{"id":8579,"date":"2009-03-24T02:18:23","date_gmt":"2009-03-23T19:18:23","guid":{"rendered":"http:\/\/vafs.gov.vn\/vn\/2009\/03\/nghien-cuu-gay-trong-cay-ven-ven-anisoptera-cochinchinensis-lam-nguyen-lieu-go-dan-lang\/"},"modified":"2019-09-25T10:22:34","modified_gmt":"2019-09-25T03:22:34","slug":"nghien-cuu-gay-trong-cay-ven-ven-anisoptera-cochinchinensis-lam-nguyen-lieu-go-dan-lang","status":"publish","type":"post","link":"https:\/\/vafs.gov.vn\/vn\/nghien-cuu-gay-trong-cay-ven-ven-anisoptera-cochinchinensis-lam-nguyen-lieu-go-dan-lang\/","title":{"rendered":"Nghi\u00ean c\u1ee9u g\u00e2y tr\u1ed3ng c\u00e2y V\u00ean v\u00ean (Anisoptera cochinchinensis) l\u00e0m nguy\u00ean li\u1ec7u g\u1ed7 d\u00e1n l\u1ea1ng"},"content":{"rendered":"

B\u00f9i \u0110o\u00e0n, V\u0169 Duy Th\u00f4ng<\/em><\/strong><\/p>\n

Trung t\u00e2m NC Sinh th\u00e1i v\u00e0 M\u00f4i tr\u01b0\u1eddng R\u1eebng <\/em><\/p>\n

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

V\u00ean v\u00ean (Anisoptera cochinchinensis<\/em>) thu\u1ed9c h\u1ecd D\u1ea7u (Dippterocarpaceae<\/em>) l\u00e0 m\u1ed9t trong nh\u1eefng lo\u00e0i c\u00e2y g\u1ed7 c\u00f3 gi\u00e1 tr\u1ecb xu\u1ea5t kh\u1ea9u tr\u00ean th\u1ecb tr\u01b0\u1eddng qu\u1ed1c t\u1ebf (\u0111\u1eb7c bi\u1ec7t \u1edf v\u00f9ng \u0110\u00f4ng Nam\u00e1). G\u1ed7 v\u00ean v\u00ean r\u1ea5t \u0111\u01b0\u1ee3c \u01b0a chu\u1ed9ng trong c\u00f4ng nghi\u1ec7p b\u00f3c, d\u00e1n l\u1ea1ng v\u00e0 \u0111\u00f3ng t\u00e0u thuy\u1ec1n (th\u00e2n tr\u00f2n, th\u1eb3ng, \u00edt u b\u01b0\u1edbu, b\u1ea1nh v\u00e8, g\u1ed7 nh\u1eb9, m\u00e0u s\u00e1ng tr\u1eafng, khi c\u1eaft kh\u00fac c\u00f3 th\u1ec3 cho nh\u1eefng kh\u00fac g\u1ed7 d\u00e0i t\u1eeb 0,7 m- 2 m, \u0111\u01b0\u1eddng k\u00ednh 40- 60 cm). Hi\u1ec7n nay v\u00ean v\u00ean \u0111ang b\u1ecb khai th\u00e1c c\u1ea1n ki\u1ec7t d\u1ea7n. Qua \u0111\u00e1nh gi\u00e1 m\u1ee9c \u0111\u1ed9 \u0111e do\u1ea1 c\u1ee7a m\u1ed9t s\u1ed1 lo\u1ea1i c\u00e2y r\u1eebng Vi\u1ec7t Nam theo ti\u00eau chu\u1ea9n m\u1edbi c\u1ee7a IUCN n\u0103m 1994 (Nguy\u1ec5n Ho\u00e0ng Ngh\u0129a- 1998) th\u00ec v\u00ean v\u00ean \u0111\u01b0\u1ee3c coi l\u00e0 lo\u00e0i \u0111ang nguy c\u1ea5p v\u1edbi m\u1ee9c \u0111\u1ed9 \u0111e do\u1ea1 r\u1ea5t cao c\u1ee7a ho\u1ea1 tuy\u1ec7t ch\u1ee7ng trong t\u01b0\u01a1ng lai g\u1ea7n. V\u00ean v\u00ean \u0111\u01b0\u1ee3c x\u1ebfp v\u00e0o danh l\u1ee5c c\u00e1c c\u00e2y qu\u00fd hi\u1ebfm c\u1ea7n \u0111\u01b0\u1ee3c b\u1ea3o t\u1ed3n. Trong ch\u01b0\u01a1ng tr\u00ecnh ” 5 tri\u1ec7u ha r\u1eebng “, v\u1ea5n \u0111\u1ec1 c\u00e2y l\u00e1 r\u1ed9ng b\u1ea3n \u0111\u1ecba \u0111ang l\u00e0 m\u1ed1i quan t\u00e2m l\u1edbn \u0111\u1ed1i v\u1edbi c\u00e1c nh\u00e0 l\u00e2m nghi\u1ec7p n\u01b0\u1edbc ta. V\u00ean v\u00ean, sao \u0111en, d\u1ea7u n\u01b0\u1edbc l\u00e0 nh\u1eefng lo\u00e0i l\u00e1 r\u1ed9ng b\u1ea3n \u0111\u1ecba \u0111\u01b0\u1ee3c tuy\u1ec3n ch\u1ecdn trong c\u01a1 c\u1ea5u c\u00e2y tr\u1ed3ng c\u00e1c v\u00f9ng ph\u00eda nam. Cho \u0111\u1ebfn nay v\u1eabn ch\u01b0a c\u00f3 quy ph\u1ea1m g\u00e2y tr\u1ed3ng r\u1eebng v\u00ean v\u00ean ph\u1ee5c v\u1ee5 cho s\u1ea3n xu\u1ea5t n\u00ean vi\u1ec7c nghi\u00ean c\u1ee9u g\u00e2y tr\u1ed3ng r\u1eebng v\u00ean v\u00ean l\u00e0 m\u1ed9t y\u00eau c\u1ea7u c\u1ea7n thi\u1ebft v\u00e0 c\u1ea5p b\u00e1ch.<\/p>\n

I. M\u1ee5c ti\u00eau, n\u1ed9i dung, ph\u01b0\u01a1ng ph\u00e1p nghi\u00ean c\u1ee9u<\/p>\n

1.M\u1ee5c ti\u00eau nghi\u00ean c\u1ee9u<\/strong><\/p>\n

+ X\u00e2y d\u1ef1ng quy ph\u1ea1m g\u00e2y tr\u1ed3ng r\u1eebng v\u00ean v\u00ean ph\u1ee5c v\u1ee5 ch\u01b0\u01a1ng tr\u00ecnh “5 tri\u1ec7u ha r\u1eebng”.<\/p>\n

+ G\u00f3p ph\u1ea7n duy tr\u00ec b\u1ea3o t\u1ed3n ngu\u1ed3n gen qu\u00fd hi\u1ebfm c\u1ee7a c\u00e2y h\u1ecd D\u1ea7u.<\/p>\n

+ Th\u1ef1c hi\u1ec7n t\u1eebng b\u01b0\u1edbc ph\u1ee5c h\u1ed3i “H\u1ec7 sinh th\u00e1i” c\u00e2y h\u1ecd D\u1ea7u.<\/p>\n

2.N\u1ed9i dung nghi\u00ean c\u1ee9u <\/strong><\/p>\n

+ Nghi\u00ean c\u1ee9u c\u01a1 s\u1edf sinh th\u00e1i g\u00e2y tr\u00f4ng r\u1eebng v\u00ean v\u00ean.<\/p>\n

+ H\u1ec7 th\u1ed1ng k\u1ef9 thu\u1eadt l\u00e2m sinh tr\u1ed3ng r\u1eebng v\u00ean v\u00ean.<\/p>\n

+ X\u00e2y d\u1ef1ng m\u00f4 h\u00ecnh th\u1eed nghi\u1ec7m tr\u00ean m\u1ed9t s\u1ed1 d\u1ea1ng l\u1eadp \u0111\u1ecba ch\u1ee7 y\u1ebfu.<\/p>\n

+ X\u00e2y d\u1ef1ng quy ph\u1ea1m tr\u1ed3ng r\u1eebng v\u00ean v\u00ean.<\/p>\n

3.Ph\u01b0\u01a1ng ph\u00e1p nghi\u00ean c\u1ee9u<\/strong><\/p>\n

+ Nghi\u00ean c\u1ee9u ph\u00e2n b\u1ed1 t\u1ef1 nhi\u00ean c\u1ee7a v\u00ean v\u00ean \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh tr\u00ean c\u01a1 s\u1edf b\u1ea3n \u0111\u1ed3 ph\u00e2n b\u1ed1 c\u00e1c lo\u1ea1i c\u00e2y g\u1ed7 kinh t\u1ebf \u1edf Vi\u1ec7t Nam (Paul Morand, 1968) \u0111\u1ed3ng th\u1eddi x\u00e1c \u0111\u1ecbnh gi\u1edbi h\u1ea1n tr\u00ean v\u00e0 d\u01b0\u1edbi c\u1ee7a v\u00f9ng ph\u00e2n b\u1ed1 theo \u0111\u1ed9 cao, v\u0129 \u0111\u1ed9 (ph\u01b0\u01a1ng ph\u00e1p x\u00e2y d\u1ef1ng b\u1ea3n \u0111\u1ed3 \u0111\u1ecba th\u1ef1c v\u1eadt c\u1ee7a D. Vusinski).<\/p>\n

+ Nghi\u00ean c\u1ee9u t\u1eadp t\u00ednh sinh h\u1ea1t c\u1ee7a v\u00ean v\u00ean th\u00f4ng qua m\u00e0ng l\u01b0\u1edbi theo d\u00f5i v\u1eadt h\u1eadu li\u00ean t\u1ee5c 5 n\u0103m (1995-1999) c\u1ee7a 23 c\u00e2y m\u1eb9 t\u1ea1i nh\u1eefng v\u00f9ng c\u00f3 v\u00ean v\u00ean (k\u1ec3 c\u1ea3 ph\u00e2n b\u1ed1 t\u1ef1 nhi\u00ean l\u1eabn c\u00e2y tr\u1ed3ng t\u1eeb Kon Tum- \u0110\u1eafk L\u1eafk \u0111\u1ebfn V\u0169ng T\u00e0u, B\u00e0 R\u1ecba).<\/p>\n

+ Nghi\u00ean c\u1ee9u “Nh\u00f3m sinh th\u00e1i” trong qu\u1ea7n th\u1ec3 theo ph\u01b0\u01a1ng ph\u00e1p \u0111\u1ecbnh l\u01b0\u1ee3ng c\u1ee7a Gounot.M. \u0110\u1ec3 x\u00e1c \u0111\u1ecbnh ” Nh\u00f3m sinh th\u00e1i” c\u1ee7a v\u00ean v\u00ean trong r\u1eebng t\u1ef1 nhi\u00ean, ch\u00fang t\u00f4i \u0111\u00e3 thu th\u1eadp 32 \u00f4 ti\u00eau chu\u1ea9n \u0111o \u0111\u1ebfm \u0111\u1ecba th\u1ef1c v\u1eadt (S = 500 m2<\/sup>) c\u00f3 v\u00ean v\u00ean ph\u00e2n b\u1ed1 t\u1ef1 nhi\u00ean t\u1ea1i 4 \u0111\u1ecba \u0111i\u1ec3m: L\u00e2m tr\u01b0\u1eddng Ngh\u0129a Trung (B\u00f9 \u0110\u0103ng), L\u00e2m tr\u01b0\u1eddng T\u00e2n Ph\u00fa (\u0110\u1ed3ng Nai), \u0110\u00f4ng Giang (B\u00ecnh Thu\u1eadn) v\u00e0 L\u00e2m tr\u01b0\u1eddng Eatul(\u0110\u1eafc L\u1eafk), sau \u0111\u00f3 d\u00f9ng ph\u00e9p th\u1eed c2<\/sup>\u0111\u1ec3 ki\u1ec3m tra m\u1ed1i li\u00ean h\u1ec7 v\u00e0 ph\u1ee5 thu\u1ed9c c\u1ee7a c\u00e1c lo\u00e0i trong \u00f4 ti\u00eau chu\u1ea9n.<\/p>\n

Nghi\u00ean c\u1ee9u ti\u1ec1m n\u0103ng \u0111\u1ed9ng th\u00e1i t\u00e1i sinh t\u1ef1 nhi\u00ean c\u1ee7a v\u00ean v\u00ean \u0111\u01b0\u1ee3c ti\u1ebfn h\u00e0nh tr\u00ean 4 khu v\u1ef1c: T\u00e1i sinh \u1edf b\u00eca r\u1eebng, t\u00e1i sinh ngay tr\u00ean khu v\u1ef1c \u0111\u00e3 khai th\u00e1c, t\u00e1i sinh d\u01b0\u1edbi t\u00e1n r\u1eebng v\u00e0 t\u00e1i sinh d\u01b0\u1edbi c\u00e1c l\u1ed7 tr\u1ed3ng trong r\u1eebng (n\u1ed9i dung thu th\u1eadp s\u1ed1 li\u1ec7u theo c\u00e1c ph\u01b0\u01a1ng ph\u00e1p l\u00e2m h\u1ecdc kinh \u0111i\u1ec3n).<\/p>\n

+ Nghi\u00ean c\u1ee9u k\u1ef9 thu\u1eadt t\u1ea1o r\u1eebng theo 2 ph\u01b0\u01a1ng th\u1ee9c ch\u00ednh:<\/p>\n

– Tr\u1ed3ng r\u1eebng t\u1eadp trung (theo ki\u1ec3u tr\u1ed3ng r\u1eebng c\u00f4ng nghi\u1ec7p) nh\u1eb1m \u0111i t\u1edbi x\u00e2y d\u1ef1ng l\u00e2m ph\u1ea7n \u0111\u1ed3ng tu\u1ed5i.<\/p>\n

– L\u00e0m gi\u00e0u r\u1eebng theo ph\u01b0\u01a1ng th\u1ee9c kinh doanh r\u1eebng kh\u00e1c tu\u1ed5i.<\/p>\n

+ X\u00e2y d\u1ef1ng c\u00e1c m\u00f4 h\u00ecnh th\u1eed nghi\u1ec7m t\u1ea1i 2 v\u00f9ng \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh v\u00f9ng tr\u1ed3ng v\u00ean v\u00ean:<\/p>\n

– Trong v\u00f9ng ph\u00e2n b\u1ed1 t\u1ef1 nhi\u00ean: B\u1ea7u B\u00e0ng, Ph\u1ee9c T\u00e2n (\u0110\u1ed3ng Nai).<\/p>\n

– Ngo\u00e0i v\u00f9ng ph\u00e2n b\u1ed1 t\u1ef1 nhi\u00ean: Kon H\u00e0 N\u1eebng (Gia Lai).<\/p>\n

II.K\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u<\/p>\n

1.C\u01a1 s\u1edf sinh th\u00e1i g\u00e2y tr\u1ed3ng v\u00ean v\u00ean<\/strong><\/p>\n

\u00b7 V\u00f9ng ph\u00e2n b\u1ed1 t\u1ef1 nhi\u00ean c\u1ee7a v\u00ean v\u00ean \u1edf Vi\u1ec7t <\/em><\/strong>Nam<\/em><\/strong>:<\/em><\/strong><\/p>\n

V\u00ean v\u00ean ph\u00e2n b\u1ed1 ch\u1ee7 y\u1ebfu trong r\u1eebng nguy\u00ean sinh, trong c\u00e1c \u0111ai chuy\u1ec3n ti\u1ebfp t\u1eeb r\u1eebng l\u00e1 r\u1ed9ng th\u01b0\u1eddng xanh sang r\u1eebng c\u00e2y h\u1ecd D\u1ea7u t\u1ea1i c\u00e1c t\u1ec9nh \u1edf mi\u1ec1n nam Vi\u1ec7t Nam (t\u1eeb v\u0129 tuy\u1ebfn 15 tr\u1edf xu\u1ed1ng) nh\u01b0 Sa Th\u1ea7y (Kon Tum), \u0110\u1ee9c C\u01a1, Ch\u01b0 Ph\u1ea3 (Gia Lai), Easup, Eatul, B\u1ea3n \u0110\u00f4n (\u0110\u1eafk L\u0103k), L\u1ed9c Minh, B\u00f9 \u0110\u0103ng, \u0110\u1ed3ng Ph\u00fa (S\u00f4ng B\u00e9), Xuy\u00ean M\u1ed9c, T\u00e2n Ph\u00fa, C\u00e1t Ti\u00ean (\u0110\u1ed3ng Nai), T\u00e2n Bi\u00ean (T\u00e2y Ninh), H\u00e0m T\u00e2n (B\u00ecnh Thu\u1eadn)<\/p>\n

\u00b7 C\u00e1c \u0111i\u1ec1u ki\u1ec7n l\u1eadp \u0111\u1ecba:<\/em><\/strong><\/p>\n

C\u00e2y v\u00ean v\u00ean l\u00e0 m\u1ed9t trong nh\u1eefng lo\u00e0i \u0111\u1eb7c h\u1eefu \u1edf mi\u1ec1n nam Vi\u1ec7t Nam, ch\u1ec9 ph\u00e2n b\u1ed1 \u1edf m\u1ed9t s\u1ed1 d\u1ea1ng l\u1eadp \u0111\u1ecba nh\u1ea5t \u0111\u1ecbnh v\u1edbi c\u00e1c lo\u1ea1i \u0111i\u1ec1u ki\u1ec7n kh\u00ed h\u1eadu, th\u1ed5 nh\u01b0\u1ee1ng nh\u01b0 sau (xem b\u1ea3ng 1 v\u00e0 2).<\/p>\n

\u00b7 \u0110\u1eb7c \u0111i\u1ec3m t\u00e1i sinh c\u1ee7a v\u00ean v\u00ean:<\/em><\/strong><\/p>\n

V\u00ean v\u00ean l\u00e0 lo\u00e0i c\u00e2y g\u1ed7 c\u00f3 t\u1eadp t\u00ednh sinh h\u1ea1t kh\u00f4ng \u0111\u1ec1u (chu k\u1ef3 ra hoa th\u1ea5t th\u01b0\u1eddng). Qua 5 n\u0103m quan s\u00e1t tr\u00ean 23 c\u00e2y m\u1eb9 t\u1ea1i m\u1ed9t s\u1ed1 v\u00f9ng sinh th\u00e1i cho th\u1ea5y nh\u01b0 sau (b\u1ea3ng 3).<\/p>\n

B\u1ea3ng 1.Ch\u1ebf \u0111\u1ed9 nhi\u1ec7t \u1ea9m \u0111\u1ed9 \u1edf m\u1ed9t s\u1ed1 v\u00f9ng ph\u00e2n b\u1ed1 v\u00ean v\u00ean.<\/em><\/p>\n\n\n\n\n\n\n\n\n\n
TT<\/td>\n\u0110\u1ecba Ph\u01b0\u01a1ng<\/td>\nNhi\u1ec7t \u0111\u1ed9 b\u00ecnh qu\u00e2n n\u0103m (0<\/sup>C)<\/td>\nNhi\u1ec7t \u0111\u1ed9 kh\u00f4ng kh\u00ed cao nh\u1ea5t (0<\/sup>C)<\/td>\nNhi\u1ec7t \u0111\u1ed9 kh\u00f4ng kh\u00ed th\u1ea5p nh\u1ea5t (0<\/sup>C)<\/td>\nBi\u00ean \u0111\u1ed9 nhi\u1ec7t trung b\u00ecnh (0<\/sup>C)<\/td>\nL\u01b0\u1ee3ng m\u01b0a b\u00ecnh qu\u00e2n n\u0103m (mm)<\/td>\nS\u1ed1 th\u00e1ng kh\u00f4 h\u1ea1n (t)<\/td>\n\u0110\u1ed9 \u1ea9m t\u01b0\u01a1ng \u0111\u1ed1i trung b\u00ecnh (%)<\/td>\nX\u1ebfp lo\u1ea1i<\/td>\n<\/tr>\n
1<\/td>\nKon Tum<\/td>\n23.4<\/td>\n39<\/td>\n5.5<\/td>\n> 10<\/td>\n1805<\/td>\n4-6<\/td>\n< 85<\/td>\nH\u01a1i \u1ea9m<\/td>\n<\/tr>\n
2<\/td>\nGia Lai<\/td>\n21.8<\/td>\n36<\/td>\n5.7<\/td>\n> 10<\/td>\n2172<\/td>\n4-6<\/td>\n< 85<\/td>\nH\u01a1i \u1ea9m<\/td>\n<\/tr>\n
3<\/td>\n\u0110\u1eafc L\u1eafc<\/td>\n23.7<\/td>\n38.1<\/td>\n7.4<\/td>\n> 10<\/td>\n1773<\/td>\n4-6<\/td>\n< 85<\/td>\nH\u01a1i kh\u00f4<\/td>\n<\/tr>\n
4<\/td>\n\u0110\u1ed3ng Nai<\/td>\n27.0<\/td>\n38.3<\/td>\n13.2<\/td>\n> 10<\/td>\n2141<\/td>\n4-6<\/td>\n< 85<\/td>\nH\u01a1i \u1ea9m<\/td>\n<\/tr>\n
5<\/td>\nS\u00f4ng B\u00e9<\/td>\n25.3<\/td>\n38.5<\/td>\n10.7<\/td>\n> 10<\/td>\n2140<\/td>\n4-6<\/td>\n< 85<\/td>\nH\u01a1i \u1ea9m<\/td>\n<\/tr>\n
6<\/td>\nB\u00ecnh Thu\u1eadn<\/td>\n26.6<\/td>\n37.6<\/td>\n12.4<\/td>\n> 10<\/td>\n1152<\/td>\n4-6<\/td>\n< 85<\/td>\nH\u01a1i kh\u00f4<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

B\u1ea3ng 2. \u0110\u1eb7c \u0111i\u1ec3m l\u00fd ho\u00e1 t\u00ednh c\u1ee7a \u0111\u1ea5t c\u00f3 v\u00ean v\u00ean ph\u00e2n b\u1ed1 t\u1ef1 nhi\u00ean.<\/em><\/p>\n\n\n\n\n\n\n\n
\u0110\u1ecba \u0111i\u1ec3m<\/td>\nPHH2O<\/sub><\/td>\nM\u00f9n (%)<\/td>\nD\u1ec5 ti\u00eau<\/p>\n

(mg\/ 100g)<\/td>\n

Ch\u01b0a trao \u0111\u1ed5i<\/td>\nCa++<\/sup><\/td>\nMg++<\/sup><\/td>\nTh\u00e0nh ph\u1ea7n c\u01a1 gi\u1edbi<\/p>\n

(% c\u1ea5p h\u1ea1t)<\/td>\n<\/tr>\n

P2<\/sub>O5<\/sub><\/td>\nK2<\/sub>O<\/td>\nAl+++<\/sup><\/td>\nH+<\/sup><\/td>\n2-0.02<\/td>\n0.02<\/p>\n

-0.002<\/td>\n

<0.002<\/td>\n<\/tr>\n
L\u00e2m tr\u01b0\u1eddng Ngh\u0129a Trung<\/td>\n4.6<\/td>\n2.29<\/td>\n1.8<\/td>\n1.13<\/td>\n1.01<\/td>\n0.1<\/td>\n0.79<\/td>\n0.45<\/td>\n25.60<\/td>\n34.20<\/td>\n40.20<\/td>\n<\/tr>\n
L\u00e2m tr\u01b0\u1eddng T\u00e2n Ph\u00fa (\u0110\u1ed3ng Nai)<\/td>\n4.2<\/td>\n3.31<\/td>\n4.4<\/td>\n18.7<\/td>\n0.52<\/td>\n0.01<\/td>\n2.55<\/td>\n0.68<\/td>\n30.53<\/td>\n18.83<\/td>\n50.63<\/td>\n<\/tr>\n
R\u1eebng gi\u1ed1ng \u0110\u00f4ng Giang (B\u00ecnh Thu\u1eadn)<\/td>\n4.4<\/td>\n1.51<\/td>\n1.1<\/td>\n2.5<\/td>\n0.33<\/td>\n0.08<\/td>\n0.45<\/td>\n0.15<\/td>\n46.60<\/td>\n25.19<\/td>\n28.21<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

B\u1ea3ng 3. <\/em>Chu<\/em>k\u1ef3 ra hoa v\u00ean v\u00ean \u1edf m\u1ed9t s\u1ed1 v\u00f9ng sinh th\u00e1i.<\/em><\/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
TT<\/strong><\/td>\n\u0110\u1ecba \u0111i\u1ec3m<\/td>\nD1.3<\/sub><\/td>\nHl<\/td>\nDt<\/td>\n1995<\/td>\n1996<\/td>\n1997<\/td>\n1998<\/td>\n1999<\/td>\n<\/tr>\n
1<\/td>\nTh\u1ecb x\u00e3 Kon Tum<\/td>\n98<\/td>\n35<\/td>\n16.4<\/td>\n+++<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n++<\/td>\n<\/tr>\n
2<\/td>\nTh\u1ecb x\u00e3 Kon Tum<\/td>\n85<\/td>\n30<\/td>\n12<\/td>\n+++<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n+<\/td>\n<\/tr>\n
3<\/td>\nTh\u1ecb x\u00e3 Kon Tum<\/td>\n82<\/td>\n35<\/td>\n13.2<\/td>\n++<\/td>\n–<\/td>\n+<\/td>\n+<\/td>\n—<\/td>\n<\/tr>\n
4<\/td>\nTr\u00e0 B\u00e1 (Gia Lai)<\/td>\n36<\/td>\n19<\/td>\n6.2<\/td>\n–<\/td>\n–<\/td>\n+<\/td>\n–<\/td>\n+<\/td>\n<\/tr>\n
5<\/td>\nTr\u00e0 B\u00e1 (Gia Lai)<\/td>\n44<\/td>\n20<\/td>\n5.4<\/td>\n–<\/td>\n–<\/td>\n+<\/td>\n–<\/td>\n+<\/td>\n<\/tr>\n
6<\/td>\nTr\u00e0 B\u00e1 (Gia Lai)<\/td>\n38<\/td>\n19<\/td>\n4.2<\/td>\n–<\/td>\n–<\/td>\n+<\/td>\n–<\/td>\n+<\/td>\n<\/tr>\n
7<\/td>\nTr\u00e0 B\u00e1 (Gia Lai)<\/td>\n41<\/td>\n19<\/td>\n6.0<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n+<\/td>\n<\/tr>\n
8<\/td>\nEatu (\u0110\u1eafc L\u1eafc)<\/td>\n42<\/td>\n25<\/td>\n6.8<\/td>\n+++<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n++<\/td>\n<\/tr>\n
9<\/td>\nEatu (\u0110\u1eafc L\u1eafc)<\/td>\n48<\/td>\n25<\/td>\n10.2<\/td>\n+++<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n++<\/td>\n<\/tr>\n
10<\/td>\nB\u1ea3n \u0110\u00f4n (\u0110\u1eafc L\u1eafc)<\/td>\n57<\/td>\n30<\/td>\n10.6<\/td>\n++<\/td>\n+<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n<\/tr>\n
11<\/td>\nTr\u1ea3ng Bom (\u0110\u1ed3ng Nai)<\/td>\n40<\/td>\n25<\/td>\n6.4<\/td>\n+++<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n++<\/td>\n<\/tr>\n
12<\/td>\nTr\u1ea3ng Bom (\u0110\u1ed3ng Nai)<\/td>\n58<\/td>\n25<\/td>\n8.8<\/td>\n+++<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n++<\/td>\n<\/tr>\n
13<\/td>\nLong Th\u00e0nh (\u0110\u1ed3ng Nai)<\/td>\n23<\/td>\n15<\/td>\n4.6<\/td>\n+++<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n+++<\/td>\n<\/tr>\n
14<\/td>\nLong Th\u00e0nh (\u0110\u1ed3ng Nai)<\/td>\n46<\/td>\n15<\/td>\n6.2<\/td>\n++<\/td>\n+<\/td>\n–<\/td>\n–<\/td>\n++<\/td>\n<\/tr>\n
15<\/td>\nLong Th\u00e0nh (\u0110\u1ed3ng Nai)<\/td>\n55<\/td>\n20<\/td>\n7.2<\/td>\n++<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n+++<\/td>\n<\/tr>\n
16<\/td>\nB\u00ecnh D\u01b0\u01a1ng (S\u00f4ng B\u00e9)<\/td>\n53<\/td>\n30<\/td>\n8.6<\/td>\n++<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n++<\/td>\n<\/tr>\n
17<\/td>\nB\u00ecnh D\u01b0\u01a1ng (S\u00f4ng B\u00e9)<\/td>\n57<\/td>\n25<\/td>\n10.1<\/td>\n+++<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n+++<\/td>\n<\/tr>\n
18<\/td>\nNgh\u0129a Trung (B\u00f9 \u0110\u0103ng)<\/td>\n63<\/td>\n30<\/td>\n8.7<\/td>\n+++<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n++<\/td>\n<\/tr>\n
19<\/td>\nB\u00ecnh D\u01b0\u01a1ng (S\u00f4ng B\u00e9)<\/td>\n72<\/td>\n30<\/td>\n10.5<\/td>\n+++<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n+<\/td>\n<\/tr>\n
20<\/td>\nB\u00ecnh D\u01b0\u01a1ng (S\u00f4ng B\u00e9)<\/td>\n49<\/td>\n25<\/td>\n8.2<\/td>\n+++<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n+++<\/td>\n<\/tr>\n
21<\/td>\nLong H\u1ea3i (B\u00e0 R\u1ecba)<\/td>\n64<\/td>\n30<\/td>\n12.4<\/td>\n+<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n+<\/td>\n<\/tr>\n
22<\/td>\n\u0110\u00f4ng Giang (B\u00ecnh Thu\u1eadn)<\/td>\n45<\/td>\n22<\/td>\n6.4<\/td>\n++<\/td>\n–<\/td>\n–<\/td>\n(+)<\/td>\n(+)<\/td>\n<\/tr>\n
23<\/td>\n\u0110\u00f4ng Giang (B\u00ecnh Thu\u1eadn)<\/td>\n51<\/td>\n25<\/td>\n6.8<\/td>\n++<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n(+)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Ghi ch\u00fa: +++ : nhi\u1ec1u ; ++ : trung b\u00ecnh ; + : \u00edt ; – : kh\u00f4ng c\u00f3<\/em><\/p>\n

H\u1ea1t v\u00ean v\u00ean m\u1ea5t s\u1ee9c n\u1ea3y m\u1ea7m r\u1ea5t nhanh v\u00e0 kh\u00f3 b\u1ea3o qu\u1ea3n (B\u1ea3ng 4)<\/p>\n

B\u1ea3ng 4.Kh\u1ea3 n\u0103ng n\u1ea3y m\u1ea7m c\u1ee7a h\u1ea1t V\u00ean v\u00ean sau t\u1eebng th\u1eddi gian b\u1ea3o qu\u1ea3n.<\/em><\/p>\n\n\n\n\n\n
Th\u1eddi gian b\u1ea3o qu\u1ea3n (ng\u00e0y)<\/td>\n2<\/td>\n4<\/td>\n8<\/td>\n12<\/td>\n16<\/td>\n20<\/td>\n24<\/td>\n28<\/td>\n32<\/td>\n36<\/td>\n<\/tr>\n
N\u0103ng l\u1ef1c n\u1ea3y m\u1ea7m (%)<\/td>\n93<\/td>\n84<\/td>\n57<\/td>\n52<\/td>\n28<\/td>\n15<\/td>\n15<\/td>\n2<\/td>\n–<\/td>\n–<\/td>\n<\/tr>\n
\u0110\u1ed1i ch\u1ee9ng (%)<\/td>\n89<\/td>\n89<\/td>\n45<\/td>\n35<\/td>\n23<\/td>\n8<\/td>\n5<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

* Ti\u1ec1m n\u0103ng, \u0111\u1ed9ng th\u00e1i t\u00e1i sinh: \u0110\u00e1nh gi\u00e1 s\u1ed1 l\u01b0\u1ee3ng, ch\u1ea5t l\u01b0\u1ee3ng c\u00e2y t\u00e1i sinh t\u1ea1i 4 \u0111\u1ecba \u0111i\u1ec3m kh\u1ea3o s\u00e1t (v\u00f9ng b\u00eca r\u1eebng, d\u01b0\u1edbi t\u00e1n r\u1eebng, l\u1ed7 tr\u1ed1ng trong r\u1eebng, tr\u00ean khu khai th\u00e1c) cho th\u1ea5y t\u00e1i sinh V\u00ean v\u00ean \u1edf v\u00f9ng b\u00eca r\u1eebng l\u00e0 t\u1ed1t h\u01a1n c\u1ea3 (B\u1ea3ng 5).<\/p>\n

B\u1ea3ng 5. B\u1ea3ng ph\u00e2n b\u1ed1 m\u1eadt \u0111\u1ed9 c\u00e2y t\u00e1i sinh v\u00ean v\u00ean theo c\u1ea5p chi\u1ec1u cao H.<\/em><\/p>\n

(Ghi ch\u00fa: Tr\u1ecb s\u1ed1 trong ngo\u1eb7c \u0111\u01a1n l\u00e0 s\u1ed1 l\u01b0\u1ee3ng c\u1ee7a c\u00e1c lo\u00e0i n\u00f3i chung).<\/p>\n\n\n\n\n\n\n\n\n
TT<\/td>\n\u0110\u1ecba \u0111i\u1ec3m<\/td>\nM\u1eadt \u0111\u1ed9\/ha<\/td>\nC\u1ea5p H (cm)<\/td>\n<\/tr>\n
Hi\u1ec7n tr\u1ea1ng<\/td>\n\u00e5<\/td>\n< 50<\/td>\n51-99<\/td>\n100-149<\/td>\n150-200<\/td>\n>200<\/td>\n<\/tr>\n
1<\/td>\nNgh\u0129a Trung<\/p>\n

(B\u00f9 \u0110\u0103ng)<\/td>\n

R\u1eebng kh\u00e9p t\u00e1n<\/td>\n160<\/p>\n

(2560)<\/td>\n

80<\/p>\n

(800)<\/td>\n

–<\/p>\n

(1360)<\/td>\n

40<\/p>\n

(160)<\/td>\n

–<\/p>\n

(120)<\/td>\n

40<\/p>\n

(120)<\/td>\n<\/tr>\n

2<\/td>\nL\u1ed7 tr\u1ed1ng trong r\u1eebng<\/td>\n320<\/p>\n

(3320)<\/td>\n

40<\/p>\n

(1000)<\/td>\n

80<\/p>\n

(1080)<\/td>\n

80<\/p>\n

(440)<\/td>\n

80<\/p>\n

(440<\/td>\n

40<\/p>\n

(360)<\/td>\n<\/tr>\n

3<\/td>\nB\u00eca r\u1eebng<\/td>\n720<\/p>\n

(4640)<\/td>\n

280<\/p>\n

(2600)<\/td>\n

200<\/p>\n

(880)<\/td>\n

120<\/p>\n

(280)<\/td>\n

80<\/p>\n

(240)<\/td>\n

40<\/p>\n

(640)<\/td>\n<\/tr>\n

4<\/td>\n\u0110\u00f4ng Giang (B\u00ecnh Thu\u1eadn)<\/td>\nKhu khai th\u00e1c<\/p>\n

(5 n\u0103m)<\/td>\n

2040<\/p>\n

(6800)<\/td>\n

1560<\/p>\n

(3600)<\/td>\n

280<\/p>\n

(1280)<\/td>\n

40<\/p>\n

(600)<\/td>\n

80<\/p>\n

(320)<\/td>\n

80<\/p>\n

(200)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

2. X\u00e2y d\u1ef1ng m\u00f4 h\u00ecnh th\u1eed nghi\u1ec7m<\/strong><\/p>\n

M\u00f4 h\u00ecnh th\u1eed nghi\u00eam \u0111\u01b0\u1ee3c x\u00e2y d\u1ef1ng tr\u00ean m\u1ed9t s\u1ed1 d\u1ea1ng l\u1eadp \u0111\u1ecba ch\u1ee7 y\u1ebfu theo hai ph\u01b0\u01a1ng th\u1ee9c k\u1ef9 thu\u1eadt g\u00e2y tr\u1ed3ng (b\u1ea3ng 6).<\/p>\n

B\u1ea3ng 6. \u0110i\u1ec1u ki\u1ec7n l\u1eadp \u0111\u1ecba c\u00e1c v\u00f9ng x\u00e2y d\u1ef1ng m\u00f4 h\u00ecnh<\/em><\/strong><\/p>\n\n\n\n\n\n\n\n\n
\u0110\u1ecba \u0111i\u1ec3m<\/td>\nL\u1eadp \u0111\u1ecba<\/td>\nPh\u01b0\u01a1ng th\u1ee9c l\u00e2m sinh<\/td>\n<\/tr>\n
Th\u1ed5 nh\u01b0\u1ee1ng<\/td>\nKh\u00ed h\u1eadu<\/td>\nTh\u1ea3m r\u1eebng<\/td>\n<\/tr>\n
Lo\u1ea1i \u0111\u1ea5t<\/td>\nTh\u00e0nh ph\u1ea7n c\u01a1 gi\u1edbi<\/td>\n\u0110\u1ed9 s\u00e2u t\u1ea7ng \u0111\u1ea5t<\/p>\n

(cm)<\/td>\n

\u0110\u1ed9 tho\u00e1t n\u01b0\u1edbc<\/td>\nM\u00f9n (%)<\/td>\nPH<\/td>\n<\/tr>\n
Ph\u00fa B\u00ecnh<\/p>\n

(S\u00f4ng B\u00e9)<\/td>\n

\u0110\u1ea5t x\u00e1m ph\u00e1t tri\u1ec3n tr\u00ean phi\u1ebfn th\u1ea1ch s\u00e9t<\/td>\nNh\u1eb9-trung b\u00ecnh,c\u1ea5p \u0111\u1ed9 d\u1ed1c I (<50<\/sup>)<\/td>\n> 50<\/td>\nT\u1ed1t<\/td>\n1.58<\/td>\n4-4.5<\/td>\n\u0110i\u1ec1u ki\u1ec7n nhi\u1ec7t phong ph\u00fa, l\u01b0\u1ee3ng m\u01b0a bq n\u0103m 2000- 2200 mm, t\u1eadp trung v\u00e0o c\u00e1c th\u00e1ng 6,7,8 c\u1ea3 2 m\u00f9a \u0111\u1ec1u \u0111\u1ee7 \u1ea9m<\/td>\nR\u1eebng ki\u1ec7t ch\u1ec9 c\u00f2n c\u00e2y b\u1ee5i, th\u1ea3m t\u01b0\u01a1i, d\u00e2y leo, ch\u1ea5t l\u01b0\u1ee3ng t\u00e1i sinh k\u00e9m<\/td>\nL\u00e0m gi\u00e0u r\u1eebng<\/td>\n<\/tr>\n
B\u1ea7u B\u1eb1ng (S\u00f4ng B\u00e9)<\/td>\n\u0110\u1ea5t x\u00e1m b\u1ea1c m\u00e0u tr\u00ean ph\u00f9 sa c\u1ed5<\/td>\nNh\u1eb9-trung b\u00ecnh, c\u1ea5p \u0111\u1ed9 d\u1ed1c I (<50<\/sup>)<\/td>\n> 50<\/td>\nt\u1ed1t<\/td>\n0.88<\/td>\n4-4.2<\/td>\n\u0110i\u1ec1u ki\u1ec7n nhi\u1ec7t phong ph\u00fa, nhi\u1ec7t \u0111\u1ed9 bq th\u00e1ng l\u1ea1nh nh\u1ea5t 200<\/sup>-220. <\/sup>L\u01b0\u1ee3ng m\u01b0a bq h\u00e0ng n\u0103m 1800-2000mm<\/sup>, t\u1eadp trung v\u00e0o c\u00e1c th\u00e1ng 7,8,9, m\u00f9a h\u1ea1 \u0111\u1ee7 \u1ea9m, m\u00f9a \u0111\u00f4ng thi\u1ebfu \u1ea9m<\/td>\nC\u1ecf l\u00f4ng l\u1ee3n, d\u00e2y leo, sau khai th\u00e1c tr\u1eafng B\u1ea1ch \u0110\u00e0n<\/td>\nC\u1ea3i t\u1ea1o theo b\u0103ng v\u00e0 c\u1ea3i t\u1ea1o tr\u1eafng<\/td>\n<\/tr>\n
Kon H\u00e0 N\u1eebng<\/p>\n

(Gia Lai)<\/td>\n

Feralit \u0111\u1ecf v\u00e0ng tr\u00ean Bazan<\/td>\nTrung b\u00ecnh c\u1ea5p \u0111\u1ed9 d\u1ed1c I (<50<\/sup>)<\/td>\n> 50<\/td>\nTrung b\u00ecnh<\/td>\n3.50<\/td>\n5-5.5<\/td>\n\u0110i\u1ec1u ki\u1ec7n nhi\u1ec7t kh\u00e1 phong ph\u00fa, nhi\u1ec7t \u0111\u1ed9 bq th\u00e1ng l\u1ea1nh nh\u1ea5t 18- 200<\/sup>C. L\u01b0\u1ee3ng m\u01b0a bq n\u0103m 2000-2400 mm. 3 th\u00e1ng m\u01b0a nhi\u1ec1u nh\u1ea5t IX-XI. Nh\u00ecn chung c\u1ea3 2 m\u00f9a \u0111\u1ee7 \u1ea9m<\/td>\nR\u1eebng ngh\u00e8o c\u00f2n l\u00e1c \u0111\u00e1c c\u00e2y g\u1ed7, d\u00e2y leo, ch\u1ea5t l\u01b0\u1ee3ng t\u00e1i sinh kh\u00f4ng \u0111\u1ea3m b\u1ea3o<\/td>\nL\u00e0m gi\u00e0u r\u1eebng<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

– C\u1ea3i t\u1ea1o theo b\u0103ng: B\u0103ng r\u1ed9ng 15 m (m\u1eadt \u0111\u1ed9 tr\u1ed3ng: 1000c\/ ha).<\/p>\n

– L\u00e0m gi\u00e0u r\u1eebng theo r\u1ea1ch: R\u1ea1ch m\u1edf 3 m- 5 m, r\u1ea1ch ch\u1eeba 5 m v\u00e0 10 m (m\u1eadt \u0111\u1ed9 tr\u1ed3ng: 400c\/ ha v\u00e0 250c\/ ha).<\/p>\n

B\u1ea3ng 7. Sinh tr\u01b0\u1edfng c\u1ee7a v\u00ean v\u00ean qua c\u00e1c ph\u01b0\u01a1ng th\u1ee9c g\u00e2y tr\u1ed3ng r\u1eebng.<\/em><\/p>\n

( T\u00e0i li\u1ec7u thu th\u00e2p 6\/ 2000).<\/p>\n\n\n\n\n\n\n\n\n
\u0110\u1ecba \u0111i\u1ec3m<\/p>\n

(n\u0103m tr\u1ed3ng)<\/td>\n

Ph\u01b0\u01a1ng th\u1ee9c l\u00e2m<\/p>\n

sinh<\/td>\n

Sau khi tr\u1ed3ng<\/p>\n

(th\u00e1ng)<\/td>\n

Sinh tr\u01b0\u1edfng c\u00e2y tr\u1ed3ng (cm)<\/td>\n<\/tr>\n
H0<\/sub><\/td>\nHn<\/td>\nDH<\/td>\nHMax<\/td>\nHMin<\/td>\nN\u0103ng l\u1ef1c sinh tr\u01b0\u1edfng<\/td>\n<\/tr>\n
B\u1ea7u B\u00e0ng<\/p>\n

(8\/95)<\/td>\n

C\u1ea3i t\u1ea1o theo b\u0103ng d\u01b0\u1edbi t\u00e1n \u0111\u1eadu tr\u00e0m<\/td>\n57<\/td>\n45<\/td>\n538<\/td>\n98.6<\/td>\n870<\/td>\n330<\/td>\nT\u1ed1t, r\u1eebng non \u0111\u00e3 kh\u00e9p t\u00e1n<\/td>\n<\/tr>\n
B\u1ea7u B\u00e0ng<\/p>\n

(8\/96)<\/td>\n

C\u1ea3i t\u1ea1o tr\u1eafng (h\u1ed7n giao v\u1edbi d\u1ea7u n\u01b0\u1edbc)<\/td>\n45<\/td>\n72<\/td>\n391<\/td>\n79.8<\/td>\n540<\/td>\n260<\/td>\nT\u1ed1t<\/td>\n<\/tr>\n
Ph\u00fa B\u00ecnh<\/p>\n

(6\/97)<\/td>\n

L\u00e0m gi\u00e0u r\u1eebng d\u01b0\u1edbi t\u00e1n c\u00e2y b\u1ee5i<\/td>\n37<\/td>\n50<\/td>\n249<\/td>\n70.71<\/td>\n285<\/td>\n215<\/td>\nT\u1ed1t<\/td>\n<\/tr>\n
Kon H\u00e0 N\u1eebng (6\/97)<\/td>\nL\u00e0m gi\u00e0u r\u1eebng d\u01b0\u1edbi t\u00e1n r\u1eebng ngh\u00e8o ki\u1ec7t<\/td>\n37<\/td>\n45<\/td>\n240<\/td>\n65.20<\/td>\n265<\/td>\n225<\/td>\nTB<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

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

1. C\u01a1 s\u1edf sinh th\u00e1i tr\u1ed3ng r\u1eebng v\u00ean v\u00ean<\/strong><\/p>\n

+ V\u00ean v\u00ean kh\u00f4ng ph\u1ea3i l\u00e0 lo\u1ea1i ra hoa h\u00e0ng n\u0103m nh\u01b0 d\u1ea7u n\u01b0\u1edbc, sao \u0111en. Chuk\u1ef3 ra hoa r\u1ea5t th\u1ea5t th\u01b0\u1eddng v\u00e0 kh\u00f4ng \u1ed5n \u0111\u1ecbnh. Theo d\u00f5i s\u1ed1 li\u1ec7u v\u1eadt h\u1eadu trong n\u0103m cho th\u1ea5y chu k\u1ef3 sai qu\u1ea3 c\u1ee7a v\u00ean v\u00ean t\u1eeb 4- 5 n\u0103m.<\/p>\n

+ M\u1eb7c d\u00f9 V\u00ean v\u00ean l\u00e0 c\u00e2y tr\u1ed3ng g\u1ed7 l\u1edbn, qu\u1ea3 c\u00f3 c\u00e1nh c\u00f3 th\u1ec3 ph\u00e1t t\u00e1n xa t\u1edbi h\u00e0ng tr\u0103m m\u00e9t nh\u01b0ng t\u00e1i sinh t\u1ef1 nhi\u00ean kh\u00f4ng thu\u1eadn l\u1ee3i (H\u1ea1t gi\u1ed1ng m\u1ea5t s\u1ee9c n\u1ea3y m\u1ea7m r\u1ea5t nhanh, kh\u00f3 b\u1ea3o qu\u1ea3n v\u00e0 th\u01b0\u1eddng b\u1ecb c\u00f4n tr\u00f9ng, s\u00e2u b\u1ecd ph\u00e1 ho\u1ea1i).<\/p>\n

+ V\u00ean v\u00ean l\u00e0 m\u1ed9t lo\u1ea1i c\u00f3 bi\u00ean \u0111\u1ed9 sinh th\u00e1i h\u1eb9p, kh\u00f3 c\u00f3 th\u1ec3 tr\u1ed3ng th\u00e0nh r\u1eebng \u1edf ngo\u00e0i v\u00f9ng ph\u00e2n b\u1ed1 t\u1ef1 nhi\u00ean. \u0110i\u1ec1u ki\u1ec7n l\u1eadp \u0111\u1ecba th\u00edch h\u1ee3p \u0111\u1ec3 tr\u1ed3ng r\u1eebng \u00ean v\u00ean (V\u00f9ng tr\u1ed3ng ch\u1ee7 y\u1ebfu l\u00e0 c\u00e1c t\u1ec9nh mi\u1ec1n \u0110\u00f4ng Nam B\u1ed9 v\u00e0 T\u00e2y Nam B\u1ed9).<\/p>\n

2. K\u1ef9 thu\u1eadt t\u1ea1o r\u1eebng<\/strong><\/p>\n

+ V\u00ean v\u00ean c\u00f3 kh\u1ea3 n\u0103ng tr\u1ed3ng th\u00e0nh r\u1eebng nh\u1eb1m t\u1eebng b\u01b0\u1edbc ph\u1ee5c h\u1ed3i h\u1ec7 sinh th\u00e1i c\u00e2y h\u1ecd D\u1ea7u \u1edf Vi\u1ec7t Nam. \u0110i\u1ec1u ki\u1ec7n k\u1ef9 thu\u1eadt \u0111em l\u1ea1i th\u00e0nh c\u00f4ng trong tr\u1ed3ng r\u1eebng l\u00e0:<\/p>\n

-Ch\u1ecdn \u0111\u00fang l\u1eadp \u0111\u1ecba.<\/p>\n

-\u0110\u1ea3m b\u1ea3o ti\u00eau chu\u1ea9n c\u00e2y con (c\u00e2y con 8 th\u00e1ng \u0111\u1ebfn 1 n\u0103m tu\u1ed5i, c\u00f3 H t\u1eeb 0,6- 0,8 m).<\/p>\n

-Ch\u0103m s\u00f3c k\u1ecbp th\u1eddi v\u00e0 li\u00ean t\u1ee5c trong 5 n\u0103m \u0111\u1ea7u.<\/p>\n

+ V\u00ean v\u00ean r\u1ea5t th\u00edch h\u1ee3p tr\u1ed3ng xen c\u00f9ng v\u1edbi \u0111\u1eadu tr\u00e0m tr\u00ean lo\u1ea1i \u0111\u1ea5t x\u00e1m ph\u00e1t tri\u1ec3n tr\u00ean \u0111\u1ea5t ph\u00f9 sa c\u1ed5.<\/p>\n

+ V\u00ean v\u00ean tr\u1ed3ng theo b\u0103ng ho\u1eb7c tr\u1ed3ng to\u00e0n di\u1ec7n (tr\u1ed3ng c\u00f4ng nghi\u1ec7p), c\u00f3 nhi\u1ec1u kh\u1ea3 n\u0103ng th\u00e0nh c\u00f4ng h\u01a1n so v\u1edbi ph\u01b0\u01a1ng th\u1ee9c l\u00e0m gi\u00e0u r\u1eebng theo r\u1ea1ch v\u00ec V\u00ean v\u00ean l\u00e0 lo\u1ea1i c\u00e2y r\u1ea5t \u01b0a s\u00e1ng. N\u1ebfu s\u1eed d\u1ee5ng ph\u01b0\u01a1ng th\u1ee9c l\u00e0m gi\u00e0u r\u1eebng theo r\u1ea1ch th\u00ec \u0111\u1ed9 m\u1edf c\u1ee7a r\u1ea1ch tr\u1ed3ng kh\u00f4ng \u0111\u01b0\u1ee3c d\u01b0\u1edbi 5 m.<\/p>\n

3. Th\u1ea3o lu\u1eadn<\/strong><\/p>\n

Do th\u1eddi gian v\u00e0 kinh ph\u00ed c\u00f3 h\u1ea1n n\u00ean trong qu\u00e1 tr\u00ecnh tri\u1ec3n khai \u0111\u1ec1 t\u00e0i v\u1eabn c\u00f2n m\u1ed9t s\u1ed1 t\u1ed3n t\u1ea1i sau:<\/p>\n

+ Nghi\u00ean c\u1ee9u n\u1ea5m r\u1ec5 c\u1ed9ng sinh c\u00e2y v\u00ean v\u00ean nh\u1eb1m t\u0103ng s\u1ea3n l\u01b0\u1ee3ng, ch\u1ea5t l\u01b0\u1ee3ng r\u1eebng tr\u1ed3ng.<\/p>\n

+ Nghi\u00ean c\u1ee9u t\u0103ng tr\u01b0\u1edfng c\u1ee7a v\u00ean v\u00ean qua c\u00e1c giai \u0111o\u1ea1n tu\u1ed5i nh\u1eb1m x\u00e1c \u0111\u1ecbnh t\u01b0\u01a1ng quan m\u1eadt \u0111\u1ed9 trong c\u00e1c c\u1ea5p th\u1ebf h\u1ec7.<\/p>\n

+ T\u1ec9a th\u01b0a nu\u00f4i d\u01b0\u1ee1ng r\u1eebng tr\u1ed3ng nh\u1eb1m cung c\u1ea5p s\u1ea3n ph\u1ea9m g\u1ed7 d\u00e1n l\u1ea1ng.<\/p>\n

+ Nghi\u00ean c\u1ee9u g\u00e2y tr\u1ed3ng v\u00ean v\u00ean ngo\u00e0i v\u00f9ng ph\u00e2n b\u1ed1 t\u1ef1 nhi\u00ean th\u00f4ng qua giai \u0111o\u1ea1n chuy\u1ec3n ti\u1ebfp (di th\u1ef1c).<\/p>\n

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

1. Th\u00e1i V\u0103n Tr\u1eebng. Th\u1ea3m th\u1ef1c v\u1eadt r\u1eebng \u1edf Vi\u1ec7t Nam. NXB KHKT 1968.<\/p>\n

2. G. BEAU. C\u01a1 s\u1edf sinh th\u00e1i c\u1ee7a kinh doanh r\u1eebng m\u01b0a (V\u01b0\u01a1ng T\u1ea5n Nh\u1ecb d\u1ecbch- NXB KHKT 1976).<\/p>\n

3. Tr\u1ea7n \u0110\u00ecnh L\u00fd. 1900 lo\u00e0i c\u00e2y c\u00f3 \u00edch \u1edf Vi\u1ec7t Nam. NXB th\u1ebf gi\u1edbi 1993.<\/p>\n

4. FIPI. Vi\u1ec7t Nam Forest Trees- NXB n\u00f4ng nghi\u1ec7p 1996.<\/p>\n

5. Th\u00e1i V\u0103n Tr\u1eebng. Tri\u1ec3n v\u1ecdng ph\u1ee5c h\u1ed3i sinh th\u00e1i h\u1ecd Sao- D\u1ea7u. T\u1eadp san KHLN\/1996.<\/p>\n

6. T\u00e0i li\u1ec7u KHKTLN- Ph\u00e2n Vi\u1ec7n ph\u00eda Namc\u00e1c s\u1ed1 t\u1eeb 1995- 1996.<\/p>\n

7. S.T.MOK. Artificial regeneration of Dipterocarps, 1995<\/p>\n

8. Kantarli. Vegetative propagation of Dipterocarps by cutting in ASEAN region, 1996.9.<\/p>\n

9. Paul Maurand. Politique forestiere \u00e0 enviasager au Vietnamdans l\u2019apere\u2019s la guerre, 1968.<\/p>\n

10. Appanah and J.M. Turnbull. A review of Dipterocarps (Taxonomy, ecology and silviculture). CIFOR 1998.<\/p>\n

Research on planting of Anisoptera conchinchinensis <\/em>for raw material <\/strong><\/p>\n

supply to plywood production<\/strong><\/p>\n

Summary: Anisoptera chochinchinensis is one of the species in Dipterocarpaceae familly that has high economic value in plywood industry and ship biulding. At present this species is being threatened to extinction and its protection and expandsion is a must. Through research on A.cochichinensis planting it is found that this species has small distribution range, only from latitude 150<\/sup> N Southward. Flowering and fruiting of tihs species is irregular, seed is hard to be stored. A. cochinchinensis can be used for industrial forest enrichment planting in closed, moist forest. The research subject has established 4 ha of demonstration models in Bau Bang (Song Be province). The models have been and are being maintained till the technological maturity age is reached.****************************************<\/p>\n","protected":false},"excerpt":{"rendered":"

Vên vên (Anisoptera cochinchinensis) thu\u1ed9c h\u1ecd D\u1ea7u (Dippterocarpaceae) là m\u1ed9t trong nh\u1eefng loài cây g\u1ed7 có giá tr\u1ecb xu\u1ea5t kh\u1ea9u trên th\u1ecb tr\u01b0\u1eddng qu\u1ed1c t\u1ebf (\u0111\u1eb7c bi\u1ec7t \u1edf vùng \u0110ông Namá). G\u1ed7 vên vên r\u1ea5t \u0111\u01b0\u1ee3c \u01b0a chu\u1ed9ng trong công nghi\u1ec7p bóc, dán l\u1ea1ng và \u0111óng tàu thuy\u1ec1n (thân tròn, th\u1eb3ng, ít u b\u01b0\u1edbu, b\u1ea1nh vè, g\u1ed7 nh\u1eb9, màu sáng tr\u1eafng, khi c\u1eaft khúc có th\u1ec3 cho nh\u1eefng khúc g\u1ed7 dài t\u1eeb 0,7 m- 2 m, \u0111\u01b0\u1eddng kính 40- 60 cm). Hi\u1ec7n nay vên vên \u0111ang b\u1ecb khai thác c\u1ea1n ki\u1ec7t d\u1ea7n.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[15,18],"tags":[],"_links":{"self":[{"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/posts\/8579"}],"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=8579"}],"version-history":[{"count":2,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/posts\/8579\/revisions"}],"predecessor-version":[{"id":19322,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/posts\/8579\/revisions\/19322"}],"wp:attachment":[{"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/media?parent=8579"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/categories?post=8579"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/tags?post=8579"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}