{"id":13100,"date":"2014-06-20T10:22:15","date_gmt":"2014-06-20T03:22:15","guid":{"rendered":"http:\/\/vafs.gov.vn\/vn\/?p=13100"},"modified":"2014-06-16T10:26:30","modified_gmt":"2014-06-16T03:26:30","slug":"bao-cao-tom-tat-de-tai-nghien-cuu-dac-diem-lam-hoc-va-de-xuat-bien-phap-ky-thuat-nuoi-duong-xuc-tien-tai-sinh-va-gay-trong-rung-de-an-hat-o-tay-nguyen","status":"publish","type":"post","link":"https:\/\/vafs.gov.vn\/vn\/bao-cao-tom-tat-de-tai-nghien-cuu-dac-diem-lam-hoc-va-de-xuat-bien-phap-ky-thuat-nuoi-duong-xuc-tien-tai-sinh-va-gay-trong-rung-de-an-hat-o-tay-nguyen\/","title":{"rendered":"B\u00e1o c\u00e1o t\u00f3m t\u1eaft \u0111\u1ec1 t\u00e0i: Nghi\u00ean c\u1ee9u \u0111\u1eb7c \u0111i\u1ec3m l\u00e2m h\u1ecdc v\u00e0 \u0111\u1ec1 xu\u1ea5t bi\u1ec7n ph\u00e1p k\u1ef9 thu\u1eadt nu\u00f4i d\u01b0\u1ee1ng, x\u00fac ti\u1ebfn t\u00e1i sinh v\u00e0 g\u00e2y tr\u1ed3ng r\u1eebng d\u1ebb \u0103n h\u1ea1t \u1edf T\u00e2y Nguy\u00ean"},"content":{"rendered":"

ThS. Tr\u1ea7n L\u00e2m \u0110\u1ed3ng; ThS. Nguy\u1ec5n To\u00e0n Th\u1eafng<\/em><\/p>\n

(i). \u0110\u1eb7t v\u1ea5n \u0111\u1ec1<\/b><\/p>\n

T\u00e2y Nguy\u00ean l\u00e0 v\u00f9ng c\u00f3 \u0111i\u1ec1u ki\u1ec7n kh\u00ed h\u1eadu, th\u1ed5 nh\u01b0\u1ee1ng, \u0111\u1ecba h\u00ecnh kh\u00e1 \u0111a d\u1ea1ng v\u1eeba c\u00f3 kh\u00ed h\u1eadu nhi\u1ec7t \u0111\u1edbi, v\u1eeba c\u00f3 kh\u00ed h\u1eadu \u00e1 nhi\u1ec7t \u0111\u1edbi, \u0111\u1ecba h\u00ecnh c\u00f3 s\u1ef1 ch\u00eanh l\u1ec7ch v\u1ec1 \u0111\u1ed9 cao t\u1ea1o \u0111i\u1ec1u ki\u1ec7n thu\u1eadn l\u1ee3i cho ph\u00e2n b\u1ed1 c\u1ee7a nhi\u1ec1u lo\u00e0i d\u1ebb, trong \u0111\u00f3 c\u00f3 m\u1ed9t s\u1ed1 lo\u00e0i d\u1ebb \u0103n h\u1ea1t. D\u1ebb \u0103n h\u1ea1t l\u00e0 nh\u00f3m lo\u00e0i c\u00e2y b\u1ea3n \u0111\u1ecba \u0111a t\u00e1c d\u1ee5ng v\u00e0 c\u00f3 gi\u00e1 tr\u1ecb kinh t\u1ebf cao: g\u1ed7 c\u00f3 th\u1ec3 l\u00e0m nh\u00e0, \u0111\u1ed3 gia d\u1ee5ng,… \u0111\u1eb7c bi\u1ec7t h\u1ea1t d\u1ebb l\u00e0 lo\u1ea1i th\u1ef1c ph\u1ea9m c\u00f3 gi\u00e1 tr\u1ecb. Tuy nhi\u00ean, nh\u1eefng nghi\u00ean c\u1ee9u v\u1ec1 d\u1ebb \u0103n h\u1ea1t \u1edf \u0111\u00e2y c\u00f2n r\u1ea5t \u00edt, ch\u1ee7 y\u1ebfu m\u1edbi d\u1eebng l\u1ea1i \u1edf vi\u1ec7c m\u00f4 t\u1ea3 \u0111\u1eb7c \u0111i\u1ec3m h\u00ecnh th\u00e1i v\u00e0 ph\u00e2n b\u1ed1, c\u00f2n thi\u1ebfu c\u01a1 s\u1edf khoa h\u1ecdc cho vi\u1ec7c x\u00e2y d\u1ef1ng h\u01b0\u1edbng d\u1eabn k\u1ef9 thu\u1eadt g\u00e2y tr\u1ed3ng v\u00e0 ph\u00e1t tri\u1ec3n. Xu\u1ea5t ph\u00e1t t\u1eeb th\u1ef1c ti\u1ec5n \u0111\u00f3, nghi\u00ean c\u1ee9u \u0111\u1eb7c \u0111i\u1ec3m l\u00e2m h\u1ecdc v\u00e0 \u0111\u1ec1 xu\u1ea5t bi\u1ec7n ph\u00e1p k\u1ef9 thu\u1eadt nu\u00f4i d\u01b0\u1ee1ng, x\u00fac ti\u1ebfn t\u00e1i sinh v\u00e0 g\u00e2y tr\u1ed3ng r\u1eebng d\u1ebb \u0103n h\u1ea1t \u1edf T\u00e2y Nguy\u00ean \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n nh\u1eb1m g\u00f3p ph\u1ea7n b\u1ed5 sung v\u00e0 ho\u00e0n thi\u1ec7n th\u00eam nh\u1eefng c\u01a1 s\u1edf khoa h\u1ecdc, x\u00e2y d\u1ef1ng h\u01b0\u1edbng d\u1eabn k\u1ef9 thu\u1eadt tr\u1ed3ng, nu\u00f4i d\u01b0\u1ee1ng, x\u00fac ti\u1ebfn t\u00e1i sinh r\u1eebng d\u1ebb \u0103n h\u1ea1t l\u00e0 r\u1ea5t c\u1ea7n thi\u1ebft.<\/p>\n

(ii) N\u1ed9i dung v\u00e0 ph\u01b0\u01a1ng ph\u00e1p nghi\u00ean c\u1ee9u<\/b><\/p>\n

2.1. N\u1ed9i dung nghi\u00ean c\u1ee9u<\/i><\/b><\/i><\/b><\/p>\n

– Nghi\u00ean c\u1ee9u m\u1ed9t s\u1ed1 \u0111\u1eb7c \u0111i\u1ec3m h\u00ecnh th\u00e1i, sinh th\u00e1i c\u1ee7a c\u00e1c lo\u00e0i d\u1ebb \u0103n h\u1ea1t<\/p>\n

– Nghi\u00ean c\u1ee9u \u0111\u1eb7c \u0111i\u1ec3m l\u00e2m h\u1ecdc c\u1ee7a D\u1ebb anh v\u00e0 Kha th\u1ee5 nguy\u00ean<\/p>\n

– Nghi\u00ean c\u1ee9u bi\u1ec7n ph\u00e1p k\u1ef9 thu\u1eadt nu\u00f4i d\u01b0\u1ee1ng v\u00e0 x\u00fac ti\u1ebfn t\u00e1i sinh r\u1eebng D\u1ebb anh v\u00e0 Kha th\u1ee5 nguy\u00ean t\u1ea1i T\u00e2y Nguy\u00ean<\/p>\n

– Nghi\u00ean c\u1ee9u bi\u1ec7n ph\u00e1p k\u1ef9 thu\u1eadt g\u00e2y tr\u1ed3ng r\u1eebng d\u1ebb \u0103n h\u1ea1t<\/p>\n

– Th\u1eed nghi\u1ec7m tr\u1ed3ng m\u1ed9t s\u1ed1 lo\u1ea1i d\u1ebb \u0103n h\u1ea1t kh\u00e1c t\u1ea1i T\u00e2y Nguy\u00ean<\/p>\n

2.2. Ph\u01b0\u01a1ng ph\u00e1p nghi\u00ean c\u1ee9u<\/i><\/b><\/i><\/b><\/p>\n

2.2.1. PP nghi\u00ean c\u1ee9u m\u1ed9t s\u1ed1 \u0111\u1eb7c \u0111i\u1ec3m h\u00ecnh th\u00e1i, sinh th\u00e1i c\u1ee7a c\u00e1c lo\u00e0i d\u1ebb \u0103n h\u1ea1t: K\u1ebf th\u1eeba c\u00e1c t\u00e0i li\u1ec7u nghi\u00ean c\u1ee9u \u0111\u00e3 c\u00f3, k\u1ebft h\u1ee3p thu th\u1eadp m\u1eabu ngo\u00e0i hi\u1ec7n tr\u01b0\u1eddng \u0111\u1ec3 gi\u00e1m \u0111\u1ecbnh ti\u00eau b\u1ea3n v\u00e0 ti\u1ebfn h\u00e0nh m\u00f4 t\u1ea3, ch\u1ee5p \u1ea3nh h\u00ecnh th\u00e1i, k\u00edch th\u01b0\u1edbc l\u00e1, hoa, qu\u1ea3, h\u1ea1t c\u00e1c lo\u00e0i d\u1ebb \u0103n h\u1ea1t c\u00f3 ph\u00e2n b\u1ed1 t\u1ef1 nhi\u00ean trong v\u00f9ng \u0111\u1ed3ng th\u1eddi x\u00e1c \u0111\u1ecbnh v\u00f9ng ph\u00e2n b\u1ed1 v\u00e0 \u0111\u1eb7c \u0111i\u1ec3m sinh th\u00e1i, kh\u00ed h\u1eadu, \u0111\u1ea5t \u0111ai c\u1ee7a c\u00e1c lo\u00e0i d\u1ebb \u0103n h\u1ea1t.<\/p>\n

2.2.2. Ph\u01b0\u01a1ng ph\u00e1p nghi\u00ean c\u1ee9u \u0111\u1eb7c \u0111i\u1ec3m l\u00e2m h\u1ecdc c\u1ee7a D\u1ebb anh v\u00e0 Kha th\u1ee5 nguy\u00ean<\/p>\n

– PP nghi\u00ean c\u1ee9u m\u1ed9t s\u1ed1 \u0111\u1eb7c \u0111i\u1ec3m c\u1ea5u tr\u00fac l\u00e2m ph\u1ea7n D\u1ebb anh v\u00e0 Kha th\u1ee5 nguy\u00ean<\/i><\/p>\n

Tr\u00ean m\u1ed7i \u0111ai cao, ch\u1ecdn v\u00e0 l\u1eadp 3 \u00d4TC \u0111i\u1ec3n h\u00ecnh t\u1ea1m th\u1eddi tr\u00ean c\u00e1c l\u00e2m ph\u1ea7n c\u00f3 D\u1ebb anh v\u00e0 Kha th\u1ee5 nguy\u00ean ph\u00e2n b\u1ed1, di\u1ec7n t\u00edch m\u1ed7i \u00d4TC s\u01a1 c\u1ea5p l\u00e0 2.500 m2<\/sup> (50m x 50m). Trong m\u1ed7i \u00d4TC s\u01a1 c\u1ea5p chia th\u00e0nh m\u1ea1ng l\u01b0\u1edbi 25 \u00f4 th\u1ee9 c\u1ea5p, di\u1ec7n t\u00edch m\u1ed7i \u00f4 th\u1ee9 c\u1ea5p l\u00e0 100 m2<\/sup> (10 m x 10 m). Trong m\u1ed7i \u00f4 th\u1ee9 c\u1ea5p x\u00e1c \u0111\u1ecbnh t\u00ean c\u00e1c lo\u00e0i c\u00e2y v\u00e0 \u0111o \u0111\u1ebfm to\u00e0n b\u1ed9 s\u1ed1 c\u00e2y g\u1ed7 c\u00f3 D1.3<\/sub> \u2265 6 cm theo c\u00e1c ch\u1ec9 ti\u00eau nh\u01b0: D1.3<\/sub>; Hvn<\/sub>; Hdc<\/sub>; Dt<\/sub>.<\/p>\n

+ PP x\u00e1c \u0111\u1ecbnh t\u1ed5 th\u00e0nh lo\u00e0i c\u00e2y g\u1ed7 \u01b0u th\u1ebf: <\/i>T\u1ed5 th\u00e0nh lo\u00e0i \u0111\u01b0\u1ee3c t\u00ednh theo ph\u01b0\u01a1ng ph\u00e1p c\u1ee7a Curtis Mc. Intosh (1951) .<\/p>\n

Tr\u1ecb s\u1ed1 IV \u0111\u01b0\u1ee3c t\u00ednh theo c\u00f4ng th\u1ee9c (2.1)<\/p>\n

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

Trong \u0111\u00f3: Z l\u00e0 s\u1ea3n l\u01b0\u1ee3ng h\u1ea1t gi\u1ed1ng tr\u00ean 1 ha (kg\/ha); N: s\u1ed1 c\u00e2y tr\u00ean ha; B: t\u1ed5ng s\u1ed1 qu\u1ea3 c\u1ee7a 5 c\u00e2y ti\u00eau chu\u1ea9n; C: s\u1ed1 h\u1ea1t b\u00ecnh qu\u00e2n 1 qu\u1ea3; F: \u0110\u1ed9 thu\u1ea7n c\u1ee7a h\u1ea1t; P Kh\u1ed1i l\u01b0\u1ee3ng 1000 h\u1ea1t (gr)<\/p>\n

+ Thi\u1ebft l\u1eadp quan h\u1ec7<\/i>: \u00c1p d\u1ee5ng ph\u01b0\u01a1ng ph\u00e1p ph\u00e2n t\u00edch th\u1ed1ng k\u00ea trong l\u00e2m nghi\u1ec7p v\u1edbi s\u1ef1 tr\u1ee3 gi\u00fap c\u1ee7a c\u00e1c ph\u1ea7n m\u1ec1m chuy\u00ean d\u1ee5ng nh\u01b0 SPSS 13.0 v\u00e0 Excel tr\u00ean m\u00e1y vi t\u00ednh \u0111\u1ec3 m\u00f4 ph\u1ecfng m\u1ed1i quan h\u1ec7 gi\u1eefa n\u0103ng su\u1ea5t h\u1ea1t v\u1edbi c\u00e1c ch\u1ec9 ti\u00eau sinh tr\u01b0\u1edfng.<\/p>\n

– PP nghi\u00ean c\u1ee9u \u0111\u1eb7c \u0111i\u1ec3m t\u00e1i sinh t\u1ef1 nhi\u00ean lo\u00e0i D\u1ebb anh v\u00e0 Kha th\u1ee5 nguy\u00ean <\/i><\/p>\n

Trong m\u1ed7i \u00d4TC thi\u1ebft l\u1eadp 30 \u00f4 d\u1ea1ng b\u1ea3n (\u00d4DB) di\u1ec7n t\u00edch 4 m2<\/sup> (2 m x 2 m). \u0110o \u0111\u1ebfm c\u00e1c c\u00e2y g\u1ed7 t\u00e1i sinh c\u00f3 D1.3<\/sub> \u2264 6cm. C\u00e1c ch\u1ec9 ti\u00eau x\u00e1c \u0111\u1ecbnh: Lo\u00e0i c\u00e2y, Hvn<\/sub>, ph\u1ea9m ch\u1ea5t c\u00e2y, ngu\u1ed3n g\u1ed1c c\u00e2y t\u00e1i sinh. M\u1eadt \u0111\u1ed9 t\u00e1i sinh; <\/i>Ph\u00e2n b\u1ed1 s\u1ed1 c\u00e2y t\u00e1i sinh theo chi\u1ec1u cao v\u00e0 <\/i>Ch\u1ea5t l\u01b0\u1ee3ng c\u00e2y t\u00e1i sinh v\u00e0 ngu\u1ed3n g\u1ed1c t\u00e1i sinh \u0111\u01b0\u1ee3c t\u00ednh theo c\u00f4ng th\u1ee9c: <\/i>\u00a0\u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Trong \u0111\u00f3: ni<\/sub>: l\u00e0 s\u1ed1 c\u00e2y trong \u00d4DB<\/p>\n

2.2.3. PP nghi\u00ean c\u1ee9u bi\u1ec7n ph\u00e1p k\u1ef9 thu\u1eadt nu\u00f4i d\u01b0\u1ee1ng v\u00e0 x\u00fac ti\u1ebfn t\u00e1i sinh<\/p>\n

– PP nghi\u00ean c\u1ee9u k\u1ef9 thu\u1eadt<\/i> nu\u00f4i d\u01b0\u1ee1ng<\/i> <\/i>r\u1eebng D\u1ebb anh v\u00e0 Kha th\u1ee5 nguy\u00ean<\/i>: <\/i><\/b>Th\u00ed nghi\u1ec7m b\u1ed1 tr\u00ed v\u1edbi 2 nh\u00e2n t\u1ed1: Bi\u1ec7n ph\u00e1p k\u1ef9 thu\u1eadt (T\u00e1c \u0111\u1ed9ng cao, b\u00f3n ph\u00e2n; T\u00e1c \u0111\u1ed9ng th\u1ea5p; \u0110\u1ed1i ch\u1ee9ng) v\u00e0 \u0111\u1ed9 t\u00e0n che (0,35 – 0,4; 0,5 – 0,6 v\u00e0 \u0111\u1ed1i ch\u1ee9ng). M\u1ed7i CT l\u1eb7p l\u1ea1i 3 l\u1ea7n.<\/p>\n

– PP nghi\u00ean c\u1ee9u k\u1ef9 thu\u1eadt <\/i>x\u00fac ti\u1ebfn t\u00e1i sinh <\/i>r\u1eebng <\/i>D\u1ebb <\/i>anh<\/i>: Th\u00ed nghi\u1ec7m b\u1ed1 tr\u00ed 2 nh\u00e2n t\u1ed1: (i) Bi\u1ec7n ph\u00e1p k\u1ef9 thu\u1eadt (X\u00fac ti\u1ebfn t\u00e1i sinh t\u1ef1 nhi\u00ean; Ch\u0103m s\u00f3c c\u00e2y t\u00e1i sinh; Kh\u00f4ng t\u00e1c \u0111\u1ed9ng) v\u00e0 (ii) \u0111\u1ed9 t\u00e0n che (0,35 – 0,4; 0,5 – 0,6 v\u00e0 \u0111\u1ed1i ch\u1ee9ng). M\u1ed7i CT l\u1eb7p l\u1ea1i 3 l\u1ea7n<\/p>\n

2<\/i>.<\/i>2.4<\/i>. <\/i>Ph\u01b0\u01a1ng ph\u00e1p <\/i>nghi\u00ean c\u1ee9u bi\u1ec7n ph\u00e1p k\u1ef9 thu\u1eadt g\u00e2y tr\u1ed3ng D\u1ebb <\/i>\u0103n h\u1ea1t<\/i><\/i><\/p>\n

– Ph\u01b0\u01a1ng ph\u00e1p n<\/i>ghi\u00ean c\u1ee9u nh\u00e2n gi\u1ed1ng sinh d\u01b0\u1ee1ng<\/i> D\u1ebb anh v\u00e0 Kha th\u1ee5 nguy\u00ean<\/i><\/p>\n

* PP nghi\u00ean c\u1ee9u <\/i>k\u1ef9 thu\u1eadt <\/i>gi\u00e2m hom c\u00e0nh: B\u1ed1 tr\u00ed th\u1eed nghi\u1ec7m 2 lo\u1ea1i hom (hom non v\u00e0 hom b\u00e1nh t\u1ebb), v\u1edbi 2 lo\u1ea1i thu\u1ed1c (IBA v\u00e0 IAA) v\u1edbi 3 n\u1ed3ng \u0111\u1ed9 (500 ppm, 1.000 ppm v\u00e0 1.500 ppm.<\/p>\n

* Ph\u01b0\u01a1ng ph\u00e1p nghi\u00ean c\u1ee9u k\u1ef9 thu\u1eadt <\/i>gh\u00e9p: 3 ph\u01b0\u01a1ng ph\u00e1p (gh\u00e9p n\u00eam, gh\u00e9p \u00e1p v\u00e0 gh\u00e9p m\u1eaft).<\/p>\n

– PP nghi\u00ean c\u1ee9u<\/i> ph\u01b0\u01a1ng th\u1ee9c <\/i>tr\u1ed3ng<\/i> (Thu\u1ea7n lo\u00e0i, h\u1ed7n giao v\u1edbi Keo TT v\u00e0 h\u1ed7n giao b\u1ea3n \u0111\u1ecba) v\u00e0 m\u1eadt \u0111\u1ed9 tr\u1ed3ng<\/i> (830; 1.100 v\u00e0 1.660 c\u00e2y\/ha).<\/p>\n

2.2.5. Ph\u01b0\u01a1ng ph\u00e1p th\u1eed nghi\u1ec7m tr\u1ed3ng 3 lo\u00e0i (D\u1ebb y\u00ean th\u1ebf, D\u1ebb tr\u00f9ng kh\u00e1nh v\u00e0 D\u1ebb trung qu\u1ed1c), tr\u1ed3ng thu\u1ea7n lo\u00e0i v\u1edbi m\u1eadt \u0111\u1ed9 1.100 c\u00e2y\/ha, m\u1ed7i c\u00e2y b\u00f3n l\u00f3t 0,5 kg h\u1eefu c\u01a1 vi sinh + 0,05 kg NPK. M\u1ed7i lo\u00e0i tr\u1ed3ng v\u1edbi di\u1ec7n t\u00edch 0,5 ha, \u0111\u01b0\u1ee3c chia \u0111\u1ec1u cho 3 l\u1ea7n l\u1eb7p l\u1ea1i. <\/i><\/p>\n

Ph\u01b0\u01a1ng ph\u00e1p x\u1eed l\u00fd s\u1ed1 li\u1ec7u<\/i><\/b>: \u1ee8ng d\u1ee5ng ph\u01b0\u01a1ng ph\u00e1p th\u1ed1ng k\u00ea to\u00e1n h\u1ecdc trong l\u00e2m nghi\u1ec7p \u0111\u1ec3 x\u1eed l\u00fd, ph\u00e2n t\u00edch s\u1ed1 li\u1ec7u v\u1edbi s\u1ef1 tr\u1ee3 gi\u00fap c\u1ee7a ph\u1ea7n m\u1ec1m SPSS, Excel tr\u00ean m\u00e1y vi t\u00ednh (Nguy\u1ec5n H\u1ea3i Tu\u1ea5t v\u00e0 cs, 2006) v\u00e0 (Nguy\u1ec5n H\u1ea3i Tu\u1ea5t, Nguy\u1ec5n Tr\u1ecdng B\u00ecnh, 2005)<\/p>\n

(iii). K\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u v\u00e0 th\u1ea3o lu\u1eadn<\/b><\/p>\n

3.1. K\u1ebft qu\u1ea3 NC \u0111\u1eb7c \u0111i\u1ec3m h\u00ecnh th\u00e1i, sinh th\u00e1i c\u1ee7a c\u00e1c lo\u00e0i d\u1ebb \u0103n h\u1ea1t \u1edf T\u00e2y Nguy\u00ean<\/i><\/i><\/p>\n

3.1.1. K\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u \u0111\u1eb7c \u0111i\u1ec3m h\u00ecnh th\u00e1i c\u00e1c lo\u00e0i d\u1ebb \u0103n h\u1ea1t<\/p>\n

K\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u ph\u00e2n lo\u1ea1i cho th\u1ea5y, t\u1ea1i v\u00f9ng T\u00e2y Nguy\u00ean c\u00f3 ph\u00e2n b\u1ed1 11 lo\u00e0i d\u1ebb c\u00f3 kh\u1ea3 n\u0103ng cho h\u1ea1t \u0103n \u0111\u01b0\u1ee3c thu\u1ed9c 2 chi, trong \u0111\u00f3 c\u00f3 ch\u1ee7 y\u1ebfu thu\u1ed9c chi Castanopsis<\/i> (9\/11 lo\u00e0i) v\u00e0 chi Lithocarpus<\/i> (2\/11 lo\u00e0i).<\/p>\n

3.1.2. K\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u \u0111\u1eb7c \u0111i\u1ec3m ph\u00e2n b\u1ed1 v\u00e0 sinh th\u00e1i c\u00e1c lo\u00e0i d\u1ebb \u0103n h\u1ea1t<\/p>\n

Trong 11 lo\u00e0i d\u1ebb \u0103n h\u1ea1t ph\u00e2n b\u1ed1 \u1edf T\u00e2y Nguy\u00ean c\u00f3 2 lo\u00e0i v\u1edbi bi\u00ean \u0111\u1ed9 sinh th\u00e1i kh\u00e1 r\u1ed9ng l\u00e0 D\u1ebb anh v\u00e0 Kha th\u1ee5 nguy\u00ean, 5 lo\u00e0i c\u00f3 bi\u00ean \u0111\u1ed9 sinh th\u00e1i v\u1eeba v\u00e0 1 lo\u00e0i c\u00f3 bi\u00ean \u0111\u1ed9 h\u1eb9p.<\/p>\n

Ph\u1ea7n l\u1edbn c\u00e1c lo\u00e0i d\u1ebb \u0103n h\u1ea1t tr\u00ean (8\/11 lo\u00e0i \u00bb 72,7%) th\u01b0\u1eddng ch\u1ec9 xu\u1ea5t hi\u1ec7n trong ki\u1ec3u r\u1eebng l\u00e1 r\u1ed9ng th\u01b0\u1eddng xanh nh\u01b0 Kha th\u1ee5 nguy\u00ean, Kha th\u1ee5 chevalier, Kha th\u1ee5 nhi\u1ebfm, D\u1ebb gai \u1ea5n \u0111\u1ed9, C\u00e0 \u1ed5i v\u1ecdng phu, Kha th\u1ee5 gunier, D\u1ebb s\u1eebng nai v\u00e0 D\u1ebb \u0111\u00e1. V\u1edbi 3 lo\u00e0i nh\u01b0 D\u1ebb anh, C\u00e0 \u1ed5i trung hoa v\u00e0 S\u1ed3i \u0111\u1ecf th\u00ec xu\u1ea5t hi\u1ec7n trong 2 ki\u1ec3u r\u1eebng l\u00e0 r\u1eebng l\u00e1 r\u1ed9ng th\u01b0\u1eddng xanh v\u00e0 r\u1eebng b\u00e1n th\u01b0\u1eddng xanh c\u00e2y l\u00e1 r\u1ed9ng xen c\u00e2y l\u00e1 kim. D\u1ebb anh v\u00e0 Kha th\u1ee5 nguy\u00ean ph\u00e2n b\u1ed1 \u1edf 2 nh\u00f3m \u0111\u1ea5t: \u0111\u1ea5t x\u00e1m v\u00e0 \u0111\u1ea5t \u0111\u1ecf bazan.<\/p>\n

3.2. K\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u \u0111\u1eb7c \u0111i\u1ec3m l\u00e2m h\u1ecdc c\u1ee7a D\u1ebb anh v\u00e0 Kha th\u1ee5 nguy\u00ean<\/p>\n

3.2.1. K\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u m\u1ed9t s\u1ed1 \u0111\u1eb7c \u0111i\u1ec3m c\u1ea5u tr\u00fac l\u00e2m ph\u1ea7n<\/p>\n

– K\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u c\u1ea5u tr\u00fac m\u1eadt \u0111\u1ed9 v\u00e0 t\u1ed5 th\u00e0nh t\u1ea7ng c\u00e2y cao: M\u1eadt \u0111\u1ed9 D\u1ebb anh c\u00f3 xu h\u01b0\u1edbng t\u0103ng d\u1ea7n t\u1eeb 44 c\u00e2y\/ha \u0111\u1ebfn 156 c\u00e2y\/ha \u1edf \u0111\u1ed9 cao < 1.000 m, c\u00e0ng l\u00ean cao c\u00e0ng gi\u1ea3m (\u1edf \u0111\u1ed9 cao > 1.500 m c\u00f2n 24 c\u00e2y\/ha). Ch\u1ec9 s\u1ed1 IV% c\u1ee7a D\u1ebb anh cao nh\u1ea5t \u1edf Sa Th\u1ea7y – Kon Tum (30,9%). M\u1eadt \u0111\u1ed9 Kha th\u1ee5 nguy\u00ean dao \u0111\u1ed9ng r\u1ea5t l\u1edbn (8 – 180 c\u00e2y\/ha). K\u1ebft qu\u1ea3 ph\u00e2n t\u00edch tr\u00ean cho th\u1ea5y n\u01a1i D\u1ebb anh v\u00e0 Kha th\u1ee5 nguy\u00ean c\u00f3 m\u1eadt \u0111\u1ed9 cao th\u00ec l\u1ef1a ch\u1ecdn nh\u1eefng c\u00e2y sinh tr\u01b0\u1edfng, ph\u00e1t tri\u1ec3n t\u1ed1t \u0111\u1ec3 chuy\u1ec3n ho\u00e1 th\u00e0nh r\u1eebng d\u1ebb cung c\u1ea5p h\u1ea1t, n\u01a1i ph\u00e2n b\u1ed1 v\u1edbi m\u1eadt \u0111\u1ed9 th\u1ea5p n\u00ean gi\u1eef l\u1ea1i t\u1ea5t c\u1ea3 c\u00e1c c\u00e2y D\u1ebb anh v\u00e0 Kha th\u1ee5 nguy\u00ean. C\u1ea7n t\u00e1c \u0111\u1ed9ng c\u00e1c bi\u1ec7n ph\u00e1p k\u1ef9 thu\u1eadt nh\u01b0 ch\u0103m s\u00f3c, b\u00f3n ph\u00e2n, t\u1ec9a c\u00e0nh, t\u1ea1o t\u00e1n, \u0111\u1ed3ng th\u1eddi ken ch\u1ebft c\u00e2y phi m\u1ee5c \u0111\u00edch, c\u00e2y c\u1ea1nh tranh v\u1edbi c\u00e2y m\u1ee5c \u0111\u00edch \u0111\u1ec3 r\u1eebng d\u1ebb c\u00f3 s\u1ea3n l\u01b0\u1ee3ng h\u1ea1t cao nh\u1ea5t.<\/p>\n

– \u00a0K\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u c\u1ea5u tr\u00fac n\/D1.3<\/sub> c\u1ee7a D\u1ebb anh v\u00e0 Kha th\u1ee5 nguy\u00ean: C\u1ea5u tr\u00fac n\/D1,3<\/sub> \u1edf r\u1eebng t\u1ef1 nhi\u00ean c\u00f3 lo\u00e0i D\u1ebb anh v\u00e0 Kha th\u1ee5 nguy\u00ean ph\u00e2n b\u1ed1 t\u1ea1i T\u00e2y Nguy\u00ean ch\u1ee7 y\u1ebfu tu\u00e2n theo d\u1ea1ng h\u00e0m Weibull (70%) v\u00e0 ph\u00e2n b\u1ed1 kho\u1ea3ng c\u00e1ch (30%). \u0110\u1ed1i v\u1edbi h\u00e0m Weibull, tham s\u1ed1 \u03b1 < 3, ngh\u0129a l\u00e0 c\u00e1c ph\u00e2n b\u1ed1 \u0111\u1ec1u c\u00f3 d\u1ea1ng l\u1ec7ch tr\u00e1i, v\u1edbi h\u00e0m kho\u1ea3ng \u1edf d\u1ea1ng 1 \u0111\u1ec9nh l\u1ec7ch tr\u00e1i, \u0111i\u1ec1u n\u00e0y ch\u1ee9ng t\u1ecf h\u1ea7u h\u1ebft c\u00e1c c\u00e2y trong l\u00e2m ph\u1ea7n t\u1eadp chung \u1edf c\u1ea5p \u0111\u01b0\u1eddng k\u00ednh th\u1ea5p (D1.3 <\/sub>< 32cm).<\/p>\n

– \u00a0K\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u c\u1ea5u tr\u00fac n\/Hvn<\/sub> l\u00e2m ph\u1ea7n D\u1ebb anh v\u00e0 Kha th\u1ee5 nguy\u00ean<\/p>\n

T\u01b0\u01a1ng t\u1ef1 nh\u01b0 ph\u00e2n b\u1ed1 s\u1ed1 c\u00e2y theo c\u1ea5p \u0111\u01b0\u1eddng k\u00ednh, ph\u00e2n b\u1ed1 n\/Hvn<\/sub> ch\u1ee7 y\u1ebfu ph\u00f9 h\u1ee3p v\u1edbi ph\u00e2n b\u1ed1 Weibull \u1edf d\u1ea1ng l\u1ec7ch tr\u00e1i (tham s\u1ed1 \u03b1 < 3). Chi\u1ec1u cao c\u00e1c c\u00e2y trong l\u00e2m ph\u1ea7n th\u1ea5p, ph\u00f9 h\u1ee3p v\u1edbi ph\u00e2n b\u1ed1 n\/D1.3<\/sub>. C\u00e1c c\u00e2y c\u00f3 k\u00edch th\u01b0\u1edbc l\u1edbn \u0111\u00e3 b\u1ecb khai th\u00e1c, ch\u1ee7 y\u1ebfu l\u00e0 c\u00e1c c\u00e2y c\u00f3 gi\u00e1 tr\u1ecb kinh t\u1ebf, c\u00e2y c\u00f2n l\u1ea1i ch\u1ee7 y\u1ebfu l\u00e0 c\u00e2y g\u1ed7 \u00edt gi\u00e1 tr\u1ecb, k\u00edch th\u01b0\u1edbc nh\u1ecf. V\u00ec v\u1eady, v\u1edbi l\u00e2m ph\u1ea7n c\u00f3 m\u1eadt \u0111\u1ed9 c\u00e2y D\u1ebb anh v\u00e0 Kha th\u1ee5 nguy\u00ean \u1edf t\u1ea7ng c\u00e2y cao (> 200 c\u00e2y\/ha) c\u1ea7n \u0111\u01b0\u1ee3c nu\u00f4i d\u01b0\u1ee1ng v\u00e0 kinh doanh theo h\u01b0\u1edbng l\u1ea5y qu\u1ea3 b\u1eb1ng c\u00e1ch t\u00e1c \u0111\u1ed9ng c\u00e1c bi\u1ec7n ph\u00e1p k\u1ef9 thu\u1eadt nh\u01b0 ph\u00e1t d\u00e2y leo, c\u00e2y b\u1ee5i, ken t\u1ec9a c\u00e2y phi m\u1ee5c \u0111\u00edch, \u0111i\u1ec1u ch\u1ec9nh kh\u00f4ng gian dinh d\u01b0\u1ee1ng h\u1ee3p l\u00fd nh\u1eb1m n\u00e2ng cao n\u0103ng su\u1ea5t h\u1ea1t.<\/p>\n

– \u00a0Quan h\u1ec7 D\u1ebb anh v\u00e0 Kha th\u1ee5 nguy\u00ean v\u1edbi c\u00e1c lo\u00e0i \u01b0u th\u1ebf trong qu\u1ea7n x\u00e3<\/i><\/i><\/p>\n

D\u1ebb anh c\u00f3 quan h\u1ec7 theo chi\u1ec1u h\u01b0\u1edbng t\u00edch c\u1ef1c, h\u1ed7 tr\u1ee3 nhau v\u1edbi 12 lo\u00e0i nh\u01b0: Ch\u00f2 x\u00f3t, S\u1ed3i braian, Ch\u00e2n chim, ng\u01b0\u1ee3c l\u1ea1i c\u00f3 quan h\u1ec7 c\u1ea1nh tranh v\u1edbi 3 lo\u00e0i H\u1eadu ph\u00e1t, Sung r\u1eebng v\u00e0 S\u00f2i t\u00eda. Kha th\u1ee5 nguy\u00ean c\u00f3 quan h\u1ec7 c\u1ea1nh tranh t\u01b0\u01a1ng t\u00e1c v\u1edbi S\u00f2i t\u00eda, Ch\u00e2n chim v\u00e0 Ch\u00f2 x\u00f3t v\u00e0 quan h\u1ec7 ng\u1eabu nhi\u00ean v\u1edbi Khuya \u00e1o, B\u1eddi l\u1eddi v\u00e0 D\u1ebb c\u1ecdng m\u1ea3nh. V\u00ec v\u1eady, \u0111\u00e2y l\u00e0 c\u01a1 s\u1edf quan tr\u1ecdng b\u01b0\u1edbc \u0111\u1ea7u \u0111\u1ec1 xu\u1ea5t v\u00e0 l\u1ef1a ch\u1ecdn lo\u00e0i c\u00e2y tr\u1ed3ng h\u1ed7n giao ph\u00f9 h\u1ee3p.<\/p>\n

– \u00a0<\/i>M\u1ed1i quan h\u1ec7 gi\u1eefa n\u0103ng su\u1ea5t qu\u1ea3 v\u1edbi c\u00e1c ch\u1ec9 ti\u00eau sinh tr\u01b0\u1edfng D\u1ebb anh c\u00f3 d\u1ea1ng: .<\/i><\/p>\n

3.2.2. K\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u \u0111\u1eb7c \u0111i\u1ec3m t\u00e1i sinh t\u1ef1 nhi\u00ean D\u1ebb anh v\u00e0 Kha th\u1ee5 nguy\u00ean<\/p>\n

– K\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u m\u1eadt \u0111\u1ed9 c\u00e2y t\u00e1i sinh: M\u1eadt \u0111\u1ed9 D\u1ebb anh t\u00e1i sinh c\u00f3 s\u1ef1 dao \u0111\u1ed9ng l\u1edbn t\u1eeb 167 (\u0110\u00e0 L\u1ea1t) \u0111\u1ebfn 7.810 c\u00e2y\/ha (Sa Th\u1ea7y – Kon Tum) v\u1edbi Kha th\u1ee5 nguy\u00ean th\u00ec m\u1eadt \u0111\u1ed9 c\u00e2y t\u00e1i sinh kh\u00e1 \u0111\u1ed3ng \u0111\u1ec1u, dao \u0111\u1ed9ng t\u1eeb 667 – 2.000 c\u00e2y\/ha. T\u1ef7 l\u1ec7 s\u1ed1 c\u00e2y t\u00e1i sinh c\u00f3 tri\u1ec3n v\u1ecdng th\u1ea5p (< 37,5%).<\/p>\n

– K\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u ph\u00e2n b\u1ed1 s\u1ed1 c\u00e2y t\u00e1i sinh theo c\u1ea5p chi\u1ec1u cao: S\u1ed1 l\u01b0\u1ee3ng c\u00e2y t\u00e1i sinh D\u1ebb anh v\u00e0 Kha th\u1ee5 nguy\u00ean ch\u1ee7 y\u1ebfu t\u1eadp trung \u1edf c\u1ea5p chi\u1ec1u cao I (Hvn<\/sub> <\u00a0 0,5 m) v\u00e0 c\u00f3 xu h\u01b0\u1edbng gi\u1ea3m d\u1ea7n t\u1eeb c\u1ea5p I \u0111\u1ebfn c\u1ea5p VII. Ph\u00e2n b\u1ed1 n\/Hvn<\/sub> ph\u00f9 h\u1ee3p v\u1edbi ph\u00e2n b\u1ed1 gi\u1ea3m theo h\u00e0m Meyer. Tuy nhi\u00ean, m\u1ed9t s\u1ed1 \u0111i\u1ec3m ph\u00f9 h\u1ee3p ph\u00e2n b\u1ed1 kho\u1ea3ng c\u00e1ch v\u00e0 ph\u00e2n b\u1ed1 Weibull. Ph\u00e2n b\u1ed1 Weibull, a @ 1, ch\u1ee9ng t\u1ecf ph\u00e2n b\u1ed1 c\u00f3 d\u1ea1ng gi\u1ea3m. \u0110\u01b0\u1eddng cong ph\u00e2n b\u1ed1 gi\u1ea3m l\u00f5m v\u00e0 c\u00f3 xu h\u01b0\u1edbng b\u1eb9t d\u1ea7n (v\u00ec b@ 1). K\u1ebft qu\u1ea3 ki\u1ec3m tra cho th\u1ea5y c\u00e1c h\u00e0m ph\u00e2n b\u1ed1 \u0111\u01b0\u1ee3c ch\u1ecdn \u0111\u1ec3 m\u00f4 ph\u1ecfng c\u1ea5u tr\u00fac n\/Hvn \u0111\u1ec1u ph\u00f9 h\u1ee3p (c2<\/sup>t\u00ednh <\/sub>\u00a0< c2<\/sup>05<\/sub>).<\/p>\n

– \u00a0K\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u ngu\u1ed3n g\u1ed1c v\u00e0 ch\u1ea5t l\u01b0\u1ee3ng c\u00e2y t\u00e1i sinh: D\u1ebb anh t\u00e1i sinh \u1edf m\u1ee9c \u0111\u1ed9 t\u1eeb trung b\u00ecnh tr\u1edf l\u00ean chi\u1ebfm t\u1ef7 l\u1ec7 kh\u00e1 cao (> 81,9 %), v\u1edbi Kha th\u1ee5 nguy\u00ean c\u0169ng \u0111\u1ea1t > 62,5 %. T\u1ef7 l\u1ec7 c\u00e2y t\u00e1i sinh ch\u1ed3i v\u00e0 h\u1ea1t c\u1ee7a D\u1ebb anh c\u00f3 s\u1ef1 ch\u1ec7nh l\u1ec7ch kh\u00f4ng l\u1edbn. T\u1eeb k\u1ebft qu\u1ea3 ph\u00e2n t\u00edch cho th\u1ea5y, t\u1ef7 l\u1ec7 t\u00e1i sinh theo ngu\u1ed3n g\u1ed1c c\u1ee7a lo\u00e0i D\u1ebb anh v\u00e0 Kha th\u1ee5 nguy\u00ean kh\u00f4ng ch\u1ecbu \u1ea3nh h\u01b0\u1edfng nhi\u1ec1u b\u1edfi \u0111ai cao ho\u1eb7c \u0111\u1ed9 t\u00e0n che hay ki\u1ec3u r\u1eebng m\u00e0 n\u00f3 ch\u1ecbu s\u1ef1 chi ph\u1ed1i b\u1edfi \u0111\u1eb7c t\u00ednh sinh v\u1eadt h\u1ecdc c\u1ee7a lo\u00e0i c\u00e2y.<\/p>\n

T\u1eeb c\u00e1c k\u1ebft qu\u1ea3 ph\u00e2n t\u00edch tr\u00ean ta nh\u1eadn th\u1ea5y, c\u1ea7n t\u00e1c \u0111\u1ed9ng bi\u1ec7n ph\u00e1p k\u1ef9 thu\u1eadt l\u00e2m sinh nh\u01b0 x\u00fac ti\u1ebfn t\u00e1i sinh t\u1ef1 nhi\u00ean k\u1ebft h\u1ee3p tr\u1ed3ng b\u1ed5 sung v\u00e0o nh\u1eefng n\u01a1i c\u00f3 m\u1eadt \u0111\u1ed9 D\u1ebb anh v\u00e0 Kha th\u1ee5 nguy\u00ean t\u00e1i sinh th\u1ea5p. \u0110\u01a1n gi\u1ea3n h\u00f3a t\u1ed5 th\u00e0nh D\u1ebb anh v\u00e0 Kha th\u1ee5 nguy\u00ean ngay t\u1eeb giai \u0111o\u1ea1n c\u00e2y t\u00e1i sinh b\u1eb1ng c\u00e1ch lo\u1ea1i b\u1ecf nh\u1eefng lo\u00e0i \u00edt gi\u00e1 tr\u1ecb kinh t\u1ebf v\u00e0 c\u00f3 xu h\u01b0\u1edbng c\u1ea1nh tranh v\u1edbi D\u1ebb anh v\u00e0 Kha th\u1ee5 nguy\u00ean. \u0110\u1ed3ng th\u1eddi lu\u1ed7ng ph\u00e1t d\u00e2y leo, c\u00e2y b\u1ee5i, m\u1edf t\u00e1n t\u1ea1o di\u1ec7n t\u00edch dinh d\u01b0\u1ee1ng, k\u1ebft h\u1ee3p ch\u0103m s\u00f3c, b\u00f3n ph\u00e2n \u0111\u1ed1i v\u1edbi n\u01a1i c\u00f3 c\u01b0\u1eddng \u0111\u1ed9 kinh doanh cao \u0111\u1ec3 d\u1eabn r\u1eebng theo \u00fd mu\u1ed1n ph\u00f9 h\u1ee3p v\u1edbi m\u1ee5c \u0111\u00edch kinh doanh r\u1eebng theo h\u01b0\u1edbng l\u1ea5y qu\u1ea3.<\/p>\n

3.3. K\u1ebft qu\u1ea3 NC BPKT ND\u01b0\u1ee1ng v\u00e0 x\u00fac ti\u1ebfn t\u00e1i sinh r\u1eebng D\u1ebb anh v\u00e0 Kha th\u1ee5 nguy\u00ean<\/p>\n

3.3.1. K\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u k\u1ef9 thu\u1eadt nu\u00f4i d\u01b0\u1ee1ng r\u1eebng D\u1ebb anh v\u00e0 Kha th\u1ee5 nguy\u00ean<\/p>\n

N\u0103ng su\u1ea5t qu\u1ea3 v\u01b0\u1ee3t tr\u1ed9i \u1edf th\u00ed nghi\u1ec7m nu\u00f4i d\u01b0\u1ee1ng D\u1ebb anh t\u0103ng t\u1eeb 6,7 – 31,7 % so v\u1edbi tr\u01b0\u1edbc khi t\u00e1c \u0111\u1ed9ng. V\u1edbi th\u00ed nghi\u1ec7m Kha th\u1ee5 nguy\u00ean th\u00ec t\u1ef7 l\u1ec7 n\u00e0y dao \u0111\u1ed9ng 6,7 – 22,3 %. \u0110\u1ed9 t\u00e0n che kh\u00e1c nhau \u0111\u00e3 \u1ea3nh h\u01b0\u1edfng kh\u00e1c nhau \u0111\u1ebfn \u0111\u1ed9 v\u01b0\u1ee3t tr\u1ed9i v\u1ec1 n\u0103ng su\u1ea5t qu\u1ea3 d\u1ebb, cao nh\u1ea5t c\u00f3 th\u1ec3 l\u00ean t\u1edbi 31,7% \u1edf c\u00f4ng th\u1ee9c CT1\/TC1 \u0111\u1ed1i v\u1edbi lo\u00e0i D\u1ebb anh \u1edf Sa Th\u1ea7y – Kon Tum. \u0110\u1ed1i v\u1edbi Kha th\u1ee5 nguy\u00ean \u0111\u1ed9 v\u01b0\u1ee3t tr\u1ed9i cao nh\u1ea5t \u1edf c\u00f4ng th\u1ee9c CT1\/TC2 (22,3%). B\u00f3n ph\u00e2n ho\u1eb7c kh\u00f4ng b\u00f3n ph\u00e2n \u0111\u1ec1u ch\u01b0a c\u00f3 \u1ea3nh h\u01b0\u1edfng r\u00f5 r\u1ec7t \u0111\u1ebfn \u0111\u1ed9 v\u01b0\u1ee3t tr\u1ed9i v\u1ec1 n\u0103ng su\u1ea5t h\u1ea1t d\u1ebb. Tuy nhi\u00ean, c\u1ea7n \u00e1p d\u1ee5ng c\u00e1c bi\u1ec7n ph\u00e1p l\u00e2m sinh \u0111\u1ec3 \u0111i\u1ec1u ch\u1ec9nh kh\u00f4ng gian dinh d\u01b0\u1ee1ng, m\u1edf t\u00e1n v\u1edbi \u0111\u1ed9 t\u00e0n che 40-60% th\u00ec r\u1eebng d\u1ebb s\u1ebd cho n\u0103ng su\u1ea5t h\u1ea1t cao nh\u1ea5t.<\/p>\n

3.3.2. K\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u k\u1ef9 thu\u1eadt x\u00fac ti\u1ebfn t\u00e1i sinh t\u1ef1 nhi\u00ean r\u1eebng D\u1ebb anh<\/p>\n

T\u0103ng tr\u01b0\u1edfng th\u01b0\u1eddng xuy\u00ean \u0111\u1ecbnh k\u1ef3 v\u1ec1 D1.3<\/sub> cao nh\u1ea5t \u1edf c\u00f4ng th\u1ee9c CT2\/TC2 v\u1edbi ZD1.3<\/sub> \u0111\u1ea1t 1,63 cm. V\u1ec1 t\u0103ng tr\u01b0\u1edfng th\u01b0\u1eddng xuy\u00ean \u0111\u1ecbnh k\u1ef3 ZHvn<\/sub> cao nh\u1ea5t 1,94 m (CT2\/\u0110C). V\u1ec1 ZDt<\/sub> cao nh\u1ea5t \u0111\u1ea1t 1,05 m (CT2\/TC2). T\u1eeb k\u1ebft qu\u1ea3 tr\u00ean ta th\u1ea5y n\u1ebfu \u00e1p c\u00e1c bi\u1ec7n ph\u00e1p k\u1ef9 thu\u1eadt x\u00fac ti\u1ebfn t\u00e1i sinh th\u00ec l\u01b0\u1ee3ng t\u0103ng tr\u01b0\u1edfng th\u01b0\u1eddng xuy\u00ean \u0111\u1ecbnh k\u1ef3 (sau 31 th\u00e1ng t\u00e1c \u0111\u1ed9ng) g\u1ea5p 1,3 – 1,6 l\u1ea7n so v\u1edbi \u0111\u1ed1i ch\u1ee9ng.<\/p>\n

3.4. K\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u k\u1ef9 thu\u1eadt g\u00e2y tr\u1ed3ng D\u1ebb anh v\u00e0 Kha th\u1ee5 nguy\u00ean<\/p>\n

3.4.3. K\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u k\u1ef9 thu\u1eadt nh\u00e2n gi\u1ed1ng sinh d\u01b0\u1ee1ng<\/p>\n

3.4.3.1. K\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u k\u1ef9 thu\u1eadt gi\u00e2m hom c\u00e0nh<\/p>\n

K\u1ebft qu\u1ea3 cho th\u1ea5y \u0111\u1ed1i v\u1edbi thu\u1ed1c IAA v\u00e0 thu\u1ed1c IBA n\u1ed3ng \u0111\u1ed9 1.500 ppm v\u00e0 c\u00f4ng th\u1ee9c \u0111\u1ed1i ch\u1ee9ng th\u00ec c\u1ea3 2 lo\u00e0i D\u1ebb anh v\u00e0 Kha th\u1ee5 nguy\u00ean kh\u00f4ng c\u00f3 kh\u1ea3 n\u0103ng ra r\u1ec5. Kha th\u1ee5 nguy\u00ean t\u1ef7 l\u1ec7 ra r\u1ec5 \u1edf c\u00e1c c\u00f4ng th\u1ee9c th\u00ed nghi\u1ec7m th\u1ea5p dao \u0111\u1ed9ng 15,6 – 28,1 % (sau 30 ng\u00e0y). D\u1ebb anh t\u1ef7 l\u1ec7 ra r\u1ec5 gi\u1ea3m d\u1ea7n xu\u1ed1ng 18,8 % (hom b\u00e1nh t\u1ebb, 500 ppm IBA) sau 60 ng\u00e0y.<\/p>\n

3.4.3.2. K\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u k\u1ef9 thu\u1eadt gh\u00e9p<\/p>\n

Kha th\u1ee5 nguy\u00ean ph\u01b0\u01a1ng ph\u00e1p gh\u00e9p n\u00eam cho t\u1ef7 l\u1ec7 s\u1ed1ng cao nh\u1ea5t \u0111\u1ea1t 66,7 %, gh\u00e9p \u00e1p c\u0169ng cho t\u1ef7 l\u1ec7 kh\u00e1 cao 57,5%, ph\u01b0\u01a1ng ph\u00e1p gh\u00e9p m\u1eaft cho t\u1ef7 l\u1ec7 th\u1ea5p nh\u1ea5t ch\u1ec9 \u0111\u1ea1t 6,7%. D\u1ebb anh t\u1ef7 l\u1ec7 s\u1ed1ng c\u1ee7a ph\u01b0\u01a1ng ph\u00e1p gh\u00e9p \u00e1p cao nh\u1ea5t l\u00e0 42,5%, ph\u01b0\u01a1ng ph\u00e1p gh\u00e9p n\u00eam c\u0169ng \u0111\u1ea1t t\u1ef7 l\u1ec7 32,5%, th\u1ea5p nh\u1ea5t l\u00e0 ph\u01b0\u01a1ng ph\u00e1p gh\u00e9p m\u1eaft ch\u1ec9 \u0111\u1ea1t 4,2%.<\/p>\n

K\u1ebft qu\u1ea3 ph\u00e2n t\u00edch ph\u01b0\u01a1ng sai m\u1ed9t nh\u00e2n t\u1ed1 ch\u1ec9 ra r\u1eb1ng D\u1ebb anh v\u00e0 Kha th\u1ee5 nguy\u00ean n\u00ean \u00e1p d\u1ee5ng ph\u01b0\u01a1ng ph\u00e1p gh\u00e9p n\u00eam ho\u1eb7c gh\u00e9p \u00e1p khi nh\u00e2n gi\u1ed1ng sinh d\u01b0\u1ee1ng.<\/p>\n

3.4.5. K\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u ph\u01b0\u01a1ng th\u1ee9c v\u00e0 m\u1eadt \u0111\u1ed9 tr\u1ed3ng<\/p>\n

3.3.5.1. K\u1ebft qu\u1ea3 NC \u1ea3nh h\u01b0\u1edfng c\u1ee7a ph\u01b0\u01a1ng th\u1ee9c v\u00e0 m\u1eadt \u0111\u1ed9 tr\u1ed3ng \u0111\u1ebfn sinh tr\u01b0\u1edfng D\u1ebb anh<\/p>\n

* T\u0103ng tr\u01b0\u1edfng D\u1ebb anh sau 39 th\u00e1ng tr\u1ed3ng t\u1ea1i \u0110am R\u00f4ng – L\u00e2m \u0110\u1ed3ng<\/p>\n

K\u1ebft qu\u1ea3 t\u00ednh to\u00e1n l\u01b0\u1ee3ng t\u0103ng tr\u01b0\u1edfng b\u00ecnh qu\u00e2n chung sau 39 th\u00e1ng tu\u1ed5i \u0111\u01b0\u1ee3c t\u1ed5ng h\u1ee3p t\u1ea1i b\u1ea3ng 3.3<\/p>\n

B\u1ea3ng 3.3. T\u0103ng tr\u01b0\u1edfng c\u1ee7a D\u1ebb anh t\u1ea1i \u0110am R\u00f4ng – L\u00e2m \u0110\u1ed3ng \u1edf tu\u1ed5i 3<\/p>\n\n\n\n\n\n\n\n
\n

Ph\u01b0\u01a1ng th\u1ee9c tr\u1ed3ng<\/p>\n<\/td>\n

\n

830 c\u00e2y\/ha<\/p>\n<\/td>\n

\n

1.100 c\u00e2y\/ha<\/p>\n<\/td>\n

\n

1.660 c\u00e2y\/ha<\/p>\n<\/td>\n<\/tr>\n

\n

DD1,3<\/sub><\/p>\n

(cm)<\/p>\n<\/td>\n

\n

DHvn<\/sub><\/p>\n

(m)<\/p>\n<\/td>\n

\n

DDt<\/sub><\/p>\n

(m)<\/p>\n<\/td>\n

\n

DD1,3<\/sub><\/p>\n

(cm)<\/p>\n<\/td>\n

\n

DHvn<\/sub><\/p>\n

(m)<\/p>\n<\/td>\n

\n

DDt<\/sub><\/p>\n

(m)<\/p>\n<\/td>\n

\n

DD1,3<\/sub><\/p>\n

(cm)<\/p>\n<\/td>\n

\n

DHvn<\/sub><\/p>\n

(m)<\/p>\n<\/td>\n

\n

DDt<\/sub><\/p>\n

(m)<\/p>\n<\/td>\n<\/tr>\n

D\u1ebb anh<\/td>\n\n

0,79<\/p>\n<\/td>\n

\n

1,00<\/b><\/p>\n<\/td>\n

\n

0,50<\/p>\n<\/td>\n

\n

0,67<\/p>\n<\/td>\n

\n

0,91<\/p>\n<\/td>\n

\n

0,48<\/p>\n<\/td>\n

\n

0,62<\/b><\/p>\n<\/td>\n

\n

0,91<\/b><\/p>\n<\/td>\n

\n

0,45<\/b><\/p>\n<\/td>\n<\/tr>\n

D\u1ebb anh xen Keo<\/td>\n\n

0,80<\/p>\n<\/td>\n

\n

0,99<\/p>\n<\/td>\n

\n

0,53<\/p>\n<\/td>\n

\n

0,75<\/p>\n<\/td>\n

\n

0,95<\/p>\n<\/td>\n

\n

0,52<\/p>\n<\/td>\n

\n

0,72<\/p>\n<\/td>\n

\n

0,92<\/p>\n<\/td>\n

\n

0,48<\/p>\n<\/td>\n<\/tr>\n

D\u1ebb anh xen B\u1eddi l\u1eddi<\/td>\n\n

0,81<\/b><\/p>\n<\/td>\n

\n

0,99<\/p>\n<\/td>\n

\n

0,57<\/b><\/p>\n<\/td>\n

\n

0,77<\/p>\n<\/td>\n

\n

0,97<\/p>\n<\/td>\n

\n

0,54<\/p>\n<\/td>\n

\n

0,70<\/p>\n<\/td>\n

\n

0,94<\/p>\n<\/td>\n

\n

0,52<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/b>T\u1eeb k\u1ebft qu\u1ea3 b\u1ea3ng 3.3 cho th\u1ea5y, t\u0103ng tr\u01b0\u1edfng b\u00ecnh qu\u00e2n chung v\u1ec1 D1.3<\/sub> cao nh\u1ea5t \u1edf ph\u01b0\u01a1ng th\u1ee9c tr\u1ed3ng D\u1ebb anh xen B\u1eddi l\u1eddi \u1edf m\u1eadt \u0111\u1ed9 830 c\u00e2y\/ha v\u00e0 th\u1ea5p nh\u1ea5t \u1edf ph\u01b0\u01a1ng th\u1ee9c tr\u1ed3ng D\u1ebb anh thu\u1ea7n lo\u00e0i v\u1edbi m\u1eadt \u0111\u1ed9 1.660 c\u00e2y\/ha. T\u0103ng tr\u01b0\u1edfng b\u00ecnh qu\u00e2n chung v\u1ec1 Dt<\/sub> cao nh\u1ea5t \u1edf ph\u01b0\u01a1ng th\u1ee9c h\u1ed7n giao xen B\u1eddi l\u1eddi v\u1edbi m\u1eadt \u0111\u1ed9 tr\u1ed3ng 830 c\u00e2y\/ha v\u00e0 th\u1ea5p nh\u1ea5t \u1edf ph\u01b0\u01a1ng th\u1ee9c tr\u1ed3ng thu\u1ea7n lo\u00e0i \u1edf m\u1eadt \u0111\u1ed9 tr\u1ed3ng 1,660 c\u00e2y\/ha. \u0110\u00e2y l\u00e0 c\u01a1 s\u1edf khoa h\u1ecdc g\u00f3p ph\u1ea7n \u0111\u1ec1 xu\u1ea5t ph\u01b0\u01a1ng th\u1ee9c v\u00e0 m\u1eadt \u0111\u1ed9 tr\u1ed3ng ph\u00f9 h\u1ee3p \u0111\u1ed1i v\u1edbi lo\u00e0i D\u1ebb anh t\u1ea1i T\u00e2y Nguy\u00ean.<\/p>\n

3.3.5.2. K\u1ebft qu\u1ea3 NC \u1ea3nh h\u01b0\u1edfng c\u1ee7a PT v\u00e0 m\u1eadt \u0111\u1ed9 tr\u1ed3ng \u0111\u1ebfn sinh tr\u01b0\u1edfng Kha th\u1ee5 nguy\u00ean<\/i><\/p>\n

* T\u0103ng tr\u01b0\u1edfng b\u00ecnh qu\u00e2n chung Kha th\u1ee5 nguy\u00ean t\u1ea1i \u0110am R\u00f4ng – L\u00e2m \u0110\u1ed3ng<\/p>\n

L\u01b0\u1ee3ng t\u0103ng tr\u01b0\u1edfng b\u00ecnh qu\u00e2n chung cao nh\u1ea5t v\u1edbi ph\u01b0\u01a1ng th\u1ee9c tr\u1ed3ng h\u1ed7n giao B\u1eddi l\u1eddi \u1edf m\u1eadt \u0111\u1ed9 830 c\u00e2y\/ha v\u00e0 th\u1ea5p nh\u1ea5t \u1edf ph\u01b0\u01a1ng th\u1ee9c tr\u1ed3ng thu\u1ea7n lo\u00e0i v\u1edbi m\u1eadt \u0111\u1ed9 1.660 c\u00e2y\/ha (B\u1ea3ng 3.4). K\u1ebft qu\u1ea3 ph\u00e2n t\u00edch ph\u01b0\u01a1ng sai ch\u01b0a c\u00f3 \u1ea3nh h\u01b0\u1edfng t\u01b0\u01a1ng t\u00e1c r\u00f5 r\u1ec7t gi\u1eefa nh\u00e2n t\u1ed1 m\u1eadt \u0111\u1ed9 v\u00e0 ph\u01b0\u01a1ng th\u1ee9c tr\u1ed3ng \u0111\u1ebfn l\u01b0\u1ee3ng t\u0103ng tr\u01b0\u1edfng b\u00ecnh qu\u00e2n chung v\u1ec1\u00a0 DD1.3<\/sub>, DHvn <\/sub>v\u00e0 DDt<\/sub> v\u1edbi m\u1ee9c \u00fd ngh\u0129a \u03b1 = 0,05. Ph\u01b0\u01a1ng th\u1ee9c tr\u1ed3ng h\u1ed7n giao Kha th\u1ee5 nguy\u00ean v\u1edbi B\u1eddi l\u1eddi ho\u1eb7c h\u1ed7n giao v\u1edbi Keo tai t\u01b0\u1ee3ng cho sinh tr\u01b0\u1edfng t\u1ed1t nh\u1ea5t, song ch\u01b0a c\u00f3 s\u1ef1 kh\u00e1c nhau r\u00f5 r\u1ec7t gi\u1eefa 2 ph\u01b0\u01a1ng th\u1ee9c n\u00e0y (Sig. > 0,05). M\u1eadt \u0111\u1ed9 tr\u1ed3ng 830 c\u00e2y\/ha c\u00f3 \u1ea3nh h\u01b0\u1edfng t\u1ed1t nh\u1ea5t v\u1ec1 DD1.3<\/sub>, DHvn <\/sub>v\u00e0 DDt<\/sub>. T\u1eeb k\u1ebft qu\u1ea3 ph\u00e2n t\u00edch cho th\u1ea5y Kha th\u1ee5 nguy\u00ean tr\u1ed3ng t\u1ea1i T\u00e2y Nguy\u00ean n\u00ean \u00e1p d\u1ee5ng ph\u01b0\u01a1ng th\u1ee9c tr\u1ed3ng h\u1ed7n giao v\u1edbi B\u1eddi l\u1eddi \u1edf m\u1eadt \u0111\u1ed9 830 c\u00e2y\/ha th\u00ec cho l\u01b0\u1ee3ng t\u0103ng tr\u01b0\u1edfng b\u00ecnh qu\u00e2n chung \u0111\u1ea1t cao nh\u1ea5t.<\/p>\n

B\u1ea3ng 3.4. T\u0103ng tr\u01b0\u1edfng c\u1ee7a Kha th\u1ee5 nguy\u00ean t\u1ea1i \u0110am R\u00f4ng – L\u00e2m \u0110\u1ed3ng \u1edf tu\u1ed5i 3<\/p>\n\n\n\n\n\n\n\n\n
\n

Ph\u01b0\u01a1ng th\u1ee9c tr\u1ed3ng<\/p>\n<\/td>\n

\n

M\u1eadt \u0111\u1ed9<\/p>\n<\/td>\n<\/tr>\n

\n

830 c\u00e2y\/ha<\/p>\n<\/td>\n

\n

1.100 c\u00e2y\/ha<\/p>\n<\/td>\n

\n

1.660 c\u00e2y\/ha<\/p>\n<\/td>\n<\/tr>\n

\n

DD1.3<\/sub><\/p>\n

(cm)<\/p>\n<\/td>\n

\n

DHvn<\/sub><\/p>\n

(m)<\/p>\n<\/td>\n

\n

DDt<\/sub><\/p>\n

(m)<\/p>\n<\/td>\n

\n

DD1.3<\/sub><\/p>\n

(cm)<\/p>\n<\/td>\n

\n

DHvn<\/sub><\/p>\n

(m)<\/p>\n<\/td>\n

\n

DDt<\/sub><\/p>\n

(m)<\/p>\n<\/td>\n

\n

DD1.3<\/sub><\/p>\n

(cm)<\/p>\n<\/td>\n

\n

DHvn<\/sub><\/p>\n

(m)<\/p>\n<\/td>\n

\n

DDt<\/sub><\/p>\n

(m)<\/p>\n<\/td>\n<\/tr>\n

Kha th\u1ee5 nguy\u00ean (KTN)<\/td>\n\n

0,79<\/p>\n<\/td>\n

\n

1,03<\/p>\n<\/td>\n

\n

0,59<\/p>\n<\/td>\n

\n

0,72<\/p>\n<\/td>\n

\n

0,92<\/p>\n<\/td>\n

\n

0,50<\/p>\n<\/td>\n

\n

0,68<\/b><\/p>\n<\/td>\n

\n

0,91<\/b><\/p>\n<\/td>\n

\n

0,47<\/b><\/p>\n<\/td>\n<\/tr>\n

KTN h\u1ed7n giao Keo TT<\/td>\n\n

0,85<\/p>\n<\/td>\n

\n

1,06<\/p>\n<\/td>\n

\n

0,60<\/p>\n<\/td>\n

\n

0,80<\/p>\n<\/td>\n

\n

0,95<\/p>\n<\/td>\n

\n

0,55<\/p>\n<\/td>\n

\n

0,80<\/p>\n<\/td>\n

\n

0,95<\/p>\n<\/td>\n

\n

0,54<\/p>\n<\/td>\n<\/tr>\n

KTN h\u1ed7n giao B\u1eddi l\u1eddi<\/td>\n\n

0,88<\/b><\/p>\n<\/td>\n

\n

1,07<\/b><\/p>\n<\/td>\n

\n

0,62<\/b><\/p>\n<\/td>\n

\n

0,83<\/p>\n<\/td>\n

\n

0,95<\/p>\n<\/td>\n

\n

0,59<\/p>\n<\/td>\n

\n

0,80<\/p>\n<\/td>\n

\n

0,95<\/p>\n<\/td>\n

\n

0,56<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

3.4.6. K\u1ebft qu\u1ea3 m\u00f4 h\u00ecnh tr\u1ed3ng ph\u00e2n t\u00e1n trong c\u00e1c v\u01b0\u1eddn h\u1ed9 gia \u0111\u00ecnh<\/p>\n

M\u00f4 h\u00ecnh tr\u1ed3ng ph\u00e2n t\u00e1n t\u1ef7 l\u1ec7 s\u1ed1ng c\u1ee7a c\u00e2y tr\u1ed3ng kh\u00e1 cao (> 86%), cao nh\u1ea5t l\u00e0 Kha th\u1ee5 nguy\u00ean tr\u1ed3ng quanh v\u01b0\u1eddn nh\u00e0. Sinh tr\u01b0\u1edfng trung b\u00ecnh sau 1 n\u0103m tr\u1ed3ng c\u1ee7a D\u1ebb anh v\u1ec1 \u0111\u01b0\u1eddng k\u00ednh D1.3<\/sub> l\u00e0 1,29 cm; Chi\u1ec1u cao v\u00fat ng\u1ecdn (Hvn<\/sub>) \u0111\u1ea1t 1,16 m v\u00e0 \u0111\u01b0\u1eddng k\u00ednh t\u00e1n (Dt<\/sub>) \u0111\u1ea1t 0,7 m. V\u1edbi Kha th\u1ee5 nguy\u00ean D1.3<\/sub> l\u00e0 1,26 cm; Chi\u1ec1u cao v\u00fat ng\u1ecdn (Hvn<\/sub>) \u0111\u1ea1t 1,28 m v\u00e0 \u0111\u01b0\u1eddng k\u00ednh t\u00e1n (Dt<\/sub>) \u0111\u1ea1t 0,66 m. So v\u1edbi m\u00f4 h\u00ecnh th\u00ed nghi\u1ec7m tr\u1ed3ng t\u1eadp trung th\u00ec sinh tr\u01b0\u1edfng trung b\u00ecnh v\u1ec1 D1.3<\/sub>; Hvn<\/sub> v\u00e0 Dt<\/sub> c\u1ee7a m\u00f4 h\u00ecnh c\u00e2y ph\u00e2n t\u00e1n t\u0103ng g\u1ea5p 2 l\u1ea7n. K\u1ebft qu\u1ea3 tr\u00ean cho th\u1ea5y m\u00f4 h\u00ecnh tr\u1ed3ng D\u1ebb anh v\u00e0 Kha th\u1ee5 nguy\u00ean t\u1ea1i v\u01b0\u1eddn h\u1ed9 (n\u01b0\u01a1ng c\u00e0 ph\u00ea v\u00e0 v\u01b0\u1eddn quanh nh\u00e0) kh\u00e1 tri\u1ec3n v\u1ecdng. \u0110\u00e2y l\u00e0 m\u00f4 h\u00ecnh c\u1ea7n \u0111\u01b0\u1ee3c tri\u1ec3n khai nh\u00e2n r\u1ed9ng trong nh\u1eefng \u0111i\u1ec1u ki\u1ec7n t\u01b0\u01a1ng t\u1ef1.<\/p>\n

3.5. K\u1ebft qu\u1ea3 th\u1eed nghi\u1ec7m g\u00e2y tr\u1ed3ng 3 lo\u00e0i d\u1ebb \u0103n h\u1ea1t t\u1ea1i T\u00e2y Nguy\u00ean<\/p>\n

M\u00f4 h\u00ecnh tr\u1ed3ng th\u1eed nghi\u1ec7m 3 lo\u00e0i D\u1ebb y\u00ean th\u1ebf, D\u1ebb tr\u00f9ng kh\u00e1nh v\u00e0 D\u1ebb trung qu\u1ed1c t\u1ecf ra kh\u00f4ng th\u00edch h\u1ee3p v\u1edbi \u0111i\u1ec1u ki\u1ec7n kh\u00ed h\u1eadu v\u00e0 \u0111\u1ea5t \u0111ai. Theo d\u00f5i c\u00e2y 3 th\u00e1ng \u0111\u1ea7u sau khi tr\u1ed3ng t\u1ef7 l\u1ec7 s\u1ed1ng kh\u00e1 cao (> 87 %), sau 12 th\u00e1ng c\u00e2y tr\u1ed3ng c\u00f3 hi\u1ec7n t\u01b0\u1ee3ng ch\u1ebft d\u1ea7n, t\u1ef7 l\u1ec7 s\u1ed1ng th\u1ea5p < 20,5%. T\u1eeb k\u1ebft qu\u1ea3 ph\u00e2n t\u00edch tr\u00ean cho th\u1ea5y v\u1edbi 3 lo\u00e0i d\u1ebb \u0103n h\u1ea1t c\u00f3 xu\u1ea5t x\u1ee9 t\u1eeb mi\u1ec1n B\u1eafc (D\u1ebb tr\u00f9ng kh\u00e1nh, D\u1ebb y\u00ean th\u1ebf v\u00e0 D\u1ebb trung qu\u1ed1c) kh\u00f4ng n\u00ean d\u1eabn gi\u1ed1ng tr\u1ed3ng t\u1ea1i 2 \u0111\u1ecba \u0111i\u1ec3m tr\u1ed3ng th\u1eed nghi\u1ec7m tr\u00ean v\u00e0 c\u00e1c \u0111\u1ecba \u0111i\u1ec3m c\u00f3 \u0111i\u1ec1u ki\u1ec7n kh\u00ed h\u1eadu, \u0111\u1ea5t \u0111ai t\u01b0\u01a1ng t\u1ef1 \u1edf c\u00e1c t\u1ec9nh v\u00f9ng T\u00e2y Nguy\u00ean.<\/p>\n

(iv). K\u1ebft lu\u1eadn v\u00e0 \u0111\u1ec1 ngh\u1ecb<\/b><\/p>\n

4.1. K\u1ebft lu\u1eadn<\/i><\/b><\/p>\n

1. V\u00f9ng T\u00e2y Nguy\u00ean \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh c\u00f3 11 lo\u00e0i d\u1ebb cho h\u1ea1t \u0103n \u0111\u01b0\u1ee3c thu\u1ed9c 2 chi Castanopsis<\/i> (9\/11 lo\u00e0i) v\u00e0 Lithocarpus<\/i> (2\/11 lo\u00e0i). D\u1ebb anh v\u00e0 Kha th\u1ee5 nguy\u00ean l\u00e0 2 lo\u00e0i c\u00f3 bi\u00ean \u0111\u1ed9 sinh th\u00e1i r\u1ed9ng. Ph\u1ea7n l\u1edbn d\u1ebb \u0103n h\u1ea1t \u1edf T\u00e2y Nguy\u00ean (72,7%) th\u01b0\u1eddng ch\u1ec9 xu\u1ea5t hi\u1ec7n trong ki\u1ec3u r\u1eebng l\u00e1 r\u1ed9ng th\u01b0\u1eddng xanh. V\u1edbi 3 lo\u00e0i nh\u01b0 D\u1ebb anh, C\u00e0 \u1ed5i trung hoa v\u00e0 S\u1ed3i \u0111\u1ecf th\u00ec xu\u1ea5t hi\u1ec7n trong 2 ki\u1ec3u r\u1eebng l\u00e0 r\u1eebng l\u00e1 r\u1ed9ng th\u01b0\u1eddng xanh v\u00e0 r\u1eebng b\u00e1n th\u01b0\u1eddng xanh c\u00e2y l\u00e1 r\u1ed9ng xen c\u00e2y l\u00e1 kim. S\u1ed1 lo\u00e0i d\u1ebb \u0103n h\u1ea1t ph\u00e2n b\u1ed1 \u1edf \u0111\u1ed9 cao < 1.500 m chi\u1ebfm ch\u1ee7 y\u1ebfu 8\/11 lo\u00e0i (72,7%).<\/p>\n

2. Ch\u1ec9 s\u1ed1 IV % c\u1ee7a D\u1ebb anh dao \u0111\u1ed9ng l\u1edbn t\u1eeb 2,2 – 30,9 %, v\u1edbi Kha th\u1ee5 nguy\u00ean ch\u1ec9 s\u1ed1 n\u00e0y t\u1eeb 1,3 – 24,1 %. T\u1ed5 th\u00e0nh t\u1ea7ng c\u00e2y g\u1ed7 cao \u0111\u01a1n gi\u1ea3n. S\u1ed1 lo\u00e0i tham gia v\u00e0o c\u00f4ng th\u1ee9c t\u1ed5 th\u00e0nh t\u1eeb 4 – 8 lo\u00e0i, \u0111\u1ed9 cao > 1.500 D\u1ebb anh v\u00e0 Kha th\u1ee5 nguy\u00ean kh\u00f4ng c\u00f3 t\u00ean trong c\u00f4ng th\u1ee9c t\u1ed5 th\u00e0nh.<\/p>\n

– D\u1ebb \u0103n h\u1ea1t c\u00f3 kh\u1ea3 n\u0103ng t\u00e1i sinh ch\u1ed3i v\u00e0 h\u1ea1t t\u1ed1t, dao \u0111\u1ed9ng t\u1eeb 165 – 7.810 c\u00e2y\/ha, s\u1ed1 c\u00e2y t\u00e1i sinh c\u00f3 tri\u1ec3n v\u1ecdng chi\u1ebfm t\u1ef7 l\u1ec7 kh\u00f4ng cao < 37,5 %. M\u00f4 h\u00ecnh m\u00f4 ph\u1ecfng quan h\u1ec7 gi\u1eefa n\u0103ng su\u1ea5t v\u00e0 c\u00e1c ch\u1ec9 ti\u00eau sinh tr\u01b0\u1edfng \u0111\u01b0\u1ee3c thi\u1ebft l\u1eadp l\u00e0: .<\/p>\n

3. \u00c1p d\u1ee5ng bi\u1ec7n ph\u00e1p k\u1ef9 thu\u1eadt nu\u00f4i d\u01b0\u1ee1ng r\u1eebng D\u1ebb anh v\u00e0 Kha th\u1ee5 nguy\u00ean v\u1edbi \u0111\u1ed9 t\u00e0n che 0,4 – 0,6 th\u00ec n\u0103ng su\u1ea5t h\u1ea1t c\u00f3 th\u1ec3 t\u0103ng l\u00ean t\u1eeb 22,3 % – 31,7%. B\u00f3n ph\u00e2n v\u1edbi li\u1ec1u l\u01b0\u1ee3ng 1 kg NPK + 5 kg h\u1eefu c\u01a1 vi sinh\/g\u1ed1c ch\u01b0a \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn n\u0103ng su\u1ea5t h\u1ea1t. \u00c1p d\u1ee5ng bi\u1ec7n ph\u00e1p k\u1ef9 thu\u1eadt m\u1edf t\u00e1n v\u1edbi \u0111\u1ed9 t\u00e0n che 0,4 – 0,6, k\u1ebft h\u1ee3p b\u00f3n ph\u00e2n 0,2 kg NPK + 1,5 kg h\u1eefu c\u01a1 vi sinh th\u00ec l\u01b0\u1ee3ng tr\u01b0\u1edfng th\u01b0\u1eddng xuy\u00ean \u0111\u1ecbnh k\u1ef3 c\u00f3 th\u1ec3 t\u0103ng g\u1ea5p 1,3 – 1,6 l\u1ea7n so v\u1edbi \u0111\u1ed1i ch\u1ee9ng.<\/p>\n

4. Gh\u00e9p n\u00eam Kha th\u1ee5 nguy\u00ean t\u1ef7 l\u1ec7 s\u1ed1ng cao nh\u1ea5t (66,7%), v\u1edbi D\u1ebb anh gh\u00e9p \u00e1p t\u1ef7 l\u1ec7 s\u1ed1ng nh\u1ea5t (42,5 %). Gi\u00e2m hom c\u00e0nh v\u1edbi thu\u1ed1c IBA \u1edf n\u1ed3ng \u0111\u1ed9 500 ppm v\u00e0 s\u1eed d\u1ee5ng hom b\u00e1nh t\u1ebb t\u1ef7 l\u1ec7 ra r\u1ec5 \u0111\u1ea1t 28,1 % (sau 30 ng\u00e0y). D\u1ebb anh v\u00e0 Kha th\u1ee5 nguy\u00ean \u00e1p d\u1ee5ng theo ph\u01b0\u01a1ng th\u1ee9c tr\u1ed3ng h\u1ed7n giao v\u1edbi B\u1eddi l\u1eddi \u1edf m\u1eadt \u0111\u1ed9 830 c\u00e2y\/ha cho sinh tr\u01b0\u1edfng t\u1ed1t nh\u1ea5t. M\u00f4 h\u00ecnh tr\u1ed3ng c\u00e2y ph\u00e2n t\u00e1n sinh tr\u01b0\u1edfng sau 1 n\u0103m tr\u1ed3ng t\u0103ng 2 l\u1ea7n so v\u1edbi m\u00f4 h\u00ecnh th\u00ed nghi\u1ec7m tr\u1ed3ng t\u1eadp trung.<\/p>\n

5. D\u1ebb tr\u00f9ng kh\u00e1nh, D\u1ebb y\u00ean th\u1ebf v\u00e0 D\u1ebb trung qu\u1ed1c kh\u00f4ng n\u00ean g\u00e2y tr\u1ed3ng \u1edf \u0110am R\u00f4ng – L\u00e2m \u0110\u1ed3ng v\u00e0 Pleiku – Gia Lai v\u00e0 c\u00e1c \u0111\u1ecba \u0111i\u1ec3m c\u00f3 \u0111i\u1ec1u ki\u1ec7n kh\u00ed h\u1eadu v\u00e0 \u0111\u1ea5t \u0111ai t\u01b0\u01a1ng t\u1ef1 t\u1ea1i T\u00e2y Nguy\u00ean.<\/p>\n

4.2. \u0110\u1ec1 ngh\u1ecb<\/i><\/b><\/i><\/b><\/p>\n

– C\u1ea7n ti\u1ebfp t\u1ee5c nghi\u00ean c\u1ee9u h\u1ec7 th\u1ed1ng bi\u1ec7n ph\u00e1p k\u1ef9 thu\u1eadt l\u00e2m sinh trong g\u00e2y tr\u1ed3ng v\u00e0 ph\u00e1t tri\u1ec3n \u0111\u1ed1i v\u1edbi 9 lo\u00e0i d\u1ebb \u0103n h\u1ea1t c\u00f2n l\u1ea1i.<\/p>\n

– C\u1ea7n ti\u1ebfp t\u1ee5c ch\u0103m s\u00f3c v\u00e0 theo d\u00f5i c\u00e1c m\u00f4 h\u00ecnh c\u1ee7a \u0111\u1ec1 t\u00e0i \u0111\u1ec3 c\u00f3 c\u01a1 s\u1edf khoa h\u1ecdc k\u1ebft lu\u1eadn m\u1ed9t c\u00e1ch kh\u00e1ch quan k\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u.<\/p>\n

(v). T\u00e0i li\u1ec7u tham kh\u1ea3o<\/b><\/p>\n

Ti\u1ebfng Vi\u1ec7t<\/b><\/p>\n

    \n
  1. Nguy\u1ec5n Ti\u1ebfn B\u00e2n (2003), Danh m\u1ee5c c\u00e1c lo\u00e0i th\u1ef1c v\u1eadt Vi\u1ec7t Nam, T\u1eadp II<\/i>, Vi\u1ec7n Sinh th\u00e1i v\u00e0 T\u00e0i nguy\u00ean sinh v\u1eadt, NXB N\u00f4ng nghi\u1ec7p, H\u00e0 N\u1ed9i, tr 227-270.<\/li>\n
  2. \u00a0Nguy\u1ec5n H\u1ea3i Tu\u1ea5t, Nguy\u1ec5n Tr\u1ecdng B\u00ecnh (2005), Khai th\u00e1c v\u00e0 s\u1eed d\u1ee5ng SPSS x\u1eed l\u00fd s\u1ed1 li\u1ec7u trong L\u00e2m nghi\u1ec7p<\/i>, NXB N\u00f4ng nghi\u1ec7p, H\u00e0 N\u1ed9i.<\/li>\n
  3. \u00a0Nguy\u1ec5n H\u1ea3i Tu\u1ea5t, V\u0169 Ti\u1ebfn Hinh, Ng\u00f4 Kim Kh\u00f4i (2006), Ph\u00e2n t\u00edch th\u1ed1ng k\u00ea trong L\u00e2m nghi\u1ec7p<\/i>, NXB N\u00f4ng nghi\u1ec7p, H\u00e0 N\u1ed9i.<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"

    ThS. Tr\u1ea7n L\u00e2m \u0110\u1ed3ng; ThS. Nguy\u1ec5n To\u00e0n Th\u1eafng (i). \u0110\u1eb7t v\u1ea5n \u0111\u1ec1 T\u00e2y Nguy\u00ean l\u00e0 v\u00f9ng c\u00f3 \u0111i\u1ec1u ki\u1ec7n kh\u00ed h\u1eadu, th\u1ed5 nh\u01b0\u1ee1ng, \u0111\u1ecba h\u00ecnh kh\u00e1 \u0111a d\u1ea1ng v\u1eeba c\u00f3 kh\u00ed h\u1eadu nhi\u1ec7t \u0111\u1edbi, v\u1eeba c\u00f3 kh\u00ed h\u1eadu \u00e1 nhi\u1ec7t \u0111\u1edbi, \u0111\u1ecba h\u00ecnh c\u00f3 s\u1ef1 ch\u00eanh l\u1ec7ch v\u1ec1 \u0111\u1ed9 cao t\u1ea1o \u0111i\u1ec1u ki\u1ec7n thu\u1eadn l\u1ee3i […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[21,72],"tags":[],"_links":{"self":[{"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/posts\/13100"}],"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\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/comments?post=13100"}],"version-history":[{"count":1,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/posts\/13100\/revisions"}],"predecessor-version":[{"id":13102,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/posts\/13100\/revisions\/13102"}],"wp:attachment":[{"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/media?parent=13100"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/categories?post=13100"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/tags?post=13100"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}