluation results at 55 months of age showed that there was a significant difference in all growth traits, stem quality and survival among clones. Through the evaluation, the group of best performing clones in the trial was identified as BV340, BV128, BV566, BV97 and BV110 with stem volume ranging from 75.3 to 92.1 dm3<\/sup> and mean annual increment from 23.0 to 30.7 m3<\/sup>\/ha\/year, 42 to 91% superior to BV32 which is the commercial control variety. These clones also have straight stems and small branches with relatively high stem quality index, ranging from 3.9 to 4.4 points. These are very promising lines to recognize as new varieties for afforestation in the South Central Coast Region.<\/p>\n

Keywords:<\/em><\/strong> Acacia hybrid, clones, growth, stem quality<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

<\/a>NGHI\u00caN C\u1ee8U K\u1ef8 THU\u1eacT NH\u00c2N GI\u1ed0NG TH\u00d4NG 5 L\u00c1 (Pinus dalatensis<\/em>)\u00a0T\u1ea0I \u0110\u00c0 L\u1ea0T, T\u1ec8NH L\u00c2M \u0110\u1ed2NG<\/p>\n

<\/a>L\u00ea H\u1ed3ng \u00c9n1<\/sup>, L\u00ea Th\u1ecb Th\u00fay H\u00f2a1<\/sup>, Nguy\u1ec5n B\u00e1 Trung1<\/sup>, Ng\u00f4 V\u0103n C\u1ea7m1<\/sup>,
\nL\u00ea V\u0103n H\u01b0\u01a1ng2<\/sup>, L\u00ea V\u0103n S\u01a1n2<\/sup>, L\u00ea C\u1ea3nh Nam1<\/sup><\/p>\n

1<\/sup>Vi\u1ec7n Khoa h\u1ecdc L\u00e2m nghi\u1ec7p Nam Trung B\u1ed9 v\u00e0 T\u00e2y Nguy\u00ean
\n<\/sup>2<\/sup>V\u01b0\u1eddn Qu\u1ed1c gia Bidoup – N\u00fai B\u00e0<\/p>\n\n\n\n\n
T\u00d3M T\u1eaeT<\/p>\n

Th\u00f4ng 5 l\u00e1 l\u00e0 lo\u00e0i \u0111\u1eb7c h\u1eefu theo ngh\u0129a r\u1ed9ng c\u1ee7a d\u00e3y Tr\u01b0\u1eddng S\u01a1n, c\u00f3 gi\u00e1 tr\u1ecb khoa h\u1ecdc v\u00e0 l\u00e0 lo\u00e0i c\u00e2y g\u1ed7 l\u1edbn n\u00ean c\u00f3 th\u1ec3 ph\u00e1t tri\u1ec3n th\u00e0nh r\u1eebng tr\u1ed3ng g\u1ed7 l\u1edbn t\u1ea1i T\u00e2y Nguy\u00ean. Trong nghi\u00ean c\u1ee9u n\u00e0y, c\u00e1c k\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u v\u1ec1 \u0111\u1eb7c \u0111i\u1ec3m qu\u1ea3, h\u1ea1t gi\u1ed1ng, t\u1ef7 l\u1ec7 n\u1ea3y m\u1ea7m, ph\u01b0\u01a1ng ph\u00e1p c\u1ea5y c\u00e2y, \u1ea3nh h\u01b0\u1edfng c\u1ee7a th\u00e0nh ph\u1ea7n ru\u1ed9t b\u1ea7u, che s\u00e1ng \u0111\u01b0\u1ee3c thi\u1ebft l\u1eadp. K\u00edch th\u01b0\u1edbc qu\u1ea3 \u0111\u1ea1t 11,1 cm chi\u1ec1u d\u00e0i v\u00e0 2,6 cm chi\u1ec1u r\u1ed9ng, k\u00edch th\u01b0\u1edbc h\u1ea1t \u0111\u1ea1t 7,6 mm chi\u1ec1u d\u00e0i, 3,9 mm chi\u1ec1u r\u1ed9ng v\u00e0 2,2 mm v\u1ec1 \u0111\u1ed9 d\u00e0y. M\u1ed9t kg h\u1ea1t gi\u1ed1ng \u0111\u1ea1t 44.188 h\u1ea1t, h\u00e0m l\u01b0\u1ee3ng n\u01b0\u1edbc 8 – 10% v\u1edbi t\u1ef7 l\u1ec7 h\u1ea1t ch\u1eafc 66,4%. T\u1ef7 l\u1ec7 n\u1ea3y m\u1ea7m \u0111\u1ea1t cao nh\u1ea5t l\u00e0 95,3% t\u1ea1i ph\u01b0\u01a1ng ph\u00e1p \u1ee7 h\u1ea1t trong t\u00fai v\u1ea3i, h\u1ea1t t\u1ea1i giai \u0111o\u1ea1n n\u1ee9t nanh, xu\u1ea5t hi\u1ec7n ch\u00f3p r\u1ec5 ph\u00f9 h\u1ee3p cho vi\u1ec7c c\u1ea5y v\u00e0o t\u00fai b\u1ea7u. Th\u00e0nh ph\u1ea7n ru\u1ed9t b\u1ea7u ph\u00f9 h\u1ee3p l\u00e0 \u0111\u1ea5t t\u1ea7ng A (0 – 30 cm) sau 12 th\u00e1ng \u0111\u1ea1t chi\u1ec1u cao 14,5 cm v\u00e0 ch\u1ebf \u0111\u1ed9 che s\u00e1ng ph\u00f9 h\u1ee3p l\u00e0 25% sau 17 th\u00e1ng \u0111\u1ea1t chi\u1ec1u cao 34,4 cm. K\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u t\u1ea1o ti\u1ec1n \u0111\u1ec1 cho c\u00e1c nghi\u00ean c\u1ee9u v\u1ec1 nh\u00e2n gi\u1ed1ng, \u0111\u1ed3ng th\u1eddi x\u00e2y d\u1ef1ng quy tr\u00ecnh nh\u00e2n gi\u1ed1ng ph\u00f9 h\u1ee3p cho lo\u00e0i Th\u00f4ng 5 l\u00e1.<\/p>\n

T\u1eeb kh\u00f3a:<\/em><\/strong> H\u1ea1t gi\u1ed1ng, c\u00e2y con, Th\u00f4ng 5 l\u00e1, t\u1ef7 l\u1ec7 n\u1ea3y m\u1ea7m<\/td>\n<\/tr>\n

\n

<\/a>Research on propagation to Pinus dalatensis<\/em> at Da Lat city, Lam Dong province<\/strong><\/p>\n

Pinus dalatensis <\/em>Ferr\u00e9 is an endemic species in the Truong Son range. It has scientific value and is a large tree species that can develop into large timber plantations in the Central Highlands area. In this study, research results on fruit characteristics, seeds, germination rate, transplanting method, and the experiment of the nursery period are established. The fruit size reached 11.1 cm in length and 2.6 cm in width. The seed size reached 7.6 mm in length, 3.9 mm in width, and 2.2 mm in thickness. One kg of seed reaches 44,188 seeds, with a water content of 8 – 10% with the percentage of solid seeds at 66.4%. The highest germination rate was 95.33% in the method of incubating seeds in the cloth bag. The seed at the canine cracking stage and the appearance of root tips are suitable for transplanting into potting bags. The suitable mixing soil composition is 100% of A-layer soil (0 – 30 cm) after 12 months, reaching a height of 14.5 cm and the appropriate shading mode is 25% after 17 months, reaching a height of 34.4 cm. The research results create a premise for breeding studies, and at the same time develop a suitable breeding process for Pinus dalatensis<\/em> species.<\/p>\n

Keywords:<\/em><\/strong> Seeds, seedlings, Pinus dalatensis<\/em>, germination rate<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

<\/a>NGHI\u00caN C\u1ee8U NH\u00c2N GI\u1ed0NG T\u1ebeCH (Tectona grandis <\/em>Linn.f)\u00a0C\u00c1C D\u00d2NG ALTS2 V\u00c0 PN4 B\u1eb0NG PH\u01af\u01a0NG PH\u00c1P NU\u00d4I C\u1ea4Y M\u00d4<\/p>\n

<\/a>Nguy\u1ec5n Anh D\u0169ng, V\u0103n Thu Huy\u1ec1n, \u0110\u1ed3ng Th\u1ecb \u01afng, L\u01b0u Th\u1ecb Qu\u1ef3nh, L\u00ea Th\u1ecb Hoa,
\nHo\u00e0ng Th\u1ecb H\u1ed3ng H\u1ea1nh, Nguy\u1ec5n Th\u1ecb Hi\u00ean, Mai Th\u1ecb Ph\u01b0\u01a1ng Th\u00fay<\/p>\n

Vi\u1ec7n Nghi\u00ean c\u1ee9u Gi\u1ed1ng v\u00e0 C\u00f4ng ngh\u1ec7 Sinh h\u1ecdc L\u00e2m nghi\u1ec7p
\nVi\u1ec7n Khoa h\u1ecdc L\u00e2m nghi\u1ec7p Vi\u1ec7t Nam<\/p>\n\n\n\n\n
T\u00d3M T\u1eaeT<\/p>\n

T\u1ebfch (Tectona grandis<\/em>) l\u00e0 m\u1ed9t trong nh\u1eefng lo\u00e0i g\u1ed7 c\u1ee9ng ch\u1ea5t l\u01b0\u1ee3ng, c\u00f3 gi\u00e1 tr\u1ecb kinh t\u1ebf cao. V\u1edbi t\u1ea7m quan tr\u1ecdng v\u00e0 v\u1ecb tr\u00ed n\u1ed5i b\u1eadt c\u1ee7a g\u1ed7 T\u1ebfch trong th\u1ecb tr\u01b0\u1eddng g\u1ed7 to\u00e0n c\u1ea7u, c\u00f9ng v\u1edbi ti\u1ec1m n\u0103ng g\u00f3p ph\u1ea7n t\u0103ng tr\u01b0\u1edfng kinh t\u1ebf qu\u1ed1c gia v\u00e0 d\u00e2n sinh cho c\u00e1c \u0111\u1ecba ph\u01b0\u01a1ng, T\u1ebfch l\u00e0 m\u1ed9t trong nh\u1eefng \u0111\u1ed1i t\u01b0\u1ee3ng \u0111\u01b0\u1ee3c quan t\u00e2m trong qu\u1ea3n l\u00fd r\u1eebng b\u1ec1n v\u1eefng (SMF) \u1edf nhi\u1ec1u n\u01b0\u1edbc nhi\u1ec7t \u0111\u1edbi v\u00e0 c\u1eadn nhi\u1ec7t, trong \u0111\u00f3 c\u00f3 Vi\u1ec7t Nam. Vi\u1ec7n Ngi\u00ean c\u1ee9u Gi\u1ed1ng v\u00e0 C\u00f4ng ngh\u1ec7 sinh h\u1ecdc L\u00e2m nghi\u1ec7p \u0111\u00e3 thu th\u1eadp \u0111\u01b0\u1ee3c m\u1ed9t s\u1ed1 d\u00f2ng T\u1ebfch c\u00f3 ti\u1ec1m n\u0103ng sinh tr\u01b0\u1edfng t\u1ed1t. Trong nghi\u00ean c\u1ee9u n\u00e0y, ph\u01b0\u01a1ng ph\u00e1p nh\u00e2n gi\u1ed1ng b\u1eb1ng nu\u00f4i c\u1ea5y m\u00f4 t\u1ebf b\u00e0o th\u1ef1c v\u1eadt \u0111\u00e3 \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n cho 2 d\u00f2ng T\u1ebfch ALTS2 v\u00e0 PN4, bao g\u1ed3m c\u00e1c n\u1ed9i dung nghi\u00ean c\u1ee9u: c\u00f4ng th\u1ee9c kh\u1eed tr\u00f9ng thi\u0301ch h\u01a1\u0323p, a\u0309nh h\u01b0\u01a1\u0309ng cu\u0309a ch\u1ea5t k\u00edch th\u00edch sinh tr\u01b0\u1edfng \u0111\u1ebfn kh\u1ea3 n\u0103ng nh\u00e2n ch\u1ed3i v\u00e0 ra r\u1ec5. K\u1ebft qu\u1ea3 cho th\u00e2\u0301y: Kh\u01b0\u0309 tru\u0300ng m\u00e2\u0303u b\u0103\u0300ng HgCl2 <\/sub>0,05% trong 5 ph\u00fat k\u1ebft h\u1ee3p v\u1edbi H2<\/sub>O2 <\/sub>15% trong 5 ph\u00fat cho k\u00ea\u0301t qua\u0309 t\u1ef7 l\u1ec7 b\u1eadt ch\u1ed3i cao nh\u1ea5t \u0111\u1ea1t 16,67% \u0111\u1ed1i v\u1edbi d\u00f2ng ALTS2 v\u00e0 17,78% \u0111\u1ed1i v\u1edbi d\u00f2ng PN4. M\u00f4i tr\u01b0\u01a1\u0300ng MS* co\u0301 b\u00f4\u0309 sung BAP 0,5 mg\/l, 30 g\/l sucrose, 3,5 g\/l agar cho h\u00ea\u0323 s\u00f4\u0301 nh\u00e2n ch\u1ed3i t\u00f4\u0301t nh\u00e2\u0301t 2,86 (ALTS2) v\u00e0 3,29 (PN4). Ty\u0309 l\u00ea\u0323 ra r\u00ea\u0303 \u0111\u1ea1t 88,89% (PN4) – 90% (ALTS2) khi s\u1eed d\u1ee5ng m\u00f4i tr\u01b0\u01a1\u0300ng 1\/2 MS* co\u0301 b\u00f4\u0309 sung 1,5 mg\/l IBA.<\/p>\n

T\u1eeb kh\u00f3a:<\/em><\/strong> Nh\u00e2n ch\u1ed3i, kh\u1eed tr\u00f9ng, nu\u00f4i c\u00e2\u0301y m\u00f4, ra r\u00ea\u0303, T\u00ea\u0301ch (d\u00f2ng ALTS2, PN4)<\/td>\n<\/tr>\n

\n

<\/a>Propagation of Technona grandis<\/em> Linn.f clones ALTS2 and PN4 using tissue culture method<\/strong><\/p>\n

Teak (Tectona grandis<\/em>) is one of the species of quality hardwood, with high economic value. With the importance and prominent position of Teak in the global timber market, along with the potential to contribute to national economic growth and population for localities, teak is one of the objects of interest in sustainable forest management in many tropical and subtropical countries, including Vietnam. Currently, in order to boarder the genetic resource, some teak clones with good growth potential have been collected by Institute of Forestry Tree Improvement and Biotechnology. Propagation ALTS2 and PN4 teak clones by tissue culture method was conducted, including studies on: Chemicals and appropriate bud disinfectant concentration, study the effect of growth stimulants on bud multiplier and rooting rate in the two clones. The results showed that disinfecting the sample with HgCl2<\/sub> 0.05% in 5 minutes followed by H2<\/sub>O2<\/sub> 15% in 5 minutes gave the best results 16.67% (ALTS2) and 17.78% (PN4). The MS* medium was supplemented with BAP 0.5 mg\/l, 30 g\/l sucrose, 3.5 g\/l agar for the best multiplier (2.86 for ALTS2 and 3.29 for PN4). The rooting rate was 88.89% (PN4) – 90% (ALTS2) with the medium of 1\/2 MS* with the addition of 1.5 mg\/l IBA.<\/p>\n

Keywords: <\/em><\/strong>Disinfectant, rooting, shoot multiplication, Tectona grandis, <\/em>tissue culture<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

<\/a>\u0110\u00c1NH GI\u00c1 SINH TR\u01af\u1edeNG C\u1ee6A M\u1ed8T S\u1ed0 GI\u1ed0NG\u00a0KEO L\u00c1 TR\u00c0M (Acacia auriculiformis<\/em> A. cunn. ex Benth.)\u00a0\u0110\u00c3 \u0110\u01af\u1ee2C C\u00d4NG NH\u1eacN T\u1ea0I QU\u1ea2NG NG\u00c3I<\/p>\n

<\/a>Tr\u1ea7n H\u1eefu Bi\u1ec3n1<\/sup>, Nguy\u1ec5n Tr\u1ecdng T\u00e0i1<\/sup>, Ph\u00f9ng V\u0103n T\u1ec9nh1<\/sup>,
\n\u0110\u1ed7 Th\u1ecb Ng\u1ecdc H\u00e01<\/sup>, \u0110\u1eb7ng Thanh Qu\u1ef3nh2<\/sup><\/p>\n

1<\/sup>Trung t\u00e2m Nghi\u00ean c\u1ee9u Th\u1ef1c nghi\u1ec7m L\u00e2m nghi\u1ec7p \u0110\u00f4ng Nam B\u1ed9
\n2<\/sup>C\u00f4ng ty TNHH M\u1ed9t th\u00e0nh vi\u00ean L\u00e2m nghi\u1ec7p Ba T\u01a1<\/p>\n\n\n\n\n
T\u00d3M T\u1eaeT<\/p>\n

Keo l\u00e1 tr\u00e0m l\u00e0 lo\u00e0i c\u00e2y tr\u1ed3ng l\u00e2m nghi\u1ec7p ch\u00ednh \u1edf n\u01b0\u1edbc ta v\u1edbi \u0111\u1eb7c \u0111i\u1ec3m sinh tr\u01b0\u1edfng nhanh, t\u00ednh ch\u1ea5t g\u1ed7 ph\u00f9 h\u1ee3p cho c\u00f4ng nghi\u1ec7p ch\u1ebf bi\u1ebfn s\u1ea3n xu\u1ea5t \u0111\u1ed3 m\u1ed9c. Trong giai \u0111o\u1ea1n 2010 – 2016, m\u1ed9t s\u1ed1 d\u00f2ng Keo l\u00e1 tr\u00e0m c\u00f3 n\u0103ng su\u1ea5t cao v\u00e0 c\u00f3 t\u00ednh ch\u1ed1ng ch\u1ecbu v\u1edbi n\u1ea5m b\u1ec7nh \u0111\u00e3 \u0111\u01b0\u1ee3c ch\u1ecdn l\u1ecdc v\u00e0 c\u00f4ng nh\u1eadn gi\u1ed1ng \u0111\u1ec3 ph\u00e1t tri\u1ec3n cho khu v\u1ef1c \u0110\u1ed3ng Nai v\u00e0 m\u1ed9t s\u1ed1 l\u1eadp \u0111\u1ecba c\u00f3 \u0111i\u1ec1u ki\u1ec7n t\u01b0\u01a1ng t\u1ef1. \u0110\u1ec3 ph\u00e1t tri\u1ec3n c\u00e1c gi\u1ed1ng m\u1edbi v\u00e0o s\u1ea3n xu\u1ea5t t\u1ea1i m\u1ed9t s\u1ed1 \u0111\u1ecba \u0111i\u1ec3m c\u00f3 \u0111i\u1ec1u ki\u1ec7n t\u1ef1 nhi\u00ean kh\u00e1c, vi\u1ec7c nghi\u00ean c\u1ee9u \u0111\u00e1nh gi\u00e1 kh\u1ea3 n\u0103ng sinh tr\u01b0\u1edfng l\u00e0 c\u1ea7n thi\u1ebft. K\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u kh\u1ea3o nghi\u1ec7m 5 d\u00f2ng Keo l\u00e1 tr\u00e0m AA42, AA53, AA56, AA92, AA95 v\u00e0 1 \u0111\u1ed1i ch\u1ee9ng t\u1ea1i Qu\u1ea3ng Ng\u00e3i trong th\u1eddi gian 46 th\u00e1ng tu\u1ed5i cho th\u1ea5y sinh tr\u01b0\u1edfng \u0111\u01b0\u1eddng k\u00ednh ngang ng\u1ef1c v\u00e0 \u0111\u1ed9 th\u1eb3ng th\u00e2n c\u00e1c gi\u1ed1ng kh\u00f4ng kh\u00e1c nhau r\u00f5 r\u1ec7t (Fpr>0,05); c\u00e1c ch\u1ec9 ti\u00eau chi\u1ec1u cao c\u00e2y, th\u1ec3 t\u00edch th\u00e2n c\u00e2y, t\u0103ng tr\u01b0\u1edfng h\u00e0ng n\u0103m, t\u1ef7 l\u1ec7 s\u1ed1ng, \u0111\u1ed9 nh\u1ecf c\u00e0nh, s\u1ee9c kh\u1ecfe \u0111\u1ec1u kh\u00e1c nhau r\u00f5 r\u1ec7t (Fpr<0,05); to\u00e0n b\u1ed9 kh\u1ea3o nghi\u1ec7m ch\u01b0a c\u00f3 d\u1ea5u hi\u1ec7u s\u00e2u b\u1ec7nh h\u1ea1i (P%=0). K\u1ebft qu\u1ea3 b\u01b0\u1edbc \u0111\u1ea7u \u0111\u00e3 ch\u1ecdn \u0111\u01b0\u1ee3c 3 gi\u1ed1ng g\u1ed3m AA56, AA95, AA92 n\u0103ng su\u1ea5t \u0111\u1ea1t cao nh\u1ea5t l\u1ea7n l\u01b0\u1ee3t l\u00e0 31,5 m3<\/sup>\/ha\/n\u0103m, 22,8 m3<\/sup>\/ha\/n\u0103m v\u00e0 19,6 m3<\/sup>\/ha\/n\u0103m (d\u00f2ng \u0111\u1ed1i ch\u1ee9ng ch\u1ec9 \u0111\u1ea1t 18,7 m3<\/sup>\/ha\/n\u0103m); ngo\u00e0i kh\u1ea3 n\u0103ng sinh tr\u01b0\u1edfng nhanh, c\u00e1c gi\u1ed1ng n\u00e0y \u0111\u1ec1u c\u00f3 ch\u1ea5t l\u01b0\u1ee3ng th\u00e2n c\u00e2y t\u1ed1t.<\/p>\n

T\u1eeb kh\u00f3a:<\/em><\/strong> Keo l\u00e1 tr\u00e0m, kh\u1ea3o nghi\u1ec7m, sinh tr\u01b0\u1edfng<\/td>\n<\/tr>\n

\n

<\/a>The experiment results of some Acacia auriculiformis<\/em> A. cunn. ex Benth. clones in Quang Ngai province<\/strong><\/p>\n

The Acacia auriculiformis <\/em>is the main species for Vietnam plantation, beside the fast growth characteries this species wood is suitable for furniture. In the period of 2010 – 2016, a number of Acacia auriculiformis<\/em> clones with high yield and resistance to fungal diseases were selected and recognized for development for Dong Nai area and some sites with similar conditions. In order to develop new varieties into production in some other natural conditions, research and evaluation of growth potential is necessary. The research results of 5 Acacia auriculiformis<\/em> clones (AA42, AA53, AA56, AA92, AA95) and one control (popular clone in Quang Ngai) in experiment in 46 months old showed that the diameter breast height and the stem straightness were non-significantly different (Fpr>0.05); the height, the volumme, the mean annual increament, the survival rate, the branch smallness, the strength were significantly different (Fpr<0.05); all clones were not infected by insects, fungus (P%=0). The early results showed that three clones including AA56, AA95, AA92 were the hightest productivity 31.5 m3<\/sup>\/ha\/year, 22.8 m3<\/sup>\/ha\/year v\u00e0 19.6 m3<\/sup>\/ha\/year (the control clone only reached 18.7 m3<\/sup>\/ha\/year), beside that their clones were the best stem quality.<\/p>\n

Keywords:<\/em><\/strong>Acacia auriculiformis, <\/em>experiment, growth<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

<\/a>\u0110\u00c1NH GI\u00c1 \u0110A D\u1ea0NG DI TRUY\u1ec0N\u00a0C\u00c2Y TR\u00c0M L\u00c1 D\u00c0I (Melaleuca leucadendra <\/em>L.<\/em>)\u00a0TR\u00caN \u0110\u1ea4T NG\u1eacP PH\u00c8N V\u00d9NG \u0110\u1ed2NG B\u1eb0NG S\u00d4NG C\u1eecU LONG<\/p>\n

<\/a>L\u00ea S\u01a1n1<\/sup>, V\u0169 \u0110\u00ecnh H\u01b0\u1edfng2<\/sup>, Nguy\u1ec5n Th\u1ecb Huy\u1ec1n1<\/sup>, Ki\u1ec1u M\u1ea1nh H\u00e02<\/sup>, Nguy\u1ec5n V\u0103n L\u01b0u2<\/sup><\/p>\n

1<\/sup> Vi\u1ec7n Nghi\u00ean c\u1ee9u Gi\u1ed1ng v\u00e0 C\u00f4ng ngh\u1ec7 Sinh h\u1ecdc L\u00e2m nghi\u1ec7p, Vi\u1ec7n Khoa h\u1ecdc L\u00e2m nghi\u1ec7p Vi\u1ec7t Nam
\n<\/sup>2 <\/sup>Trung t\u00e2m \u1ee8ng d\u1ee5ng Khoa h\u1ecdc K\u1ef9 thu\u1eadt L\u00e2m nghi\u1ec7p Nam B\u1ed9, Vi\u1ec7n Khoa h\u1ecdc L\u00e2m nghi\u1ec7p Nam B\u1ed9<\/p>\n\n\n\n\n
T\u00d3M T\u1eaeT<\/p>\n

Tr\u00e0m l\u00e1 d\u00e0i (Melaleuca leucadendra <\/em>L.) <\/em>l\u00e0 lo\u00e0i c\u00e2y g\u1ed7 \u0111\u01b0\u1ee3c tr\u1ed3ng ph\u1ed5 bi\u1ebfn tr\u00ean \u0111\u1ea5t ph\u00e8n v\u00f9ng \u0110\u1ed3ng b\u1eb1ng s\u00f4ng C\u1eedu Long nh\u1eb1m cung c\u1ea5p c\u1ecdc c\u1eeb trong x\u00e2y d\u1ef1ng, s\u1ea3n xu\u1ea5t \u0111\u1ed3 m\u1ed9c v\u00e0 l\u00e1 d\u00f9ng cho chi\u1ebft xu\u1ea5t tinh d\u1ea7u. Do \u0111\u00f3, vi\u1ec7c nghi\u00ean c\u1ee9u v\u1ec1 ch\u1ecdn t\u1ea1o v\u00e0 ph\u00e1t tri\u1ec3n gi\u1ed1ng cho lo\u00e0i c\u00e2y \u0111a m\u1ee5c \u0111\u00edch n\u00e0y c\u00f3 \u00fd ngh\u0129a r\u1ea5t l\u1edbn trong vi\u1ec7c ph\u00e1t tri\u1ec3n r\u1eebng \u1edf n\u01b0\u1edbc ta, \u0111\u1eb7c bi\u1ec7t \u0111\u1ed1i v\u1edbi khu v\u1ef1c Nam B\u1ed9. Vi\u1ec7c \u0111\u00e1nh gi\u00e1 \u0111a d\u1ea1ng di truy\u1ec1n b\u1eb1ng ch\u1ec9 th\u1ecb ph\u00e2n t\u1eed ISSR l\u00e0m c\u01a1 s\u1edf khoa h\u1ecdc cho vi\u1ec7c x\u00e2y d\u1ef1ng m\u1ee5c ti\u00eau nghi\u00ean c\u1ee9u c\u0169ng nh\u01b0 tri\u1ec3n khai c\u00e1c kh\u1ea3o nghi\u1ec7m h\u1eadu th\u1ebf\/d\u00f2ng v\u00f4 t\u00ednh k\u1ebft h\u1ee3p v\u1edbi x\u00e2y d\u1ef1ng v\u01b0\u1eddn gi\u1ed1ng l\u00e0 c\u00f3 \u00fd ngh\u0129a khoa h\u1ecdc v\u00e0 th\u1ef1c ti\u1ec5n. Trong nghi\u00ean c\u1ee9u n\u00e0y, 10 m\u1ed3i ISSR \u0111\u00e3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 \u0111\u00e1nh gi\u00e1 m\u1ee9c \u0111\u1ed9 \u0111a d\u1ea1ng di truy\u1ec1n c\u1ee7a 60 m\u1eabu c\u00e2y Tr\u00e0m l\u00e1 d\u00e0i thu \u1edf 3 qu\u1ea7n th\u1ec3 (Long An, Ki\u00ean Giang v\u00e0 C\u00e0 Mau) tr\u00ean \u0111\u1ea5t ng\u1eadp ph\u00e8n v\u00f9ng \u0110\u1ed3ng b\u1eb1ng s\u00f4ng C\u1eeda Long. K\u1ebft qu\u1ea3 thu \u0111\u01b0\u1ee3c 58 ph\u00e2n \u0111o\u1ea1n ISSR-PCR, trong \u0111\u00f3 t\u1ef7 l\u1ec7 ph\u00e2n \u0111o\u1ea1n \u0111a h\u00ecnh \u0111\u1ea1t 85,63%. Trong 3 qu\u1ea7n th\u1ec3 nghi\u00ean c\u1ee9u, qu\u1ea7n th\u1ec3 Long An c\u00f3 m\u1ee9c \u0111\u1ed9 \u0111a d\u1ea1ng di truy\u1ec1n cao nh\u1ea5t (h<\/em> = 0,327<\/em>), qu\u1ea7n th\u1ec3 Ki\u00ean Giang c\u00f3 m\u1ee9c \u0111\u1ed9 \u0111a d\u1ea1ng di truy\u1ec1n th\u1ea5p nh\u1ea5t (h = <\/em>0,297<\/em>). Ph\u00e2n t\u00edch m\u1ed1i quan h\u1ec7 di truy\u1ec1n cho th\u1ea5y 3 qu\u1ea7n th\u1ec3 c\u00f3 kho\u1ea3ng c\u00e1ch di truy\u1ec1n kh\u00f4ng cao, ch\u1ec9 \u0111\u1ea1t t\u1eeb 0,029 \u0111\u1ebfn 0,064 nh\u01b0ng m\u1ee9c \u0111\u1ed9 t\u01b0\u01a1ng \u0111\u1ed3ng t\u01b0\u01a1ng \u0111\u1ed1i cao, dao \u0111\u1ed9ng t\u1eeb 0,938 t\u1edbi 0,972. Ngo\u00e0i ra, qu\u1ea7n th\u1ec3 Ki\u00ean Giang c\u00f3 kho\u1ea3ng c\u00e1ch di truy\u1ec1n xa h\u01a1n so v\u1edbi 2 qu\u1ea7n th\u1ec3 c\u00f2n l\u1ea1i. K\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u n\u00e0y cho th\u1ea5y s\u1ef1 \u0111a d\u1ea1ng di truy\u1ec1n t\u01b0\u01a1ng \u0111\u1ed1i cao gi\u1eefa c\u00e1c qu\u1ea7n th\u1ec3, ch\u1ee9ng t\u1ecf vi\u1ec7c s\u1eed d\u1ee5ng qu\u1ea7n th\u1ec3 c\u00e2y tr\u1ed9i n\u00e0y \u0111\u1ec3 x\u00e2y d\u1ef1ng v\u01b0\u1eddn gi\u1ed1ng cung c\u1ea5p ngu\u1ed3n v\u1eadt li\u1ec7u di truy\u1ec1n cho tr\u1ed3ng r\u1eebng v\u00e0 c\u00e1c nghi\u00ean c\u1ee9u c\u1ea3i thi\u1ec7n gi\u1ed1ng v\u1eabn \u0111\u1ea3m b\u1ea3o \u0111\u01b0\u1ee3c t\u00ednh \u0111a d\u1ea1ng c\u1ea7n thi\u1ebft v\u00e0 \u0111\u1eb7c tr\u01b0ng c\u1ee7a lo\u00e0i Tr\u00e0m l\u00e1 d\u00e0i.<\/p>\n

T\u1eeb kh\u00f3a:<\/em><\/strong> Ch\u1ec9 th\u1ecb ph\u00e2n t\u1eed, \u0111a d\u1ea1ng di truy\u1ec1n, ISSR, Tr\u00e0m l\u00e1 d\u00e0i<\/td>\n<\/tr>\n

\n

<\/a>Evaluate genetic diversity of Melaleuca leucadendra<\/em> L. in the alkaline soils of Mekong Delta Region<\/strong><\/p>\n

Melaleuca leucadendra<\/em> is a multi-purpose species, the wood is used in construction and furniture, the leaves could be used as traditional medicine. Breeding for this species, in order to select the better varieties in growth and production, is required for reforestation programs in Vietnam. Therefore, the evaluation of genetic diversity by using the ISSR molecular marker helps to serve as a scientific basis for the development of posterity\/clonal tests, thereby starting the construction of Melaleuca leucadendra<\/em> seed garden in Vietnam. In this study, we used 10 pairs of ISSR primers to evaluate the genetic diversity of 60 Melaleuca leucadendra<\/em>, samples growing up in alkaline soils in the Mekong Delta area, collected from 3 populations (Long An, Kien Giang and Ca Mau). As a result, 58 ISSR-PCR segments were revealed, in which the polymorphic segment reached 85.63%. Among the examined populations, Long An recorded the highest figures for genetic diversity (h = 0.327), while Kien Giang had the lowest level of genetic diversity (h = 0.297). The analysis of genetic relationships showed that the 3 populations had a low genetic distance, from a mere 0.029 to 0.064, but a relatively high degree of similarity, ranging from 0.938 to 0.972, in which Kien Giang has a longer genetic distance than the other 2 populations. The results of this study show that the genetic diversity is relatively high, proving that the use of this dominant tree population to build a nursery providing genetic materials for afforestation and research on improving varieties still guarantees the diversity necessary for and typical of Melaleuca leucadendra<\/em>.<\/p>\n

Keywords:<\/em><\/strong> DNA markers, genetic diversity, ISSR, Melaleuca leucadendra<\/em><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

<\/a>NGHI\u00caN C\u1ee8U \u0110\u00c1NH GI\u00c1 \u0110A D\u1ea0NG DI TRUY\u1ec0N NGU\u1ed2N GEN\u00a0C\u00c2Y M\u1ea0Y B\u00d3I (Bambusa burmanica <\/em>Gamble)\u00a0T\u1ea0I M\u1ed8T S\u1ed0 T\u1ec8NH T\u00c2Y B\u1eaeC<\/p>\n

<\/a>L\u00ea S\u01a1n1*<\/sup>, Nguy\u1ec5n Th\u1ecb Vi\u1ec7t H\u00e01<\/sup>, L\u00ea Th\u1ecb Th\u1ee7y1<\/sup>, H\u00e0 Th\u1ecb Huy\u1ec1n Ng\u1ecdc1<\/sup>,
\nTr\u1ea7n Th\u1ecb Thu H\u00e01<\/sup>, \u0110inh C\u00f4ng Tr\u00ecnh2<\/sup>, L\u00ea Anh Thanh2<\/sup>, Nguy\u1ec5n Th\u1ecb H\u01b0\u01a1ng Ly2<\/sup>,
\nHo\u00e0ng Di\u1ec7p Linh2<\/sup>, L\u00f2 V\u0103n B\u00ecnh2<\/sup>, Nguy\u1ec5n Thanh L\u00e2n2<\/sup><\/p>\n

1<\/sup> Vi\u1ec7n Nghi\u00ean c\u1ee9u Gi\u1ed1ng v\u00e0 C\u00f4ng ngh\u1ec7 Sinh h\u1ecdc L\u00e2m nghi\u1ec7p, Vi\u1ec7n Khoa h\u1ecdc L\u00e2m nghi\u1ec7p Vi\u1ec7t Nam
\n2 <\/sup>Trung t\u00e2m Khoa h\u1ecdc L\u00e2m nghi\u1ec7p T\u00e2y B\u1eafc, Vi\u1ec7n Khoa h\u1ecdc L\u00e2m nghi\u1ec7p Vi\u1ec7t Nam<\/p>\n\n\n\n\n
T\u00d3M T\u1eaeT<\/p>\n

M\u1ea1y b\u00f3i (Bambusa burmanica <\/em>Gamble) l\u00e0 lo\u00e0i c\u00e2y \u0111a t\u00e1c d\u1ee5ng, c\u00f3 gi\u00e1 tr\u1ecb kinh t\u1ebf cao v\u00e0 \u0111\u01b0\u1ee3c d\u00f9ng ph\u1ed5 bi\u1ebfn \u1edf nhi\u1ec1u qu\u1ed1c gia, trong \u0111\u00f3 c\u00f3 Vi\u1ec7t Nam. \u1ede n\u01b0\u1edbc ta, M\u1ea1y b\u00f3i c\u00f3 ph\u00e2n b\u1ed1 t\u1ef1 nhi\u00ean ch\u1ee7 y\u1ebfu \u1edf khu v\u1ef1c T\u00e2y B\u1eafc. Nh\u1eefng n\u0103m g\u1ea7n \u0111\u00e2y, lo\u00e0i c\u00e2y n\u00e0y b\u1eaft \u0111\u1ea7u \u0111\u01b0\u1ee3c ph\u00e1t tri\u1ec3n trong s\u1ea3n xu\u1ea5t, do \u0111\u00f3 vi\u1ec7c nghi\u00ean c\u1ee9u ph\u00e1t tri\u1ec3n v\u00e0 b\u1ea3o t\u1ed3n ngu\u1ed3n gen lo\u00e0i c\u00e2y n\u00e0y l\u00e0 c\u1ea7n thi\u1ebft. Trong c\u00e1c ho\u1ea1t \u0111\u1ed9ng ch\u1ecdn l\u1ecdc v\u00e0 ph\u00e1t tri\u1ec3n gi\u1ed1ng, nghi\u00ean c\u1ee9u ph\u00e2n t\u00edch \u0111a d\u1ea1ng di truy\u1ec1n ngu\u1ed3n gen lo\u00e0i l\u00e0 ho\u1ea1t \u0111\u1ed9ng c\u1ea7n thi\u1ebft. C\u00e1c th\u00f4ng tin v\u1ec1 c\u1ea5u tr\u00fac qu\u1ea7n th\u1ec3, t\u00ednh \u0111a d\u1ea1ng di truy\u1ec1n c\u1ee7a lo\u00e0i cung c\u1ea5p nh\u1eefng th\u00f4ng tin c\u01a1 b\u1ea3n cho vi\u1ec7c x\u00e2y d\u1ef1ng c\u00e1c ho\u1ea1t \u0111\u1ed9ng nghi\u00ean c\u1ee9u v\u00e0 ph\u00e1t tri\u00ean \u0111\u1ec3 v\u1eeba ph\u00e1t tri\u1ec3n \u0111\u01b0\u1ee3c ngu\u1ed3n gi\u1ed1ng c\u00f3 ch\u1ea5t l\u01b0\u1ee3ng, l\u1ea1i v\u1eeba duy tr\u00ec t\u00ednh \u0111a d\u1ea1ng di truy\u1ec1n c\u1ea7n thi\u1ebft c\u1ee7a lo\u00e0i nh\u1eb1m \u0111\u00e1p \u1ee9ng c\u00e1c m\u1ee5c ti\u00eau nghi\u00ean c\u1ee9u trong t\u01b0\u01a1ng lai. K\u1ebft qu\u1ea3 ph\u00e2n t\u00edch 48 m\u1eabu M\u1ea1y b\u00f3i thu th\u1eadp t\u1eeb 3 t\u1ec9nh S\u01a1n La, \u0110i\u1ec7n Bi\u00ean v\u00e0 Lai Ch\u00e2u (4 \u0111i\u1ec3m\/t\u1ec9nh \u00b4 4 m\u1eabu\/\u0111i\u1ec3m) b\u1eb1ng 7 m\u1ed3i ISSR cho th\u1ea5y m\u1ee9c \u0111\u1ed9 \u0111a d\u1ea1ng di truy\u1ec1n c\u1ee7a M\u1ea1y b\u00f3i t\u01b0\u01a1ng \u0111\u1ed1i cao (h=0,198) v\u1edbi m\u1ee9c \u0111\u1ed9 sai kh\u00e1c v\u1ec1 m\u1eb7t di truy\u1ec1n gi\u1eefa c\u00e1c qu\u1ea7n th\u1ec3 l\u00e0 24%. Trong \u0111\u00f3, qu\u1ea7n th\u1ec3 S\u01a1n La c\u00f3 t\u00ednh \u0111a d\u1ea1ng di truy\u1ec1n cao nh\u1ea5t v\u00e0 c\u00f3 kho\u1ea3ng c\u00e1ch di truy\u1ec1n xa h\u01a1n h\u1eb3n so v\u1edbi 2 qu\u1ea7n th\u1ec3 c\u00f2n l\u1ea1i. M\u1ed9t s\u1ed1 \u1ee9ng d\u1ee5ng c\u1ee7a ph\u00e2n t\u00edch \u0111a d\u1ea1ng di truy\u1ec1n trong nghi\u00ean c\u1ee9u ph\u00e1t tri\u1ec3n ngu\u1ed3n gen lo\u00e0i c\u00e2y n\u00e0y c\u0169ng \u0111\u01b0\u1ee3c \u0111\u1ec1 c\u1eadp trong nghi\u00ean c\u1ee9u n\u00e0y.<\/p>\n

T\u1eeb kh\u00f3a:<\/em><\/strong> \u0110a d\u1ea1ng di truy\u1ec1n, ch\u1ec9 th\u1ecb ph\u00e2n t\u1eed, M\u1ea1y b\u00f3i, ISSR<\/td>\n<\/tr>\n

\n

<\/a>Evaluate on genetic diversity of Bambusa burmanica <\/em>Gamble in some North – Western provinces of Vietnam<\/strong><\/p>\n

Bambusa burmanica <\/em>Gamble is a popular multi-use species in many countries, including Vietnam. In Vietnam, Bambusa burmanica<\/em> Gamble is distributed naturally in the North-Western region. In recent years, this species is planted widely in some provinces for sprouts or canes production, thus research on genetic improvement and conservation is very important. The knowledge of genetic diversity provides the paramount information for research activities design in order to develop the genetic improved cultivars as well as maintain diverse genetic resources of the species. The results of the analysis of 48 samples of Bambusa burmanica<\/em> Gamble collected from 3 provinces of Son La, Dien Bien and Lai Chau (4 locations\/province \u00b4 4 samples\/location) using 7 ISSR primers show that the genetic diversity of May boi is relatively high (h=0.198) with 24% genetic difference between populations. Which, Son La population has the highest genetic diversity and a much longer genetic distance than the others. Some applications of genetic diversity analysis in the study of the genetic development of this species are also mentioned in this study.<\/p>\n

Keywords:<\/em><\/strong> Bambusa burmanica<\/em> Gamble, genetic diversity, ISSR, molecular marker<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

<\/a>\u0110A D\u1ea0NG SINH H\u1eccC LO\u00c0I C\u00c2Y R\u1eeaNG\u00a0T\u1ea0I KHU B\u1ea2O T\u1ed2N THI\u00caN NHI\u00caN \u0110\u1ed2NG S\u01a0N – K\u1ef2 TH\u01af\u1ee2NG,\u00a0TH\u00c0NH PH\u1ed0 H\u1ea0 LONG, T\u1ec8NH QU\u1ea2NG NINH<\/p>\n

<\/a>Nguy\u1ec5n To\u00e0n Th\u1eafng1<\/sup>, Tr\u1ea7n V\u0103n \u0110\u00f41<\/sup>, Ho\u00e0ng Thanh S\u01a1n1<\/sup>,
\nTr\u1ecbnh Ng\u1ecdc Bon1<\/sup>, D\u01b0\u01a1ng Quang Trung1<\/sup>, V\u0169 Ti\u1ebfn L\u00e2m1<\/sup>,
\nHo\u00e0ng V\u0103n Th\u00e0nh1<\/sup>, \u0110\u00e0o Trung \u0110\u1ee9c1<\/sup>, Nguy\u1ec5n H\u1eefu Hi\u1ec7p2<\/sup><\/p>\n

1<\/sup>Vi\u1ec7n Nghi\u00ean c\u1ee9u L\u00e2m sinh, Vi\u1ec7n Khoa h\u1ecdc L\u00e2m nghi\u1ec7p Vi\u1ec7t Nam
\n2<\/sup>Vi\u1ec7n Nghi\u00ean c\u1ee9u Gi\u1ed1ng v\u00e0 CNSH L\u00e2m nghi\u1ec7p<\/p>\n\n\n\n\n
T\u00d3M T\u1eaeT<\/p>\n

Khu b\u1ea3o t\u1ed3n thi\u00ean nhi\u00ean \u0110\u1ed3ng S\u01a1n – K\u1ef3 Th\u01b0\u1ee3ng (KBT) l\u00e0 khu r\u1eebng t\u1ef1 nhi\u00ean l\u00e1 r\u1ed9ng th\u01b0\u1eddng xanh tr\u00ean n\u00fai \u0111\u1ea5t l\u1edbn nh\u1ea5t hi\u1ec7n nay t\u1ea1i v\u00f9ng \u0110\u00f4ng B\u1eafc. Hi\u1ec3u \u0111\u01b0\u1ee3c th\u1ef1c tr\u1ea1ng \u0111a d\u1ea1ng sinh h\u1ecdc c\u00e1c lo\u00e0i c\u00e2y r\u1eebng trong KBT s\u1ebd g\u00f3p ph\u1ea7n v\u00e0o c\u00f4ng t\u00e1c b\u1ea3o t\u1ed3n v\u00e0 ph\u00e1t tri\u1ec3n t\u00e0i nguy\u00ean thi\u00ean nhi\u00ean v\u00e0 \u0111a d\u1ea1ng sinh h\u1ecdc t\u1ea1i \u0111\u00e2y. Ph\u01b0\u01a1ng ph\u00e1p tuy\u1ebfn \u0111i\u1ec1u tra v\u00e0 \u00f4 ti\u00eau chu\u1ea9n (OTC) t\u1ea1m th\u1eddi \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng. T\u1ed5ng s\u1ed1 OTC l\u1eadp v\u00e0 thu th\u1eadp s\u1ed1 li\u1ec7u tr\u00ean 38 OTC t\u1ea1i c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng r\u1eebng h\u1ed7n giao (HG), r\u1eebng l\u00e1 r\u1ed9ng th\u01b0\u1eddng xanh trung b\u00ecnh (TXTB), r\u1eebng l\u00e1 r\u1ed9ng th\u01b0\u1eddng xanh ngh\u00e8o (TXN) v\u00e0 r\u1eebng l\u00e1 r\u1ed9ng th\u01b0\u1eddng xanh ngh\u00e8o ki\u1ec7t (TXNK), \u0111\u01b0\u1ee3c ph\u00e2n b\u1ed1 tr\u00ean 2 \u0111ai cao < 300 m so v\u1edbi m\u1ef1c n\u01b0\u1edbc bi\u1ec3n v\u00e0 \u2265 300 m. C\u00e1c OTC c\u0169ng \u0111\u01b0\u1ee3c l\u1eadp t\u1ea1i ph\u00e2n khu b\u1ea3o v\u1ec7 nghi\u1ec7m ng\u1eb7t (BVNN) v\u00e0 ph\u00e2n khu ph\u1ee5c h\u1ed3i sinh th\u00e1i (PHST). K\u1ebft qu\u1ea3 cho th\u1ea5y c\u00f3 \u0111\u01b0\u1ee3c s\u1ef1 kh\u00e1c nhau r\u00f5 r\u1ec7t v\u1ec1 c\u00e1c ch\u1ec9 s\u1ed1 \u0111a d\u1ea1ng sinh h\u1ecdc gi\u1eefa 4 tr\u1ea1ng th\u00e1i r\u1eebng \u0111i\u1ec1u tra. R\u1eebng TXTB c\u00f3 \u0111a d\u1ea1ng sinh h\u1ecdc cao nh\u1ea5t, gi\u1ea3m \u0111\u1ebfn TXN, HG v\u00e0 th\u1ea5p nh\u1ea5t t\u1ea1i TXNK. C\u00f3 trung b\u00ecnh 41 lo\u00e0i\/OTC t\u1ea1i TXTB, 33 lo\u00e0i t\u1ea1i TXN, 26 lo\u00e0i t\u1ea1i HG v\u00e0 21 lo\u00e0i t\u1ea1i TXNK. Ch\u1ec9 s\u1ed1 \u0111a d\u1ea1ng sinh h\u1ecdc Shannon: 2,88 t\u1ea1i TXTB, 2,76 t\u1ea1i TXN, 2,61 t\u1ea1i HG v\u00e0 2,21 t\u1ea1i TXNK. Trong t\u1ed5ng s\u1ed1 367 lo\u00e0i ph\u00e1t hi\u1ec7n \u0111\u01b0\u1ee3c th\u00ec c\u00f3 312 lo\u00e0i t\u1ea1i \u0111ai cao < 300 m v\u00e0 155 lo\u00e0i t\u1ea1i \u0111ai cao \u2265 300 m; 286 lo\u00e0i ph\u00e1t hi\u1ec7n t\u1ea1i BVNN v\u00e0 218 lo\u00e0i ph\u00e1t hi\u1ec7n t\u1ea1i PHST. Khu b\u1ea3o t\u1ed3n thi\u00ean nhi\u00ean \u0110\u1ed3ng S\u01a1n – K\u1ef3 Th\u01b0\u1ee3ng c\u00f3 s\u1ef1 \u0111a d\u1ea1ng cao v\u1ec1 lo\u00e0i c\u00e2y r\u1eebng t\u1ea1i c\u00e1c tr\u1ea1ng th\u00e1i, ph\u00e2n khu v\u00e0 \u0111ai cao. M\u1eb7c d\u00f9 v\u1eady s\u1ef1 \u0111a d\u1ea1ng l\u00e0 kh\u00f4ng \u0111\u1ed3ng \u0111\u1ec1u do h\u1eadu qu\u1ea3 t\u00e1c \u0111\u1ed9ng c\u1ee7a con ng\u01b0\u1eddi tr\u01b0\u1edbc \u0111\u00e2y. V\u00ec v\u1eady, c\u1ea7n ch\u00fa tr\u1ecdng h\u01a1n n\u1eefa trong c\u00f4ng t\u00e1c b\u1ea3o t\u1ed3n v\u00e0 ph\u00e1t tri\u1ec3n nh\u1eb1m t\u0103ng s\u1ef1 \u0111a d\u1ea1ng v\u1ec1 lo\u00e0i c\u00e2y r\u1eebng t\u1ea1i t\u1ea5t c\u1ea3 c\u00e1c khu v\u1ef1c trong KBT.<\/p>\n

T\u1eeb kh\u00f3a:<\/em><\/strong> B\u1ea3o t\u1ed3n v\u00e0 ph\u00e1t tri\u1ec3n, ch\u1ec9 s\u1ed1 \u0111a d\u1ea1ng sinh h\u1ecdc, \u0111ai cao, lo\u00e0i c\u00e2y r\u1eebng, ph\u00e2n khu<\/td>\n<\/tr>\n

\n

<\/a>Diversity of forest trees in Dong Son – Ky Thuong Natural Reserve Area, Ha Long city, Quang Ninh province<\/strong><\/p>\n

Dong Son – Ky Thuong Natural Reserve Area is known as the largest natural forest area in Northeastern Vietnam. Understandings current status of forest tree diversity is important to support forest protection strategy and biodiversity conservation. A total of 38 temporally representative plots were used for field data collection, which were located in bamboo-timber mixed forest (BTMF), evergreen broadleaved medium forest (EBMF), evergreen broadleaved poor forest (EBPF), and evergreen broadleaved very poor forest (EBVPF) on both elevation zones of < 300 m above sea level and \u2265 300 m. These plots were also distributed in strictly protected area and forest recovered area. The results indicated that there were significant differences of diversity among four forest types. In term of species number, it was highest in EBMF (41 species\/plot), reducing to 33 species in EBPF, 26 species in BTMF and 21 species in EBVPF. Shannon diversity index was 2.88 in EBMF, 2.76 in EBPF, 2.61 in BTMF, and 2.21 in EBVPF. In total of 367 species found, 312 species were found in < 300 m elevation zone and 155 species in \u2265 300 m; 286 species found in strictly protected area and 218 species in forest recovered area. It is concluded that Dong Son – Ky Thuong Natural Reserve Area has high forest tree diversity. However, the diversity is much different among micro-sites as results of human disturbances in the past. Therefore, conservation activities still play an important role to not only conserve current biodiversity but also create suitable conditions for returns of many other species in specific micro-sites in the Natural Reserve Area.<\/p>\n

Keywords:<\/em><\/strong> Conservation and development, diversity index, elevation zone, forest tree species, zoning<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

<\/a>\u0110\u1eb6C \u0110I\u1ec2M L\u00c2M H\u1eccC\u00a0C\u1ee6A R\u1eeaNG T\u1ef0 NHI\u00caN L\u00c1 R\u1ed8NG TH\u01af\u1edcNG XANH\u00a0TR\u00caN N\u00daI PH\u00da C\u01af\u1edcNG T\u1ea0I HUY\u1ec6N T\u1ecaNH BI\u00caN, T\u1ec8NH AN GIANG<\/p>\n

<\/a>Ki\u1ec1u Tu\u1ea5n \u0110\u1ea1t1<\/sup>, L\u00ea Th\u00e0nh C\u00f4ng2<\/sup>, B\u00f9i Vi\u1ec7t H\u1ea3i 3<\/sup><\/p>\n

1<\/sup>Vi\u1ec7n Khoa h\u1ecdc L\u00e2m nghi\u1ec7p Nam B\u1ed9
\n<\/sup>2<\/sup> Chi c\u1ee5c Ki\u1ec3m l\u00e2m t\u1ec9nh An Giang
\n3<\/sup> H\u1ed9i Khoa h\u1ecdc K\u1ef9 thu\u1eadt L\u00e2m nghi\u1ec7p TP. H\u1ed3 Ch\u00ed Minh<\/p>\n\n\n\n\n
T\u00d3M T\u1eaeT<\/p>\n

Nghi\u00ean c\u1ee9u \u0111\u1eb7c \u0111i\u1ec3m l\u00e2m h\u1ecdc c\u1ee7a r\u1eebng t\u1ef1 nhi\u00ean l\u00e1 r\u1ed9ng th\u01b0\u1eddng xanh tr\u00ean n\u00fai Ph\u00fa C\u01b0\u1eddng t\u1ea1i huy\u1ec7n T\u1ecbnh Bi\u00ean, t\u1ec9nh An Giang \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n n\u0103m 2019. M\u1ee5c ti\u00eau c\u1ee7a nghi\u00ean c\u1ee9u l\u00e0 x\u00e1c \u0111\u1ecbnh \u0111\u01b0\u1ee3c c\u1ea5u tr\u00fac, \u0111a d\u1ea1ng t\u1ea7ng c\u00e2y g\u1ed7 v\u00e0 \u0111\u1eb7c \u0111i\u1ec3m l\u1edbp c\u00e2y t\u00e1i sinh t\u1ea1i khu v\u1ef1c nghi\u00ean c\u1ee9u l\u00e0m c\u01a1 s\u1edf khoa h\u1ecdc \u0111\u1ec1 xu\u1ea5t c\u00e1c gi\u1ea3i ph\u00e1p nh\u1eb1m b\u1ea3o t\u1ed3n v\u00e0 ph\u00e1t tri\u1ec3n b\u1ec1n v\u1eefng ngu\u1ed3n t\u00e0i nguy\u00ean r\u1eebng. Nghi\u00ean c\u1ee9u \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n tr\u00ean 09 \u00f4 ti\u00eau chu\u1ea9n v\u1edbi di\u1ec7n t\u00edch 2.000 m2<\/sup>\/\u00f4 \u0111\u1ed1i v\u1edbi t\u1ea7ng c\u00e2y cao v\u00e0 36 \u00f4 \u0111i\u1ec1u tra t\u00e1i sinh di\u1ec7n t\u00edch 25 m2<\/sup>\/\u00f4 tr\u00ean 3 d\u1ea1ng \u0111\u1ecba h\u00ecnh: ch\u00e2n (\u0110H1), s\u01b0\u1eddn (\u0110H2), \u0111\u1ec9nh (\u0110H3). K\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u \u0111\u00e3 ch\u1ec9 ra r\u1eb1ng: (i) Theo d\u1ea1ng \u0111\u1ecba h\u00ecnh, c\u00f3 s\u1ef1 gi\u1ea3m v\u1ec1 s\u1ed1 h\u1ecd th\u1ef1c v\u1eadt v\u00e0 s\u1ed1 c\u00e2y c\u00e1 th\u1ec3 theo th\u1ee9 t\u1ef1 s\u01b0\u1eddn – ch\u00e2n – \u0111\u1ec9nh. To\u00e0n khu v\u1ef1c c\u00f3 38 h\u1ecd v\u00e0 75 lo\u00e0i th\u1ef1c v\u1eadt, trong \u0111\u00f3 8 h\u1ecd th\u1ef1c v\u1eadt c\u00f3 ch\u1ec9 s\u1ed1 IVI tr\u00ean 5%. Ph\u00e2n b\u1ed1 s\u1ed1 c\u00e2y, t\u1ed5ng ti\u1ebft di\u1ec7n ngang v\u00e0 tr\u1eef l\u01b0\u1ee3ng r\u1eebng theo c\u00e1c c\u1ea5p \u0111\u01b0\u1eddng k\u00ednh ho\u1eb7c chi\u1ec1u cao \u0111\u1ec1u kh\u00f4ng kh\u00e1c bi\u1ec7t nhi\u1ec1u gi\u1eefa c\u00e1c d\u1ea1ng \u0111\u1ecba h\u00ecnh; (ii) \u0110\u1eb7c tr\u01b0ng c\u1ee7a ph\u00e2n b\u1ed1 th\u1ef1c nghi\u1ec7m s\u1ed1 c\u00e2y theo c\u1ea5p \u0111\u01b0\u1eddng k\u00ednh (N\/D1,3<\/sub>) \u0111\u1ec1u l\u00e0 ph\u00e2n b\u1ed1 gi\u1ea3m, c\u1ee7a ph\u00e2n b\u1ed1 th\u1ef1c nghi\u1ec7m s\u1ed1 c\u00e2y theo c\u1ea5p chi\u1ec1u cao (N\/Hvn<\/sub>) \u0111\u1ec1u l\u00e0 ph\u00e2n b\u1ed1 m\u1ed9t \u0111\u1ec9nh, h\u01a1i l\u1ec7ch tr\u00e1i. S\u1ed1 h\u1ecd th\u1ef1c v\u1eadt v\u00e0 s\u1ed1 lo\u00e0i c\u00e2y g\u1ed7 xu\u1ea5t hi\u1ec7n \u1edf d\u1ea1ng \u0110H2 cao h\u01a1n so v\u1edbi d\u1ea1ng \u0110H1 v\u00e0 d\u1ea1ng \u0110H3. \u0110a d\u1ea1ng lo\u00e0i c\u00e2y g\u1ed7 c\u1ee7a c\u1ea3 tr\u1ea1ng th\u00e1i r\u1eebng (d = 6,10), ch\u1ec9 s\u1ed1 \u01b0u th\u1ebf Simpson (1 – \u03bb) c\u1ee7a to\u00e0n tr\u1ea1ng th\u00e1i trong kho\u1ea3ng 0,91 – 0,95; (iii) T\u1ed5 th\u00e0nh nh\u00f3m lo\u00e0i c\u00e2y t\u00e1i sinh \u01b0u th\u1ebf kh\u00f4ng gi\u1ed1ng nhau gi\u1eefa c\u00e1c d\u1ea1ng \u0111\u1ecba h\u00ecnh. C\u00e1c lo\u00e0i c\u00e2y t\u00e1i sinh c\u00f3 t\u1ed5 th\u00e0nh t\u01b0\u01a1ng \u0111\u1ed1i gi\u1ed1ng nh\u01b0 t\u1ed5 th\u00e0nh t\u1ea7ng c\u00e2y cao v\u00e0 c\u00f3 t\u1eeb 3 \u0111\u1ebfn 5 lo\u00e0i tham gia v\u00e0o t\u1ed5 th\u00e0nh ch\u00ednh. C\u0103n c\u1ee9 v\u00e0o t\u1ef7 l\u1ec7 c\u00e2y c\u00f3 chi\u1ec1u cao l\u1edbn h\u01a1n 1,0 m, c\u00f3 ch\u1ea5t l\u01b0\u1ee3ng t\u1eeb trung b\u00ecnh tr\u1edf l\u00ean v\u00e0 c\u00f3 ngu\u1ed3n g\u1ed1c h\u1ea1t th\u00ec m\u1eadt \u0111\u1ed9 c\u00e2y t\u00e1i sinh c\u00f3 tri\u1ec3n v\u1ecdng l\u00e0 1.594 c\u00e2y\/ha (\u0110H1), 1.855 c\u00e2y\/ha (\u0110H2) v\u00e0 1.200 c\u00e2y\/ha (\u0110H3). Bi\u1ec7n ph\u00e1p k\u1ef9 thu\u1eadt l\u00e2m sinh \u0111\u1ec3 b\u1ea3o t\u1ed3n \u0111a d\u1ea1ng th\u1ef1c v\u1eadt t\u1eadp trung v\u00e0o c\u00f4ng t\u00e1c khoanh nu\u00f4i ho\u1eb7c khoanh nu\u00f4i x\u00fac ti\u1ebfn t\u00e1i sinh c\u00f3 tr\u1ed3ng b\u1ed5 sung c\u00e1c lo\u00e0i c\u00e2y c\u00f3 gi\u00e1 tr\u1ecb kinh t\u1ebf v\u00e0 b\u1ea3o t\u1ed3n cao. Ri\u00eang \u0111\u1ed1i v\u1edbi \u0111\u1ecba h\u00ecnh cao tr\u00ean \u0111\u1ec9nh n\u00fai (\u0110H1) c\u1ea7n b\u1ea3o v\u1ec7 nghi\u00eam ng\u1eb7t \u0111\u1ec3 kh\u00f4ng l\u00e0m \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn t\u00e1i sinh di\u1ec5n th\u1ebf t\u1ef1 nhi\u00ean c\u1ee7a r\u1eebng.<\/p>\n

T\u1eeb kh\u00f3a:<\/em><\/strong> \u0110\u1eb7c \u0111i\u1ec3m l\u00e2m h\u1ecdc, t\u1ea7ng c\u00e2y cao, c\u00e2y t\u00e1i sinh<\/td>\n<\/tr>\n

\n

<\/a>Forest characteristics of tropical evergreen closed forest at Phu Cuong mountain, Tinh Bien district, An Giang province<\/strong><\/p>\n

Research on characteristics of tropical evergreen evergreen forest at Phu Cuong mountain area, Tinh Bien district, An Giang province has been implemented in 2019. The puppose of study to determine the forestry characteristics of the restored forest state, as a scientific basis for proposing solutions to conservation and sustainable development of forest resources. The study of 09 sample plot with \u200b\u200b2,000 m2<\/sup> for each typical area and 36 plots with 25 m2<\/sup> for investigated gemination index. The research show that: (i) In the form of topography, there is a decrease in the number of plant families and number of individual trees in the order: ribs – feet – peaks. The whole area has 38 families and 75 plant species. There are 8 families of plants with an IVI index of over 5%. The distribution of the number of trees and total cross sections and the volume of forests by diameter or height are not much different between the types of terrain. The characteristics of the experimental distribution of the number of trees according to diameter class are all reduced distribution, the empirical distribution of the number of trees according to the height level is a distribution of a peak, a bit left. (ii) Number of plant families and number of tree species appear in DH2 is higher than that of DH1 and DH3. The diversity of timber species of both forest status\u00a0(d = 6.10), Simpson’s dominant index (1 – \u03bb), the average of the state in the range of 0.91 – 0.95. (iii) The group of species of regenerated tree species is not the same among the terrain types. The species of regenerated trees have relatively similar composition to high tree formation, with 3 to 5 species participating in the main group. Based on the proportion of trees with a height greater than 1.0 m, over average quality and original proportion from seed, the density of promising regenerating trees will be 1,594 trees\/ha (DH1), 1,855 trees\/ha (DH2) and 1,200 trees\/ha (DH3). Silvicultural techniques to diversity conservation in Phu Cuong mountain area focus on protection forest combine with additional planting of tree species of high economic and conservation value. Particularly for the high terrain on the top of the mountain (DH1), it is necessary to strictly protect it so as not to affect the natural regeneration of the forest.<\/p>\n

Keywords:<\/em><\/strong> Silvicultural charateristic, timber stand, generration<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

<\/a>\u0110\u1eb6C \u0110I\u1ec2M C\u1ea4U TR\u00daC V\u00c0 \u0110A D\u1ea0NG TH\u1ef0C V\u1eacT TH\u00c2N G\u1ed6\u00a0R\u1eeaNG L\u00c1 R\u1ed8NG TH\u01af\u1edcNG XANH T\u1ea0I KHU B\u1ea2O T\u1ed2N THI\u00caN NHI\u00caN\u00a0H\u00d2N B\u00c0, T\u1ec8NH KH\u00c1NH H\u00d2A<\/p>\n

<\/a>Tr\u1ea7n Kh\u00e1nh Hi\u1ec7u, Ho\u00e0ng V\u0103n Th\u01a1i, L\u00ea Thanh Quang,
\nNg\u00f4 V\u0103n Ng\u1ecdc, Nguy\u1ec5n Tr\u1ecdng Nam<\/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

M\u1ee5c ti\u00eau c\u1ee7a nghi\u00ean c\u1ee9u n\u00e0y l\u00e0 \u0111\u00e1nh gi\u00e1 m\u1ed9t s\u1ed1 \u0111\u1eb7c \u0111i\u1ec3m c\u1ea5u tr\u00fac v\u00e0 m\u1ee9c \u0111\u1ed9 \u0111a d\u1ea1ng c\u1ee7a lo\u00e0i c\u00e2y th\u00e2n g\u1ed7 thu\u1ed9c Khu b\u1ea3o t\u1ed3n thi\u00ean nhi\u00ean H\u00f2n B\u00e0. \u0110\u1ed1i t\u01b0\u1ee3ng nghi\u00ean c\u1ee9u l\u00e0 ba tr\u1ea1ng th\u00e1i r\u1eebng gi\u00e0u, trung b\u00ecnh v\u00e0 ngh\u00e8o thu\u1ed9c ki\u1ec3u r\u1eebng n\u00fai \u0111\u1ea5t l\u00e1 r\u1ed9ng th\u01b0\u1eddng xanh. K\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u cho th\u1ea5y trong 20 \u0111\u1ebfn 32 lo\u00e0i c\u00e2y \u1edf m\u1ed7i \u00f4 \u0111o \u0111\u1ebfm, c\u00f3 5 \u0111\u1ebfn 8 lo\u00e0i tham gia v\u00e0o c\u00f4ng th\u1ee9c t\u1ed5 th\u00e0nh. Ph\u00e2n b\u1ed1 s\u1ed1 c\u00e2y theo c\u1ee1 \u0111\u01b0\u1eddng k\u00ednh v\u00e0 chi\u1ec1u cao \u0111a ph\u1ea7n c\u00f3 d\u1ea1ng ph\u00e2n b\u1ed1 gi\u1ea3m d\u1ea7n v\u00e0 tu\u00e2n theo ph\u00e2n b\u1ed1 Weibull. S\u1ed1 c\u00e2y t\u1eadp trung \u1edf c\u1ee1 \u0111\u01b0\u1eddng k\u00ednh 10 – 20 cm, c\u1ee1 chi\u1ec1u cao 10 – 15 m. C\u00e1c tr\u1ea1ng th\u00e1i r\u1eebng kh\u00e1 \u0111a d\u1ea1ng v\u1ec1 th\u00e0nh ph\u1ea7n lo\u00e0i c\u00e2y v\u1edbi s\u1ed1 lo\u00e0i xu\u1ea5t hi\u1ec7n tr\u00ean c\u00e1c tr\u1ea1ng th\u00e1i dao \u0111\u1ed9ng t\u1eeb 48 \u0111\u1ebfn 54 lo\u00e0i. M\u1ed9t s\u1ed1 tr\u1ea1ng th\u00e1i r\u1eebng l\u00e1 r\u1ed9ng th\u01b0\u1eddng xanh t\u1ea1i Khu b\u1ea3o t\u1ed3n thi\u00ean nhi\u00ean H\u00f2n B\u00e0 c\u00f3 ch\u1ec9 s\u1ed1 \u0111a d\u1ea1ng sinh h\u1ecdc \u0111\u1ea1t gi\u00e1 tr\u1ecb t\u01b0\u01a1ng \u0111\u1ed1i cao v\u00e0 cao h\u01a1n m\u1ed9t s\u1ed1 khu v\u1ef1c kh\u00e1c. Ch\u1ec9 s\u1ed1 Simpson t\u01b0\u01a1ng \u0111\u1ed1i \u1ed5n \u0111\u1ecbnh \u1edf c\u1ea3 ba tr\u1ea1ng th\u00e1i 0,97, ch\u1ec9 s\u1ed1 Shannon-Wiener dao \u0111\u1ed9ng t\u1eeb 3,57 \u0111\u1ebfn 3,64, ch\u1ec9 s\u1ed1 Margalef n\u1eb1m trong kho\u1ea3ng 9,19 \u0111\u1ebfn 9,66. Khu v\u1ef1c nghi\u00ean c\u1ee9u c\u00f3 20 lo\u00e0i c\u00e2y n\u1eb1m trong Danh l\u1ee5c c\u1ee7a IUCN v\u00e0 S\u00e1ch \u0110\u1ecf Vi\u1ec7t Nam, \u0111\u1eb7c bi\u1ec7t c\u00f3 hai lo\u00e0i thu\u1ed9c nh\u00f3m nguy c\u1ea5p theo Danh l\u1ee5c \u0110\u1ecf IUCN c\u1ea7n \u0111\u01b0\u1ee3c b\u1ea3o v\u1ec7 l\u00e0 Ch\u00f2 n\u00e2u (Dipterocarpus retusus) <\/em>v\u00e0 Xo\u00e0i r\u1eebng (Mangifera minutifolia).<\/em><\/p>\n

T\u1eeb kh\u00f3a:<\/em><\/strong> C\u1ea5u tr\u00fac, \u0111a d\u1ea1ng, Khu b\u1ea3o t\u1ed3n thi\u00ean nhi\u00ean H\u00f2n B\u00e0, r\u1eebng l\u00e1 r\u1ed9ng th\u01b0\u1eddng xanh<\/td>\n<\/tr>\n

\n

<\/a>Structural characteristics and difference of evergreen broad-leaved forest in Hon Ba Nature Reserve, Khanh Hoa province<\/strong><\/p>\n

The objective of this study is to evaluate some structural features and diversity of woody plants in Hon Ba Nature Reserve. The subjects of the study are the three states of rich, medium and poor forests of evergreen broadleaf forest. Research results show that in 20 to 32 tree species in each plot, there are 5 to 8 species participating in the composition formula. The distribution of number of trees by diameter and height is mostly descending and follows the Weibull distribution. The number of trees is concentrated in the size of 10 – 20 cm in diameter and 10 – 15 m in height. The forest states are quite diverse in terms of tree species composition with the number of species appearing in each state ranging from 48 to 54 species. Some states of evergreen broadleaf forest in Hon Ba Nature Reserve have a relatively high biodiversity index and higher than some other areas. The Simpson index is relatively stable in all three states of 0.97, the Shannon-Wiener index ranges from 3.57 to 3.64, the Margalef index ranges from 9.19 to 9.66. The study area has 20 species of trees on the IUCN and Vietnam Red List, especially two species of endangered species on the IUCN Red List that need to be protected, namely Dipterocarpus retusus <\/em>and Mangifera minutifolia.<\/em><\/p>\n

Keywords:<\/em><\/strong> Diversity,\u00a0Hon Ba Nature Reserve, structure, evergreen broadleaf forest<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

<\/a>M\u1ed8T S\u1ed0 \u0110\u1eb6C \u0110I\u1ec2M H\u00ccNH TH\u00c1I, SINH TH\u00c1I V\u00c0 V\u1eacT H\u1eacU\u00a0C\u1ee6A V\u00c0NG T\u00c2M (Manglietia dandyi<\/em> Gagnep)\u00a0\u1ede T\u1ec8NH S\u01a0N LA V\u00c0 L\u00c0O CAI<\/p>\n

<\/a>V\u0169 V\u0103n Thu\u1eadn1<\/sup>, Di\u1ec7p Xu\u00e2n Tu\u1ea5n1<\/sup>, Tr\u1ecbnh Ng\u1ecdc Bon2<\/sup>, Ng\u00f4 V\u0103n \u0110\u1ed93<\/sup>, V\u0169 V\u0103n Tu\u00e2n4<\/sup><\/p>\n

1<\/sup>Trung t\u00e2m NC&CG k\u1ef9 thu\u1eadt L\u00e2m sinh, 2<\/sup>Vi\u1ec7n Nghi\u00ean c\u1ee9u L\u00e2m sinh;
\n3<\/sup>Chi c\u1ee5c Ki\u1ec3m l\u00e2m t\u1ec9nh S\u01a1n La; 4<\/sup>Trung t\u00e2m Khoa h\u1ecdc L\u00e2m nghi\u1ec7p T\u00e2y B\u1eafc<\/p>\n\n\n\n\n
T\u00d3M T\u1eaeT<\/p>\n

Va\u0300ng t\u00e2m l\u00e0 c\u00e2y b\u1ea3n \u0111\u1ecba, m\u1ecdc t\u01b0\u01a1ng \u0111\u1ed1i nhanh v\u00e0 c\u00f3 gi\u00e1 tr\u1ecb kinh t\u1ebf cao. Nghi\u00ean c\u1ee9u \u0111\u1eb7c \u0111i\u1ec3m h\u00ecnh th\u00e1i, sinh th\u00e1i v\u00e0 v\u1eadt h\u1eadu c\u00f3 \u00fd ngh\u0129a quan tr\u1ecdng \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh \u0111\u1eb7c \u0111i\u1ec3m c\u1ee7a lo\u00e0i, ph\u00e2n b\u1ed1 v\u00e0 th\u1eddi \u0111i\u1ec3m thu h\u00e1i h\u1ea1t gi\u1ed1ng ph\u1ee5c v\u1ee5 c\u00f4ng t\u00e1c nh\u00e2n gi\u1ed1ng, g\u00e2y tr\u1ed3ng \u0111\u01b0\u1ee3c hi\u1ec7u qu\u1ea3. K\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u \u0111\u00e3 x\u00e1c \u0111\u1ecbnh V\u00e0ng t\u00e2m l\u00e0 c\u00e2y g\u1ed7 l\u1edbn c\u00f3 th\u1ec3 \u0111\u1ea1t chi\u1ec1u cao \u0111\u1ebfn 30 m v\u00e0 \u0111\u01b0\u1eddng k\u00ednh \u0111\u1ebfn 1 m, th\u00e2n tr\u00f2n v\u00e0 th\u1eb3ng; c\u00e0nh non v\u00e0 ch\u1ed3i non c\u00f3 ph\u1ee7 l\u00f4ng m\u0103ng m\u00e0u g\u1ec9 s\u1eaft; l\u00e1 \u0111\u01a1n nguy\u00ean m\u1ecdc \u0111\u1ea7u c\u00e0nh, b\u00fap non c\u00f3 ph\u1ee7 l\u1edbp l\u00f4ng m\u1ecbn v\u00e0ng n\u00e2u, m\u1eb7t d\u01b0\u1edbi l\u00e1 c\u00f3 m\u00e0u x\u00e1m v\u00e0 ph\u1ee7 l\u00f4ng t\u01a1 m\u00e0u v\u00e0ng n\u00e2u th\u01b0a, l\u00e1 k\u00e8m s\u1edbm r\u1ee5ng; hoa l\u01b0\u1ee1ng t\u00ednh, m\u1ecdc \u1edf \u0111\u1ea7u c\u00e0nh, c\u00f3 t\u1eeb 9 – 12 c\u00e1nh tr\u00e0ng, x\u1ebfp xo\u1eafn th\u00e0nh 3 v\u00f2ng, m\u00e0u tr\u1eafng ho\u1eb7c h\u01a1i xanh nh\u1ea1t; qu\u1ea3 \u0111\u1ea1i k\u00e9p, h\u00ecnh tr\u1ee9ng, c\u00f3 cu\u1ed1ng d\u00e0i t\u1eeb 2 – 4,5 cm ph\u1ee7 l\u00f4ng t\u01a1 v\u00e0ng, v\u1ecf n\u1ed5i c\u00e1c m\u1eaft nh\u1ecf, khi ch\u00edn v\u1ecf qu\u1ea3 h\u00f3a g\u1ed7 v\u00e0 chuy\u1ec3n sang m\u00e0u n\u00e2u; th\u1eddi gian ra n\u1ee5 hoa t\u1eeb th\u00e1ng 2 \u0111\u1ebfn th\u00e1ng 4, ra hoa t\u1eeb th\u00e1ng 4 \u0111\u1ebfn th\u00e1ng 5, qu\u1ea3 ch\u00edn t\u1eeb th\u00e1ng 9 \u0111\u1ebfn th\u00e1ng 10 v\u00e0 t\u1eadp trung t\u1eeb gi\u1eefa th\u00e1ng 9 \u0111\u1ebfn gi\u1eefa th\u00e1ng 10 h\u00e0ng n\u0103m; ph\u00e2n b\u1ed1 \u1edf n\u01a1i c\u00f3 \u0111\u1ed9 cao t\u1eeb 650 – 1.250 m so v\u1edbi m\u1eb7t n\u01b0\u1edbc bi\u1ec3n, \u0111\u1ea5t \u1ea9m v\u00e0 c\u00f2n t\u00ednh ch\u1ea5t \u0111\u1ea5t r\u1eebng, kh\u00ed h\u1eadu nhi\u1ec7t \u0111\u1edbi gi\u00f3 m\u00f9a, r\u1eebng th\u1ee9 sinh ph\u1ee5c h\u1ed3i \u1edf t\u1ea7ng gi\u1eefa v\u00e0 tr\u00ean c\u1ee7a t\u00e1n, c\u00f3 \u0111\u1ed9 t\u00e0n che 0,3 – 0,6, c\u00f3 kh\u1ea3 n\u0103ng tr\u1ed3ng thu\u1ea7n lo\u00e0i v\u00e0 tr\u1ed3ng l\u00e0m gi\u00e0u r\u1eebng, c\u00e2y \u01b0a b\u00f3ng giai \u0111o\u1ea1n nh\u1ecf, \u01b0a s\u00e1ng giai \u0111o\u1ea1n tr\u01b0\u1edfng th\u00e0nh.<\/p>\n

T\u1eeb kh\u00f3a:<\/em><\/strong> H\u00ecnh th\u00e1i, sinh th\u00e1i, v\u1eadt h\u1eadu, V\u00e0ng t\u00e2m, S\u01a1n La, L\u00e0o Cai<\/td>\n<\/tr>\n

\n

<\/a>Some morphologi, eclogical, and archeological characteristics of Manglietia dandyi<\/em> Gagnep in Son La, Lao Cai province<\/strong><\/p>\n

Manglietia dandyi<\/em> is a native tree with high economic value. Research on morphological, ecological and phenological features of the treeplay an key important role in determination of the characteristics of the species, it\u2019s distribution and the time of seed collection for effective propagation and planting. Research results show that Manglietia dandyi<\/em> is a large wood species withround and straight trunk, maximum height of 30 m and diameter of up to 1 m; young branches and shoots are covered with rust wooly hairs; simple leaves is at the tips of branches, young buds are covered with yellow-brown hairs, the backside of leaves are gray and covered with yellow-brown hairs, and stipule is deciduous; the tree has white or pale green bisexual flower, growing at the tip of branches, with 9 – 12 corolla petalstwisted in 3 rings, flowering time from April to May; fruit type of Manglietia dandyi<\/em> is a legume with ovate shape, stalk from 2 to 4.5 cm long covered with yellow hairs, the fruit skin is lumpy and it turns into brown and woody as rippen; fruit ripening is from about September to October, focusing on from September 15 to October 15 every year. The distribution of the tree is in the area of tropical monsoon climate, particular in the restored secondary forest with canopy cover 0.3 – 0.6, located at the altitude from 650 – 1250 m, with moist soil closed to characteristic ofthe ones covered with forest. Capable of planting pure species and planting for forest enrichment, shade-loving plants in the small stage, light-loving plants in the adult stage.<\/p>\n

Keywords:<\/em><\/strong> Morphology, ecology, phenology, Manglietia dandyi<\/em>, Son La, Lao Cai<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

<\/a>\u0110\u1eb6C \u0110I\u1ec2M T\u00c1I SINH C\u1ee6A LO\u00c0I HU\u1ef6NH (Tarrietia javanica <\/em>Blume)\u00a0\u1ede V\u00d9NG B\u1eaeC TRUNG B\u1ed8<\/p>\n

<\/a>Ph\u1ea1m Ti\u1ebfn H\u00f9ng1<\/sup>, Ph\u1ea1m Xu\u00e2n \u0110\u1ec9nh1<\/sup>, Nguy\u1ec5n H\u1ea3i H\u00f2a2<\/sup>, V\u0169 \u0110\u1ee9c B\u00ecnh1<\/sup>,
\nNguy\u1ec5n H\u1ea3i Th\u00e0nh1<\/sup>, L\u00ea C\u00f4ng \u0110\u1ecbnh1<\/sup>, Ho\u00e0ng V\u0103n Tu\u1ea5n1<\/sup>, \u0110\u01b0\u1eddng Ng\u1ecdc Danh1<\/sup><\/p>\n

1<\/sup>Trung t\u00e2m Khoa h\u1ecdc L\u00e2m nghi\u1ec7p B\u1eafc Trung B\u1ed9
\n2<\/sup>Tr\u01b0\u1eddng \u0110\u1ea1i h\u1ecdc L\u00e2m nghi\u1ec7p<\/p>\n\n\n\n\n
T\u00d3M T\u1eaeT<\/p>\n

K\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u \u0111\u1eb7c \u0111i\u1ec3m t\u00e1i sinh c\u1ee7a c\u00e2y Hu\u1ef7nh \u1edf m\u1ed9t s\u1ed1 tr\u1ea1ng th\u00e1i r\u1eebng t\u1ef1 nhi\u00ean \u1edf c\u00e1c t\u1ec9nh Qu\u1ea3ng B\u00ecnh v\u00e0 Th\u1eeba Thi\u00ean Hu\u1ebf cho th\u1ea5y, m\u1eadt \u0111\u1ed9 c\u00e2y Hu\u1ef7nh t\u00e1i sinh c\u1ee7a c\u00e1c tr\u1ea1ng th\u00e1i r\u1eebng \u1edf 2 khu v\u1ef1c nghi\u00ean c\u1ee9u dao \u0111\u1ed9ng t\u1eeb 52 – 828 c\u00e2y\/ha, trong \u0111\u00f3 c\u00e2y t\u00e1i sinh c\u00f3 ngu\u1ed3n g\u1ed1c t\u1eeb h\u1ea1t chi\u1ebfm \u01b0u th\u1ebf v\u00e0 \u0111\u1ea1t ch\u1ea5t l\u01b0\u1ee3ng t\u1ed1t \u0111\u1ebfn trung b\u00ecnh. S\u1ed1 lo\u00e0i c\u00e2y t\u00e1i sinh dao \u0111\u1ed9ng t\u1eeb 34 – 52 lo\u00e0i v\u00e0 s\u1ed1 lo\u00e0i c\u00e2y t\u00e1i sinh tham gia v\u00e0o c\u00f4ng th\u1ee9c t\u1ed5 th\u00e0nh dao \u0111\u1ed9ng 2 – 5 lo\u00e0i. Hu\u1ef7nh ph\u1ea7n l\u1edbn t\u00e1i sinh kh\u00f4ng tham gia v\u00e0o c\u00f4ng th\u1ee9c t\u1ed5 th\u00e0nh v\u00e0 c\u00f3 ch\u1ec9 s\u1ed1 Ki% dao \u0111\u1ed9ng t\u1eeb 1,1 – 5,5%. C\u00e2y t\u00e1i sinh c\u1ee7a Hu\u1ef7nh trong c\u00e1c tr\u1ea1ng th\u00e1i r\u1eebng tu\u00e2n theo quy lu\u1eadt \u0111\u00e0o th\u1ea3i t\u1ef1 nhi\u00ean theo ph\u00e2n c\u1ea5p chi\u1ec1u cao v\u00e0 c\u00e2y t\u00e1i sinh tri\u1ec3n v\u1ecdng Hu\u1ef7nh c\u00f3 chi\u1ec1u cao l\u1edbn h\u01a1n 2,1 m trong c\u00e1c tr\u1ea1ng th\u00e1i r\u1eebng chi\u1ebfm t\u1ef7 l\u1ec7 r\u1ea5t \u00edt.<\/p>\n

T\u1eeb kh\u00f3a:<\/em><\/strong> T\u00e1i sinh Hu\u1ef7nh, B\u1eafc Trung B\u1ed9<\/td>\n<\/tr>\n

\n

<\/a>Regenerative characteristics of Tarrietia javanica<\/em> Blume in North Central<\/strong><\/p>\n

The results of regenerative characteristics of Tarrietia javanica<\/em> Blume in natural forest in Quang Binh and Thua Thien Hue showed that the seedling regeneration in 2 provinces ranges from 26 to 213 trees ha-1<\/sup>, most of seedlings regenerated from seeds and had medium to good quality. The regenerated species ranges from 34 to 52 species and the number of seedlings species included in formula of species composition ranged from 2 to 5. Seedlings most of Tarrietia javanica <\/em>Blume did not involved in the dominant species and the IVi% index of Tarrietia javanica <\/em>Blume ranged from 1.1 to 5.5%. Seedlings density of Tarrietia javanica <\/em>Blume varied according to the height and seedlings more than 2.1 m in height was very few in nature forest.<\/p>\n

Keywords:<\/em><\/strong> Regeneration, Tarrietia javanica<\/em> Blume , North Central<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

<\/a>\u0110\u1eb6C \u0110I\u1ec2M C\u1ea4U TR\u00daC M\u1ed8T S\u1ed0 HI\u1ec6N TR\u1ea0NG R\u1eeaNG PH\u1ed4 BI\u1ebeN\u00a0T\u1ea0I HUY\u1ec6N B\u00c1C \u00c1I, T\u1ec8NH NINH THU\u1eacN<\/p>\n

<\/a>Ph\u00f9ng V\u0103n Khen, Nguy\u1ec5n Tr\u1ecdng Nam, L\u00ea Tri\u1ec7u Duy,
\nTr\u1ea7n V\u0103n Nho, B\u00f9i Quang H\u00e0, \u0110o\u00e0n Nh\u1eadt Xinh<\/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

K\u1ebft qu\u1ea3 \u0111i\u1ec1u tra 202 \u00f4 ti\u00eau chu\u1ea9n c\u1ee7a 7 tr\u1ea1ng th\u00e1i r\u1eebng ph\u1ed5 bi\u1ebfn \u1edf huy\u1ec7n B\u00e1c \u00c1i, t\u1ec9nh Ninh Thu\u1eadn cho th\u1ea5y, th\u00e0nh ph\u1ea7n lo\u00e0i c\u00e2y g\u1ed7 trong c\u00e1c tr\u1ea1ng th\u00e1i r\u1eebng t\u01b0\u01a1ng \u0111\u1ed1i phong ph\u00fa v\u1edbi t\u1ed5ng s\u1ed1 131 lo\u00e0i c\u00e2y g\u1ed7 t\u1ea7ng cao v\u00e0 81 lo\u00e0i c\u00e2y g\u1ed7 t\u00e1i sinh. S\u1ed1 lo\u00e0i c\u00e2y ch\u00ednh tham gia v\u00e0o c\u00f4ng th\u1ee9c t\u1ed5 th\u00e0nh \u00edt
\n(5 – 9 lo\u00e0i) v\u00e0 ch\u1ee7 y\u1ebfu l\u00e0 c\u00e1c lo\u00e0i D\u1ebb, C\u1ea9m li\u00ean, D\u1ea7u m\u00edt, C\u0103m xe, C\u00e0 ch\u00ed, S\u1ea7m, C\u00f3c r\u1eebng, K\u00e9, D\u1ea7u \u0111\u1ed3ng, Chi\u00eau li\u00eau, L\u00e0nh ng\u1ea1nh,… nhi\u1ec1u lo\u00e0i c\u00e2y \u01b0a s\u00e1ng, m\u1ecdc nhanh, \u00edt gi\u00e1 tr\u1ecb v\u00e0 ch\u01b0a \u0111\u00e1p \u1ee9ng \u0111\u01b0\u1ee3c m\u1ee5c ti\u00eau v\u1ec1 kinh t\u1ebf. M\u1eadt \u0111\u1ed9 c\u00e2y g\u1ed7 t\u1ea7ng cao th\u1ea5p, bi\u1ebfn \u0111\u1ed9ng t\u1eeb 180 – 750 c\u00e2y\/ha, tr\u1eef l\u01b0\u1ee3ng r\u1eebng bi\u1ebfn \u0111\u1ed9ng t\u1eeb 5,78 m3<\/sup>\/ha (RLP) \u0111\u1ebfn 133,38 m3<\/sup>\/ha (RLB), s\u1ed1 c\u00e2y v\u00e0 tr\u1eef l\u01b0\u1ee3ng r\u1eebng t\u1eadp trung nhi\u1ec1u t\u1ea1i c\u00e1c c\u1ea5p \u0111\u01b0\u1eddng k\u00ednh nh\u1ecf (D1,3<\/sub> d\u01b0\u1edbi 18 cm) bi\u1ebfn \u0111\u1ed9ng t\u1eeb 52,5% (RLB) \u0111\u1ebfn 96,8% (RLP). M\u1eadt \u0111\u1ed9 c\u00e2y t\u00e1i sinh b\u00ecnh qu\u00e2n l\u00e0 1.340 c\u00e2y\/ha, bi\u1ebfn \u0111\u1ed9ng th\u1ea5p nh\u1ea5t 600 c\u00e2y\/ha (tr\u1ea1ng th\u00e1i TXN) v\u00e0 cao nh\u1ea5t 2.675 c\u00e2y\/ha (tr\u1ea1ng th\u00e1i RLP), c\u00e2y t\u00e1i sinh c\u00f3 tri\u1ec3n v\u1ecdng 305 c\u00e2y\/ha (chi\u1ebfm 28,0% c\u00e2y t\u00e1i sinh). T\u1ef7 l\u1ec7 c\u00e2y t\u00e1i sinh ch\u1ed3i 33,1%, t\u00e1i sinh h\u1ea1t 66,9%. C\u00e2y c\u00f3 ph\u1ea9m ch\u1ea5t t\u1ed1t chi\u1ebfm (13,4%), trung b\u00ecnh (70,1%) v\u00e0 ph\u1ea9m ch\u1ea5t x\u1ea5u (16,5%). S\u1ed1 l\u01b0\u1ee3ng lo\u00e0i c\u00e2y t\u00e1i sinh bi\u1ebfn \u0111\u1ed9ng t\u1eeb 19 lo\u00e0i \u0111\u1ebfn 54 lo\u00e0i, trong \u0111\u00f3 5 – 7 lo\u00e0i tham gia v\u00e0o c\u00f4ng th\u1ee9c t\u1ed5 th\u00e0nh. Ph\u1ea7n l\u1edbn c\u00e2y t\u1ea7ng cao c\u00f3 m\u1eb7t \u1edf l\u1edbp c\u00e2y t\u00e1i sinh, do \u0111\u00f3 trong t\u01b0\u01a1ng lai t\u1ed5 th\u00e0nh c\u1ee7a r\u1eebng s\u1ebd ch\u01b0a c\u00f3 s\u1ef1 thay \u0111\u1ed5i r\u00f5 r\u1ec7t v\u1ec1 th\u00e0nh ph\u1ea7n lo\u00e0i.<\/p>\n

T\u1eeb kh\u00f3a:<\/em><\/strong> R\u1eebng B\u00e1c \u00c1i, c\u1ea5u tr\u00fac t\u1ed5 th\u00e0nh lo\u00e0i, t\u00e1i sinh t\u1ef1 nhi\u00ean, r\u1eebng t\u1ef1 nhi\u00ean<\/td>\n<\/tr>\n

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<\/a>Structural characteristics of some common forest status in Bac Ai district, Ninh Thuan province<\/strong><\/p>\n

The survey results of 202 standard plots of 7 common forest estates in Bac Ai district, Ninh Thuan province showed that woody species composition was particularly diverse comprising 131 dominant species and 81 regenerated species. The main species involved in the species community formula were few (5 – 9 species) including: Quercus platycalyx<\/em>, Shorea siamensis<\/em> Miq, Dipterocarpus costatus<\/em> Gaertn, Xilya dolabriformis<\/em> Benth, Shorea obtusa<\/em> Wall, Fraxinus chinensis<\/em>, Spondiaspinata<\/em> Kurz, Nephelium <\/em>sp., Dipterocarpus tuberculatus<\/em>, Terminalia bellirica<\/em>, Cratoxylon formosum<\/em> B.et H,.. There were many species of light-demanding, fast-growing, low economic value due to they were not beneficial aspects. Density of domiant species was low and varied from 180 trees\/ha to 750 trees\/ha, stand volumes were from 5.78 m3<\/sup>\/ha (RLP) to 133.38 m3<\/sup>\/ha (RLB); stand density was concentrated mainly small diameter class (D1,3<\/sub> < 18 cm) ranging from the lowest 52.5% (RLB) to 96.8% (RLP). The average density of regenerated trees was 1,340 trees\/ha, the lowest density was 600 trees\/ha (TXN status) and the highest density was 2,675 trees\/ha (RLP status), promising regeneration distributed 305 trees\/ha (accounted for 28.0% of regenerated spacies). The rate of tree regeneration by shoots was 33.1%, and seed regeneration was 66.9%. Trees with good quality accounted for (13.4%), medium (70.1%) and bad quality (16.5%). The number of regenerative tree species varied from 19 species to 54 species, of which 5 – 7 species involved in the species community formula. Most of the dominant trees were presented on the regenerative species community leading to composition of the forest will not changed clearly in species composition in the futute.<\/p>\n

Keywords:<\/em><\/strong> Forest types of Bac Ai district, species composition structure, natural regeneration, natural forest status\u00a0<\/em><\/strong><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

<\/a>HI\u1ec6N TR\u1ea0NG PH\u00c2N B\u1ed0 V\u00c0 \u0110\u1eb6C \u0110I\u1ec2M L\u00c2M H\u1eccC\u00a0LO\u00c0I HO\u00c0NG \u0110\u00c0N GI\u1ea2 (Dacrydium elatum<\/em> (Roxb.) Wall)\u00a0T\u1ea0I R\u1eeaNG QU\u1ed0C GIA Y\u00caN T\u1eec, QU\u1ea2NG NINH<\/p>\n

<\/a>La \u00c1nh D\u01b0\u01a1ng1<\/sup>, Ho\u00e0ng Thanh S\u01a1n2<\/sup>, Do\u00e3n Ho\u00e0ng S\u01a1n1<\/sup>,
\nTr\u1ecbnh V\u0103n Hi\u1ec7u1<\/sup>, H\u00e0 Huy Nh\u1eadt1<\/sup><\/p>\n

1<\/sup>Vi\u1ec7n Nghi\u00ean c\u1ee9u Gi\u1ed1ng v\u00e0 C\u00f4ng ngh\u1ec7 sinh h\u1ecdc L\u00e2m nghi\u1ec7p,
\n2<\/sup>Vi\u1ec7n Nghi\u00ean c\u1ee9u L\u00e2m sinh<\/p>\n\n\n\n\n
T\u00d3M T\u1eaeT<\/p>\n

C\u00e2y Ho\u00e0ng \u0111\u00e0n gi\u1ea3 hay c\u00f2n g\u1ecdi l\u00e0 H\u1ed3ng t\u00f9ng (Dacrydium elatum<\/em> (Roxb.) Wall) thu\u1ed9c h\u1ecd Kim giao (Podocarpaceae), \u0111\u00e2y l\u00e0 lo\u00e0i c\u00e2y g\u1ed7 qu\u00fd hi\u1ebfm, g\u1ed7 c\u00f3 t\u00ednh ch\u1ea5t t\u1ed1t, m\u1ecbn, th\u1edb th\u1eb3ng, \u0111\u1eb9p, h\u01a1i c\u1ee9ng, n\u1eb7ng trung b\u00ecnh v\u00e0 n\u1eb1m trong nh\u00f3m II theo TCVN 12919 – 2 n\u0103m 2019. B\u00e0i b\u00e1o nh\u1eb1m m\u1ee5c \u0111\u00edch cung c\u1ea5p th\u00f4ng tin khoa h\u1ecdc v\u1ec1 hi\u1ec7n tr\u1ea1ng ph\u00e2n b\u1ed1, m\u1ed9t s\u1ed1 \u0111\u1eb7c \u0111i\u1ec3m l\u00e2m h\u1ecdc c\u1ee7a c\u00e2y Ho\u00e0ng \u0111\u00e0n gi\u1ea3 t\u1ea1i R\u1eebng Qu\u1ed1c gia Y\u00ean T\u1eed, t\u1ec9nh Qu\u1ea3ng Ninh. C\u00e2y Ho\u00e0ng \u0111\u00e0n gi\u1ea3 ph\u00e2n b\u1ed1 \u1edf nh\u1eefng v\u00f9ng c\u00f3 \u0111\u1ed9 cao t\u1eeb 400 – 500 m so v\u1edbi m\u1ef1c n\u01b0\u1edbc bi\u1ec3n. Qua \u0111i\u1ec1u tra c\u00e1c tuy\u1ebfn t\u1ea1i R\u1eebng Qu\u1ed1c gia Y\u00ean T\u1eed \u0111\u00e3 thi\u1ebft l\u1eadp \u0111\u01b0\u1ee3c 03 \u00f4 ti\u00eau chu\u1ea9n (OTC) ghi nh\u1eadn s\u1ef1 xu\u1ea5t hi\u1ec7n c\u1ee7a c\u00e2y Ho\u00e0ng \u0111\u00e0n gi\u1ea3 trong t\u1ef1 nhi\u00ean. M\u1eadt \u0111\u1ed9 t\u1ea7ng c\u00e2y cao c\u1ee7a l\u00e2m ph\u1ea7n dao \u0111\u1ed9ng t\u1eeb 305 c\u00e2y\/ha \u0111\u1ebfn 375 c\u00e2y\/ha, \u0111\u01b0\u1eddng k\u00ednh D1,3<\/sub> trung b\u00ecnh c\u00f3 s\u1ef1 thay \u0111\u1ed5i kh\u00f4ng l\u1edbn t\u1eeb 20,5 – 24,2 cm, chi\u1ec1u cao v\u00fat ng\u1ecdn trung b\u00ecnh t\u1eeb 12,3 – 17,1 m. C\u00e2y Ho\u00e0ng \u0111\u00e0n gi\u1ea3 c\u00f3 m\u1eadt \u0111\u1ed9 \u0111\u1ea1t t\u1eeb 10 – 30 c\u00e2y\/ha v\u00e0 ch\u1ec9 tham gia v\u00e0o c\u00f4ng th\u1ee9c t\u1ed5 th\u00e0nh t\u1ea7ng c\u00e2y t\u1ea1i l\u00e2m ph\u1ea7n th\u1ee9 2 (OTC QN2). M\u1eadt \u0111\u1ed9 c\u00e2y t\u00e1i sinh c\u1ee7a l\u00e2m ph\u1ea7n t\u1eeb 2.400 \u0111\u1ebfn 3.920 c\u00e2y\/ha. Ch\u1ea5t l\u01b0\u1ee3ng c\u00e2y t\u00e1i sinh c\u1ee7a l\u00e2m ph\u1ea7n h\u1ea7u h\u1ebft t\u1ed1t v\u1edbi t\u1ef7 l\u1ec7 cao nh\u1ea5t t\u1ea1i OTC QN1 v\u1edbi 77,1%. Ho\u00e0ng \u0111\u00e0n gi\u1ea3 ch\u1ee7 y\u1ebfu l\u00e0 t\u00e1i sinh h\u1ea1t, ch\u1ea5t l\u01b0\u1ee3ng c\u00e2y t\u1ed1t v\u00e0 t\u00e1i sinh ch\u1ee7 y\u1ebfu l\u00e0 \u1edf c\u1ea5p chi\u1ec1u cao l\u1edbn h\u01a1n 100 cm. Do c\u00e2y Ho\u00e0ng \u0111\u00e0n gi\u1ea3 t\u00e1i sinh t\u1ea1i Qu\u1ea3ng Ninh c\u00f3 m\u1eadt \u0111\u1ed9 th\u1ea5p n\u00ean d\u1eabn \u0111\u1ebfn nguy c\u01a1 suy gi\u1ea3m s\u1ed1 l\u01b0\u1ee3ng c\u00e2y Ho\u00e0ng \u0111\u00e0n gi\u1ea3 tr\u01b0\u1edfng th\u00e0nh trong t\u01b0\u01a1ng lai. V\u00ec v\u1eady, c\u00e1c gi\u1ea3i ph\u00e1p b\u1ea3o t\u1ed3n v\u00e0 x\u00fac ti\u1ebfn t\u00e1i sinh c\u00e2y Ho\u00e0ng \u0111\u00e0n gi\u1ea3 l\u00e0 c\u1ea7n thi\u1ebft \u1edf R\u1eebng Qu\u1ed1c gia Y\u00ean T\u1eed.<\/p>\n

T\u1eeb kh\u00f3a:<\/em><\/strong> B\u1ea3o t\u1ed3n, R\u1eebng Qu\u1ed1c gia Y\u00ean T\u1eed, Ho\u00e0ng \u0111\u00e0n gi\u1ea3, <\/em>ph\u00e2n b\u1ed1, \u0111\u1eb7c \u0111i\u1ec3m l\u00e2m h\u1ecdc<\/td>\n<\/tr>\n

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<\/a>The distribution status and silvicultural characteristics of Dacrydium elatum<\/em> (Roxb.) Wall in Yen Tu\u00a0National\u00a0Forests, Quang Ninh province<\/strong><\/p>\n

Dacrydium elatum<\/em> (Roxb.) Wall belongs to Podocarpaceae family, this is a rare species of wood, the wood has good properties, smooth, straight grain, beautiful, slightly hard, medium weight and in group II according to TCVN 12919 – 2 in 2019. The article aims to provide scientific information on the distribution status and some silvicultural of D.elatum<\/em> in Yen Tu\u00a0National\u00a0Forests, Quang Ninh province. D.elatum<\/em> is distributed in areas with altitude from 400 to 500 m. Through investigation of routes in Yen Tu\u00a0National\u00a0Forests, 03 OTCs have been established to record the occurrence of D.elatum<\/em> in nature. The density of tall trees of the stand ranged from 305 – 375 trees\/ha, the average diameter at breast height did not change much from 20.5 – 24.2 cm, the average height was from
\n12.3 – 17.1 m. D.elatum<\/em> had a density of 10 trees\/ha to 30 trees\/ha and only participates in the formula for tree stratification in the second stand (OTC QN2). The density of regenerated trees of the stand was only from 2,400 – 3,920 trees\/ha. The quality of regenerated trees of the stand was mostly good with the highest rate at OTC QN1 with 77.1%. D.elatum<\/em> was mainly regenerated by seeds, had good quality, and regenerates mainly at the height of more than 100 cm. Due to the low density of regenerating D.elatum<\/em> in Quang Ninh, it leads to the risk of reducing the number of mature D.elatum<\/em> in the future. Therefore, solutions to preserve and promote the regeneration of D.elatum<\/em> are necessary in Yen Tu\u00a0National\u00a0Forests.<\/p>\n

Keywords:<\/em><\/strong> Conservation, Yen Tu\u00a0National\u00a0Forests, Dacrydium elatum<\/em> (Roxb.) Wall, distribution, silvicultural characteristics<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

<\/a>SINH KH\u1ed0I R\u1eeaNG TR\u1ed2NG KEO LAI THEO TU\u1ed4I V\u00c0 C\u1ea4P \u0110\u1ea4T\u00a0T\u1ea0I Y\u00caN B\u00c1I<\/p>\n

<\/a>Nguy\u1ec5n V\u0103n B\u00edch, H\u00e0 Th\u1ecb Mai, V\u00f5 \u0110\u1ea1i H\u1ea3i<\/p>\n

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 \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n t\u1ea1i hai huy\u1ec7n L\u1ee5c Y\u00ean v\u00e0 Y\u00ean B\u00ecnh t\u1ec9nh Y\u00ean B\u00e1i nh\u1eb1m x\u00e1c \u0111\u1ecbnh \u0111\u1eb7c \u0111i\u1ec3m sinh kh\u1ed1i c\u1ee7a r\u1eebng tr\u1ed3ng keo lai (Acacia auriculiformis <\/em>\u00b4 Acacia mangium<\/em>) theo tu\u1ed5i v\u00e0 c\u1ea5p \u0111\u1ea5t. T\u1ed5ng c\u1ed9ng 56 \u00f4 ti\u00eau chu\u1ea9n \u0111i\u1ec3n h\u00ecnh 500 m2<\/sup> (20 \u00b4 25 m), 280 \u00f4 th\u1ee9 c\u1ea5p 16 m2<\/sup> (4 \u00b4 4 m) v\u00e0 280 \u00f4 d\u1ea1ng b\u1ea3n 1 m2<\/sup> (1 \u00b4 1 m) \u0111\u00e3 \u0111\u01b0\u1ee3c thi\u1ebft l\u1eadp \u0111\u1ec3 \u0111o \u0111\u1ebfm sinh tr\u01b0\u1edfng t\u1ea7ng c\u00e2y cao, x\u00e1c \u0111\u1ecbnh sinh kh\u1ed1i c\u00e2y b\u1ee5i th\u1ea3m t\u01b0\u01a1i v\u00e0 v\u1eadt r\u01a1i r\u1ee5ng c\u1ee7a r\u1eebng tr\u1ed3ng keo lai. Theo \u0111\u00f3, 56 c\u00e2y ti\u00eau chu\u1ea9n \u0111\u00e3 \u0111\u01b0\u1ee3c ch\u1eb7t h\u1ea1 \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh sinh kh\u1ed1i t\u1eebng b\u1ed9 ph\u1eadn c\u1ee7a c\u00e2y c\u00e1 th\u1ec3, bao g\u1ed3m th\u00e2n, c\u00e0nh, l\u00e1, v\u1ecf v\u00e0 r\u1ec5 c\u00e2y. K\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u cho th\u1ea5y, gi\u1eefa sinh kh\u1ed1i kh\u00f4 c\u00e2y c\u00e1 th\u1ec3 keo lai v\u00e0 \u0111\u01b0\u1eddng k\u00ednh ngang ng\u1ef1c (D1,3<\/sub>) c\u00f3 s\u1ef1 t\u01b0\u01a1ng quan r\u1ea5t ch\u1eb7t, theo \u0111\u00f3, d\u1ea1ng h\u00e0m Power (Y = a \u00b4 X^b) \u0111\u01b0\u1ee3c ch\u1ecdn l\u00e0 d\u1ea1ng h\u00e0m m\u00f4 ph\u1ecfng t\u1ed1t nh\u1ea5t \u0111\u1ec3 s\u1eed d\u1ee5ng t\u00ednh to\u00e1n \u01b0\u1edbc l\u01b0\u1ee3ng sinh kh\u1ed1i kh\u00f4 c\u1ee7a t\u1ea7ng c\u00e2y cao trong l\u00e2m ph\u1ea7n keo lai. T\u1ed5ng sinh kh\u1ed1i kh\u00f4 c\u00e2y c\u00e1 th\u1ec3 keo lai dao \u0111\u1ed9ng t\u1eeb 3 – 105 kg\/c\u00e2y t\u01b0\u01a1ng \u1ee9ng v\u1edbi tu\u1ed5i 1 – 7 \u1edf c\u1ea5p \u0111\u1ea5t I; 1,8 – 67 kg\/c\u00e2y \u1edf c\u1ea5p \u0111\u1ea5t II; 1 – 56 kg\/c\u00e2y \u1edf c\u1ea5p \u0111\u1ea5t III; v\u00e0 0,7 – 35,2 kg\/c\u00e2y \u1edf c\u1ea5p \u0111\u1ea5t IV. T\u00ednh trung b\u00ecnh cho c\u1ea3 4 c\u1ea5p \u0111\u1ea5t th\u00ec sinh kh\u1ed1i c\u00e2y c\u1ea3 th\u1ec3 keo lai t\u1eadp trung ch\u1ee7 y\u1ebfu t\u1ea1i ph\u1ea7n th\u00e2n c\u00e2y (chi\u1ebfm 46,37%), ti\u1ebfp \u0111\u1ebfn l\u00e0 \u1edf ph\u1ea7n r\u1ec5 c\u00e2y (chi\u1ebfm 18,6%), c\u00e0nh c\u00e2y (chi\u1ebfm 16,4%), l\u00e1 c\u00e2y (chi\u1ebfm 13,1%) v\u00e0 th\u1ea5p nh\u1ea5t l\u00e0 trong v\u1ecf c\u00e2y (chi\u1ebfm 5,6%). T\u1ed5ng sinh kh\u1ed1i kh\u00f4 c\u1ee7a l\u00e2m ph\u1ea7n keo lai dao \u0111\u1ed9ng t\u1eeb 8,9 – 138,1 t\u1ea5n\/ha, t\u01b0\u01a1ng \u0111\u01b0\u01a1ng v\u1edbi tu\u1ed5i 1 – 7 \u1edf c\u1ea5p \u0111\u1ea5t I; t\u1eeb 9,6 – 93,3 t\u1ea5n\/ha \u1edf c\u1ea5p \u0111\u1ea5t II; t\u1eeb 4,1 – 76,5 t\u1ea5n\/ha \u1edf c\u1ea5p \u0111\u1ea5t III; v\u00e0 t\u1eeb 7,7 – 50,1 t\u1ea5n\/ha \u1edf c\u1ea5p \u0111\u1ea5t IV. Trong \u0111\u00f3, sinh kh\u1ed1i t\u1eadp trung ch\u1ee7 y\u1ebfu \u1edf t\u1ea7ng c\u00e2y cao – c\u00e2y keo lai (chi\u1ebfm trung b\u00ecnh 76,5%), ti\u1ebfp \u0111\u1ebfn l\u00e0 v\u1eadt r\u01a1i r\u1ee5ng + th\u00e2n m\u1ee5c (chi\u1ebfm 14,5%) v\u00e0 th\u1ea5p nh\u1ea5t l\u00e0 trong c\u00e2y b\u1ee5i th\u1ea3m t\u01b0\u01a1i (chi\u1ebfm 9%) t\u1ed5ng sinh kh\u1ed1i c\u1ee7a to\u00e0n l\u00e2m ph\u1ea7n.<\/p>\n

T\u1eeb kh\u00f3a:<\/em><\/strong> Keo lai, \u00a0sinh kh\u1ed1i, c\u1ea5p \u0111\u1ea5t, n\u0103ng su\u1ea5t r\u1eebng<\/td>\n<\/tr>\n

\n

<\/a>Biomass accumulation of acacia hybrid plantation across ages and site indexes in Yen Bai province, Vietnam<\/strong><\/p>\n

The study was conducted in two districts of Luc Yen and Yen Binh, Yen Bai province to determine the biomass characteristics of Acacia hybrid (Acacia auriculiformis <\/em>\u00b4 Acacia mangium<\/em>) plantations across ages and site indexes. A total of 56 representative plots of 500 m2<\/sup> (20 \u00b4 25 m), 280 sub-plots of 16 m2<\/sup> (4 \u00b4 4 m) and 280 basic plots of 1 m2<\/sup> (1 \u00b4 1 m) were established to measure growth of all trees, determination of biomass of understory vegetation and litter fall (including dead wood) of Acacia hybrid plantations. Accordingly, 56 sample trees were destructed to determine the biomass of each tree components of the individual tree, including stem, branches, leaves, bark, and roots. Research results show that there is a very close correlation between dry biomass of Acacia hybrid individual trees and its DBH (D1.3<\/sub>), in which, the Power function (Y = a \u00b4 X^b) is the best form of simulation function to use for estimating dry biomass of Acacia hybrid trees. Total dry biomass of individual Acacia hybrid trees ranges from 3 to 105 kg\/tree, corresponding to the age of 1 – 7 in site index I; 1.8 – 67 kg\/tree in soil index II; 1 – 56 kg\/tree in soil index III; and 0.7 – 35.2 kg\/tree in soil index IV. On average for all 4 soil indexes, the biomass of Acacia hybrid trees concentrated mainly in the stem (accounting for 46.37%), followed by the roots (accounting for 18.6%), branches (accounting for 16.4%), leaves (13.1%) and the lowest in bark (5.6%). Total dry biomass of Acacia hybrid entire stand ranged from 8.9 to 138.1 tons\/ha, equivalent to age 1 – 7 in soil index I; from 9.6 to 93.3 tons\/ha in soil index II; from 4.1 to 76.5 tons\/ha in soil index III; and from 7.7 to 50.1 tons\/ha in soil index IV. In which, biomass is concentrated mainly in the high tree layer – Acacia hybrid (average 76.5%), followed by litter fall + dead wood (14.5%) and the lowest is in understory vegetation (accounting for 9%) of the total biomass of the entire stand.\u2019<\/p>\n

Keywords:<\/em><\/strong>Acacia <\/em>hybrid<\/em> (Acacia auriculiformis <\/em>\u00b4 Acacia mangium)<\/em>, biomass, site indexes, productivity<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

<\/a>NH\u1eacN BI\u1ebeT NHANH G\u1ed6 C\u1ee6A M\u1ed8T S\u1ed0 LO\u00c0I C\u00c2Y V\u01af\u1edcN \u1ede VI\u1ec6T NAM B\u1eb0NG C\u1ea4U T\u1ea0O TH\u00d4 \u0110\u1ea0I<\/p>\n

<\/a>B\u00f9i H\u1eefu Th\u01b0\u1edfng, L\u01b0u Qu\u1ed1c Th\u00e0nh, V\u0169 Th\u1ecb H\u1ed3ng Th\u1eafm,
\nV\u0169 Th\u1ecb Ngoan, H\u00e0 Ti\u1ebfn M\u1ea1nh, Tr\u1ea7n \u0110\u1ee9c Trung<\/p>\n

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

M\u1ed9t s\u1ed1 lo\u00e0i c\u00e2y v\u01b0\u1eddn nh\u01b0 Xo\u00e0i (Mangifera indica<\/em>), S\u1ea5u (Dracontomelon duperreanum<\/em>), D\u00e2u gia xoan (Allospondias lakonensis<\/em>), M\u00edt (Artocarpus heterophyllus<\/em>), V\u1ea3i (Litchi chinensis<\/em>), Nh\u00e3n (Dimocarpus longan<\/em>),… ngo\u00e0i vi\u1ec7c cho qu\u1ea3 c\u00f2n l\u00e0 ngu\u1ed3n cung c\u1ea5p g\u1ed7 trong x\u00e2y d\u1ef1ng, l\u00e0m \u0111\u1ed3 m\u1ed9c th\u00f4ng th\u01b0\u1eddng th\u1eadm ch\u00ed c\u1ea3 \u0111\u1ed3 m\u1ed9c m\u1ef9 ngh\u1ec7 v\u00e0 \u0111i\u1ec1u n\u00e0y c\u0169ng l\u00e0m t\u0103ng nhu c\u1ea7u\u00a0 v\u1ec1 nh\u1eadn bi\u1ebft nhanh g\u1ed7 nh\u1eefng lo\u00e0i n\u00eau tr\u00ean b\u1eb1ng c\u1ea5u t\u1ea1o th\u00f4 \u0111\u1ea1i. Tham kh\u1ea3o m\u1ed9t s\u1ed1 t\u00e0i li\u1ec7u m\u00f4 t\u1ea3 c\u1ea5u t\u1ea1o g\u1ed7 \u0111\u00e3 c\u00f4ng b\u1ed1, quan s\u00e1t m\u1eabu g\u1ed7 l\u01b0u tr\u1eef \u0111\u1ec3 ki\u1ec3m tra l\u1ea1i hay m\u00f4 t\u1ea3 m\u1edbi (\u0111\u1ed1i v\u1edbi nh\u1eefng lo\u1ea1i g\u1ed7 ch\u01b0a \u0111\u01b0\u1ee3c m\u00f4 t\u1ea3), \u0111\u1ed3ng th\u1eddi ti\u1ebfn h\u00e0nh ch\u1ee5p \u1ea3nh c\u1ea5u t\u1ea1o g\u1ed7, ch\u00fang t\u00f4i gi\u1edbi thi\u1ec7u t\u00e0i li\u1ec7u nh\u1eadn bi\u1ebft nhanh 6 lo\u1ea1i g\u1ed7 v\u01b0\u1eddn n\u00eau tr\u00ean. C\u00e1c \u0111\u1eb7c \u0111i\u1ec3m c\u1ea5u t\u1ea1o \u0111\u1eb7c tr\u01b0ng nh\u1ea5t c\u1ee7a m\u1ed7i lo\u1ea1i g\u1ed7 nh\u01b0 sau: G\u1ed7 Xo\u00e0i: m\u1ea1ch \u0111\u01a1n v\u00e0 k\u00e9p ng\u1eafn, ph\u00e2n t\u00e1n; m\u00f4 m\u1ec1m bao quanh m\u1ea1ch h\u00ecnh c\u00e1nh, c\u00e1nh n\u1ed1i ti\u1ebfp, c\u00f3 th\u1ec3 b\u00edt d\u1ea1ng m\u00e0ng m\u1ecfng; m\u00f4 m\u1ec1m th\u00e0nh d\u1ea3i t\u1eadn c\u00f9ng v\u00e0 d\u1ea3i h\u1eb9p gi\u00e1n \u0111o\u1ea1n; G\u1ed7 S\u1ea5u: m\u1ea1ch \u0111\u01a1n v\u00e0 k\u00e9p ng\u1eafn (3 – 4 m\u1ea1ch), ph\u00e2n t\u00e1n, th\u01b0\u1eddng c\u00f3 th\u1ec3 b\u00edt d\u1ea1ng m\u00e0ng m\u1ecfng. G\u1ed7 D\u00e2u gia xoan: m\u1ea1ch \u0111\u01a1n v\u00e0 k\u00e9p ng\u1eafn, ph\u00e2n t\u00e1n ho\u1eb7c x\u1ebfp n\u1eeda v\u00f2ng m\u1ea1ch, \u0111\u00f4i khi c\u00f3 nh\u1eefng nh\u00f3m m\u1ea1ch nh\u1ecf \u1edf cu\u1ed1i v\u00f9ng g\u1ed7 mu\u1ed9n. G\u1ed7 M\u00edt: m\u00e0u v\u00e0ng \u0111\u1eb7c tr\u01b0ng, m\u1ea1ch \u0111\u01a1n v\u00e0 k\u00e9p ng\u1eafn ph\u00e2n t\u00e1n, th\u01b0\u1eddng c\u00f3 ch\u1ea5t ch\u1ee9a m\u00e0u tr\u1eafng, m\u00f4 m\u1ec1m bao quanh m\u1ea1ch h\u00ecnh c\u00e1nh v\u00e0 h\u00ecnh c\u00e1nh n\u1ed1i ti\u1ebfp. G\u1ed7 Nh\u00e3n: m\u1ea1ch \u0111\u01a1n v\u00e0 k\u00e9p ng\u1eafn ph\u00e2n t\u00e1n ho\u1eb7c x\u1ebfp n\u1eeda v\u00f2ng, m\u1eb7t g\u1ed7 m\u1ecbn. G\u1ed7 V\u1ea3i: m\u00e0u n\u00e2u h\u1ed3ng \u0111\u1eb7c tr\u01b0ng, m\u1ea1ch \u0111\u01a1n v\u00e0 k\u00e9p ng\u1eafn ph\u00e2n t\u00e1n, th\u01b0\u1eddng c\u00f3 ch\u1ea5t ch\u1ee9a m\u00e0u tr\u1eafng, m\u1eb7t g\u1ed7 m\u1ecbn.<\/p>\n

T\u1eeb kh\u00f3a:<\/em><\/strong> C\u1ea5u t\u1ea1o g\u1ed7, c\u00e2y v\u01b0\u1eddn, Xo\u00e0i, S\u1ea5u, D\u00e2u gia xoan, M\u00edt, V\u1ea3i, Nh\u00e3n<\/td>\n<\/tr>\n

\n

<\/a>Rapit identification of wood of garden species in Vietnam by macroscopic features<\/strong><\/p>\n

Some species of garden trees such as Mango (Mangifera indica<\/em>), Sau (Dracontomelon duperreanum<\/em>), Dau gia xoan (Allospondias lakonensis<\/em>), Jackfruit (Artocarpus heterophyllus<\/em>), Litchi (Litchi chinensis<\/em>), Longan (Dimocarpus longan<\/em>), in addition to fruiting, are also a source of wood that is currently used in construction, common woodworking and even fine art furniture and that is why there is a need for quick identification of the above species by macroscopic features of wood. Refer to a number of published wood structure description documents, observe the archived wood samples for re-examination or new description (for undescribed wood species), and take photos of the wood structure, we introduce documents to quickly identify 6 wood species of garden plants mentioned above. The most characteristic structural features of each wood species are as follows: Wood of Mango: vessels solitary and in multiples, axial parenchyma aliform, confluent, tyloses sclerotic, axial parenchyma banded and in narrow bands. Wood of Sau: Vessels solitary and multiples (to 3 vessels, rare to 4 vessels); tyloses sclerotic. Wood of Dau gia xoan: vessels solitary and multiples or semi-ring-porous, sometimes small vessels group at the end of the late wood. Wood of Jackfruit: basically light yellowish, vessels solitary and multiples, white deposits in vessels, axial parenchyma aliform, confluent. Wood of Longan: vessels solitary and multiples or semi-ring-porous, wood surface smooth. Wood of Litchi: pink brown, vessels solitary and multiples; white deposits in vessels; wood surface smooth.<\/p>\n

Keywords:<\/em><\/strong>Wood structures, garden tree, Mango, Sau, Dau gia xoan, Jackfrut, Litchi, Longan<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

<\/a>X\u00c1C \u0110\u1ecaNH TH\u00d4NG S\u1ed0 C\u00d4NG NGH\u1ec6 \u00c9P PH\u1ee6 M\u1eb6T\u00a0V\u00c1N L\u1ea0NG G\u1ed6 S\u1ed2I \u0110\u1ece L\u00caN B\u1ec0 M\u1eb6T V\u00c1N GH\u00c9P THANH G\u1ed6 KEO LAI<\/p>\n

<\/a>T\u1ea1 Th\u1ecb Thanh H\u01b0\u01a1ng1<\/sup>, Nguy\u1ec5n V\u0103n \u0110\u1ecbnh1<\/sup>, Ng\u00f4 Trung S\u01a1n2<\/sup>,
\nNguy\u1ec5n \u0110\u1ee9c Th\u00e0nh1<\/sup>, Nguy\u1ec5n Thanh T\u00f9ng1<\/sup><\/p>\n

1<\/sup>Vi\u1ec7n Nghi\u00ean c\u1ee9u C\u00f4ng nghi\u1ec7p r\u1eebng
\n2<\/sup>C\u00f4ng ty C\u1ed5 ph\u1ea7n Ph\u00e1t tri\u1ec3n X\u00edn M\u1ea7n<\/p>\n\n\n\n\n
T\u00d3M T\u1eaeT<\/p>\n

C\u00f4ng ngh\u1ec7 \u00e9p ph\u1ee7 l\u00e0 kh\u00e2u thi\u1ebft y\u1ebfu trong qu\u00e1 tr\u00ecnh s\u1ea3n xu\u1ea5t s\u1ea3n ph\u1ea9m v\u00e1n ph\u1ee7 m\u1eb7t. Kh\u1ea3 n\u0103ng d\u00e1n d\u00ednh gi\u1eefa b\u1ec1 m\u1eb7t v\u00e1n nh\u00e2n t\u1ea1o v\u1edbi l\u1edbp ph\u1ee7 m\u1eb7t b\u1ecb \u1ea3nh h\u01b0\u1edfng b\u1edfi nhi\u1ec1u y\u1ebfu t\u1ed1 nh\u01b0: Th\u00f4ng s\u1ed1 c\u00f4ng ngh\u1ec7 \u00e9p (\u00e1p su\u1ea5t, th\u1eddi gian, nhi\u1ec7t \u0111\u1ed9), \u0111\u1eb7c t\u00ednh c\u1ee7a keo d\u00e1n, \u0111\u1eb7c t\u00ednh b\u1ec1 m\u1eb7t c\u1ee7a t\u1eebng lo\u1ea1i ch\u1ea5t ph\u1ee7 v\u00e0 lo\u1ea1i c\u1ed1t\/n\u1ec1n v\u00e1n nh\u00e2n t\u1ea1o. Nghi\u00ean c\u1ee9u n\u00e0y \u0111\u00e3 x\u00e1c \u0111\u1ecbnh \u0111\u01b0\u1ee3c th\u00f4ng s\u1ed1 c\u00f4ng ngh\u1ec7 \u00e9p ph\u1ee7 m\u1eb7t (c\u1ea3 hai m\u1eb7t) v\u00e1n gh\u00e9p thanh g\u1ed7 keo lai (chi\u1ec1u d\u00e0y 12 mm) b\u1eb1ng v\u00e1n l\u1ea1ng g\u1ed7 S\u1ed3i \u0111\u1ecf (chi\u1ec1u d\u00e0y 0,4 mm), s\u1eed d\u1ee5ng ch\u1ea5t k\u1ebft d\u00ednh Melamine urea formaldehyde (MUF) l\u00e0 P = 0,7 MPa; T = 115o<\/sup>C; \u03c4 = 3 ph\u00fat, cho k\u1ebft qu\u1ea3 \u0111\u1ed9 b\u1ec1n u\u1ed1n t\u0129nh (MOR) v\u00e0 m\u00f4 \u0111un \u0111\u00e0n h\u1ed3i khi u\u1ed1n t\u0129nh (MOE) \u0111\u1ea1t c\u00e1c gi\u00e1 tr\u1ecb t\u01b0\u01a1ng \u1ee9ng 68,2 MPa v\u00e0 8,8 GPa cao h\u01a1n so v\u1edbi v\u00e1n gh\u00e9p thanh kh\u00f4ng ph\u1ee7 m\u1eb7t l\u1ea7n l\u01b0\u1ee3t l\u00e0 5,6% v\u00e0 4,5%; \u0110\u1ed9 b\u1ec1n li\u00ean k\u1ebft b\u1ec1 m\u1eb7t t\u0103ng khi th\u1eddi gian \u00e9p t\u0103ng, sau \u0111\u00f3 gi\u1ea3m khi th\u1eddi gian \u00e9p ti\u1ebfp t\u1ee5c t\u0103ng. C\u1ee5 th\u1ec3, \u1edf c\u00f9ng \u00e1p su\u1ea5t \u00e9p 0,7 MPa, th\u1eddi gian \u00e9p 2 ph\u00fat, 3 ph\u00fat cho k\u1ebft qu\u1ea3 m\u1ee9c \u0111\u1ed9 li\u00ean k\u1ebft b\u1ec1 m\u1eb7t l\u1ea7n l\u01b0\u1ee3t t\u01b0\u01a1ng \u1ee9ng t\u0103ng t\u1eeb 1,27 MPa \u0111\u1ebfn 1,41 MPa, ti\u1ebfp t\u1ee5c t\u0103ng th\u1eddi gian \u00e9p l\u00ean 4 ph\u00fat th\u00ec \u0111\u1ed9 b\u1ec1n b\u1ec1 m\u1eb7t gi\u1ea3m xu\u1ed1ng 1,36 MPa; L\u01b0\u1ee3ng keo tr\u00e1ng MUF 100 g\/m2<\/sup> b\u1ec1 m\u1eb7t \u0111\u01b0\u1ee3c \u00e9p ph\u1ee7 c\u1ea3 2 m\u1eb7t v\u00e1n c\u00f3 h\u00e0m l\u01b0\u1ee3ng formaldehyde t\u1ef1 do \u1edf l\u1edbp m\u1eb7t l\u00e0 2,71 mg\/L, \u0111\u1ea1t E2 theo ti\u00eau chu\u1ea9n GB 18580 – 2001.<\/p>\n

T\u1eeb kh\u00f3a:<\/em><\/strong> V\u00e1n gh\u00e9p thanh g\u1ed7 keo, \u00e9p ph\u1ee7 m\u1eb7t, v\u00e1n nh\u00e2n t\u1ea1o, v\u00e1n l\u1ea1ng g\u1ed7 S\u1ed3i \u0111\u1ecf, \u0111\u1ed9 b\u1ec1n li\u00ean k\u1ebft b\u1ec1 m\u1eb7t<\/td>\n<\/tr>\n

\n

<\/a>Determination of hot-pressing technology parameters for overlaying Red Oak veneers on Acacia hybrid finger joint boards<\/strong><\/p>\n

Veneer overlaying technology is the final important step in the production of veneer overlayed wood-based panels. The bonding strength between veneers and wood-based panels\u2019 surfaces is influenced by several factors such as pressing parameters (Pressure, Temperature, and Time), types of resin, veneers, and substrates. This study has determined the technology parameters for overlaying red oak veneers (0.4 mm thickness) on finger joint boards\u2019 surfaces made from Acacia hybrid with a thickness of 12 mm bonded by Melamine urea formaldehyde (MUF) is P = 0.7 MPa; T = 115o<\/sup>C; \u03c4 = 3 minutes with the modulus of rupture (MOR) of 68.2 MPa, and the modulus of elasticity (MOE) of 8.8 GPa which are higher than that of finger joint boards without overlaying veneer 5.6% and 4.5%, respectively. The bonding strength between veneers and surfaces of finger joint boards increased with the increase in processing time, subsequently deceased with the continuous increase in pressing time. At the pressure of 0.7 MPa, the bonding strength increased from 1.27 MPa to 1.41 MPa with the increase in pressing time from 2 minutes to 3 minutes, respectively, and then this value decreased to 1.36 MPa with pressing time continuously increasing to 4 minutes. With the resin spread of 100 g\/m2<\/sup>, The free formaldehyde content released from the surfaces of the finger joint board overlayed veneers on both surfaces is 2.71 mg\/L which meets the E2 level according to the Chinese standard GB 18580 – 2001.<\/p>\n

Keywords:<\/em><\/strong> Acacia hybrid finger joint boards, veneer overlaying technology, wood-based panels, Red Oak veneers, surface bonding strength<\/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 4 – 2022 1. Nghi\u00ean c\u1ee9u ch\u1ecdn gi\u1ed1ng keo lai m\u1edbi sinh tr\u01b0\u1edfng nhanh ph\u1ee5c v\u1ee5 tr\u1ed3ng r\u1eebng \u1edf v\u00f9ng Duy\u00ean h\u1ea3i Nam Trung B\u1ed9 Selection of fast growing acacia hybrid clones for afforestation in South Central Coast of Vietnam Nguy\u1ec5n \u0110\u1ee9c Ki\u00ean Ng\u00f4 V\u0103n Ch\u00ednh D\u01b0\u01a1ng H\u1ed3ng […]<\/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\/2307"}],"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=2307"}],"version-history":[{"count":3,"href":"https:\/\/vafs.gov.vn\/en\/wp-json\/wp\/v2\/posts\/2307\/revisions"}],"predecessor-version":[{"id":2386,"href":"https:\/\/vafs.gov.vn\/en\/wp-json\/wp\/v2\/posts\/2307\/revisions\/2386"}],"wp:attachment":[{"href":"https:\/\/vafs.gov.vn\/en\/wp-json\/wp\/v2\/media?parent=2307"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vafs.gov.vn\/en\/wp-json\/wp\/v2\/categories?post=2307"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vafs.gov.vn\/en\/wp-json\/wp\/v2\/tags?post=2307"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}