{"id":182,"date":"2009-03-24T03:19:55","date_gmt":"2005-04-08T02:37:11","guid":{"rendered":"http:\/\/vafs.dungnq.local\/2005\/04\/08\/ket-qua-nghien-cuu-moi-quan-he-giua-cac-loai-cay-trong-rung-tu-nhien\/"},"modified":"2019-09-25T09:53:34","modified_gmt":"2019-09-25T02:53:34","slug":"ket-qua-nghien-cuu-moi-quan-he-giua-cac-loai-cay-trong-rung-tu-nhien","status":"publish","type":"post","link":"https:\/\/vafs.gov.vn\/vn\/ket-qua-nghien-cuu-moi-quan-he-giua-cac-loai-cay-trong-rung-tu-nhien\/","title":{"rendered":"K\u1ebft qu\u1ea3 Nghi\u00ean c\u1ee9u m\u1ed1i quan h\u1ec7 gi\u1eefa c\u00e1c lo\u00e0i c\u00e2y trong r\u1eebng t\u1ef1 nhi\u00ean"},"content":{"rendered":"

Ho\u00e0ng V\u0103n Th\u1eafng<\/em><\/strong><\/p>\n

Vi\u1ec7n Khoa h\u1ecdc L\u00e2m nghi\u1ec7p Vi\u1ec7t Nam<\/em><\/h2>\n

R\u1eebng t\u1ef1 nhi\u00ean n\u01b0\u1edbc ta c\u00f3 t\u1ed5 th\u00e0nh lo\u00e0i c\u00e2y \u0111a d\u1ea1ng v\u00e0 phong ph\u00fa. Song m\u1ed7i m\u1ed9t lo\u00e0i c\u00e2y l\u1ea1i c\u00f3 m\u1ed9t v\u00f9ng ph\u00e2n b\u1ed1 nh\u1ea5t \u0111\u1ecbnh, s\u1ef1 ph\u00e2n b\u1ed1 n\u00e0y c\u00f3 li\u00ean quan ch\u1eb7t ch\u1ebd v\u1edbi \u0111i\u1ec1u ki\u1ec7n ho\u00e0n c\u1ea3nh c\u1ee7a m\u00f4i tr\u01b0\u1eddng xung quanh. Trong c\u00e1c h\u1ec7 sinh th\u00e1i r\u1eebng m\u01b0a nhi\u1ec7t \u0111\u1edbi, ngo\u00e0i c\u00e1c y\u1ebfu t\u1ed1 v\u1ec1 \u0111i\u1ec1u ki\u1ec7n c\u1ee7a m\u00f4i tr\u01b0\u1eddng, s\u1ef1 t\u1ed3n t\u1ea1i c\u1ee7a c\u00e1c lo\u00e0i trong c\u00f9ng m\u1ed9t l\u00e2m ph\u1ea7n c\u00f2n ph\u1ee5 thu\u1ed9c v\u00e0o m\u1ed1i quan h\u1ec7 qua l\u1ea1i gi\u1eefa c\u00e1c lo\u00e0i, ngh\u0129a l\u00e0 ngo\u00e0i s\u1ef1 c\u1ea1nh tranh v\u1ec1 \u0111i\u1ec1u ki\u1ec7n s\u1ed1ng, s\u1ef1 c\u00f9ng t\u1ed3n t\u1ea1i c\u1ee7a c\u00e1c lo\u00e0i c\u00f2n ch\u1ecbu \u1ea3nh h\u01b0\u1edfng tr\u1ef1c ti\u1ebfp hay gi\u00e1n ti\u1ebfp b\u1edfi c\u00e1c ch\u1ea5t ti\u1ebft c\u1ee7a c\u00e1c lo\u00e0i s\u1ed1ng c\u1ea1nh n\u00f3 (g\u1ecdi l\u00e0 phit\u00f4nxit) th\u00f4ng qua l\u00e1, hoa, r\u1ec5… Trong m\u1ed9t l\u00e2m ph\u1ea7n khi c\u00e1c lo\u00e0i c\u00f3 \u0111\u1ee7 kh\u00f4ng gian dinh d\u01b0\u1ee1ng nh\u01b0ng v\u00ec \u1ea3nh h\u01b0\u1edfng b\u1edfi phit\u00f4nxit c\u1ee7a c\u00e1c lo\u00e0i c\u00e2y xung quanh n\u00ean c\u00f3 th\u1ec3 di\u1ec5n ra theo hai chi\u1ec1u h\u01b0\u1edbng: ho\u1eb7c l\u00e0 c\u00f9ng t\u1ed3n t\u1ea1i ho\u1eb7c l\u00e0 b\u00e0i x\u00edch l\u1eabn nhau. Ch\u00fang c\u00f9ng t\u1ed3n t\u1ea1i khi phit\u00f4nxit c\u1ee7a c\u00e1c lo\u00e0i kh\u00f4ng c\u00f3 \u1ea3nh h\u01b0\u1edfng x\u1ea5u \u0111\u1ebfn nhau ho\u1eb7c k\u00edch th\u00edch s\u1ef1 sinh tr\u01b0\u1edfng ph\u00e1t tri\u1ec3n c\u1ee7a c\u00e1c lo\u00e0i xuang quanh, ng\u01b0\u1ee3c l\u1ea1i ch\u00fang s\u1ebd lo\u1ea1i tr\u1eeb nhau khi phit\u00f4nxit c\u1ee7a lo\u00e0i n\u00e0y c\u00f3 \u1ea3nh h\u01b0\u1edfng x\u1ea5u, k\u00ecm h\u00e3m s\u1ef1 ph\u00e1t tri\u1ec3n c\u1ee7a c\u00e1c lo\u00e0i b\u00ean c\u1ea1nh.<\/p>\n

V\u00ec th\u1ebf nghi\u00ean c\u1ee9u s\u00e2u v\u1ec1 m\u1ed1i quan h\u1ec7 qua l\u1ea1i gi\u1eefa c\u00e1c lo\u00e0i trong r\u1eebng t\u1ef1 nhi\u00ean l\u00e0 r\u1ea5t c\u1ea7n thi\u1ebft cho vi\u1ec7c \u0111i\u1ec1u ch\u1ec9nh t\u1ed5 th\u00e0nh lo\u00e0i c\u00e2y trong c\u00e1c l\u00e2m ph\u1ea7n r\u1eebng t\u1ef1 nhi\u00ean khi c\u1ea7n t\u00e1c \u0111\u1ed9ng c\u00e1c gi\u1ea3i ph\u00e1p l\u00e2m sinh v\u00e0 quan tr\u1ecdng h\u01a1n l\u00e0 l\u00e0m c\u01a1 s\u1edf cho vi\u1ec7c l\u1ef1a ch\u1ecdn v\u00e0 ph\u1ed1i h\u1ee3p c\u00e1c lo\u00e0i c\u00e2y trong tr\u1ed3ng r\u1eebng h\u1ed7n lo\u00e0i.<\/p>\n

I. M\u1ee5c ti\u00eau :<\/strong><\/p>\n

Nghi\u00ean c\u1ee9u m\u1ed1i quan h\u1ec7 gi\u1eefa c\u00e1c lo\u00e0i: v\u1ea1ng tr\u1ee9ng (Endospermum chinense<\/em>), s\u1ed3i ph\u1ea3ng (Lithocarpus fissus<\/em>), lim xanh (Erythrophloeum fordii<\/em>) v\u00e0 tr\u00e1m tr\u1eafng (Canarium album<\/em>) v\u1edbi c\u00e1c lo\u00e0i c\u00e2y kh\u00e1c trong r\u1eebng t\u1ef1 nhi\u00ean \u1edf c\u00e1c tr\u1ea1ng th\u00e1i r\u1eebng kh\u00e1c nhau, nh\u1eb1m l\u00e0m c\u01a1 s\u1edf cho vi\u1ec7c l\u1ef1a ch\u1ecdn v\u00e0 ph\u1ed1i h\u1ee3p c\u00e1c lo\u00e0i c\u00e2y khi x\u00e2y d\u1ef1ng m\u00f4 h\u00ecnh tr\u1ed3ng r\u1eebng h\u1ed7n lo\u00e0i.<\/p>\n

II. N\u1ed9i dung v\u00e0 ph\u01b0\u01a1ng ph\u00e1p :<\/strong><\/p>\n

X\u00e1c \u0111\u1ecbnh \u0111\u01b0\u1ee3c nh\u00f3m lo\u00e0i n\u00e0o hay g\u1eb7p v\u1edbi v\u1ea1ng tr\u1ee9ng, s\u1ed3i ph\u1ea3ng, tr\u00e1m tr\u1eafng v\u00e0 lim xanh trong r\u1eebng t\u1ef1 nhi\u00ean th\u1ee9 sinh \u0111\u00e3 v\u00e0 \u0111ang ph\u1ee5c h\u1ed3i. \u0110\u1ec3 nghi\u00ean c\u1ee9u m\u1ed1i quan h\u1ec7 gi\u1eefa c\u00e1c lo\u00e0i c\u00e2y c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng c\u00e1c ph\u01b0\u01a1ng ph\u00e1p kh\u00e1c nhau nh\u01b0: th\u00f4ng qua h\u1ec7 s\u1ed1 t\u01b0\u01a1ng quan rho\u1eb7c d\u00f9ng ph\u01b0\u01a1ng ph\u00e1p t\u1ea7n xu\u1ea5t xu\u1ea5t hi\u1ec7n. \u1edf\u0111\u00e2y v\u00ec lo\u00e0i c\u00e2y c\u1ea7n nghi\u00ean c\u1ee9u \u0111\u00e3 \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh tr\u01b0\u1edbc v\u00ec th\u1ebf ch\u00fang t\u00f4i s\u1eed d\u1ee5ng ph\u01b0\u01a1ng ph\u00e1p \u00f4 6 c\u00e2y. C\u1ee5 th\u1ec3 l\u1ea5y c\u00e2y c\u1ea7n nghi\u00ean c\u1ee9u l\u00e0m t\u00e2m \u00f4 sau \u0111\u00f3 x\u00e1c \u0111\u1ecbnh: kho\u1ea3ng c\u00e1ch, t\u00ean c\u00e2y, v\u00e0 \u0111o D1.3<\/sub> , <\/sup>Hvn v\u00e0 Dt c\u1ee7a 6 c\u00e2y g\u1ea7n nh\u1ea5t xung quanh n\u00f3. Sau \u0111\u00f3 t\u00ednh t\u1ea7n su\u1ea5t xu\u1ea5t hi\u1ec7n c\u1ee7a lo\u00e0i theo s\u1ed1 \u00f4 quan s\u00e1t (fo) v\u00e0 theo s\u1ed1 c\u00e2y (fc). C\u0103n c\u1ee9 v\u00e0o gi\u00e1 tr\u1ecb c\u1ee7a fo v\u00e0 fc v\u1edbi m\u1ee9c \u00fd ngh\u0129a a= 0.05 chia c\u00e1c lo\u00e0i c\u00e2y c\u00f9ng xu\u1ea5t hi\u1ec7n v\u1edbi c\u00e1c lo\u00e0i nghi\u00ean c\u1ee9u theo c\u00e1c nh\u00f3m sau:<\/p>\n

– Nh\u00f3m 1: r\u1ea5t hay g\u1eb7p , g\u1ed3m nh\u1eefng lo\u00e0i c\u00f3 f0 <\/sub>\u00b330% v\u00e0 fc \u00b37%<\/p>\n

– Nh\u00f3m 2: hay g\u1eb7p, g\u1ed3m nh\u1eefng lo\u00e0i c\u00f3 15% \u00a3fo < 30% v\u00e0 3% \u00a3fc <7%.<\/p>\n

– Nh\u00f3m 3: \u00edt g\u1eb7p, g\u1ed3m nh\u1eefng lo\u00e0i c\u00f3 fo <15% v\u00e0 fc <3%<\/p>\n

III. K\u1ebft qu\u1ea3:<\/strong><\/p>\n

K\u1ebft qu\u1ea3 \u0111i\u1ec1u tra 39 \u00f4 v\u1ea1ng tr\u1ee9ng v\u1edbi 234 c\u00e1 th\u1ec3 \u0111\u00e3 x\u00e1c \u0111\u1ecbnh \u0111\u01b0\u1ee3c c\u00f3 44 lo\u00e0i c\u00e2y b\u1ea1n xu\u1ea5t hi\u1ec7n c\u00f9ng v\u1ea1ng tr\u1ee9ng, 38 \u00f4 s\u1ed3i ph\u1ea3ng v\u1edbi 228 c\u00e1 th\u1ec3 th\u1ea5y c\u00f3 36 lo\u00e0i c\u00e2y b\u1ea1n, 30 \u00f4 lim xanh v\u1edbi 180 c\u00e1 th\u1ec3 c\u00f3 38 lo\u00e0i c\u00e2y b\u1ea1n v\u00e0 21 \u00f4 tr\u00e1m tr\u1eafng v\u1edbi 126 c\u00e1 th\u1ec3 c\u00f3 34 lo\u00e0i c\u00e2y b\u1ea1n c\u00f9ng xu\u1ea5t hi\u1ec7n, k\u1ebft qu\u1ea3 cho \u1edf b\u1ea3ng 1.<\/p>\n

B\u1ea3ng 1: S\u1ed1 \u00f4 quan s\u00e1t v\u00e0 s\u1ed1 lo\u00e0i c\u00e2y b\u1ea1n c\u1ee7a c\u00e1c lo\u00e0i c\u00e2y nghi\u00ean c\u1ee9u<\/em><\/strong><\/p>\n\n\n\n\n\n\n
Lo\u00e0i c\u00e2y nghi\u00ean c\u1ee9u<\/strong><\/td>\nV\u1ea1ng tr\u1ee9ng<\/strong><\/td>\nS\u1ed3i ph\u1ea3ng<\/strong><\/td>\nLim xanh<\/strong><\/td>\nTr\u00e1m tr\u1eafng<\/strong><\/td>\n<\/tr>\n
S\u1ed1 \u00f4 quan s\u00e1t<\/td>\n39<\/td>\n38<\/td>\n30<\/td>\n21<\/td>\n<\/tr>\n
S\u1ed1 \u00f4 c\u00f3 lo\u00e0i c\u00e2y b\u1ea1n l\u00e0 ch\u00ednh n\u00f3<\/td>\n15<\/p>\n

(38,5%)<\/td>\n

28<\/p>\n

(73,7%)<\/td>\n

10<\/p>\n

(33,3%)<\/td>\n

2<\/p>\n

(9.5%)<\/td>\n<\/tr>\n

S\u1ed1 lo\u00e0i c\u00e2y b\u1ea1n xu\u1ea5t hi\u1ec7n c\u00f9ng lo\u00e0i c\u00e2y nghi\u00ean c\u1ee9u<\/td>\n44<\/td>\n36<\/td>\n38<\/td>\n34<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

M\u1eb7c d\u00f9 s\u1ed1 \u00f4 quan s\u00e1t c\u1ee7a c\u00e1c lo\u00e0i nghi\u00ean c\u1ee9u ch\u01b0a nhi\u1ec1u nh\u01b0ng k\u1ebft qu\u1ea3 cho th\u1ea5y s\u1ed1 lo\u00e0i c\u00e2y b\u1ea1n c\u1ee7a c\u00e1c lo\u00e0i \u0111\u00f3 xu\u1ea5t hi\u1ec7n t\u01b0\u01a1ng \u0111\u1ed1i l\u1edbn, song c\u00e1c lo\u00e0i n\u00e0y xu\u1ea5t hi\u1ec7n v\u1edbi t\u1ea7n xu\u1ea5t r\u1ea5t kh\u00e1c nhau. Vi\u1ec7c x\u1ebfp nh\u00f3m c\u00e1c lo\u00e0i c\u00e2y b\u1ea1n theo c\u00e1c m\u1ee9c \u0111\u1ed9 kh\u00e1c nhau d\u1ef1a v\u00e0o \u0111i\u1ec3m \u0111i\u1ec1u tra hay s\u1ed1 c\u00e1 th\u1ec3 s\u1ebd cho k\u1ebft qu\u1ea3 kh\u00e1c nhau. \u0110\u1ed1i v\u1edbi nh\u1eefng lo\u00e0i c\u00f3 t\u00ednh qu\u1ea7n th\u1ec3 r\u00f5 r\u1ec7t th\u00ec t\u1ea1i m\u1ed9t \u0111i\u1ec3m \u0111i\u1ec1u tra c\u00f3 th\u1ec3 g\u1eb7p nhi\u1ec1u c\u00e1 th\u1ec3 c\u00f9ng lo\u00e0i do \u0111\u00f3 khi t\u00ednh theo s\u1ed1 c\u00e1 th\u1ec3 th\u00ec s\u1ebd chi\u1ebfm t\u1ef7 l\u1ec7 ph\u1ea7n tr\u0103m cao h\u01a1n so v\u1edbi khi t\u00ednh theo \u0111i\u1ec3m \u0111i\u1ec1u tra. Theo gi\u00e1 tr\u1ecb c\u1ee7a fo v\u00e0 fc t\u00ednh \u0111\u01b0\u1ee3c cho th\u1ea5y c\u00e1c lo\u00e0i r\u1ea5t hay g\u1eb7p v\u00e0 hay g\u1eb7p v\u1edbi c\u00e1c lo\u00e0i nghi\u00ean c\u1ee9u \u0111\u01b0\u1ee3c th\u1ec3 hi\u1ec7n \u1edf b\u1ea3ng 2.<\/p>\n

T\u1eeb b\u1ea3ng 2 cho th\u1ea5y v\u1ea1ng l\u00e0 lo\u00e0i xu\u1ea5t hi\u1ec7n c\u1ea1nh n\u00f3 nhi\u1ec1u nh\u1ea5t v\u1edbi t\u1ea7n su\u1ea5t 38.5% theo \u0111i\u1ec3m \u0111i\u1ec1u tra v\u00e0 10.3% theo s\u1ed1 c\u00e1 th\u1ec3. \u0110i\u1ec1u n\u00e0y ch\u1ee9ng t\u1ecf v\u1ea1ng l\u00e0 lo\u00e0i c\u00f3 t\u00ednh qu\u1ea7n th\u1ec3 r\u1ea5t cao. B\u1ea3ng 2 c\u0169ng cho th\u1ea5y s\u1ed3i ph\u1ea3ng xu\u1ea5t hi\u1ec7n nh\u01b0 l\u00e0 c\u00e2y b\u1ea1n c\u1ee7a ch\u00ednh n\u00f3 v\u1edbi t\u1ea7n su\u1ea5t l\u1edbn nh\u1ea5t 73.7% theo \u0111i\u1ec3m \u0111i\u1ec1u tra v\u00e0 27.6% theo s\u1ed1 c\u00e1 th\u1ec3 ngh\u0129a l\u00e0 s\u1ed3i ph\u1ea3ng c\u0169ng c\u00f3 t\u00ednh qu\u1ea7n th\u1ec3 r\u1ea5t r\u00f5 r\u1ec7t. \u0110\u1ed1i v\u1edbi lim xanh k\u1ebft qu\u1ea3 b\u1ea3ng 2 cho th\u1ea5y r\u00e0ng r\u00e0ng l\u00e0 lo\u00e0i xu\u1ea5t hi\u1ec7n nhi\u1ec1u nh\u1ea5t chi\u1ebfm 63.3% theo \u0111i\u1ec3m \u0111i\u1ec1u tra v\u00e0 23.9% theo s\u1ed1 c\u00e1 th\u1ec3, lim xanh xu\u1ea5t hi\u1ec7n nh\u01b0 l\u00e0 c\u00e2y b\u1ea1n c\u1ee7a ch\u00ednh n\u00f3 tuy kh\u00f4ng ph\u1ea3i nhi\u1ec1u nh\u1ea5t nh\u01b0ng n\u00f3 c\u0169ng chi\u1ebfm m\u1ed9t t\u1ef7 l\u1ec7 l\u1edbn trong nh\u00f3m lo\u00e0i r\u1ea5t hay g\u1eb7p v\u1edbi ch\u00ednh n\u00f3 (33.3% theo \u0111i\u1ec3m \u0111i\u1ec1u tra v\u00e0 7.8% theo s\u1ed1 c\u00e1 th\u1ec3 ). \u0110i\u1ec1u n\u00e0y c\u0169ng th\u1ec3 hi\u1ec7n t\u00ednh qu\u1ea7n th\u1ec3 t\u01b0\u01a1ng \u0111\u1ed1i r\u00f5 r\u1ec7t c\u1ee7a lim xanh. Trong 4 lo\u00e0i c\u00e2y nghi\u00ean c\u1ee9u th\u00ec tr\u00e1m tr\u1eafng th\u1ec3 hi\u1ec7n t\u00ednh qu\u1ea7n th\u1ec3 th\u1ea5p nh\u1ea5t, n\u00f3 c\u0169ng ph\u00f9 h\u1ee3p v\u1edbi \u0111\u1eb7c t\u00ednh m\u1ecdc r\u1ea3i r\u00e1c trong r\u1eebng t\u1ef1 nhi\u00ean c\u1ee7a lo\u00e0i.<\/p>\n

B\u1ea3ng 2: M\u1ee9c \u0111\u1ed9 xu\u1ea5t hi\u1ec7n c\u1ee7a nh\u00f3m lo\u00e0i c\u00e2y b\u1ea1n v\u1edbi c\u00e1c lo\u00e0i c\u00e2y nghi\u00ean c\u1ee9u<\/em><\/strong><\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Lo\u00e0i c\u00e2y nghi\u00ean c\u1ee9u<\/strong><\/td>\nLo\u00e0i c\u00e2y b\u1ea1n<\/strong><\/td>\nfo<\/strong><\/td>\nfc <\/strong><\/td>\nM\u1ee9c \u0111\u1ed9 xu\u1ea5t hi\u1ec7n<\/strong><\/td>\n<\/tr>\n
V\u1ea1ng tr\u1ee9ng<\/td>\nv\u1ea1ng<\/em><\/strong><\/td>\n38.5<\/em><\/strong><\/td>\n10.3<\/em><\/strong><\/td>\nNh\u00f3m lo\u00e0i r\u1ea5t hay g\u1eb7p<\/em><\/strong><\/td>\n<\/tr>\n
gi\u1ebb<\/em><\/strong><\/td>\n35.9<\/em><\/strong><\/td>\n9.4<\/em><\/strong><\/td>\n<\/tr>\n
r\u00e0ng r\u00e0ng<\/td>\n25.6<\/td>\n7.3<\/td>\nNh\u00f3m lo\u00e0i hay g\u1eb7p<\/td>\n<\/tr>\n
tr\u00e1m<\/td>\n25.6<\/td>\n5.1<\/td>\n<\/tr>\n
s\u1ed3i ph\u1ea3ng<\/td>\n20.5<\/td>\n6.8<\/td>\n<\/tr>\n
ng\u00e1t<\/td>\n17.9<\/td>\n6.8<\/td>\n<\/tr>\n
sp<\/td>\n17.9<\/td>\n5.1<\/td>\n<\/tr>\n
re g\u1eebng<\/td>\n17.9<\/td>\n4.7<\/td>\n<\/tr>\n
tr\u00e2m<\/td>\n17.9<\/td>\n3.8<\/td>\n<\/tr>\n
nang<\/td>\n15.4<\/td>\n3.8<\/td>\n<\/tr>\n
xoan \u0111\u00e0o<\/td>\n15.4<\/td>\n3.8<\/td>\n<\/tr>\n
S\u1ed3i ph\u1ea3ng<\/td>\ns\u1ed3i ph\u1ea3ng<\/em><\/strong><\/td>\n73.7<\/em><\/strong><\/td>\n27.6<\/em><\/strong><\/td>\nNh\u00f3m lo\u00e0i r\u1ea5t hay g\u1eb7p<\/em><\/strong><\/td>\n<\/tr>\n
t\u00e1u<\/em><\/strong><\/td>\n44.7<\/em><\/strong><\/td>\n11.8<\/em><\/strong><\/td>\n<\/tr>\n
tr\u00e2m<\/em><\/strong><\/td>\n36.8<\/em><\/strong><\/td>\n7.0<\/em><\/strong><\/td>\n<\/tr>\n
r\u00e0ng r\u00e0ng<\/td>\n31.6<\/td>\n6.6<\/td>\nNh\u00f3m lo\u00e0i hay g\u1eb7p<\/td>\n<\/tr>\n
nh\u1ecdc<\/td>\n23.7<\/td>\n5.7<\/td>\n<\/tr>\n
tr\u00e1m<\/td>\n23.7<\/td>\n4.4<\/td>\n<\/tr>\n
gi\u1ebb<\/td>\n21.1<\/td>\n3.1<\/td>\n<\/tr>\n
\u0111\u00e1i b\u00f2<\/td>\n18.4<\/td>\n3.1<\/td>\n<\/tr>\n
ch\u1eb9o<\/td>\n18.4<\/td>\n3.1<\/td>\n<\/tr>\n
Lim xanh<\/td>\nr\u00e0ng r\u00e0ng<\/em><\/strong><\/td>\n63.3<\/em><\/strong><\/td>\n23.9<\/em><\/strong><\/td>\nNh\u00f3m lo\u00e0i r\u1ea5t hay g\u1eb7p<\/em><\/strong><\/td>\n<\/tr>\n
gi\u1ebb<\/em><\/strong><\/td>\n43.3<\/em><\/strong><\/td>\n10.0<\/em><\/strong><\/td>\n<\/tr>\n
lim xanh<\/em><\/strong><\/td>\n33.3<\/em><\/strong><\/td>\n7.8<\/em><\/strong><\/td>\n<\/tr>\n
xoan \u0111\u00e0o<\/td>\n33.3<\/td>\n5.6<\/td>\nNh\u00f3m lo\u00e0i hay g\u1eb7p<\/td>\n<\/tr>\n
tr\u00e1m<\/td>\n23.3<\/td>\n4.4<\/td>\n<\/tr>\n
kh\u00e1o<\/td>\n23.3<\/td>\n3.9<\/td>\n<\/tr>\n
s\u1ed3i gai<\/td>\n20.0<\/td>\n5.6<\/td>\n<\/tr>\n
ch\u1eb9o<\/td>\n20.0<\/td>\n3.9<\/td>\n<\/tr>\n
t\u00e1u<\/td>\n13.3<\/td>\n3.3<\/td>\n<\/tr>\n
Tr\u00e1m tr\u1eafng<\/td>\ngi\u1ebb<\/em><\/strong><\/td>\n47.6<\/em><\/strong><\/td>\n10.3<\/em><\/strong><\/td>\nNh\u00f3m lo\u00e0i r\u1ea5t <\/em><\/strong><\/p>\n

hay g\u1eb7p<\/em><\/strong><\/td>\n<\/tr>\n

r\u00e0ng r\u00e0ng<\/em><\/strong><\/td>\n42.9<\/em><\/strong><\/td>\n12.7<\/em><\/strong><\/td>\n<\/tr>\n
lim xanh<\/em><\/strong><\/td>\n38.1<\/em><\/strong><\/td>\n8.7<\/em><\/strong><\/td>\n<\/tr>\n
s\u1ed3i ph\u1ea3ng<\/td>\n33.3<\/td>\n6.3<\/td>\nNh\u00f3m lo\u00e0i hay g\u1eb7p<\/td>\n<\/tr>\n
ng\u00e1t<\/td>\n28.6<\/td>\n4.8<\/td>\n<\/tr>\n
t\u00e1u<\/td>\n23.8<\/td>\n5.6<\/td>\n<\/tr>\n
tr\u00e1m<\/td>\n23.8<\/td>\n4.8<\/td>\n<\/tr>\n
ch\u1eb9o<\/td>\n23.8<\/td>\n4.8<\/td>\n<\/tr>\n
re<\/td>\n23.8<\/td>\n4.0<\/td>\n<\/tr>\n
kh\u00e1o<\/td>\n19.0<\/td>\n3.2<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Tuy nhi\u00ean, ph\u00e2n b\u1ed1 tr\u00ean m\u1eb7t \u0111\u1ea5t c\u1ee7a nh\u00f3m lo\u00e0i c\u00e2y b\u1ea1n v\u1edbi c\u00e1c lo\u00e0i nghi\u00ean c\u1ee9u c\u0169ng r\u1ea5t kh\u00e1c nhau, dao \u0111\u1ed9ng nhi\u1ec1u nh\u1ea5t l\u00e0 \u1edf lim xanh. \u1edfm\u1ed9t v\u00e0i \u0111i\u1ec3m \u0111i\u1ec1u tra cho th\u1ea5y c\u00f3 lo\u00e0i ch\u1ec9 c\u00e1ch lim xanh 0.1m nh\u01b0ng c\u0169ng c\u00f3 lo\u00e0i c\u00e1ch n\u00f3 t\u1edbi 8.8m. \u0110\u1ed1i v\u1edbi s\u1ed3i ph\u1ea3ng, v\u1ea1ng tr\u1ee9ng v\u00e0 tr\u00e1m tr\u1eafng th\u00ec ph\u00e2n b\u1ed1 tr\u00ean m\u1eb7t \u0111\u1ea5t c\u1ee7a c\u00e1c lo\u00e0i c\u00e2y b\u1ea1n v\u1edbi ch\u00fang t\u01b0\u01a1ng \u0111\u1ed1i \u0111\u1ec1u, b\u00ecnh qu\u00e2n kho\u1ea3ng 4.3m. C\u0103n c\u1ee9 v\u00e0o \u0111\u01b0\u1eddng k\u00ednh t\u00e1n v\u00e0 kho\u1ea3ng c\u00e1ch t\u1eeb c\u00e1c lo\u00e0i c\u00e2y nghi\u00ean c\u1ee9u t\u1edbi c\u00e1c lo\u00e0i c\u00e2y b\u1ea1n cho th\u1ea5y ph\u1ea7n l\u1edbn ch\u00fang \u0111ang c\u00f3 s\u1ef1 c\u1ea1nh tranh nhau v\u1ec1 kh\u00f4ng gian dinh d\u01b0\u1ee1ng \u0111i\u1ec1u n\u00e0y \u0111\u01b0\u1ee3c th\u1ec3 hi\u1ec7n \u1edf b\u1ea3ng 3:<\/p>\n

B\u1ea3ng 3: C\u00e1c gi\u00e1 tr\u1ecb b\u00ecnh qu\u00e2n c\u1ee7a c\u00e1c lo\u00e0i nghi\u00ean c\u1ee9u v\u00e0 nh\u00f3m c\u00e2y b\u1ea1n.<\/em><\/strong><\/p>\n\n\n\n\n\n\n\n
Lo\u00e0i c\u00e2y<\/strong><\/p>\n

Ch\u1ec9 ti\u00eau<\/strong><\/td>\n

V\u1ea1ng<\/strong><\/td>\nC\u00e2y b\u1ea1n<\/strong><\/td>\nS\u1ed3i ph\u1ea3ng<\/strong><\/td>\nC\u00e2y b\u1ea1n<\/strong><\/td>\nLim xanh<\/strong><\/td>\nC\u00e2y b\u1ea1n<\/strong><\/td>\nTr\u00e1m tr\u1eafng<\/strong><\/td>\nC\u00e2y b\u1ea1n<\/strong><\/td>\n<\/tr>\n
D1.3<\/sub> (cm)<\/td>\n13.4<\/td>\n14.5<\/td>\n17.2<\/td>\n12.5<\/td>\n23.3<\/td>\n14.6<\/td>\n21.3<\/td>\n16.6<\/td>\n<\/tr>\n
Hvn (m)<\/td>\n12.6<\/td>\n13.1<\/td>\n17<\/td>\n13.7<\/td>\n13.9<\/td>\n13.7<\/td>\n14.4<\/td>\n14.2<\/td>\n<\/tr>\n
Dt (m)<\/td>\n5.7<\/td>\n5.3<\/td>\n7.5<\/td>\n4.1<\/td>\n7.7<\/td>\n5.3<\/td>\n4.8<\/td>\n6.0<\/td>\n<\/tr>\n
Kho\u1ea3ng c\u00e1ch TB t\u1eeb c\u00e2y n\/c \u0111\u1ebfn c\u00e2y b\u1ea1n (m). (min – max)<\/td>\n4.3<\/p>\n

(1.8 – 6.9)<\/td>\n

4.5<\/p>\n

(1.3 – 6.4)<\/td>\n

4.3<\/p>\n

(0.1 – 8.8)<\/td>\n

4.2<\/p>\n

(1 – 8)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

K\u1ebft qu\u1ea3 b\u1ea3ng 3 cho th\u1ea5y nh\u00ecn chung c\u00e1c lo\u00e0i c\u00e2y nghi\u00ean c\u1ee9u c\u00f3 c\u00e1c ch\u1ec9 ti\u00eau D1.3<\/sub> v\u00e0 Hvn l\u1edbn h\u01a1n c\u00e1c lo\u00e0i c\u00e2y b\u1ea1n (tr\u1eeb v\u1ea1ng tr\u1ee9ng). \u0110i\u1ec1u \u0111\u00f3 ch\u1ee9ng t\u1ecf c\u00e1c lo\u00e0i nghi\u00ean c\u1ee9u \u0111\u1ec1u \u1edf t\u1ea7ng tr\u1ed9i c\u1ee7a r\u1eebng. Gi\u00e1 tr\u1ecb c\u1ee7a D 1.3<\/sub> v\u00e0 H vn<\/sub> c\u1ee7a c\u1ea3 lo\u00e0i nghi\u00ean c\u1ee9u v\u00e0 c\u00e2y b\u1ea1n cho bi\u1ebft ch\u00fang \u0111ang \u1edf giai \u0111o\u1ea1n r\u1eebng trung ni\u00ean n\u00ean m\u1ed7i lo\u00e0i c\u00e2y \u0111\u1ec1u \u0111\u00e3 c\u00f3 m\u1ed9t kh\u00f4ng gian s\u1ed1ng t\u01b0\u01a1ng \u0111\u1ed1i \u1ed5n \u0111\u1ecbnh. V\u00ec th\u1ebf m\u1ed1i quan h\u1ec7 gi\u1eefa c\u00e1c lo\u00e0i l\u00fac n\u00e0y ngo\u00e0i s\u1ef1 c\u1ea1nh tranh v\u1ec1 kh\u00f4ng gian dinh d\u01b0\u1ee1ng ch\u00fang c\u00f2n ch\u1ecbu \u1ea3nh h\u01b0\u1edfng b\u1edfi phit\u00f4nxit c\u1ee7a m\u1ed7i lo\u00e0i xung quanh. Gi\u00e1 tr\u1ecb b\u00ecnh qu\u00e2n kho\u1ea3ng c\u00e1ch t\u1eeb lo\u00e0i c\u00e2y nghi\u00ean c\u1ee9u \u0111\u1ebfn c\u00e1c lo\u00e0i c\u00e2y b\u1ea1n xung quanh cho th\u1ea5y khi nghi\u00ean c\u1ee9u m\u1ed1i quan h\u1ec7 gi\u1eefa c\u00e1c lo\u00e0i c\u00e2y r\u1eebng t\u1ef1 nhi\u00ean m\u00e0 c\u00e1c lo\u00e0i c\u00e2y nghi\u00ean c\u1ee9u \u0111\u01b0\u1ee3c ch\u1ecdn ng\u1eabu nhi\u00ean th\u00ec thay cho ph\u01b0\u01a1ng ph\u00e1p \u00f4 6 c\u00e2y c\u00f3 th\u1ec3 \u0111i\u1ec1u tra c\u00e1c \u00f4 h\u00ecnh tr\u00f2n v\u1edbi b\u00e1n k\u00ednh l\u00e0 R= 4.3m. V\u00ec khi \u0111i\u1ec1u tra m\u1ed1i quan h\u1ec7 theo ph\u01b0\u01a1ng ph\u00e1p l\u1eadp \u00f4 th\u00ec vi\u1ec7c x\u00e1c \u0111\u1ecbnh di\u1ec7n t\u00edch \u00f4 r\u1ea5t quan tr\u1ecdng. N\u1ebfu di\u1ec7n t\u00edch \u00f4 qu\u00e1 l\u1edbn s\u1ebd c\u00f3 nhi\u1ec1u lo\u00e0i c\u00f9ng xu\u1ea5t hi\u1ec7n cho d\u00f9 ch\u00fang kh\u00f4ng c\u00f3 quan h\u1ec7 v\u1edbi nhau, ng\u01b0\u1ee3c l\u1ea1i khi di\u1ec7n t\u00edch \u00f4 qu\u00e1 nh\u1ecf l\u1ea1i b\u1ecf qua nhi\u1ec1u lo\u00e0i m\u1eb7c d\u00f9 ch\u00fang c\u00f3 quan h\u1ec7.<\/p>\n

IV. K\u1ebft lu\u1eadn:<\/strong><\/p>\n

Nghi\u00ean c\u1ee9u x\u00e1c \u0111\u1ecbnh m\u1ed1i quan h\u1ec7 gi\u1eefa c\u00e1c lo\u00e0i trong r\u1eebng t\u1ef1 nhi\u00ean l\u00e0 v\u1ea5n \u0111\u1ec1 ph\u1ee9c t\u1ea1p. \u0110\u1ec3 c\u00f3 nh\u1eefng c\u01a1 s\u1edf khoa h\u1ecdc ch\u1eafc ch\u1eafn c\u1ea7n ph\u1ea3i c\u0103n c\u1ee9 v\u00e0o \u0111\u1eb7c \u0111i\u1ec3m sinh v\u1eadt h\u1ecdc v\u00e0 \u0111i s\u00e2u nghi\u00ean c\u1ee9u v\u1ec1 phit\u00f4nxit c\u1ee7a t\u1eebng lo\u00e0i. Trong khi ch\u01b0a c\u00f3 \u0111i\u1ec1u ki\u1ec7n nghi\u00ean c\u1ee9u m\u1ed1i quan h\u1ec7 qua l\u1ea1i gi\u1eefa c\u00e1c lo\u00e0i c\u00e2y trong r\u1eebng t\u1ef1 nhi\u00ean b\u1eb1ng ph\u01b0\u01a1ng ph\u00e1p \u0111\u00f3 th\u00ec vi\u1ec7c nghi\u00ean c\u1ee9u m\u1ed1i quan h\u1ec7 gi\u1eefa c\u00e1c lo\u00e0i: v\u1ea1ng tr\u1ee9ng, s\u1ed3i ph\u1ea3ng, lim xanh v\u00e0 tr\u00e1m tr\u1eafng v\u1edbi c\u00e1c lo\u00e0i c\u00e2y kh\u00e1c trong r\u1eebng t\u1ef1 nhi\u00ean b\u1eb1ng ph\u01b0\u01a1ng ph\u00e1p t\u1ea7n xu\u1ea5t xu\u1ea5t hi\u1ec7n cho ta m\u1ed9t s\u1ed1 k\u1ebft qu\u1ea3 ban \u0111\u1ea7u r\u1ea5t quan tr\u1ecdng l\u00e0m c\u01a1 s\u1edf cho vi\u1ec7c ch\u1ecdn v\u00e0 ph\u1ed1i h\u1ee3p nh\u00f3m lo\u00e0i c\u00e2y khi x\u00e2y d\u1ef1ng m\u00f4 h\u00ecnh tr\u1ed3ng r\u1eebng h\u1ed7n lo\u00e0i. T\u1eeb k\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u, c\u00f3 th\u1ec3 r\u00fat ra m\u1ed9t s\u1ed1 k\u1ebft lu\u1eadn sau:<\/p>\n

\u00b7 S\u1ed1 lo\u00e0i c\u00e2y b\u1ea1n xu\u1ea5t hi\u1ec7n c\u00f9ng c\u00e1c lo\u00e0i c\u00e2y nghi\u00ean c\u1ee9u \u0111\u1ec1u r\u1ea5t l\u1edbn. Th\u1ea5p nh\u1ea5t l\u00e0 34 lo\u00e0i (c\u1ee7a 21 \u00f4 tr\u00e1m tr\u1eafng) v\u00e0 cao nh\u1ea5t l\u00e0 44 lo\u00e0i (c\u1ee7a 39 \u00f4 v\u1ea1ng tr\u1ee9ng).<\/p>\n

\u00b7 V\u1ea1ng tr\u1ee9ng v\u00e0 gi\u1ebb l\u00e0 hai lo\u00e0i th\u01b0\u1eddng g\u1eb7p nhi\u1ec1u nh\u1ea5t v\u1edbi v\u1ea1ng tr\u1ee9ng. Nh\u00f3m lo\u00e0i xu\u1ea5t hi\u1ec7n nhi\u1ec1u nh\u1ea5t c\u00f9ng s\u1ed3i ph\u1ea3ng l\u00e0 s\u1ed3i ph\u1ea3ng, t\u00e1u v\u00e0 tr\u00e2m. Xu\u1ea5t hi\u1ec7n nhi\u1ec1u nh\u1ea5t v\u1edbi lim xanh g\u1ed3m r\u00e0ng r\u00e0ng, gi\u1ebb v\u00e0 lim xanh. C\u00e1c lo\u00e0i gi\u1ebb, r\u00e0ng r\u00e0ng v\u00e0 lim xanh l\u00e0 nh\u00f3m lo\u00e0i xu\u1ea5t hi\u1ec7n c\u00f9ng tr\u00e1m tr\u1eafng v\u1edbi t\u1ea7n su\u1ea5t l\u1edbn nh\u1ea5t.<\/p>\n

\u00b7 C\u1ea3 3 lo\u00e0i: v\u1ea1ng tr\u1ee9ng, s\u1ed3i ph\u1ea3ng v\u00e0 lim xanh \u0111\u1ec1u xu\u1ea5t hi\u1ec7n c\u00f9ng v\u1edbi ch\u00ednh n\u00f3 v\u1edbi t\u1ea7n xu\u1ea5t cao, ngh\u0129a l\u00e0 ch\u00fang \u0111\u1ec1u c\u00f3 t\u00ednh qu\u1ea7n th\u1ec3 r\u1ea5t r\u00f5 r\u1ec7t. Ri\u00eang tr\u00e1m tr\u1eafng th\u00ec \u0111\u1eb7c t\u00ednh n\u00e0y th\u1ec3 hi\u1ec7n k\u00e9m h\u01a1n.<\/p>\n

Tr\u00ean \u0111\u00e2y ch\u1ec9 l\u00e0 nh\u1eefng k\u1ebft qu\u1ea3 ban \u0111\u1ea7u. \u0110\u1ed1i v\u1edbi r\u1eebng t\u1ef1 nhi\u00ean th\u1ee9 sinh \u0111\u00e3 ph\u1ee5c h\u1ed3i th\u00ec c\u00e1c m\u1ed1i quan h\u1ec7 tr\u00ean l\u00e0 t\u01b0\u01a1ng \u0111\u1ed1i \u1ed5n \u0111\u1ecbnh, c\u00f2n \u0111\u1ed1i v\u1edbi r\u1eebng t\u1ef1 nhi\u00ean th\u1ee9 sinh \u0111ang trong giai \u0111o\u1ea1n ph\u1ee5c h\u1ed3i th\u00ec s\u1ed1 lo\u00e0i c\u00e2y b\u1ea1n v\u00e0 m\u1ee9c \u0111\u1ed9 xu\u1ea5t hi\u1ec7n c\u1ee7a ch\u00fang c\u00f3 th\u1ec3 s\u1ebd thay \u0111\u1ed5i tu\u1ef3 theo c\u00e1c giai \u0111o\u1ea1n ph\u00e1t tri\u1ec3n c\u1ee7a r\u1eebng. V\u00ec th\u1ebf, c\u1ea7n nghi\u00ean c\u1ee9u th\u00eam \u0111\u1ec3 c\u00f3 k\u1ebft qu\u1ea3 s\u00e1t th\u1ef1c h\u01a1n.<\/p>\n

T\u00e0i li\u1ec7u tham kh\u1ea3o<\/h1>\n

1. Tr\u01b0\u1eddng \u0110\u1ea1i H\u1ecdc L\u00e2m Nghi\u1ec7p – K\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u khoa h\u1ecdc 1990-1994. Nh\u00e0 xu\u1ea5t b\u1ea3n N\u00f4ng Nghi\u1ec7p.<\/p>\n

2. Nguy\u1ec5n H\u1ea3i Tu\u1ea5t – Th\u1eed nghi\u1ec7m m\u1ed9t ph\u01b0\u01a1ng ph\u00e1p nghi\u00ean c\u1ee9u m\u1ed1i quan h\u1ec7 gi\u1eefa c\u00e1c lo\u00e0i c\u00e2y trong r\u1eebng t\u1ef1 nhi\u00ean. T\u1ea1p ch\u00ed L\u00e2m nghi\u1ec7p s\u1ed1 4 n\u0103m 1991.<\/p>\n

Summary<\/h3>\n

Research on reciprocal relation between tree species in natural forest is a difficult and complicated job. For a precise scientific base there must be reliance on biological characteristics and intimate study on phytoxin of each tree species. This paper introduces only a research method based on occurrence frequency of the species. There have been initial found groups of species that commonly occur with Endospermum<\/em> ohinensis<\/em>, Lithocarpus<\/em> fissus<\/em>, Erythrophloeum<\/em> fordu<\/em> and Canarium<\/em> album. This is a preliminary result providing a base for selection and combination of species in mixed plantation establishment.<\/p>\n","protected":false},"excerpt":{"rendered":"

R\u1eebng t\u1ef1 nhiên n\u01b0\u1edbc ta có t\u1ed5 thành loài cây \u0111a d\u1ea1ng và phong phú. Song m\u1ed7i m\u1ed9t loài cây l\u1ea1i có m\u1ed9t vùng phân b\u1ed1 nh\u1ea5t \u0111\u1ecbnh, s\u1ef1 phân b\u1ed1 này có liên quan ch\u1eb7t ch\u1ebd v\u1edbi \u0111i\u1ec1u ki\u1ec7n hoàn c\u1ea3nh c\u1ee7a môi tr\u01b0\u1eddng xung quanh.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[18],"tags":[],"_links":{"self":[{"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/posts\/182"}],"collection":[{"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/comments?post=182"}],"version-history":[{"count":6,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/posts\/182\/revisions"}],"predecessor-version":[{"id":19237,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/posts\/182\/revisions\/19237"}],"wp:attachment":[{"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/media?parent=182"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/categories?post=182"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/tags?post=182"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}