{"id":2215,"date":"2021-05-24T10:58:55","date_gmt":"2021-05-24T03:58:55","guid":{"rendered":"http:\/\/vafs.gov.vn\/en\/?p=2215"},"modified":"2023-11-23T12:24:51","modified_gmt":"2023-11-23T05:24:51","slug":"vietnam-journal-of-forest-science-number-2-2021","status":"publish","type":"post","link":"https:\/\/vafs.gov.vn\/en\/vietnam-journal-of-forest-science-number-2-2021\/","title":{"rendered":"Vietnam Journal of Forest Science Number 2-2021"},"content":{"rendered":"

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<\/a><\/a><\/a>T\u1ea0P CH\u00cd KHOA H\u1eccC L\u00c2M NGHI\u1ec6P S\u1ed0 2<\/strong> – <\/strong>20<\/strong>21<\/strong><\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
1.<\/td>\nNghi\u00ean c\u1ee9u \u0111\u1eb7c \u0111i\u1ec3m h\u00ecnh th\u00e1i, sinh l\u00fd h\u1ea1t gi\u1ed1ng v\u00e0 \u1ea3nh h\u01b0\u1edfng c\u1ee7a th\u00e0nh ph\u1ea7n ru\u1ed9t b\u1ea7u \u0111\u1ebfn sinh tr\u01b0\u1edfng \u00a0v\u00e0 ph\u00e1t tri\u1ec3n c\u1ee7a Sa nh\u00e2n t\u00edm (Amomum longiligulare <\/em>T.L.Wu) t\u1ea1i huy\u1ec7n Ba V\u00ec, H\u00e0 N\u1ed9i<\/td>\nResearch on morphological characteristics, seed physiology and effect of container component on growth and development of Amomum longiligulare<\/em> T.L.Wu planted in Ba Vi district, Hanoi city<\/td>\nB\u00f9i Ki\u1ec1u H\u01b0ng
\nV\u00f5 \u0110\u1ea1i H\u1ea3i<\/td>\n		3<\/td>\n<\/tr>\n
2.<\/td>\nM\u1ed9t s\u1ed1 \u0111\u1eb7c \u0111i\u1ec3m \u0111a d\u1ea1ng lo\u00e0i c\u00e2y g\u1ed7 ph\u1ee5c h\u1ed3i sau canh t\u00e1c n\u01b0\u01a1ng r\u1eaby t\u1ea1i huy\u1ec7n M\u1ed9c Ch\u00e2u, t\u1ec9nh S\u01a1n La<\/td>\nSome characteristics on tree species diversity of forest rehabilitation after shifting cultivation in Moc Chau district, Son La province<\/td>\nNguy\u1ec5n Ho\u00e0ng H\u01b0\u01a1ng
\nTr\u1ea7n Vi\u1ec7t H\u00e0
\nPh\u1ea1m Th\u1ebf Anh
\nL\u00ea Th\u1ecb Khi\u1ebfu<\/td>\n		15<\/td>\n<\/tr>\n
3.<\/td>\n\u0110\u1eb7c \u0111i\u1ec3m t\u00e1i sinh c\u00e1c lo\u00e0i c\u00e2y g\u1ed7 tr\u00ean n\u00fai \u0111\u00e1 v\u00f4i\u00a0 t\u1ea1i V\u01b0\u1eddn Qu\u1ed1c gia C\u00e1t B\u00e0<\/td>\nRegeneration characteristics of timber species on limestone mountain forest in Cat Ba National Park<\/td>\nL\u00ea H\u1ed3ng Li\u00ean
\nHo\u00e0ng Thanh S\u01a1n
\nTr\u1ecbnh Ngo\u0323c Bon
\nNinh Vi\u1ec7t Kh\u01b0\u01a1ng
\nTri\u1ec7u Th\u00e1i H\u01b0ng
\nB\u00f9i Th\u1ebf \u0110\u1ed3i
\nTr\u00e2\u0300n Cao Nguy\u00ean
\nTr\u00e2\u0300n Ha\u0309i Long
\nNguy\u1ec5n Th\u1ecb Thu H\u1eb1ng
\nPh\u1ea1m Th\u1ecb Qu\u1ef3nh<\/td>\n		25<\/td>\n<\/tr>\n
4.<\/td>\n\u0110\u1eb7c \u0111i\u1ec3m c\u1ea5u tr\u00fac v\u00e0 t\u00e1i sinh\u00a0 c\u1ee7a lo\u00e0i Hu\u1ef7nh (Tarrietia javanica<\/em> Blume)\u00a0 \u1edf v\u00f9ng Nam Trung B\u1ed9<\/td>\nStructural and regenerative characteristics of Tarrietia javanica<\/em> Blume in South Central<\/td>\nPh\u1ea1m Xu\u00e2n \u0110\u1ec9nh
\nNguy\u1ec5n Th\u1ecb Li\u1ec7u
\nV\u0169 \u0110\u1ee9c B\u00ecnh
\nNguy\u1ec5n H\u1ea3i Th\u00e0nh
\nL\u00ea C\u00f4ng \u0110\u1ecbnh
\nL\u00ea Xu\u00e2n To\u00e0n
\nH\u00e0 V\u0103n Thi\u1ec7n
\nPh\u1ea1m Ti\u1ebfn H\u00f9ng
\nNguy\u1ec5n Th\u1ecb Kim Vui<\/td>\n		36<\/td>\n<\/tr>\n
5.<\/td>\nNghi\u00ean c\u1ee9u ch\u1ecdn lo\u00e0i c\u00e2y b\u1ea3n \u0111\u1ecba c\u00f3 tri\u1ec3n v\u1ecdng\u00a0 cho tr\u1ed3ng r\u1eebng \u1edf Qu\u1ea3ng Ninh<\/td>\nResearch on selection of prospects indigenous tree species for afforestation in Quang Ninh<\/td>\nHo\u00e0ng V\u0103n Th\u1eafng<\/td>\n45<\/td>\n<\/tr>\n
6.<\/td>\n\u1ea2nh h\u01b0\u1edfng c\u1ee7a ti\u1ec3u l\u1eadp \u0111\u1ecba \u0111\u1ebfn sinh kh\u1ed1i r\u1ec5 c\u00e1m\u00a0 r\u1eebng t\u1ef1 nhi\u00ean l\u00e1 r\u1ed9ng th\u01b0\u1eddng xanh t\u1ea1i T\u00e2y Nam Nh\u1eadt B\u1ea3n<\/td>\nEffect of microsites on fine root production in evergreen broad-leaved forest, Northwestern, Japan<\/td>\nTr\u1ea7n V\u0103n \u0110\u00f4
\nNguy\u1ec5n To\u00e0n Th\u1eafng
\nV\u0169 Ti\u1ebfn L\u00e2m
\n\u0110\u00e0o Trung \u0110\u1ee9cNguy\u1ec5n Tr\u1ecdng Minh<\/td>\n		54<\/td>\n<\/tr>\n
7.<\/td>\n\u0110\u00e1nh gi\u00e1 th\u1ef1c tr\u1ea1ng r\u1eebng tr\u1ed3ng keo t\u1ea1i t\u1ec9nh
\nQu\u1ea3ng Ninh<\/td>\n		Assessment of acacia plantation status in Quang Ninh province<\/td>\nPh\u1ea1m V\u0103n Vi\u1ec7n
\nV\u0169 Duy V\u0103n
\nHo\u00e0ng V\u0103n Th\u1eafng
\nL\u00ea V\u0103n Quang
\nCao V\u0103n L\u1ea1ng
\nHo\u00e0ng V\u0103n Th\u00e0nh
\nD\u01b0\u01a1ng Quang Trung
\nNguy\u1ec5n Vi\u1ec7t C\u01b0\u1eddng
\nNguy\u1ec5n V\u0103n Tu\u1ea5n<\/td>\n		59<\/td>\n<\/tr>\n
8.<\/td>\nNghi\u00ean c\u1ee9u m\u1ed9t s\u1ed1 bi\u1ec7n ph\u00e1p k\u1ef9 thu\u1eadt\u00a0 tr\u1ed3ng r\u1eebng th\u00e2m canh D\u1ebb \u0111\u1ecf (Lithocarpus ducampii<\/em> A. Camus) cung c\u1ea5p g\u1ed7 l\u1edbn t\u1ea1i t\u1ec9nh Ph\u00fa Th\u1ecd<\/td>\nResearch on some intensive planting techniques of growing Lithocarpus ducampii<\/em> A. Camus forest for larger size timber in Phu Tho province<\/td>\n\u0110\u00e0o H\u00f9ng M\u1ea1nh
\nNguy\u1ec5n Anh D\u0169ng
\nV\u00f5 \u0110\u1ea1i Nguy\u00ean<\/td>\n		71<\/td>\n<\/tr>\n
9.<\/td>\nTh\u1ef1c tr\u1ea1ng v\u00e0 gi\u1ea3i ph\u00e1p ph\u00e1t tri\u1ec3n r\u1eebng tr\u1ed3ng keo lai theo h\u01b0\u1edbng kinh doanh g\u1ed7 l\u1edbn quy m\u00f4 h\u1ed9 gia \u0111\u00ecnh\u00a0 t\u1ea1i t\u1ec9nh Qu\u1ea3ng Tr\u1ecb<\/td>\nCurrent situation and solutions for developing sawn timber-oriented acacia hybrid plantation at household scale in Quang Tri province<\/td>\nTr\u1ea7n Th\u1ecb Th\u00fay H\u1eb1ng
\nHo\u00e0ng Huy Tu\u1ea5n
\nPh\u1ea1m C\u01b0\u1eddng<\/td>\n		79<\/td>\n<\/tr>\n
10.<\/td>\nThi\u1ebft k\u1ebf ch\u1ebf t\u1ea1o h\u1ec7 th\u1ed1ng thi\u1ebft b\u1ecb\u00a0 s\u1ea5y g\u1ed7 x\u1ebb r\u1eebng tr\u1ed3ng b\u1eb1ng n\u0103ng l\u01b0\u1ee3ng m\u1eb7t tr\u1eddi<\/td>\nConstruction and evaluation of a timber-drying solar kiln<\/td>\nB\u00f9i Duy Ng\u1ecdc<\/td>\n92<\/td>\n<\/tr>\n
11.<\/td>\nM\u1ed9t s\u1ed1 \u0111\u1eb7c \u0111i\u1ec3m c\u1ea5u t\u1ea1o\u00a0 c\u1ee7a g\u1ed7 Keo tai t\u01b0\u1ee3ng (Acacia mangium <\/em>Willd.)\u00a0 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn qu\u00e1 tr\u00ecnh s\u1ea5y<\/td>\nSome wood anatomical features of Acacia mangium<\/em> Willd. affect the drying process<\/td>\nH\u00e0 Ti\u1ebfn M\u1ea1nh
\nPh\u1ea1m V\u0103n Ch\u01b0\u01a1ng
\nB\u00f9i Duy Ng\u1ecdc
\n\u0110\u1ed7 V\u0103n B\u1ea3n
\nNguy\u1ec5n \u0110\u1ee9c Th\u00e0nh
\nB\u00f9i H\u1eefu Th\u01b0\u1edfng<\/td>\n		100<\/td>\n<\/tr>\n
12.<\/td>\nEffect of wood species on uv weathering resistance of wood-plastic composites<\/td>\n\u1ea2nh h\u01b0\u1edfng c\u1ee7a lo\u00e0i g\u1ed7 \u0111\u1ebfn kh\u1ea3 n\u0103ng ch\u1ed1ng ch\u1ecbu th\u1eddi ti\u1ebft c\u1ee7a v\u1eadt li\u1ec7u g\u1ed7 nh\u1ef1a<\/td>\nNguyen Van Dinh
\nNguyen Van Giap
\nNguyen Thanh Tung
\nTa Thi Thanh Huong<\/td>\n		113<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

 <\/p>\n

NGHI\u00caN C\u1ee8U \u0110\u1eb6C \u0110I\u1ec2M H\u00ccNH TH\u00c1I, SINH L\u00dd H\u1ea0T GI\u1ed0NG\u00a0V\u00c0 \u1ea2NH H\u01af\u1edeNG C\u1ee6A TH\u00c0NH PH\u1ea6N RU\u1ed8T B\u1ea6U \u0110\u1ebeN SINH TR\u01af\u1edeNG\u00a0V\u00c0 PH\u00c1T TRI\u1ec2N C\u1ee6A SA NH\u00c2N T\u00cdM (Amomum longiligulare<\/em> T.L.Wu) T\u1ea0I HUY\u1ec6N BA V\u00cc, H\u00c0 N\u1ed8I<\/p>\n

B\u00f9i Ki\u1ec1u H\u01b0ng1<\/sup>, V\u00f5 \u0110\u1ea1i H\u1ea3i2<\/sup><\/p>\n

1<\/sup>Trung t\u00e2m Nghi\u00ean c\u1ee9u v\u00e0 Chuy\u1ec3n giao K\u1ef9 thu\u1eadt L\u00e2m sinh
\n2<\/sup>Vi\u1ec7n Khoa h\u1ecdc L\u00e2m nghi\u1ec7p Vi\u1ec7t Nam<\/p>\n\n\n\n\n
T\u00d3M T\u1eaeT<\/p>\n

Sa nh\u00e2n t\u00edm thu\u1ed9c chi Sa nh\u00e2n, h\u1ecd G\u1eebng, l\u00e0 lo\u1ea1i d\u01b0\u1ee3c li\u1ec7u qu\u00fd, c\u00f3 c\u00f4ng d\u1ee5ng l\u00e0m thu\u1ed1c ch\u1eefa b\u1ec7nh, s\u1eed d\u1ee5ng trong c\u00f4ng ngh\u1ec7 m\u1ef9 ph\u1ea9m v\u00e0 d\u00f9ng l\u00e0m gia v\u1ecb. Nghi\u00ean c\u1ee9u \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n t\u1ea1i huy\u1ec7n Ba V\u00ec, th\u00e0nh ph\u1ed1 H\u00e0 N\u1ed9i. K\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u cho th\u1ea5y \u0111\u1eb7c \u0111i\u1ec3m h\u00ecnh th\u00e1i c\u1ee7a Sa nh\u00e2n t\u00edm tr\u1ed3ng \u1edf huy\u1ec7n Ba V\u00ec c\u01a1 b\u1ea3n c\u0169ng gi\u1ed1ng \u0111\u1eb7c \u0111i\u1ec3m h\u00ecnh th\u00e1i Sa nh\u00e2n t\u00edm tr\u1ed3ng \u1edf c\u00e1c khu v\u1ef1c kh\u00e1c v\u1ec1 th\u00e2n, l\u00e1, hoa v\u00e0 qu\u1ea3. K\u00edch th\u01b0\u1edbc qu\u1ea3: d\u00e0i 8,0-15,0mm, chi\u1ec1u r\u1ed9ng 5,0-12,0mm. K\u00edch th\u01b0\u1edbc h\u1ea1t: d\u00e0i 1,2-1,5mm; chi\u1ec1u r\u1ed9ng 1,0-1,2mm. M\u1ed9t s\u1ed1 \u0111\u1eb7c \u0111i\u1ec3m sinh l\u00fd h\u1ea1t gi\u1ed1ng nh\u01b0 sau: kh\u1ed1i l\u01b0\u1ee3ng 1.000 h\u1ea1t l\u00e0 14,7g; \u0111\u1ed9 thu\u1ea7n c\u1ee7a h\u1ea1t gi\u1ed1ng: 80,7%; t\u1ef7 l\u1ec7 n\u1ea3y m\u1ea7m: 90,5%; th\u1ebf n\u1ea3y m\u1ea7m: 70,0%; h\u00e0m l\u01b0\u1ee3ng n\u01b0\u1edbc trong h\u1ea1t: 27,4%; th\u1eddi gian h\u1ea1t b\u1eaft \u0111\u1ea7u n\u1ea3y m\u1ea7m: 23 ng\u00e0y sau khi gieo; Th\u1eddi gian h\u1ea1t k\u1ebft th\u00fac n\u1ea3y m\u1ea7m: 45 ng\u00e0y sau khi gieo. Th\u00e0nh ph\u1ea7n ru\u1ed9t b\u1ea7u t\u1ed1t nh\u1ea5t cho s\u1ea3n xu\u1ea5t c\u00e2y con Sa nh\u00e2n t\u00edm gieo \u01b0\u01a1m t\u1eeb h\u1ea1t l\u00e0: 94% \u0111\u00e2\u0301t + 5% ph\u00e2n chu\u00f4\u0300ng hoai + 1% NPK.<\/p>\n

T\u1eeb kh\u00f3a:<\/em><\/strong> \u0110\u1eb7c \u0111i\u1ec3m h\u00ecnh th\u00e1i, sinh l\u00fd h\u1ea1t gi\u1ed1ng, th\u00e0nh ph\u1ea7n ru\u1ed9t b\u1ea7u, Sa nh\u00e2n t\u00edm, Ba V\u00ec – H\u00e0 N\u1ed9i<\/td>\n<\/tr>\n

\n

Research on morphological characteristics, seed physiology and effect of container component on growth and development of Amomum longiligulare<\/em> T.L.Wu planted in Ba Vi district, Ha Noi city<\/strong><\/p>\n

Amomum longiligulare T.L.Wu belongs to Amomum genus, Zingiberaceaeh\u1ecd family. This is precious medicinal plant, used for medicine making, beauty product manufacturing and for spice purposes. The research was conducted in Ba Vi district, Ha Noi city\/Vietnam. Research results show that morphological characteristics of Amomum longiligulare T.L.Wu planted in Ba Vi district basically similar with ones planted in other locations on stem, leaf, flower and fruit. Size of fruits is 8.0-15.0mm in length, 5.0-12.0mm in width. Size of seed is 1.2-1.5mm in length; 1.0-1.2mm in with. Physiological characteristics of Amomum longiligulare seed are as follows: weight of 1.000 seeds is 14.7g; seed purity: 80.7%; seed germination: 90.5%; seed energy: 70.0%; water content in seed: 27.4%; seeds begin to germinate in 23th day after sowing and terminate germination in 45th day after sowing. The best container component for Amomum longiligulare T.L.Wu is 94% fertile soil + 5% muck + 1% NPK fertilizer.<\/p>\n

Keywords:<\/em><\/strong> Morphological characteristics, physiological characteristics of seed, component of seedling container, Amomum longiligulare<\/em> T.L.Wu, Ba Vi district – Hanoi city<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

<\/a>M\u1ed8T S\u1ed0 \u0110\u1eb6C \u0110I\u1ec2M \u0110A D\u1ea0NG LO\u00c0I C\u00c2Y G\u1ed6 PH\u1ee4C H\u1ed2I\u00a0SAU CANH T\u00c1C N\u01af\u01a0NG R\u1eaaY T\u1ea0I HUY\u1ec6N M\u1ed8C CH\u00c2U, T\u1ec8NH S\u01a0N LA<\/p>\n

<\/a>Nguy\u1ec5n Ho\u00e0ng H\u01b0\u01a1ng, Tr\u1ea7n Vi\u1ec7t H\u00e0, Ph\u1ea1m Th\u1ebf Anh, L\u00ea Th\u1ecb Khi\u1ebfu<\/p>\n

Tr\u01b0\u1eddng \u0110\u1ea1i h\u1ecdc L\u00e2m nghi\u1ec7p<\/p>\n\n\n\n\n
T\u00d3M T\u1eaeT<\/p>\n

Nghi\u00ean c\u1ee9u \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n nh\u1eb1m \u0111\u00e1nh gi\u00e1 v\u00e0 so s\u00e1nh \u0111a d\u1ea1ng lo\u00e0i c\u00e2y g\u1ed7 ph\u1ee5c h\u1ed3i sau canh t\u00e1c n\u01b0\u01a1ng r\u1eaby t\u1ea1i huy\u1ec7n M\u1ed9c Ch\u00e2u, t\u1ec9nh S\u01a1n La. T\u1ed5ng s\u1ed1 50 \u00f4 ti\u00eau chu\u1ea9n (OTC) t\u1ea1m th\u1eddi \u0111\u01b0\u1ee3c thi\u1ebft l\u1eadp (m\u1ed7i \u00f4 c\u00f3 di\u1ec7n t\u00edch 400 m2<\/sup> (20 \u00b4 20 m)) v\u00e0 thu th\u1eadp s\u1ed1 li\u1ec7u cho to\u00e0n b\u1ed9 c\u00e2y c\u00f3 chi\u1ec1u cao v\u00fat ng\u1ecdn t\u1eeb 2 m tr\u1edf l\u00ean v\u00e0 \u0111\u01b0\u1eddng k\u00ednh ngang ng\u1ef1c t\u1eeb 6 cm tr\u1edf l\u00ean. K\u1ebft qu\u1ea3 cho th\u1ea5y, v\u1edbi b\u1ed9 ph\u1eadn c\u00e2y r\u1eebng c\u00f3 HVN<\/sub> \u2265 2 m, c\u00e1c gi\u00e1 tr\u1ecb ch\u1ec9 s\u1ed1 \u0111a d\u1ea1ng lo\u00e0i (g\u1ed3m s\u1ed1 lo\u00e0i, ch\u1ec9 s\u1ed1 Shannon-Wiener, ch\u1ec9 s\u1ed1 Simpson) cao nh\u1ea5t l\u00e0 \u1edf giai \u0111o\u1ea1n ph\u1ee5c h\u1ed3i r\u1eebng sau 15 n\u0103m (v\u1edbi gi\u00e1 tr\u1ecb c\u1ee7a c\u00e1c ch\u1ec9 s\u1ed1 n\u00e0y l\u1ea7n l\u01b0\u1ee3t l\u00e0 24; 2,810; 0,866) v\u00e0 th\u1ea5p nh\u1ea5t l\u00e0 \u1edf giai \u0111o\u1ea1n ph\u1ee5c h\u1ed3i r\u1eebng sau 5 n\u0103m (12; 2,162; 0,847); theo h\u1ed3 s\u01a1 \u0111a d\u1ea1ng th\u00ec \u0111a d\u1ea1ng n\u1ed9i t\u1ea1i c\u1ee7a giai \u0111o\u1ea1n ph\u1ee5c h\u1ed3i sau 15 n\u0103m cao h\u01a1n so v\u1edbi hai giai \u0111o\u1ea1n ph\u1ee5c h\u1ed3i sau 10 n\u0103m v\u00e0 5 n\u0103m. V\u1edbi b\u1ed9 ph\u1eadn c\u00e2y r\u1eebng c\u00f3 D1,3<\/sub> \u2265 6 cm, c\u00e1c gi\u00e1 tr\u1ecb v\u1ec1 ch\u1ec9 s\u1ed1 \u0111a d\u1ea1ng lo\u00e0i \u1edf giai \u0111o\u1ea1n ph\u1ee5c h\u1ed3i r\u1eebng sau 10 n\u0103m l\u1ea7n l\u01b0\u1ee3t l\u00e0 16; 2,184; 0,841, \u1edf giai \u0111o\u1ea1n ph\u1ee5c h\u1ed3i r\u1eebng sau 15 n\u0103m \u0111\u00e3 t\u0103ng l\u00ean l\u1ea7n l\u01b0\u1ee3t l\u00e0 21; 2,759; 0,879; theo h\u1ed3 s\u01a1 \u0111a d\u1ea1ng th\u00ec \u0111a d\u1ea1ng n\u1ed9i t\u1ea1i c\u1ee7a giai \u0111o\u1ea1n ph\u1ee5c h\u1ed3i sau 15 n\u0103m c\u0169ng l\u1edbn h\u01a1n so v\u1edbi giai \u0111o\u1ea1n ph\u1ee5c h\u1ed3i sau 10 n\u0103m. Nh\u00ecn chung, c\u00f3 s\u1ef1 kh\u00e1c bi\u1ec7t v\u1ec1 m\u1ee9c \u0111\u1ed9 \u0111a d\u1ea1ng lo\u00e0i c\u00e2y c\u1ee7a nh\u1eefng lo\u00e0i c\u00f3 chi\u1ec1u cao Hvn<\/sub> \u2265 2 m v\u00e0 c\u1ee7a b\u1ed9 ph\u1eadn c\u00e2y r\u1eebng c\u00f3 \u0111\u01b0\u1eddng k\u00ednh D1,3<\/sub> \u2265 6 cm theo th\u1eddi gian ph\u1ee5c h\u1ed3i, th\u1eddi gian ph\u1ee5c h\u1ed3i c\u00e0ng l\u00e2u th\u00ec m\u1ee9c \u0111\u1ed9 \u0111a d\u1ea1ng lo\u00e0i c\u00e0ng cao, Tuy nhi\u00ean, m\u1ee9c \u0111\u1ed9 \u0111a d\u1ea1ng lo\u00e0i c\u00e2y c\u1ee7a c\u00e1c giai \u0111o\u1ea1n ph\u1ee5c h\u1ed3i v\u1eabn nh\u1ecf h\u01a1n so v\u1edbi r\u1eebng t\u1ef1 nhi\u00ean (\u0111\u1ed1i ch\u1ee9ng).<\/p>\n

T\u1eeb kh\u00f3a:<\/em><\/strong> Ch\u1ec9 s\u1ed1 \u0111a d\u1ea1ng lo\u00e0i, h\u1ed3 s\u01a1 \u0111a d\u1ea1ng, ki\u1ec3u ph\u00e2n \u0111\u00f4i, ki\u1ec3u x\u1ebfp h\u1ea1ng, ph\u1ee5c h\u1ed3i r\u1eebng<\/td>\n<\/tr>\n

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<\/a>Some characteristics on tree species diversity of forest rehabilitation after shifting cultivation in Moc Chau district, Son La province<\/strong><\/p>\n

Research was conducted to evaluate and compare tree species diversity of forest rehabilitation after shifting cultivation in Moc Chau district, Son La province. A total of 50 temporary sample plots was established (each plot has an area of 400 m2<\/sup> (20 \u00b4 20 m)) and data was collected for all trees with total tree height \u2265 2 m and diameter at breast height \u2265 6 cm. The results showed that, with trees having HVN<\/sub> \u2265 2 m, the species diversity indices (including a number of species, Shannon-Wiener index, Simpson index) were highest at the forest rehabilitation after shifting cultivation 15 years (with the values of these indicators was 24, 2.810, 0.866, respectively) and the lowest at the forest rehabilitation after shifting cultivation 5 years (12; 2.162; 0.847, respectively); According to diversity profile, the intrinsic diversity at the forest rehabilitation after shifting cultivation 15 years is higher than that of the forest rehabilitation after shifting cultivation 10 years and 5 years. With trees having D1,3<\/sub> \u2265 6 cm, the values of species diversity indices of the forest rehabilitation after shifting cultivation 10 years are 16 ; 2.184; 0.841, respectively, the forest rehabilitation after shifting cultivation 15 years increased to 21; 2.759; 0.879, respectively; According to the diversity profile, the intrinsic diversity of the forest rehabilitation after shifting cultivation 15 years is also greater than that of forest rehabilitation after shifting cultivation 10 years. In general, there is a difference in tree species diversity of trees with HVN<\/sub> \u2265 2 m and trees with diameter D1,3<\/sub> \u2265 6 cm according to the rehabilitation time, the longer the rehabilitation time, the higher the species diversity level, but the tree species diversity level of the forest rehabilitation is still smaller than the natural forest (control).<\/p>\n

Keywords:<\/strong> Diversity indices, diversity profile, dichotomous type, rank type, forest rehabilitation<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

<\/a>\u0110\u1eb6C \u0110I\u1ec2M T\u00c1I SINH C\u00c1C LO\u00c0I C\u00c2Y G\u1ed6 TR\u00caN N\u00daI \u0110\u00c1 V\u00d4I\u00a0T\u1ea0I V\u01af\u1edcN QU\u1ed0C GIA C\u00c1T B\u00c0<\/p>\n

<\/a>L\u00ea H\u1ed3ng Li\u00ean1<\/sup>, Ho\u00e0ng Thanh S\u01a1n2<\/sup>, Tr\u1ecbnh Ngo\u0323c Bon2<\/sup>, Ninh Vi\u1ec7t Kh\u01b0\u01a1ng2<\/sup>,
\nTri\u1ec7u Th\u00e1i H\u01b0ng2<\/sup>, B\u00f9i Th\u1ebf \u0110\u1ed3i1<\/sup>, Tr\u00e2\u0300n Cao Nguy\u00ean2<\/sup>, Tr\u00e2\u0300n Ha\u0309i Long2<\/sup>,
\nNguy\u1ec5n Th\u1ecb Thu H\u1eb1ng1<\/sup>, Ph\u1ea1m Th\u1ecb Qu\u1ef3nh1<\/sup><\/p>\n

1<\/sup>Tr\u01b0\u1eddng \u0110\u1ea1i h\u1ecdc L\u00e2m nghi\u1ec7p
\n2<\/sup>Vi\u1ec7n Nghi\u00ean c\u01b0\u0301u L\u00e2m sinh<\/p>\n\n\n\n\n
T\u00d3M T\u1eaeT<\/p>\n

Ba\u0300i ba\u0301o tri\u0300nh ba\u0300y k\u00ea\u0301t qua\u0309 nghi\u00ean c\u1ee9u \u0111\u1eb7c \u0111i\u1ec3m t\u00e1i sinh c\u00e1c loa\u0300i c\u00e2y g\u00f4\u0303 cu\u0309a 5 ki\u1ec3u r\u1eebng v\u1edbi 18 qu\u1ea7n x\u00e3 th\u1ef1c v\u1eadt r\u1eebng (QXTV) \u0111\u1eb7c tr\u01b0ng tr\u00ean nu\u0301i \u0111a\u0301 v\u00f4i t\u1ea1i V\u01b0\u1eddn Qu\u1ed1c gia (VQG) C\u00e1t B\u00e0. \u1ede khu v\u1ef1c v\u00f9ng l\u00f5i, m\u1eadt \u0111\u1ed9 c\u00e2y t\u00e1i sinh c\u00e1c ki\u1ec3u r\u1eebng dao \u0111\u1ed9ng t\u1eeb 6.833 – 15.000 c\u00e2y\/ha, trong \u0111o\u0301 m\u1eadt \u0111\u1ed9 c\u00e2y t\u00e1i sinh chi\u1ec1u cao >100 cm t\u1eeb 1.833 – 3.500 c\u00e2y\/ha. T\u1ed5 th\u00e0nh lo\u00e0i dao \u0111\u1ed9ng t\u1eeb 7 – 17 lo\u00e0i tr\u00ean c\u00e1c qu\u1ea7n x\u00e3, trong \u0111\u00f3 c\u00f3 t\u1eeb 5 – 9 lo\u00e0i tham gia v\u00e0o c\u00f4ng th\u1ee9c t\u1ed5 th\u00e0nh. \u1ede khu v\u1ef1c v\u00f9ng \u0111\u00ea\u0323m, m\u1eadt \u0111\u1ed9 c\u00e2y t\u00e1i sinh ta\u0323i c\u00e1c ki\u1ec3u r\u1eebng dao \u0111\u00f4\u0323ng t\u1eeb 5.500 – 8.333 c\u00e2y\/ha, trong \u0111o\u0301 m\u1eadt \u0111\u1ed9 c\u00e2y t\u00e1i sinh co\u0301 chi\u1ec1u cao >100 cm dao \u0111\u00f4\u0323ng t\u1eeb 1.500 – 2.500 c\u00e2y\/ha. T\u1ed5 th\u00e0nh lo\u00e0i dao \u0111\u1ed9ng t\u1eeb 7 – 12 lo\u00e0i v\u00e0 c\u00f3 t\u1eeb 5 – 8 lo\u00e0i tham gia v\u00e0o c\u00f4ng th\u1ee9c t\u1ed5 th\u00e0nh. T\u1ef7 l\u1ec7 c\u00e2y t\u00e1i sinh tri\u1ec3n v\u1ecdng dao \u0111\u1ed9ng t\u1eeb 9 – 23%. V\u1ec1 \u0111a d\u1ea1ng sinh h\u1ecdc, ph\u00e1t hi\u1ec7n \u0111\u01b0\u1ee3c 75 lo\u00e0i c\u00e2y g\u1ed7. Ch\u1ec9 s\u1ed1 SI gi\u1eefa th\u1ea3m th\u1ef1c v\u1eadt r\u1eebng th\u1ee9 sinh b\u1ecb t\u00e1c \u0111\u1ed9ng I.\u0110k1 v\u00e0 I.Np1 – 1 cao nh\u1ea5t (0,52) so v\u1edbi ch\u1ec9 s\u1ed1 SI gi\u1eefa c\u00e1c ki\u1ec3u r\u1eebng kh\u00e1c. Ch\u1ec9 s\u1ed1 Margalef (d1) dao \u0111\u1ed9ng t\u1eeb 13,60 – 33,59, ch\u1ec9 s\u1ed1 Menhinik (d2) dao \u0111\u1ed9ng t\u1eeb 1,41 – 2,10, ch\u1ec9 s\u1ed1 Simpson dao \u0111\u1ed9ng t\u1eeb 0,05 – 0,10, ch\u1ec9 s\u1ed1 Shanon dao \u0111\u1ed9ng t\u1eeb 2,47 – 3,21. So s\u00e1nh c\u00e1c ch\u1ec9 s\u1ed1 n\u00e0y v\u1edbi k\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u ch\u1ec9 s\u1ed1 R\u1ebdnyi cho th\u1ea5y c\u00e1c tr\u1ea1ng th\u00e1i I.\u0110k1, I.Np1 – 1, c\u00f3 \u0111\u1ed9 \u0111a d\u1ea1ng v\u00e0 \u0111\u1ed3ng \u0111\u1ec1u v\u1ec1 s\u1ed1 l\u01b0\u1ee3ng cao h\u01a1n tr\u1ea1ng th\u00e1i I.Np1 – 2 (v\u00f9ng l\u00f5i), I.Np1 – 2 (v\u00f9ng \u0111\u1ec7m), I.Np2 – 1 v\u00e0 I.Np2 – 2. Tr\u1ea1ng th\u00e1i I.\u0110k1 c\u00f3 \u0111\u1ed9 \u0111a d\u1ea1ng v\u00e0 \u0111\u1ed3ng \u0111\u1ec1u gi\u1eefa c\u00e1c lo\u00e0i th\u1ef1c v\u1eadt cao nh\u1ea5t.<\/p>\n

T\u1eeb kh\u00f3a:<\/em><\/strong> Ki\u1ec3u r\u1eebng, qu\u1ea7n x\u00e3 th\u1ef1c v\u1eadt r\u1eebng, r\u1eebng n\u00fai \u0111\u00e1 v\u00f4i, t\u00e1i sinh r\u1eebng<\/td>\n<\/tr>\n

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<\/a>Regeneration characteristics of timber species on limestone mountain forest in Cat Ba National Park<\/strong><\/p>\n

The study presented research results on the regeneration characteristics of timber species of 5 forest types with 18 typical forest flora communities on limestone mountain in Cat Ba National Park. In the core zone, the density of regenerated trees of different forest types ranged from 6,833 to 15,000 trees\/ha, with the density of regenerated trees >100 cm in height from 1,833 to 3,500 trees\/ha. The species composition of regenerated trees ranged from 7 – 17 species in each community, of which 5 – 9 species participated in the composition formula. In the buffer zone, the densities of regenerated trees and regenerated trees >100 cm in height were 5,500 – 8,333 trees\/ha and 1,500 – 2,500 trees\/ha, respectively. The species composition was from 7 to 12 species, of which 5 – 8 species participated in the composition formula. The rate of potentially regenerated trees ranged 9 – 23%. Regarding biodiversity, 75 timber species were discovered. The SI index between the affected secondary forest vegetation I.\u0110k1 and I.Np1 – 1 was the highest (0.52) compared to other vegetation types. Margalef index (d1) ranged from 13.60 – 33.59, Menhinik index (d2) from 1.41 – 2.10, Simpson index from 0.05 – 0.10, Shanon index from 2.47 – 3.21. Comparing these indicators with the R\u1ebdnyi index showed that types I.\u0110k1 and I.Np1 – 1 had greater diversity and uniformity in number than I.Np1 – 2 (core zone), I.Np1 – 2 (buffer zone), I.Np2 – 1 and I.Np2 – 2. Meanwhile, I.\u0110k1 had the highest diversity and uniformity among plant species.<\/p>\n

Keywords:<\/em><\/strong> Forest type, forest flora community, limestone mountain forest, forest regeneration<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

<\/a>\u0110\u1eb6C \u0110I\u1ec2M C\u1ea4U TR\u00daC V\u00c0 T\u00c1I SINH\u00a0C\u1ee6A LO\u00c0I HU\u1ef6NH (Tarrietia javanica <\/em>Blume)
\n\u1ede V\u00d9NG NAM TRUNG B\u1ed8<\/p>\n

<\/a>Ph\u1ea1m Xu\u00e2n \u0110\u1ec9nh, Nguy\u1ec5n Th\u1ecb Li\u1ec7u, V\u0169 \u0110\u1ee9c B\u00ecnh, Nguy\u1ec5n H\u1ea3i Th\u00e0nh, L\u00ea C\u00f4ng \u0110\u1ecbnh,
\nL\u00ea Xu\u00e2n To\u00e0n, H\u00e0 V\u0103n Thi\u1ec7n, Ph\u1ea1m Ti\u1ebfn H\u00f9ng, Nguy\u1ec5n Th\u1ecb Kim Vui<\/p>\n

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

K\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u \u0111\u1eb7c \u0111i\u1ec3m c\u1ea5u tr\u00fac v\u00e0 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 Nam v\u00e0 Qu\u1ea3ng Ng\u00e3i cho th\u1ea5y, m\u1eadt \u0111\u1ed9 c\u00e2y Hu\u1ef7nh ph\u00e2n b\u1ed1 trong c\u00e1c tr\u1ea1ng th\u00e1i r\u1eebng dao \u0111\u1ed9ng t\u1eeb 4 – 9 c\u00e2y\/ha, chi\u1ebfm t\u1ef7 l\u1ec7 t\u1eeb 0,6 \u0111\u1ebfn 1,2% t\u1ed5ng s\u1ed1 c\u00e2y, t\u01b0\u01a1ng \u1ee9ng v\u1edbi ti\u1ebft di\u1ec7n ngang v\u00e0 tr\u1eef l\u01b0\u1ee3ng Hu\u1ef7nh trong c\u00e1c tr\u1ea1ng th\u00e1i r\u1eebng dao \u0111\u1ed9ng t\u1eeb G = 0,1 – 0,3 m2<\/sup>\/ha v\u00e0 M = 0,1 – 2,4 m3<\/sup>\/ha. Trong c\u00e1c tr\u1ea1ng th\u00e1i r\u1eebng t\u1ef1 nhi\u00ean, Hu\u1ef7nh kh\u00f4ng tham gia v\u00e0o c\u00f4ng th\u1ee9c t\u1ed5 th\u00e0nh v\u00e0 c\u00f3 ch\u1ec9 s\u1ed1 IVi% r\u1ea5t th\u1ea5p t\u1eeb 0,6 – 1,3%. T\u1ea7ng c\u00e2y cao thu\u1ed9c c\u00e1c tr\u1ea1ng th\u00e1i r\u1eebng c\u00f3 Hu\u1ef7nh ph\u00e2n b\u1ed1 \u0111\u00e3 h\u00ecnh th\u00e0nh 2 \u01b0u h\u1ee3p \u1edf tr\u1ea1ng th\u00e1i r\u1eebng th\u01b0\u1eddng xanh gi\u00e0u v\u00e0 tr\u1ea1ng th\u00e1i r\u1eebng th\u01b0\u1eddng xanh trung b\u00ecnh c\u1ee7a t\u1ec9nh Qu\u1ea3ng Ng\u00e3i. M\u1eadt \u0111\u1ed9 c\u00e2y 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 26 – 213 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 30 – 55 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 4 – 6 lo\u00e0i. Hu\u1ef7nh 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 IVi% dao \u0111\u1ed9ng t\u1eeb 0,6 – 2,2%. 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 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> C\u1ea5u tr\u00fac, Hu\u1ef7nh, t\u00e1i sinh, Nam Trung B\u1ed9.<\/td>\n<\/tr>\n

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<\/a>Structural and regenerative characteristics of Tarrietia javanica<\/em> Blume in South Central<\/strong><\/p>\n

The results of structural and regenerative characteristics of Tarrietia javanica<\/em> Blume in natural forest in Quang Nam and Quang Ngai showed that the density of Tarrietia javanica <\/em>Blume distributed in the natural forests ranges from 4 to 9 trees\/ha, accounted for 0.6 to 1.2% of total trees, corresponding to the base area is 0.1 – 0.3 square meters ha-1<\/sup> and yeild is 0.1 – 2.4 cubic meters ha-1<\/sup>. In the natural forest, Tarrietia javanica <\/em>Blume did not participate in the dominant species and had a very low IVi% index from 0.6 to 1.3%. In upper canopy of the forest which has Tarrietia javanica <\/em>Blume,<\/em> there were 2 groups of dominance species in rich and medium evergreen forest in Quang Ngai province. The density of 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 36 to 50 species and the number of seedlings species included in formula of species composition ranged from 4 to 6. Seedlings of Tarrietia javanica <\/em>Blume did not involved in the dominant species and the IVi% index of Tarrietia javanica <\/em>Blume ranged from 0.6 to 2.2%. Seedlings density of Tarrietia javanica <\/em>Blume varied according to the height and seedlings more than 2 m in height was very few in nature forest.<\/p>\n

Keywords:<\/em><\/strong> Structure, Tarrietia javanica<\/em>, regeneration, South Central.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u00a0<\/strong><\/p>\n

<\/a>NGHI\u00caN C\u1ee8U CH\u1eccN LO\u00c0I C\u00c2Y B\u1ea2N \u0110\u1ecaA C\u00d3 TRI\u1ec2N V\u1eccNG\u00a0CHO TR\u1ed2NG R\u1eeaNG \u1ede QU\u1ea2NG NINH<\/p>\n

<\/a>Ho\u00e0ng V\u0103n Th\u1eafng<\/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

K\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u l\u1ef1a ch\u1ecdn lo\u00e0i c\u00e2y b\u1ea3n \u0111\u1ecba c\u00f3 tri\u1ec3n v\u1ecdng cho tr\u1ed3ng r\u1eebng \u1edf Qu\u1ea3ng Ninh \u0111\u00e3 x\u00e2y d\u1ef1ng \u0111\u01b0\u1ee3c b\u1ed9 ti\u00eau ch\u00ed g\u1ed3m 3 nh\u00f3m ti\u00eau ch\u00ed ch\u00ednh v\u1edbi t\u1ed5ng s\u1ed1 16 ch\u1ec9 ti\u00eau. M\u1ed7i ch\u1ec9 ti\u00eau \u0111\u01b0\u1ee3c chia th\u00e0nh 2 – 3 c\u1ea5p \u0111\u1ed9 v\u1edbi thang \u0111i\u1ec3m kh\u00e1c nhau v\u00e0 c\u00f3 tr\u1ecdng s\u1ed1 kh\u00e1c nhau t\u00f9y theo m\u1ee9c \u0111\u1ed9 \u1ea3nh h\u01b0\u1edfng c\u1ee7a ch\u1ec9 ti\u00eau \u0111\u00f3 \u0111\u1ebfn kh\u1ea3 n\u0103ng tr\u1ed3ng r\u1eebng cung c\u1ea5p g\u1ed7 l\u1edbn c\u1ee7a lo\u00e0i t\u1ea1i Qu\u1ea3ng Ninh. C\u0103n c\u1ee9 v\u00e0o b\u1ed9 ti\u00eau ch\u00ed \u0111\u00e3 x\u00e1c \u0111\u1ecbnh \u0111\u01b0\u1ee3c 10 lo\u00e0i c\u00e2y l\u00e1 r\u1ed9ng b\u1ea3n \u0111\u1ecba c\u00f3 tri\u1ec3n v\u1ecdng nh\u1ea5t cho tr\u1ed3ng r\u1eebng g\u1ed7 l\u1edbn \u1edf Qu\u1ea3ng Ninh, c\u00f3 t\u1ed5ng s\u1ed1 \u0111i\u1ec3m \u0111\u00e1nh gi\u00e1 \u0111\u1ea1t cao nh\u1ea5t t\u1eeb 53 – 68 \u0111i\u1ec3m \u0111\u01b0\u1ee3c x\u1ebfp theo th\u1ee9 t\u1ef1 \u01b0u ti\u00ean \u0111\u00f3 l\u00e0 c\u00e1c lo\u00e0i: Gi\u1ed5i xanh, S\u1ed3i ph\u1ea3ng, V\u00f9 h\u01b0\u01a1ng, Tr\u00e1m tr\u1eafng, L\u00e1t hoa, M\u1ee1, Xoan \u0111\u00e0o, Ch\u00f2 n\u00e2u, D\u1ebb \u0111\u1ecf, Lim xanh. Ngo\u00e0i ra, tr\u00ean c\u01a1 s\u1edf k\u1ebf th\u1eeba c\u00e1c t\u00e0i li\u1ec7u, k\u1ebft qu\u1ea3 \u0111\u00e3 c\u00f3 \u0111\u00e3 x\u00e1c \u0111\u1ecbnh \u0111\u01b0\u1ee3c th\u00eam 3 nh\u00f3m lo\u00e0i c\u00e2y kh\u00e1c v\u1edbi t\u1ed5ng s\u1ed1 22 lo\u00e0i c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng \u0111\u1ec3 tr\u1ed3ng r\u1eebng cung c\u1ea5p g\u1ed7 l\u1edbn \u1edf Qu\u1ea3ng Ninh l\u00e0: nh\u00f3m c\u00e2y r\u1ed9ng b\u1ea3n \u0111\u1ecba v\u00e0 c\u00e2y \u0111a t\u00e1c d\u1ee5ng g\u1ed3m 13 lo\u00e0i; nh\u00f3m lo\u00e0i c\u00e2y l\u00e1 r\u1ed9ng nh\u1eadp n\u1ed9i c\u00f3 th\u1ec3 tr\u1ed3ng r\u1eebng cung c\u1ea5p g\u1ed7 l\u1edbn g\u1ed3m 2 lo\u00e0i v\u00e0 nh\u00f3m lo\u00e0i c\u00e2y l\u00e1 kim v\u00e0 c\u00e2y m\u1ecdc nhanh c\u00f3 th\u1ec3 tr\u1ed3ng r\u1eebng cung c\u1ea5p g\u1ed7 l\u1edbn \u1edf Qu\u1ea3ng Ninh l\u00e0 7 lo\u00e0i.<\/p>\n

T\u1eeb kh\u00f3a:<\/em><\/strong> C\u00e2y b\u1ea3n \u0111\u1ecba, ti\u00eau ch\u00ed, Qu\u1ea3ng Ninh, r\u1eebng tr\u1ed3ng<\/td>\n<\/tr>\n

\n

<\/a>Research on selection of prospects indigenous tree species for afforestation in Quang Ninh<\/strong><\/p>\n

Research results on selecting indigenous species with potential for afforestation in Quang Ninh have established set of criteria including 3 main groups of criteria with a total of 16 indicators. Each indicator is divided into 2 – 3 levels with different points depending on the degree of influence of that indicator on the ability of the species to plant for timber plantaion in Quang Ninh province. Based on the set of criteria, the 10 most promising indigenous broadleaf species for timber plantation in Quang Ninh have a total of 53 – 68 points with the highest point, ranked in order of priority, including species: Michelia mediocris, Castanopsis cerebrina, Cinnamomum balansae, Canarium album, Chukrasia tabularis, Manglietia glauca, Prunus arborea, Diptercarpus retusus, Lithocarpus ducampii <\/em>and Erythrofloeum fordii<\/em>. In addition, on the basis of inheritance of the documents, the results have identified 3 more tree species groups with a total of 22 species that can be used for planting in Quang Ninh, including: indigenous and multi-purpose trees include 13 species; The group of exotic broadleaf trees that can be planted for timber supply includes 2 species and the group of conifers and fast growing trees that can be planted for timber supply in Quang Ninh are 7 species.<\/p>\n

Keywords:<\/em><\/strong> Criteria, indigenous tree, plantaion, Quang Ninh province<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

<\/a>\u1ea2NH H\u01af\u1edeNG C\u1ee6A TI\u1ec2U L\u1eacP \u0110\u1ecaA \u0110\u1ebeN SINH KH\u1ed0I R\u1ec4 C\u00c1M\u00a0R\u1eeaNG T\u1ef0 NHI\u00caN L\u00c1 R\u1ed8NG TH\u01af\u1edcNG XANH T\u1ea0I T\u00c2Y NAM NH\u1eacT B\u1ea2N<\/p>\n

<\/a>Tr\u1ea7n V\u0103n \u0110\u00f41<\/sup>, Nguy\u1ec5n To\u00e0n Th\u1eafng1<\/sup>, V\u0169 Ti\u1ebfn L\u00e2m1<\/sup>, \u0110\u00e0o Trung \u0110\u1ee9c1<\/sup>, Nguy\u1ec5n Tr\u1ecdng Minh2<\/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> Tr\u01b0\u1eddng \u0110\u1ea1i h\u1ecdc L\u00e2m nghi\u1ec7p<\/p>\n\n\n\n\n
T\u00d3M T\u1eaeT<\/p>\n

R\u1ec5 c\u00e1m (\u0111\u01b0\u1eddng k\u00ednh \u2264 2 mm) c\u00f3 ch\u1ee9c n\u0103ng h\u00fat n\u01b0\u1edbc v\u00e0 ch\u1ea5t dinh d\u01b0\u1ee1ng nu\u00f4i c\u00e2y v\u00e0 \u0111\u00f3ng vai tr\u00f2 quan tr\u1ecdng \u0111\u1ed1i v\u1edbi chu tr\u00ecnh carbon v\u00e0 chu tr\u00ecnh dinh d\u01b0\u1ee1ng trong h\u1ec7 sinh th\u00e1i r\u1eebng. K\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u t\u1ea1i r\u1eebng l\u00e1 r\u1ed9ng th\u01b0\u1eddng xanh T\u00e2y Nam Nh\u1eadt B\u1ea3n cho th\u1ea5y, \u0111i\u1ec1u ki\u1ec7n ti\u1ec3u l\u1eadp \u0111\u1ecba nh\u01b0 \u0111\u1ed9 d\u00e0y t\u1ea7ng \u0111\u1ea5t v\u00e0 \u0111\u1ed9 \u0111\u00e1 l\u1eabn \u0111\u00f3ng vai tr\u00f2 quan tr\u1ecdng \u0111\u1ed1i v\u1edbi s\u1ea3n sinh r\u1ec5 c\u00e1m, \u0111\u1ebfn l\u01b0\u1ee3ng r\u1ec5 c\u00e1m ch\u1ebft \u0111i c\u0169ng nh\u01b0 ph\u00e2n h\u1ee7y tr\u1ea3 l\u1ea1i dinh d\u01b0\u1ee1ng cho \u0111\u1ea5t. Trong th\u1eddi gian 1 n\u0103m, t\u1ed5ng l\u01b0\u1ee3ng r\u1ec5 c\u00e1m s\u1ea3n sinh t\u1ea1i l\u1eadp \u0111\u1ecba t\u1ed1t \u0111\u1ea1t 374,4 g m-2<\/sup> trong khi \u0111\u00f3 t\u1ea1i l\u1eadp \u0111\u1ecba x\u1ea5u ch\u1ec9 \u0111\u1ea1t 299,6 g m-2<\/sup>; l\u01b0\u1ee3ng r\u1ec5 c\u00e1m ch\u1ebft \u0111i t\u1ea1i l\u1eadp \u0111\u1ecba t\u1ed1t \u0111\u1ea1t 282,7 g m-2<\/sup> trong khi \u0111\u00f3 t\u1ea1i l\u1eadp \u0111\u1ecba x\u1ea5u ch\u1ec9 \u0111\u1ea1t 204,7 g m-2<\/sup>; v\u00e0 l\u01b0\u1ee3ng r\u1ec5 c\u00e1m ph\u00e2n h\u1ee7y t\u1ea1i l\u1eadp \u0111\u1ecba t\u1ed1t \u0111\u1ea1t 175,5 g m-2<\/sup> trong khi \u0111\u00f3 t\u1ea1i l\u1eadp \u0111\u1ecba x\u1ea5u ch\u1ec9 \u0111\u1ea1t 126,7 g m-2<\/sup>. \u0110i\u1ec1u \u0111\u00f3 cho th\u1ea5y, l\u01b0\u1ee3ng dinh d\u01b0\u1ee1ng tr\u1ea3 l\u1ea1i cho \u0111\u1ea5t t\u1eeb r\u1ec5 c\u00e1m t\u1ea1i l\u1eadp \u0111\u1ecba x\u1ea5u l\u00e0 th\u1ea5p h\u01a1n nhi\u1ec1u so v\u1edbi l\u1eadp \u0111\u1ecba t\u1ed1t; r\u1ec5 c\u00e1m kh\u00f3 c\u00f3 th\u1ec3 c\u1ea3i thi\u1ec7n dinh d\u01b0\u1ee1ng \u0111\u1ea5t t\u1ea1i l\u1eadp \u0111\u1ecba x\u1ea5u.<\/p>\n

T\u1eeb kh\u00f3a:<\/em><\/strong> Khoan \u0111\u1ea5t, r\u1ec5 c\u00e1m, r\u1eebng l\u00e1 r\u1ed9ng th\u01b0\u1eddng xanh, sinh kh\u1ed1i s\u1ea3n sinh, t\u00fai ph\u00e2n h\u1ee7y<\/td>\n<\/tr>\n

\n

<\/a>Effect of microsites on fine root production in evergreen broad-leaved forest, Northwestern, Japan<\/strong><\/p>\n

Fine roots (diameter \u2264 2 mm) function as absorbing water and nutrients to sustain tree\u2019s life and play an important role in carbon cycle and soil nutrient in forest ecosystem. The study results in evergreen broad-leaved, Northwestern Japan indicated that microsites such as soil depth play an important role in fine root production, and then mortality and decomposition for nutrient return to the soil. In a duration of a year, total fine root production in good microsite was 374.4 g m-2<\/sup>, while in poor microsite it was 299.6 g m-2<\/sup>; mortality in good microsite was 282.7 g m-2<\/sup>, while in poor microsite it was 204.7 g m-2<\/sup>; and decomposition in good microsite was 175.5 g m-2<\/sup>, while in poor microsite it was 126.7 g m-2<\/sup>. It indicated that nutrient return to the soil in poor microsite was much lower than that in good microsite; it is not easy to improve soil fertility in poor microsite from fine root decomposition.<\/p>\n

Keywords:<\/em><\/strong> Evergreen broadleaved forest, fine root, litterbag, production, soil-coring<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

<\/a>\u0110\u00c1NH GI\u00c1 TH\u1ef0C TR\u1ea0NG R\u1eeaNG TR\u1ed2NG KEO T\u1ea0I T\u1ec8NH QU\u1ea2NG NINH<\/p>\n

<\/a>Ph\u1ea1m V\u0103n Vi\u1ec7n1<\/sup>, V\u0169 Duy V\u0103n2<\/sup>, Ho\u00e0ng V\u0103n Th\u1eafng1<\/sup>, L\u00ea V\u0103n Quang3<\/sup>, Cao V\u0103n L\u1ea1ng1<\/sup>, Ho\u00e0ng V\u0103n Th\u00e0nh3<\/sup>, D\u01b0\u01a1ng Quang Trung3<\/sup>, Nguy\u1ec5n Vi\u1ec7t C\u01b0\u1eddng3<\/sup>, Nguy\u1ec5n V\u0103n Tu\u1ea5n3<\/sup><\/p>\n

1\u00a0Vi\u1ec7n Khoa h\u1ecdc L\u00e2m nghi\u1ec7p Vi\u1ec7t Nam
\n2 S\u1edf N\u00f4ng nghi\u1ec7p v\u00e0 Ph\u00e1t tri\u1ec3n n\u00f4ng th\u00f4n t\u1ec9nh Qu\u1ea3ng Ninh
\n3 Vi\u1ec7n Nghi\u00ean c\u1ee9u L\u00e2m sinh<\/p>\n\n\n\n\n
T\u00d3M T\u1eaeT<\/p>\n

Keo tai t\u01b0\u1ee3ng v\u00e0 keo lai l\u00e0 2 lo\u00e0i c\u00e2y tr\u1ed3ng r\u1eebng ch\u1ee7 l\u1ef1c c\u1ee7a t\u1ec9nh Qu\u1ea3ng Ninh, v\u1edbi t\u1ed5ng di\u1ec7n t\u00edch \u0111\u1ebfn n\u0103m 2019 l\u00e0 167.215,4 ha, chi\u1ebfm 67,5% t\u1ed5ng di\u1ec7n t\u00edch r\u1eebng tr\u1ed3ng to\u00e0n t\u1ec9nh, trong \u0111\u00f3 Keo tai t\u01b0\u1ee3ng chi\u1ebfm tr\u00ean 80% di\u1ec7n t\u00edch r\u1eebng tr\u1ed3ng keo c\u1ee7a t\u1ec9nh. Sau nhi\u1ec1u chu k\u1ef3 canh t\u00e1c, ch\u1ea5t l\u01b0\u1ee3ng l\u1eadp \u0111\u1ecba r\u1eebng tr\u1ed3ng keo t\u1ea1i Qu\u1ea3ng Ninh \u0111\u00e3 b\u1ecb suy gi\u1ea3m, t\u1ea7ng \u0111\u1ea5t m\u1ecfng (\u0111\u1ed9 d\u00e0y t\u1ea7ng \u0111\u1ea5t 50 – 70 cm chi\u1ebfm t\u1edbi 86,9% t\u1ed5ng di\u1ec7n t\u00edch \u0111\u1ea5t \u0111\u1ed3i n\u00fai to\u00e0n t\u1ec9nh), \u0111\u1ea5t chua, ngh\u00e8o dinh d\u01b0\u1ee1ng \u0111\u00e3 l\u00e0m gi\u1ea3m n\u0103ng su\u1ea5t r\u1eebng tr\u1ed3ng. C\u00e1c lo\u00e0i keo t\u1ea1i Qu\u1ea3ng Ninh \u0111\u01b0\u1ee3c tr\u1ed3ng v\u1edbi m\u1eadt \u0111\u1ed9 dao \u0111\u1ed9ng t\u1eeb 1.100 c\u00e2y\/ha \u0111\u1ebfn h\u01a1n 4.000 c\u00e2y\/ha, trong \u0111\u00f3 m\u1eadt \u0111\u1ed9 tr\u1ed3ng ph\u1ed5 bi\u1ebfn l\u00e0 2.000 – 2.500 c\u00e2y\/ha. Tr\u1eef l\u01b0\u1ee3ng r\u1eebng tr\u1ed3ng keo \u1edf tu\u1ed5i khai th\u00e1c ph\u1ed5 bi\u1ebfn (5 – 7 tu\u1ed5i) c\u00f3 s\u1ef1 bi\u1ebfn \u0111\u1ed9ng l\u1edbn, t\u1eeb 80,0 – 134,1 m3<\/sup>\/ha, t\u01b0\u01a1ng \u0111\u01b0\u01a1ng l\u01b0\u1ee3ng t\u0103ng tr\u01b0\u1edfng b\u00ecnh qu\u00e2n n\u0103m v\u1ec1 tr\u1eef l\u01b0\u1ee3ng dao \u0111\u1ed9ng t\u1eeb 14,2 – 23,3 m3<\/sup>\/ha\/n\u0103m, trung b\u00ecnh \u0111\u1ea1t 113,3 m3<\/sup>\/ha \u0111\u1ed1i v\u1edbi r\u1eebng tr\u1ed3ng Keo tai t\u01b0\u1ee3ng v\u00e0 102,6 m3<\/sup>\/ha \u0111\u1ed1i v\u1edbi r\u1eebng tr\u1ed3ng keo lai. T\u1ef7 l\u1ec7 s\u1ed1 c\u00e2y b\u1ecb s\u00e2u, b\u1ec7nh h\u1ea1i trong c\u00e1c r\u1eebng tr\u1ed3ng Keo tai t\u01b0\u1ee3ng trung b\u00ecnh chi\u1ebfm 22,7% cao h\u01a1n nhi\u1ec1u so v\u1edbi r\u1eebng tr\u1ed3ng keo lai ch\u1ec9 l\u00e0 6,4%. Tuy nhi\u00ean, m\u1ee9c \u0111\u1ed9 s\u00e2u, b\u1ec7nh h\u1ea1i r\u1eebng tr\u1ed3ng keo \u1edf Qu\u1ea3ng Ninh ch\u01b0a th\u1ef1c s\u1ef1 nghi\u00eam tr\u1ecdng khi \u0111a s\u1ed1 c\u00e2y b\u1ecb h\u1ea1i trong c\u00e1c r\u1eebng tr\u1ed3ng keo ch\u1ec9 \u1edf m\u1ee9c g\u00e2y h\u1ea1i c\u1ea5p 1 (t\u1ef7 l\u1ec7 t\u00e1n l\u00e1 b\u1ecb s\u00e2u, b\u1ec7nh \u2264 25% ho\u1eb7c t\u1ef7 l\u1ec7 c\u00e0nh b\u1ecb s\u00e2u, b\u1ec7nh \u2264 10%).<\/p>\n

T\u1eeb kh\u00f3a:<\/em><\/strong> Hi\u1ec7n tr\u1ea1ng, r\u1eebng tr\u1ed3ng keo, Qu\u1ea3ng Ninh<\/td>\n<\/tr>\n

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<\/a>Assessment of acacia plantation status in Quang Ninh province<\/strong><\/p>\n

Acacia mangium<\/em> and Acacia hybrid are the two main species for planting in Quang Ninh province, with a total area of \u200b\u200b167,215.4 hectares by 2019, accounting for 67.5% of the total plantation area of \u200b\u200bthe province, of which Acacia mangium<\/em> accounting for over 80% of the province’s acacia plantations. After many cultivation cycles, the quality of the site of acacia plantations in Quang Ninh has been reduced, the soil layer is thin (the soil thickness of 50 – 70cm accounts for 86.9% of the total area of \u200b\u200bhilly and mountainous land in the province). Poor nutrition has reduced productivity of plantation. Acacia species in Quang Ninh are planted with density ranging from 1,100 trees\/ha to more than 4,000 trees\/ha, of which the common planting density is 2,000 – 2,500 trees\/ha. The volume of acacia plantations at the common harvesting age (5 – 7 years) has a large variation, from 80.0 – 134.1 m3<\/sup>\/ha, equivalent to the average annual growth volume ranging from 14.2 – 23.3 m3<\/sup>\/ha\/year, an average of 113.3 m3<\/sup>\/ha for Acacia mangium<\/em> plantations and 102.6 m3<\/sup>\/ha for acacia hybrid plantations. The percentage of trees affected by pests and diseases in Acacia mangium<\/em> platation averaged 22.7%, much higher than that of acacia hybrid plantations, only 6.4%. However, the level of pests and diseases in Acacia plantations in Quang Ninh is not really serious when most of the damaged trees in acacia plantations are only at level 1 (rate of leaf canopy being pests and diseases \u2264 25% or the rate of branches being pests and diseases \u2264 10%).<\/p>\n

Keywords:<\/em><\/strong> Acacia plantation, status, Quang Ninh province<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

<\/a>NGHI\u00caN C\u1ee8U M\u1ed8T S\u1ed0 BI\u1ec6N PH\u00c1P K\u1ef8 THU\u1eacT\u00a0TR\u1ed2NG R\u1eeaNG TH\u00c2M CANH D\u1eba \u0110\u1ece (Lithocarpus ducampii<\/em> A. Camus) CUNG C\u1ea4P G\u1ed6 L\u1edaN T\u1ea0I T\u1ec8NH PH\u00da TH\u1ecc<\/p>\n

<\/a>\u0110\u00e0o H\u00f9ng M\u1ea1nh1<\/sup>, Nguy\u1ec5n Anh D\u0169ng1<\/sup>, V\u00f5 \u0110\u1ea1i Nguy\u00ean2<\/sup><\/p>\n

[1]<\/strong>Trung t\u00e2m Khoa h\u1ecdc L\u00e2m nghi\u1ec7p v\u00f9ng Trung t\u00e2m B\u1eafc B\u1ed9
\n2<\/sup>Sinh vi\u00ean 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 m\u00f4\u0323t s\u00f4\u0301 bi\u1ec7n ph\u00e1p k\u1ef9 thu\u1eadt tr\u1ed3ng r\u1eebng th\u00e2m canh D\u1ebb \u0111\u1ecf t\u1ea1i Ph\u00fa Th\u1ecd g\u00f3p ph\u1ea7n b\u1ed5 sung c\u01a1 s\u1edf khoa h\u1ecdc cho tr\u1ed3ng r\u1eebng cung c\u1ea5p g\u1ed7 l\u1edbn phu\u0323c vu\u0323 \u0111\u00ea\u0300 a\u0301n ta\u0301i c\u01a1 c\u00e2\u0301u nga\u0300nh l\u00e2m nghi\u00ea\u0323p. T\u1ea1i m\u00f4 h\u00ecnh th\u00ed nghi\u1ec7m b\u00f3n ph\u00e2n 40 th\u00e1ng tu\u1ed5i, t\u1ef7 l\u1ec7 s\u1ed1ng c\u1ee7a m\u00f4 h\u00ecnh t\u1eeb 90,91 – 94,95%. Sinh tr\u01b0\u1edfng b\u00ecnh qu\u00e2n \u1edf c\u00f4ng th\u1ee9c b\u00f3n th\u00fac NPK l\u1edbn nh\u1ea5t v\u1edbi Do<\/sub> = 4,59 cm, Hvn<\/sub> = 459,1 cm. T\u0103ng tr\u01b0\u1edfng b\u00ecnh qu\u00e2n v\u1ec1 \u0111\u01b0\u1eddng k\u00ednh \u1edf m\u1ee9c t\u0103ng tr\u01b0\u1edfng nhanh \u0111\u1ea1t 1,16 cm\/n\u0103m. T\u1ef7 l\u1ec7 c\u00e2y ch\u1ea5t l\u01b0\u1ee3ng t\u1ed1t dao \u0111\u1ed9ng t\u1eeb 74,5 – 87,9%, c\u00e2y ch\u1ea5t l\u01b0\u1ee3ng trung b\u00ecnh t\u1eeb 12,1 – 15,5%, c\u00e2y ch\u1ea5t l\u01b0\u1ee3ng x\u1ea5u t\u1eeb 0,0 – 12,3%. T\u1ea1i th\u00ed nghi\u1ec7m m\u1eadt \u0111\u1ed9 30 th\u00e1ng tu\u1ed5i, t\u1ef7 l\u1ec7 s\u1ed1ng c\u1ee7a m\u00f4 h\u00ecnh m\u1eadt \u0111\u1ed9 t\u1eeb 92,1 – 92,9%. Sinh tr\u01b0\u1edfng b\u00ecnh qu\u00e2n \u0111\u01b0\u1eddng k\u00ednh g\u1ed1c \u1edf c\u00e1c c\u00f4ng th\u1ee9c \u0111\u1ea1t Do<\/sub> = 2,93 cm, Hvn<\/sub> = 266,2 cm. T\u0103ng tr\u01b0\u1edfng b\u00ecnh qu\u00e2n v\u1ec1 \u0111\u01b0\u1eddng k\u00ednh \u1edf m\u1ee9c t\u0103ng tr\u01b0\u1edfng nhanh v\u1edbi DD = 1,11 cm\/n\u0103m. T\u1ef7 l\u1ec7 c\u00e2y ch\u1ea5t l\u01b0\u1ee3ng t\u1ed1t t\u1eeb 80,3 – 82,2%, c\u00e2y ch\u1ea5t l\u01b0\u1ee3ng trung b\u00ecnh t\u1eeb 10,5 – 14,6%, c\u00e2y ch\u1ea5t l\u01b0\u1ee3ng x\u1ea5u t\u1eeb 5,1 – 7,2%. T\u1ea1i th\u00ed nghi\u1ec7m ti\u00eau chu\u1ea9n c\u00e2y con 20 th\u00e1ng tu\u1ed5i, t\u1ef7 l\u1ec7 s\u1ed1ng t\u1eeb 91,9 – 92,9%. Sinh tr\u01b0\u1edfng \u0111\u01b0\u1eddng k\u00ednh g\u1ed1c b\u00ecnh qu\u00e2n \u1edf c\u00f4ng th\u1ee9c ti\u00eau chu\u1ea9n c\u00e2y 18 th\u00e1ng tu\u1ed5i c\u00f3 sinh tr\u01b0\u1edfng b\u00ecnh qu\u00e2n l\u1edbn nh\u1ea5t v\u1edbi Do<\/sub> = 2,95 cm, Hvn<\/sub> = 268,5 cm. T\u0103ng tr\u01b0\u1edfng b\u00ecnh qu\u00e2n v\u1ec1 \u0111\u01b0\u1eddng k\u00ednh \u1edf m\u1ee9c t\u0103ng tr\u01b0\u1edfng nhanh v\u1edbi DD = 1,06 cm\/n\u0103m. T\u1ef7 l\u1ec7 c\u00e2y ch\u1ea5t l\u01b0\u1ee3ng t\u1ed1t t\u1eeb 79,4 – 81,3%, c\u00e2y ch\u1ea5t l\u01b0\u1ee3ng trung b\u00ecnh t\u1eeb 12,1 – 14,1%, c\u00e2y ch\u1ea5t l\u01b0\u1ee3ng x\u1ea5u t\u1eeb 5,4 – 6,6%.<\/p>\n

T\u1eeb kh\u00f3a:<\/em><\/strong> D\u1ebb \u0111\u1ecf, b\u00f3n ph\u00e2n, sinh tr\u01b0\u1edfng, Ph\u00fa Th\u1ecd<\/td>\n<\/tr>\n

\n

<\/a>Research on some intensive planting techniques of growing Lithocarpus ducampii <\/em>A. Camus forest for larger size timber in phu tho province<\/strong><\/p>\n

The research result of some intensive planting techniques of growing Lithocarpus ducampii<\/em> in Phu Tho province contribute to supplementing scientific basis for afforestation to provide large size timber to serve the forestry sector restructuring project. At 40 months old fertilizing experiment formula, the survival rate of model is from 90.91 – 94.95%. The average growth of top dressing NPK formula is biggest with D0 = 4.59 cm, Hvn<\/sub> = 459.1 cm. Average growth in diameter at a rapid growth rate is 1.16 cm\/year. The rate of good quality trees range from 74.5 – 87.9%, medium quality trees range from 12.1 – 15.5%, and bad quality trees range from 0.0 – 12.3%. At 30 months old density experiment, the survival rate of the density model is from 92.1 to 92.9%. The average growth of stump diameter in the formulas reached D0 = 2.93 cm, Hvn<\/sub> = 266.2 cm. The average growth in diameter at a rapid growth rate is 1,11 cm\/year. The rate of good quality trees range from 80.3 – 82.2%, medium quality trees range from 10.5 – 14.6%, and bad quality trees range from 5.1 – 7.2%. At 20 months old seedling standard experiment, the survival rate is from 91.9 – 92.9%. The average growth of stump diameter in the 18 months old seedling standard formulas has biggest average growth rate with D0 = 2.95 cm, Hvn<\/sub> = 268.5 cm. The average growth in diameter at a rapid growth rate is DD = 1.06 cm\/year. The rate of good quality trees range from 79.4 – 81.3%, medium quality trees range from 12.1 – 14.1%, and bad quality trees range from 5.4 – 6.6%.<\/p>\n

Keywords:<\/em><\/strong> Lithrocarpus ducampii<\/em>, fertilize, growth, Phu Tho<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

<\/a>TH\u1ef0C TR\u1ea0NG V\u00c0 GI\u1ea2I PH\u00c1P PH\u00c1T TRI\u1ec2N R\u1eeaNG TR\u1ed2NG KEO LAI THEO H\u01af\u1edaNG KINH DOANH G\u1ed6 L\u1edaN QUY M\u00d4 H\u1ed8 GIA \u0110\u00ccNH\u00a0T\u1ea0I T\u1ec8NH QU\u1ea2NG TR\u1eca<\/p>\n

<\/a>Tr\u1ea7n Th\u1ecb Th\u00fay H\u1eb1ng, Ho\u00e0ng Huy Tu\u1ea5n, Ph\u1ea1m C\u01b0\u1eddng<\/p>\n

Tr\u01b0\u1eddng \u0110\u1ea1i h\u1ecdc N\u00f4ng L\u00e2m, \u0110\u1ea1i h\u1ecdc Hu\u1ebf<\/p>\n\n\n\n\n
T\u00d3M T\u1eaeT<\/p>\n

Tr\u1ed3ng r\u1eebng theo h\u01b0\u1edbng kinh doanh g\u1ed7 l\u1edbn l\u00e0 m\u1ed9t trong nh\u1eefng gi\u1ea3i ph\u00e1p quan tr\u1ecdng \u0111\u1ec3 th\u1ef1c hi\u1ec7n chi\u1ebfn l\u01b0\u1ee3c t\u00e1i c\u01a1 c\u1ea5u ng\u00e0nh l\u00e2m nghi\u1ec7p. T\u00ednh \u0111\u1ebfn n\u0103m 2019, to\u00e0n t\u1ec9nh Qu\u1ea3ng Tr\u1ecb c\u00f3 3.687,7 ha r\u1eebng tr\u1ed3ng keo theo h\u01b0\u1edbng kinh doanh g\u1ed7 l\u1edbn, trong \u0111\u00f3 r\u1eebng do c\u00e1c h\u1ed9 gia \u0111\u00ecnh tr\u1ed3ng l\u00e0 914,5 (chi\u1ebfm 24,8%). K\u1ebft qu\u1ea3 \u0111\u00e1nh gi\u00e1 t\u00ecnh h\u00ecnh sinh tr\u01b0\u1edfng c\u00e1c m\u00f4 h\u00ecnh tr\u1ed3ng r\u1eebng g\u1ed7 l\u1edbn \u1edf \u0111\u1ecba b\u00e0n nghi\u00ean c\u1ee9u (huy\u1ec7n Cam L\u1ed9 v\u00e0 huy\u1ec7n H\u1ea3i L\u0103ng) cho th\u1ea5y: m\u00f4 h\u00ecnh tr\u1ed3ng r\u1eebng th\u00e2m canh g\u1ed7 l\u1edbn (tu\u1ed5i 5) c\u00f3 sinh tr\u01b0\u1edfng cao h\u01a1n so v\u1edbi m\u00f4 h\u00ecnh tr\u1ed3ng r\u1eebng g\u1ed7 nh\u1ecf. R\u1eebng chuy\u1ec3n h\u00f3a g\u1ed7 nh\u1ecf sang g\u1ed7 l\u1edbn \u1edf tu\u1ed5i 8 \u0111\u00e3 \u0111\u1ea1t tr\u00ean 70% c\u00e2y \u0111\u1ee9ng c\u00f3 D1,3<\/sub> t\u1eeb 15 cm tr\u1edf l\u00ean (\u0111\u1ea1t y\u00eau c\u1ea7u g\u1ed7 l\u1edbn \u0111\u1ed1i v\u1edbi th\u1ecb tr\u01b0\u1eddng), c\u00e1c h\u1ed9 gia \u0111\u00ecnh \u0111\u00e3 b\u00e1n r\u1eebng chuy\u1ec3n h\u00f3a \u1edf tu\u1ed5i 8 nh\u1eb1m h\u1ea1n ch\u1ebf \u0111\u01b0\u1ee3c r\u1ee7i ro do gi\u00f3, b\u00e3o v\u00e0 ch\u00e1y r\u1eebng. Ph\u00e1t tri\u1ec3n c\u00e1c m\u00f4 h\u00ecnh tr\u1ed3ng r\u1eebng keo lai cung c\u1ea5p g\u1ed7 l\u1edbn \u1edf quy m\u00f4 h\u1ed9 gia \u0111\u00ecnh \u1edf t\u1ec9nh Qu\u1ea3ng Tr\u1ecb b\u1ecb chi ph\u1ed1i b\u1edfi nhi\u1ec1u y\u1ebfu t\u1ed1 kh\u00e1c nhau v\u00e0 \u0111\u01b0\u1ee3c chia th\u00e0nh 4 nh\u00f3m nh\u00e2n t\u1ed1 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn tr\u1ed3ng r\u1eebng g\u1ed7 l\u1edbn: (i) \u0110\u1eb7c \u0111i\u1ec3m c\u1ee7a khu \u0111\u1ea5t tr\u1ed3ng r\u1eebng (\u0111\u1ed9 d\u1ed1c, thi\u00ean tai); (ii) N\u0103ng l\u1ef1c c\u1ee7a h\u1ed9 gia \u0111\u00ecnh (di\u1ec7n t\u00edch r\u1eebng tr\u1ed3ng, ngu\u1ed3n v\u1ed1n, chu k\u1ef3 kinh doanh, k\u1ef9 thu\u1eadt tr\u1ed3ng r\u1eebng g\u1ed7 l\u1edbn); (iii) Ch\u00ednh s\u00e1ch h\u1ed7 tr\u1ee3 c\u1ee7a Nh\u00e0 n\u01b0\u1edbc; v\u00e0 (iv) Th\u1ecb tr\u01b0\u1eddng. Vi\u1ec7c ra quy\u1ebft \u0111\u1ecbnh tr\u1ed3ng r\u1eebng g\u1ed7 l\u1edbn c\u1ee7a h\u1ed9 gia \u0111\u00ecnh b\u1ecb chi ph\u1ed1i b\u1edfi 5 nh\u00e2n t\u1ed1: thi\u00ean tai, ngu\u1ed3n v\u1ed1n, chu k\u1ef3 kinh doanh, gi\u00e1 g\u1ed7 v\u00e0 di\u1ec7n t\u00edch \u0111\u1ea5t tr\u1ed3ng r\u1eebng.<\/p>\n

T\u1eeb kh\u00f3a:<\/em><\/strong> G\u1ed7 l\u1edbn, h\u1ed9 gia \u0111\u00ecnh, keo lai, Qu\u1ea3ng Tr\u1ecb, th\u1ef1c tr\u1ea1ng<\/td>\n<\/tr>\n

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<\/a>Current situation and solutions for developing sawn timber-oriented acacia hybrid plantation at household scale in Quang Tri province<\/strong><\/p>\n

Sawn timber-oriented plantation is one of the important solutions to implement the strategy of forestry sector reconstruction. As of 2019, the whole province of Quang Tri has 3,687.7 ha of acacia hybrid plantation towards sawn timber business, of which forest planted by households is 914.5 ha (accounting for 24.8%). The results of assessment of the growth of sawn timber forest plantation models in the study area (Cam Lo and Hai Lang district) showed that: the sawn timber intensive plantation model (age 5) had higher growth than with small timber plantation model. The forest is converted from small timber into sawn timber at the age of 8 has over 70% standing trees with D1.3<\/sub> from 15 cm or more (meeting the requirements of sawn timber for the market), the households have sold these forest to reduce risks that are caused by wind, storms and forest fires. Development of sawn timber-oriented acacia hybird plantation models at household scale in Quang Tri province are affected by various factors and is divided into 4 groups: (i) Characteristics of land for plantation (slope, natural calamity\/disaster); (ii) Household capacity (forestry land area, capital, rotation, sawn timber-oriented forest plantation techniques); (iii) Support state policies (capital support, technical assistance); and (iv) The market. Household\u2019s decision-making is dominated by five factors: natural disasters, capital, rotation, sawn timber prices, and land areas for forest plantation.<\/p>\n

Keywords: <\/em>Acacia hybrid, curent situation, household, Quang Tri, sawn timber<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

<\/a>THI\u1ebeT K\u1ebe CH\u1ebe T\u1ea0O H\u1ec6 TH\u1ed0NG THI\u1ebeT B\u1eca\u00a0S\u1ea4Y G\u1ed6 X\u1eba R\u1eeaNG TR\u1ed2NG B\u1eb0NG N\u0102NG L\u01af\u1ee2NG M\u1eb6T TR\u1edcI<\/p>\n

<\/a>B\u00f9i Duy Ng\u1ecdc<\/p>\n

\u00a0 <\/strong>Vi\u1ec7n Nghi\u00ean c\u1ee9u C\u00f4ng nghi\u1ec7p r\u1eebng<\/p>\n\n\n\n\n
T\u00d3M T\u1eaeT<\/p>\n

H\u1ec7 th\u1ed1ng thi\u1ebft b\u1ecb s\u1ea5y g\u1ed7 x\u1ebb r\u1eebng tr\u1ed3ng b\u1eb1ng n\u0103ng l\u01b0\u1ee3ng m\u1eb7t tr\u1eddi (NLMT) c\u00f3 m\u00e1i h\u00ecnh v\u00f2m l\u1eafp theo h\u01b0\u1edbng \u0110\u00f4ng – T\u00e2y. K\u1ebft c\u1ea5u m\u00e1i g\u1ed3m l\u1edbp polyme trong su\u1ed1t. L\u1edbp v\u1eadt li\u1ec7u h\u1ea5p th\u1ee5 NLMT v\u00e0 l\u1edbp d\u01b0\u1edbi c\u00f9ng l\u00e0 t\u00f4n l\u1ea1nh \u0111\u1ec3 gi\u1eef c\u00e1c t\u1ea5m h\u1ea5p th\u1ee5 nhi\u1ec7t. M\u00e1i l\u00f2 s\u1ea5y c\u00f3 h\u1ec7 s\u1ed1 h\u1ea5p th\u1ee5 NLMT tr\u00ean 90%; nhi\u1ec7t \u0111\u1ed9 kh\u00f4ng kh\u00ed xung quanh l\u1edbp h\u1ea5p th\u1ee5 c\u00f3 th\u1ec3 \u0111\u1ea1t t\u1edbi 70o<\/sup>C t\u00f9y thu\u1ed9c v\u00e0o th\u1eddi ti\u1ebft. Dung t\u00edch l\u00f2 s\u1ea5y \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ea1t 120 m3<\/sup>. C\u00f4ng su\u1ea5t s\u1ea5y: 40 m3<\/sup> g\u1ed7 x\u1ebb\/1 m\u1ebb s\u1ea5y. H\u1ec7 th\u1ed1ng tu\u1ea7n ho\u00e0n g\u1ed3m 05 qu\u1ea1t gi\u00f3 c\u00f3 thi\u1ebft k\u1ebf \u0111\u1ea3o chi\u1ec1u quay \u0111\u01b0\u1ee3c \u0111\u1eb7t \u1edf gi\u1eefa m\u00e1i, \u0111\u1ec3 gi\u00f3 \u0111\u01b0\u1ee3c th\u1ed5i xu\u1ed1ng ho\u1eb7c h\u00fat l\u00ean. H\u1ec7 th\u1ed1ng qu\u1ea1t h\u00fat \u1ea9m ra m\u00f4i tr\u01b0\u1eddng b\u00ean ngo\u00e0i g\u1ed3m 04 chi\u1ebfc \u0111\u1eb7t \u1edf hai b\u00ean th\u00e0nh l\u00f2 s\u1ea5y. Thi\u1ebft b\u1ecb \u0111i\u1ec1u khi\u1ec3n l\u00f2 s\u1ea5y b\u00e1n t\u1ef1 \u0111\u1ed9ng LG-38 Helios ghi d\u1eef li\u1ec7u t\u1eeb 02 \u0111\u1ea7u d\u00f2 nhi\u1ec7t \u0111\u1ed9 (kh\u00f4 v\u00e0 \u01b0\u1edbt) c\u1ee7a m\u00f4i tr\u01b0\u1eddng; 04 d\u00e2y c\u1ea3m bi\u1ebfn \u0111o \u0111\u1ed9 \u1ea9m g\u1ed7 v\u00e0 h\u1eb9n gi\u1edd \u0111\u1ea3o chi\u1ec1u qu\u1ea1t gi\u00f3. L\u00f2 s\u1ea5y g\u1ed7 b\u1eb1ng NLMT th\u00edch h\u1ee3p v\u1edbi khu v\u1ef1c mi\u1ec1n Trung v\u00e0 mi\u1ec1n Nam.<\/p>\n

T\u1eeb kh\u00f3a:<\/em> <\/strong>N\u0103ng l\u01b0\u1ee3ng m\u1eb7t tr\u1eddi, s\u1ea5y g\u1ed7 x\u1ebb<\/td>\n<\/tr>\n

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<\/a>Construction and evaluation of a timber-drying solar kiln<\/strong><\/p>\n

The solar-assisted drying of timber at industrial scale has a dome-shaped roof and requires the installation of the dome to be East-West direction. The roof structure consists of 3 layers: The outer layer is transparent sheet while the middle layer is a solar absorbent material. The bottom layer is steel sheet to keep the absorbing heat panels. The roof can absorb sunlight with an absorption efficiency of over 90%, the air temperature around the absorber layer can reach 70o<\/sup>C depending on the weather condition. Drying volume: 120 m3<\/sup>, drying capacity: 40 m3<\/sup> of sawn timber per time. Air circulation system: 05 fans with reverse rotation function. The fan system is located in the middle of the roof and blows the air down or up. The dehumidify system consists of 04 fans placed on both side of the drying oven. Control device is LG-38 Helios semi-automatic oven controller that records data from 02 temperature probes (dry and wet) of the environment; 04 sensors were used for measuring wood moisture and timer reversing the fan. The solar kiln plan is suitable for the Central and Southern regions.<\/p>\n

Keywords:<\/em> S<\/strong>olar energy, solar wood drying<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

<\/a>M\u1ed8T S\u1ed0 \u0110\u1eb6C \u0110I\u1ec2M C\u1ea4U T\u1ea0O\u00a0C\u1ee6A G\u1ed6 KEO TAI T\u01af\u1ee2NG (Acacia mangium <\/em>Willd.)\u00a0\u1ea2NH H\u01af\u1edeNG \u0110\u1ebeN QU\u00c1 TR\u00ccNH S\u1ea4Y<\/p>\n

<\/a>H\u00e0 Ti\u1ebfn M\u1ea1nh1<\/sup>, Ph\u1ea1m V\u0103n Ch\u01b0\u01a1ng2<\/sup>, B\u00f9i Duy Ng\u1ecdc1<\/sup>, \u0110\u1ed7 V\u0103n B\u1ea3n1<\/sup>,
\nNguy\u1ec5n \u0110\u1ee9c Th\u00e0nh1<\/sup>, B\u00f9i H\u1eefu Th\u01b0\u1edfng1<\/sup><\/p>\n

1 <\/sup>Vi\u1ec7n Nghi\u00ean c\u1ee9u C\u00f4ng nghi\u1ec7p r\u1eebng
\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

Nghi\u00ean c\u1ee9u n\u00e0y \u0111\u00e3 x\u00e1c \u0111\u1ecbnh \u0111\u01b0\u1ee3c m\u1ed9t s\u1ed1 \u0111\u1eb7c \u0111i\u1ec3m c\u1ea5u t\u1ea1o v\u00e0 \u0111\u1ed9 r\u1ed7ng c\u1ee7a g\u1ed7 Keo tai t\u01b0\u1ee3ng (Acacia mangium <\/em>Willd.) 9 tu\u1ed5i, \u0111\u01b0\u1ee3c khai th\u00e1c t\u1ea1i x\u00e3 Ng\u1ecdc Thanh, th\u00e0nh ph\u1ed1 Ph\u00fac Y\u00ean, t\u1ec9nh V\u0129nh Ph\u00fac l\u00e0m c\u01a1 s\u1edf ph\u00e2n t\u00edch \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn qu\u00e1 tr\u00ecnh v\u1eadn chuy\u1ec3n \u1ea9m v\u00e0 c\u00e1c hi\u1ec7n t\u01b0\u1ee3ng khi s\u1ea5y. C\u00e1c m\u00f4 t\u1ea3 \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n khi quan s\u00e1t \u1ea3nh hi\u1ec3n vi quang h\u1ecdc (OM) v\u00e0 \u1ea3nh hi\u1ec3n vi \u0111i\u1ec7n t\u1eed qu\u00e9t (SEM) \u0111\u01b0\u1ee3c ch\u1ee5p \u1edf 3 m\u1eb7t c\u1eaft ngang, xuy\u00ean t\u00e2m v\u00e0 ti\u1ebfp tuy\u1ebfn. K\u1ebft qu\u1ea3 cho th\u1ea5y c\u1ea5u t\u1ea1o m\u1ea1ch ph\u00e2n t\u00e1n v\u00e0 m\u00e0ng l\u1ed7 th\u00f4ng ngang tr\u00ean c\u00e1c t\u1ebf b\u00e0o kh\u00f4ng c\u00f3 n\u00fat, lu\u00f4n t\u1ed3n t\u1ea1i c\u00e1c l\u1ed7 m\u1edf l\u00e0m cho ch\u00eanh l\u1ec7ch th\u1ea5m d\u1eabn gi\u1eefa g\u1ed7 s\u1edbm – g\u1ed7 mu\u1ed9n v\u00e0 gi\u1eefa c\u00e1c th\u00e0nh ph\u1ea7n g\u1ed7 theo h\u01b0\u1edbng xuy\u00ean t\u00e2m khi s\u1ea5y l\u00e0 kh\u00f4ng c\u00f3. M\u1ea1ch \u0111\u01a1n ho\u1eb7c k\u00e9p 2, k\u00e9p 3 l\u00e0 \u0111i\u1ec1u ki\u1ec7n thu\u1eadn l\u1ee3i cho qu\u00e1 tr\u00ecnh v\u1eadn chuy\u1ec3n \u1ea9m theo chi\u1ec1u d\u1ecdc th\u1edb. L\u1ed7 m\u1ea1ch c\u00f3 \u0111\u01b0\u1eddng k\u00ednh theo h\u01b0\u1edbng ti\u1ebfp tuy\u1ebfn l\u00e0 88 – 200 \u00b5m, c\u00f3 s\u1ed1 l\u01b0\u1ee3ng 5 – 8 l\u1ed7\/mm\u00b2. L\u1ed7 xuy\u00ean m\u1ea1ch \u0111\u01a1n, c\u00f3 g\u1edd m\u1ecfng t\u1ea1o \u0111i\u1ec1u ki\u1ec7n thu\u1eadn l\u1ee3i cho \u1ea9m v\u1eadn chuy\u1ec3n d\u1ecdc th\u1edb. T\u1ef7 l\u1ec7 gi\u1eefa \u0111\u01b0\u1eddng k\u00ednh ru\u1ed9t tr\u00ean \u0111\u1ed9 d\u00e0y v\u00e1ch t\u1ebf b\u00e0o s\u1ee3i g\u1ed7 l\u00e0 4,09. \u0110\u00e2y l\u00e0 l\u00fd do d\u1eabn \u0111\u1ebfn m\u1ee9c \u0111\u1ed9 mo m\u00f3p c\u1ee7a g\u1ed7 Keo tai t\u01b0\u1ee3ng khi s\u1ea5y r\u1ea5t l\u1edbn. C\u1ea5u t\u1ea1o t\u1ebf b\u00e0o m\u00f4 m\u1ec1m d\u1ecdc v\u00e0 tia g\u1ed7 \u0111\u00e3 \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh, ch\u00fang kh\u00f4ng \u1ea3nh h\u01b0\u1edfng nhi\u1ec1u \u0111\u1ebfn v\u1eadn chuy\u1ec3n \u1ea9m nh\u01b0ng l\u00e0 m\u1ed9t c\u01a1 s\u1edf \u0111\u1ec3 gi\u1ea3i th\u00edch c\u00e1c khuy\u1ebft t\u1eadt khi s\u1ea5y. Ch\u1ea5t t\u00edch t\u1ee5 m\u00e0u n\u00e2u \u0111\u1ecf trong \u1ed1ng m\u1ea1ch, trong tia g\u1ed7 v\u00e0 tinh th\u1ec3 h\u00ecnh l\u0103ng tr\u1ee5 n\u1eb1m trong t\u1ebf b\u00e0o m\u00f4 m\u1ec1m d\u1ecdc l\u00e0m c\u1ea3n tr\u1edf qu\u00e1 tr\u00ecnh v\u1eadn chuy\u1ec3n \u1ea9m. Vi\u1ec7c t\u00ednh to\u00e1n \u0111\u1ed9 r\u1ed7ng c\u1ee7a s\u1ee3i g\u1ed7 v\u00e0 l\u1ed7 m\u1ea1ch \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n th\u00f4ng qua vi\u1ec7c x\u00e1c \u0111\u1ecbnh di\u1ec7n t\u00edch l\u1ed7 r\u1ed7ng tr\u00ean di\u1ec7n t\u00edch \u1ea3nh b\u1eb1ng ph\u1ea7n m\u1ec1m ImageJ \u0111\u1ec3 d\u1ef1 \u0111o\u00e1n t\u1ed1c \u0111\u1ed9 s\u1ea5y. \u0110\u1ed9 r\u1ed7ng s\u1ee3i g\u1ed7 37,06 \u00b1 3,96%, \u0111\u1ed9 r\u1ed7ng l\u1ed7 m\u1ea1ch 16,03 \u00b1 1,23% v\u00e0 t\u1ed5ng \u0111\u1ed9 r\u1ed7ng 47,15% l\u00e0 m\u1ed9t \u0111\u1eb7c \u0111i\u1ec3m r\u1ea5t quan tr\u1ecdng \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn t\u1ed1c \u0111\u1ed9 s\u1ea5y c\u1ee7a g\u1ed7.<\/p>\n

T\u1eeb kh\u00f3a:<\/em><\/strong> C\u1ea5u t\u1ea1o hi\u1ec3n vi, \u0111\u1ed9 r\u1ed7ng, Keo tai t\u01b0\u1ee3ng, khuy\u1ebft t\u1eadt s\u1ea5y, t\u1ed1c \u0111\u1ed9 s\u1ea5y, v\u1eadn chuy\u1ec3n \u1ea9m<\/td>\n<\/tr>\n

\n

<\/a>Some wood anatomical features of Acacia mangium <\/em>Willd. affect the drying process<\/strong><\/p>\n

This study investigated the microscopic structure and porosity of 9-year-old Acacia mangium<\/em> Willd., harvested in Ngoc Thanh commune, Phuc Yen city, Vinh Phuc province, as a fundamental information for predicting the moisture movement and phenomena during drying. Descriptions were made by observing a combination of ESEM (environmental scanning electron microscope) scans and OM (optical microscope) images taken in cross, radial and tangential sections. The results showed that the vessel diffuse pattern and the pit membrane on the cells wall with no central torus, always presented openings, eliminating the difference between the permeability of the early and late wood and that of wood components in the radial direction. The vessels were arranged in a solitary pattern or in multiples in various formations (2-3 porous). This was an ideal condition for the moisture movement in the longitudinal direction. The diameter of the vessels in the tangential direction was 88 – 200 \u00b5m, with a quantity of 5 – 8 vessels\/mm\u00b2. The simple and low bordered perforation plate allows moisture to be transported in the longitudinal direction easily. The ratio of fibre lumen diameter over cell wall thickness was 4.09. This was the reason for the high collapse degrade of A. mangium<\/em> Willd. during drying. The structures of axial parenchyma cells and rays were identified. They did not too affect moisture movement, but they were used for explaining drying defects. The red-brown accumulations, which was seen in vessels and rays and the prismatic crystals, which was located in axial parenchyma cells obstruct the moisture flow. The calculation of the fibre and vessel porosity, which was done by the determination of the ratio of total pores area over image area using ImageJ software for the prediction of the drying rate. The fibre, vessel and total porosity was 37.06 \u00b1 3.96%, 16.03 \u00b1 1.23% and 47.15% respectively. This was a very important characteristic that affects the drying rate.<\/p>\n

Keywords:<\/em><\/strong> Anatomy, drying defect, drying rate, moisture movement, porosity<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

<\/a>EFFECT OF WOOD SPECIES ON UV WEATHERING RESISTANCE OF WOOD-PLASTIC COMPOSITES<\/p>\n

<\/a>Nguyen Van Dinh, Nguyen Van Giap, Nguyen Thanh Tung, Ta Thi Thanh Huong<\/p>\n

Research Institute Of Forest Industry<\/p>\n\n\n\n\n
The goal of this study was to evaluate accelerated weathering performance of high-density polyethylene (HDPE) -wood flour (WF) composites. The wood flour was obtained from three different plantation species including Eucalyptus urophylla<\/em>, Acacia mangium<\/em>, and Pinus caribaea<\/em>. The samples of WPC were exposed in a QUV accelerated weathering test for a total duration of 2000 h. The flexural strength, impact strength and surface color of the samples were tested. The weathered surface was characterized with Scanning electron microscopy (SEM) and Fourier transform infrared (FTIR) spectroscopy. The results indicate that: (1) the flexural strength and impact strength of the composites were decreased with increasing exposure time of weathering. The highest value of MOE, MOR and impact strength was seen in the Acacia mangium<\/em>\/HDPE composite; (2) The change of color and lightness of WPCs during weathering increased with increasing exposure time. The speed of change depends on wood species. WPC oxidation weather which is assessed by the concentration of carbonyl groups increased parallel with exposure duration. WPC filled with Acacia mangium<\/em> wood flour had higher \u2206E* and \u2206L* values after weathering compared to those of filled with Eucalyptus urophylla<\/em> and Pinus caribaea<\/em><\/p>\n

Keywords:<\/em><\/strong> Wood flour\/<\/strong>polyethylene, Eucalyptus urophylla<\/em>, Acacia mangium<\/em>, Pinus caribaea<\/em>, weathering, surface properties<\/td>\n<\/tr>\n

\n

\u1ea2nh h\u01b0\u1edfng c\u1ee7a lo\u00e0i g\u1ed7 \u0111\u1ebfn kh\u1ea3 n\u0103ng ch\u1ed1ng ch\u1ecbu th\u1eddi ti\u1ebft c\u1ee7a v\u1eadt li\u1ec7u g\u1ed7 nh\u1ef1a<\/strong><\/p>\n

M\u1ee5c ti\u00eau c\u1ee7a nghi\u00ean c\u1ee9u n\u00e0y l\u00e0 \u0111\u00e1nh gi\u00e1 kh\u1ea3 n\u0103ng ch\u1ed1ng ch\u1ecbu gia t\u1ed1c th\u1eddi ti\u1ebft c\u1ee7a v\u1eadt li\u1ec7u t\u1ed5ng h\u1ee3p nh\u1ef1a kh\u1ed1i l\u01b0\u1ee3ng th\u1ec3 t\u00edch cao (HDPE) v\u00e0 b\u1ed9t g\u1ed7 (WF). B\u1ed9t g\u1ed7 \u0111\u01b0\u1ee3c l\u1ea5y t\u1eeb ba lo\u00e0i g\u1ed7 r\u1eebng tr\u1ed3ng bao g\u1ed3m: B\u1ea1ch \u0111\u00e0n urophylla, Keo tai t\u01b0\u1ee3ng v\u00e0 Th\u00f4ng caribaea. C\u00e1c m\u1eabu th\u1eed \u0111\u01b0\u1ee3c ti\u1ebfn h\u00e0nh th\u1eed nghi\u1ec7m tr\u00ean m\u00e1y th\u1eed gia t\u1ed1c th\u1eddi ti\u1ebft QUV trong kho\u1ea3ng th\u1eddi gian l\u00e0 2.000 gi\u1edd. C\u00e1c ch\u1ec9 ti\u00eau \u0111\u00e1nh gi\u00e1 bao g\u1ed3m \u0111\u1ed9 b\u1ec1n u\u1ed1n, \u0111\u1ed9 b\u1ec1n va \u0111\u1eadp v\u00e0 \u0111\u1ed9 bi\u1ebfn m\u00e0u b\u1ec1 m\u1eb7t. \u0110\u1ed9 bi\u1ebfn m\u00e0u b\u1ec1 m\u1eb7t \u0111\u01b0\u1ee3c \u0111\u00e1nh gi\u00e1 b\u1eb1ng k\u00ednh hi\u1ec3n vi \u0111i\u1ec7n t\u1eed (SEM) v\u00e0 quang ph\u1ed5 h\u1ecdc h\u1ed3ng ngo\u1ea1i (FTIR). K\u1ebft qu\u1ea3 ch\u1ec9 ra: (1) \u0110\u1ed9 b\u1ec1n u\u1ed1n v\u00e0 \u0111\u1ed9 b\u1ec1n va \u0111\u1eadp c\u1ee7a v\u1eadt li\u1ec7u g\u1ed7 nh\u1ef1a gi\u1ea3m \u0111i khi th\u1eddi gian ti\u1ebfp x\u00fac th\u1eddi ti\u1ebft t\u0103ng l\u00ean. V\u1eadt li\u1ec7u g\u1ed7 nh\u1ef1a Keo tai t\u01b0\u1ee3ng v\u00e0 HDPE c\u00f3 gi\u00e1 tr\u1ecb MOE, MOR v\u00e0 c\u01b0\u1eddng \u0111\u1ed9 va \u0111\u1eadp l\u1edbn nh\u1ea5t, (2) S\u1ef1 thay \u0111\u1ed5i m\u00e0u s\u1eafc v\u00e0 \u0111\u1ed9 s\u00e1ng c\u1ee7a v\u1eadt li\u1ec7u g\u1ed7 nh\u1ef1a trong qu\u00e1 tr\u00ecnh ti\u1ebfp x\u00fac th\u1eddi ti\u1ebft t\u0103ng l\u00ean khi th\u1eddi gian ti\u1ebfp x\u00fac th\u1eddi ti\u1ebft t\u0103ng l\u00ean. T\u1ed1c \u0111\u1ed9 thay \u0111\u1ed5i ph\u1ee5 thu\u1ed9c v\u00e0o lo\u00e0i g\u1ed7. S\u1ef1 \u00f4xy h\u00f3a theo th\u1eddi ti\u1ebft c\u1ee7a v\u1eadt li\u1ec7u g\u1ed7 nh\u1ef1a \u0111\u01b0\u1ee3c \u0111\u00e1nh gi\u00e1 b\u1eb1ng m\u1ee9c \u0111\u1ed9 t\u0103ng nh\u00f3m carbonyl song song v\u1edbi th\u1eddi gian ti\u1ebfp x\u00fac th\u1eddi ti\u1ebft. V\u1eadt li\u1ec7u g\u1ed7 nh\u1ef1a v\u1edbi b\u1ed9t g\u1ed7 l\u00e0 g\u1ed7 Keo tai t\u01b0\u1ee3ng \u0111\u1ea1t \u0111\u01b0\u1ee3c gi\u00e1 tr\u1ecb \u2206E* v\u00e0 \u2206L* cao h\u01a1n sau khi ti\u1ebft x\u00fac th\u1eddi ti\u1ebft so v\u1edbi v\u1eadt li\u1ec7u g\u1ed7 nh\u1ef1a v\u1edb b\u1ed9t g\u1ed7 l\u00e0 g\u1ed7 B\u1ea1ch \u0111\u00e0n urophylla v\u00e0 g\u1ed7 Th\u00f4ng caribaea.<\/p>\n

T\u1eeb kh\u00f3a:<\/em><\/strong> B\u1ed9t g\u1ed7\/<\/strong>polyethylene, g\u1ed7 B\u1ea1ch \u0111\u00e0n urophylla, g\u1ed7 Keo tai t\u01b0\u1ee3ng, g\u1ed7 Th\u00f4ng caribaea; th\u1eddi ti\u1ebft, t\u00ednh ch\u1ea5t b\u1ec1 m\u1eb7t<\/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 2 – 2021 1. Nghi\u00ean c\u1ee9u \u0111\u1eb7c \u0111i\u1ec3m h\u00ecnh th\u00e1i, sinh l\u00fd h\u1ea1t gi\u1ed1ng v\u00e0 \u1ea3nh h\u01b0\u1edfng c\u1ee7a th\u00e0nh ph\u1ea7n ru\u1ed9t b\u1ea7u \u0111\u1ebfn sinh tr\u01b0\u1edfng \u00a0v\u00e0 ph\u00e1t tri\u1ec3n c\u1ee7a Sa nh\u00e2n t\u00edm (Amomum longiligulare T.L.Wu) t\u1ea1i huy\u1ec7n Ba V\u00ec, H\u00e0 N\u1ed9i Research on morphological characteristics, seed physiology and […]<\/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\/2215"}],"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=2215"}],"version-history":[{"count":3,"href":"https:\/\/vafs.gov.vn\/en\/wp-json\/wp\/v2\/posts\/2215\/revisions"}],"predecessor-version":[{"id":2392,"href":"https:\/\/vafs.gov.vn\/en\/wp-json\/wp\/v2\/posts\/2215\/revisions\/2392"}],"wp:attachment":[{"href":"https:\/\/vafs.gov.vn\/en\/wp-json\/wp\/v2\/media?parent=2215"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vafs.gov.vn\/en\/wp-json\/wp\/v2\/categories?post=2215"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vafs.gov.vn\/en\/wp-json\/wp\/v2\/tags?post=2215"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}