{"id":8739,"date":"2009-03-24T04:25:12","date_gmt":"2009-03-23T21:25:12","guid":{"rendered":"http:\/\/vafs.gov.vn\/vn\/2009\/03\/nghien-cuu-mot-so-dac-diem-sinh-vat-hoc-cua-cay-cho-chi-lam-co-so-cho-viec-phat-trien-loai-cay-nay-o-vuon-quoc-gia-cuc-phuong\/"},"modified":"2019-09-24T11:03:11","modified_gmt":"2019-09-24T04:03:11","slug":"nghien-cuu-mot-so-dac-diem-sinh-vat-hoc-cua-cay-cho-chi-lam-co-so-cho-viec-phat-trien-loai-cay-nay-o-vuon-quoc-gia-cuc-phuong","status":"publish","type":"post","link":"https:\/\/vafs.gov.vn\/vn\/nghien-cuu-mot-so-dac-diem-sinh-vat-hoc-cua-cay-cho-chi-lam-co-so-cho-viec-phat-trien-loai-cay-nay-o-vuon-quoc-gia-cuc-phuong\/","title":{"rendered":"Nghi\u00ean c\u1ee9u m\u1ed9t s\u1ed1 \u0111\u1eb7c \u0111I\u1ec3m sinh v\u1eadt h\u1ecdc c\u1ee7a c\u00e2y Ch\u00f2 ch\u1ec9 l\u00e0m c\u01a1 s\u1edf cho vi\u1ec7c ph\u00e1t tri\u1ec3n lo\u00e0i c\u00e2y n\u00e0y \u1edf v\u01b0\u1eddn qu\u1ed1c gia C\u00fac Ph\u01b0\u01a1ng"},"content":{"rendered":"

Nghi\u00ean c\u1ee9u m\u1ed9t s\u1ed1 \u0111\u1eb7c \u0111I\u1ec3m sinh v\u1eadt h\u1ecdc c\u1ee7a c\u00e2y Ch\u00f2 ch\u1ec9 <\/strong><\/p>\n

l\u00e0m c\u01a1 s\u1edf cho vi\u1ec7c ph\u00e1t tri\u1ec3n lo\u00e0i c\u00e2y n\u00e0y \u1edf v\u01b0\u1eddn qu\u1ed1c gia C\u00fac Ph\u01b0\u01a1ng<\/strong><\/p>\n

V\u0169 V\u0103n C\u1ea7n<\/strong> <\/em><\/p>\n

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

V\u01b0\u1eddn qu\u1ed1c gia C\u00fac Ph\u01b0\u01a1ng n\u1eb1m tr\u00ean to\u1ea1 \u0111\u1ed9 \u0111\u1ecba l\u00fd t\u1eeb 200<\/sup>14\u2019<\/sup> \u0111\u1ebfn 200<\/sup>24\u2019<\/sup> v\u0129 \u0111\u1ed9 B\u1eafc v\u00e0 t\u1eeb 1050<\/sup> 29\u2019<\/sup> \u0111\u1ebfn 1050<\/sup> 44\u2019<\/sup> kinh \u0111\u1ed9 \u0110\u00f4ng.V\u01b0\u1eddn c\u00f3 t\u1ed5ng di\u1ec7n t\u00edch 22 200ha trong \u0111\u00f3 3\/4 di\u1ec7n t\u00edch C\u00fac Ph\u01b0\u01a1ng l\u00e0 n\u00fai \u0111\u00e1 v\u00f4i, c\u00f3 \u0111\u1ed9 cao tuy\u1ec7t \u0111\u1ed1i trung b\u00ecnh 300 \u2013 400m.<\/p>\n

C\u00fac Ph\u01b0\u01a1ng c\u00f3 kh\u00ed h\u1eadu nhi\u1ec7t \u0111\u1edbi gi\u00f3 m\u00f9a. Nhi\u1ec7t \u0111\u1ed9 trung b\u00ecnh n\u0103m 20,60<\/sup>C, \u0111\u1ed9 \u1ea9m trung b\u00ecnh 90%, t\u1ed5ng l\u01b0\u1ee3ng m\u01b0a trung b\u00ecnh 2138 mm\/n\u0103m. Th\u1ea3m th\u1ef1c v\u1eadt \u1edf \u0111\u00e2y l\u00e0 r\u1eebng m\u01b0a nhi\u1ec7t \u0111\u1edbi th\u01b0\u1eddng xanh. C\u00fac Ph\u01b0\u01a1ng l\u00e0 n\u01a1i r\u1ea5t \u0111a d\u1ea1ng v\u1ec1 c\u1ea5u tr\u00fac t\u1ed5 th\u00e0nh lo\u00e0i trong h\u1ec7 th\u1ef1c v\u1eadt. Hi\u1ec7n t\u1ea1i C\u00fac Ph\u01b0\u01a1ng l\u00e0 n\u01a1i ph\u00e2n b\u1ed1 c\u1ee7a nhi\u1ec1u lo\u00e0i c\u00e2y g\u1ed7 qu\u00fd hi\u1ebfm c\u00f3 ghi trong s\u00e1ch \u0111\u1ecf th\u1ef1c v\u1eadt Vi\u1ec7t Nam..<\/p>\n

Ch\u00f2 ch\u1ec9 l\u00e0 lo\u00e0i c\u00e2y g\u1ed7 l\u1edbn (c\u00f3 trong s\u00e1ch \u0111\u1ecf th\u1ef1c v\u1eadt). Do vi\u1ec7c khai th\u00e1c kh\u00f4ng b\u1ea3o v\u1ec7, hi\u1ec7n t\u1ea1i \u1edf C\u00fac Ph\u01b0\u01a1ng v\u00e0 c\u00e1c n\u01a1i kh\u00e1c Ch\u00f2 ch\u1ec9 c\u00f2n l\u1ea1i r\u1ea5t \u00edt. Do v\u1eady vi\u1ec7c kh\u00f4i ph\u1ee5c l\u1ea1i r\u1eebng Ch\u00f2 ch\u1ec9 l\u00e0 c\u1ea7n thi\u1ebft.<\/p>\n

Vi\u1ec7c s\u1eed d\u1ee5ng c\u00e2y b\u1ea3n \u0111\u1ecba l\u00e0m c\u00e2y m\u1ee5c \u0111\u00edch tr\u1ed3ng r\u1eebng v\u00e0 l\u00e0m gi\u1ea7u r\u1eebng l\u00e0 m\u1ed9t v\u1ea5n \u0111\u1ec1 l\u1edbn. Nhi\u1ec1u n\u01a1i \u0111\u00e3 \u0111\u01b0a ra m\u1ed9t s\u1ed1 lo\u00e0i c\u00e2y b\u1ea3n \u0111\u1ecba c\u1ee7a \u0111\u1ecba ph\u01b0\u01a1ng m\u00ecnh l\u00e0m c\u00e2y m\u1ee5c \u0111\u00edch song g\u1eb7p r\u1ea5t nhi\u1ec1u kh\u00f3 kh\u0103n, \u0111\u1eb7c bi\u1ec7t l\u00e0 nh\u1eefng th\u00f4ng tin v\u1ec1 \u0111\u1eb7c \u0111i\u1ec3m sinh v\u1eadt h\u1ecdc c\u1ee7a lo\u00e0i, \u0111\u1ec3 l\u00e0m c\u01a1 s\u1edf \u0111\u1ec1 xu\u1ea5t c\u00e1c gi\u1ea3i ph\u00e1p k\u1ef9 thu\u1eadt l\u00e2m sinh nh\u1eb1m mang l\u1ea1i hi\u1ec7u qu\u1ea3 cao trong vi\u1ec7c t\u1ea1o r\u1eebng<\/p>\n

Vi\u1ec7c nghi\u00ean c\u1ee9u lo\u00e0i Ch\u00f2 ch\u1ec9 (Parashorea chinensis<\/em> Wang) trong r\u1eebng t\u1ef1 nhi\u00ean, nh\u1eb1m \u0111\u1ec1 xu\u1ea5t m\u1ed9t lo\u00e0i c\u00e2y m\u1edbi c\u00f3 gi\u00e1 tr\u1ecb cho t\u1eadp \u0111o\u00e0n c\u00e2y tr\u1ed3ng r\u1eebng l\u00e0 m\u1ed9t n\u1ed9i dung c\u1ee7a c\u00e1c ho\u1ea1t \u0111\u1ed9ng tr\u00ean.<\/p>\n

1. M\u1ee5c ti\u00eau, n\u1ed9i dung v\u00e0 ph\u01b0\u01a1ng ph\u00e1p nghi\u00ean c\u1ee9u<\/h2>\n

1.1. M\u1ee5c ti\u00eau<\/em><\/strong><\/p>\n

+ X\u00e1c \u0111\u1ecbnh m\u1ed9t s\u1ed1 \u0111\u1eb7c t\u00ednh sinh v\u1eadt h\u1ecdc li\u00ean quan \u0111\u1ebfn t\u1ea1o gi\u1ed1ng v\u00e0 g\u00e2y tr\u1ed3ng lo\u00e0i Ch\u00f2 ch\u1ec9<\/p>\n

+ X\u00e1c \u0111\u1ecbnh bi\u1ec7n ph\u00e1p k\u1ef9 thu\u1eadt t\u1ea1o c\u00e2y con t\u1eeb h\u1ea1t<\/p>\n

1.2. N\u1ed9i dung<\/em><\/strong><\/p>\n

+ M\u1ed9t s\u1ed1 \u0111\u1eb7c \u0111i\u1ec3m sinh v\u1eadt h\u1ecdc c\u1ee7a lo\u00e0i Ch\u00f2 ch\u1ec9<\/p>\n

+ K\u1ef9 thu\u1eadt t\u1ea1o c\u00e2y con t\u1eeb h\u1ea1t<\/p>\n

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

+ Ph\u01b0\u01a1ng ph\u00e1p thu th\u1eadp s\u1ed1 li\u1ec7u<\/p>\n

– \u0110i\u1ec1u tra theo tuy\u1ebfn \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh v\u00f9ng ph\u00e2n b\u1ed1<\/p>\n

– \u0110i\u1ec1u tra theo \u00f4 ti\u00eau chu\u1ea9n \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh m\u1ed9t s\u1ed1 \u0111\u1eb7c t\u00ednh sinh v\u1eadt h\u1ecdc<\/p>\n

– \u0110i\u1ec1u tra theo \u00f4 6 c\u00e2y \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh lo\u00e0i c\u00e2y \u0111i k\u00e8m<\/p>\n

– B\u1ed1 tr\u00ed th\u00ed nghi\u1ec7m \u1edf v\u01b0\u1eddn \u01b0\u01a1m \u0111\u1ec3 nghi\u00ean c\u1ee9u \u1ea3nh h\u01b0\u1edfng c\u1ee7a ch\u1ebf \u0111\u1ed9 che s\u00e1ng, ph\u00e2n b\u00f3n, ch\u0103m s\u00f3c \u0111\u1ebfn sinh tr\u01b0\u1edfng v\u00e0 ph\u00e1t tri\u1ec3n c\u1ee7a c\u00e2y con<\/p>\n

+ Ph\u01b0\u01a1ng ph\u00e1p x\u1eed l\u00fd s\u1ed1 li\u1ec7u<\/p>\n

D\u00f9ng to\u00e1n h\u1ecdc th\u1ed1ng k\u00ea trong ch\u1ec9nh l\u00fd, t\u00ednh to\u00e1n c\u00e1c s\u1ed1 li\u1ec7u \u0111I\u1ec1u tra, d\u00f9ng c\u00e1c ti\u00eau chu\u1ea9n th\u1ed1ng k\u00ea \u0111\u1ec3 ki\u1ec3m tra v\u00e0 \u0111\u00e1nh gi\u00e1 k\u1ebft qu\u1ea3.<\/p>\n

2. K\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u<\/h2>\n

2.1 <\/em><\/strong>\u0110\u1eb7c \u0111i\u1ec3m h\u00ecnh th\u00e1i v\u00e0 v\u1eadt h\u1eadu<\/em><\/strong><\/p>\n

Ch\u00f2 ch\u1ec9 m\u1ecdc trong r\u1eebng t\u1ef1 nhi\u00ean c\u00f3 \u0111\u01b0\u1eddng k\u00ednh ngang ng\u1ef1c \u0111\u1ebfn 200cm, chi\u1ec1u cao v\u00fat ng\u1ecdn \u0111\u1ebfn 70m. Ch\u00f2 ch\u1ec9 ph\u00e2n c\u00e0nh \u1edf 3\/4 chi\u1ec1u cao c\u00e2y, g\u00f3c ph\u00e2n c\u00e0nh l\u1edbn 70\u2013800<\/sup>. Nh\u1eefng c\u00e2y c\u00f3 D1,3<\/sub> >70cm c\u00f3 b\u1ea1nh v\u00e8. V\u1ecf Ch\u00f2 ch\u1ec9 tr\u1eafng ho\u1eb7c n\u00e2u nh\u1ea1t, khi nh\u1ecf h\u01a1i n\u1ee9t d\u1ecdc, khi gi\u00e0 n\u1ee9t d\u1ecdc s\u00e2u v\u00e0 th\u01b0\u1eddng b\u1ecb bong m\u1ea3ng.<\/p>\n

Ch\u00f2 ch\u1ec9 c\u00f3 l\u00e1 \u0111\u01a1n m\u1ecdc c\u00e1ch, l\u00e1 h\u00ecnh tr\u00e1i xoan d\u00e0i, \u1edf n\u00e1ch l\u00e1 c\u00f3 2 l\u00e1 k\u00e8m h\u00ecnh tai chu\u1ed9t, l\u00e1 h\u01a1i r\u00e1p, m\u00e9p nguy\u00ean, m\u1eb7t sau c\u00f3 10 \u2013 15 \u0111\u00f4i g\u00e2n th\u1ee9 c\u1ea5p n\u1ed5i r\u00f5 v\u00e0 ph\u00e2n b\u1ed1 so le nhau qua g\u00e2n ch\u00ednh<\/p>\n

Hoa t\u1ef1 b\u00f4ng \u1edf \u0111\u1ea7u c\u00e0nh ho\u1eb7c n\u00e1ch l\u00e1, m\u1ed7i hoa c\u00f3 m\u1ed9t l\u00e1 b\u1eafc m\u1ea7u tr\u1eafng<\/p>\n

Qu\u1ea3 d\u00e0i 15 \u2013 18mm, r\u1ed9ng 5 \u2013 6mm. Qu\u1ea3 c\u00f3 5 c\u00e1nh do \u0111\u00e0i ph\u00e1t tri\u1ec3n th\u00e0nh, Ch\u00f2 ch\u1ec9 ra hoa v\u00e0o th\u00e1ng 5 \u2013 6, qu\u1ea3 ch\u00edn v\u00e0o th\u00e1ng 7 \u2013 8.<\/p>\n

2.2.<\/em><\/strong>M\u1ed9t s\u1ed1 \u0111\u1eb7c \u0111i\u1ec3m v\u1ec1 c\u00e1c nh\u00e2n t\u1ed1 sinh th\u00e1i n\u01a1i Ch\u00f2 ch\u1ec9 ph\u00e2n b\u1ed1 <\/em><\/strong><\/p>\n

T\u1ea1i C\u00fac Ph\u01b0\u01a1ng, Ch\u00f2 ch\u1ec9 ph\u00e2n b\u1ed1 ch\u1ee7 y\u1ebfu tr\u00ean \u0111\u1ea5t Feralit ph\u00e1t tri\u1ec3n tr\u00ean \u0111\u00e1 v\u00f4i, t\u1ea7ng \u0111\u1ea5t kh\u00e1 d\u00e0y (\u0111\u1ea5t t\u1ea7ng A \u0111\u1ebfn B ho\u1eb7c \u0111\u1ebfn BC s\u00e2u t\u1edbi 140cm.)<\/p>\n

M\u1ed9t n\u0103m \u1edf C\u00fac Ph\u01b0\u01a1ng th\u01b0\u1eddng c\u00f3 3 th\u00e1ng kh\u00f4 (th\u00e1ng 1, 2 v\u00e0 th\u00e1ng 12). \u0110\u1ed9 ki\u1ec7t trong th\u1eddi gian kh\u00f4 l\u00e0 4,07%. M\u1ee9c \u0111\u1ed9 t\u1eadp trung c\u1ee7a m\u00f9a m\u01b0a l\u00ean t\u1edbi 95,93%. H\u1ec7 s\u1ed1 t\u01b0\u01a1ng quan \u1ea9m nhi\u1ec7t K = 2,86.<\/p>\n

2.3.<\/em><\/strong>\u0110\u1eb7c \u0111i\u1ec3m l\u00e2m ph\u1ea7n c\u00f3 Ch\u00f2 ch\u1ec9 ph\u00e2n b\u1ed1<\/em><\/strong><\/p>\n

a. <\/em>T\u1ed5 th\u00e0nh lo\u00e0i c\u00e2y g\u1ed7<\/em><\/p>\n

\u0110\u00e3 \u0111i\u1ec1u tra 8 \u00f4 ti\u00eau chu\u1ea9n, m\u1ed7i \u00f4 r\u1ed9ng 2500m2<\/sup> c\u00f3 1489 c\u00e1 th\u1ec3 c\u1ee7a 132 lo\u00e0i. C\u00f4ng th\u1ee9c t\u1ed5 th\u00e0nh g\u1ed3m 17 lo\u00e0i chi\u1ebfm 12,89% s\u1ed1 lo\u00e0i nh\u01b0ng c\u00f3 \u0111\u1ebfn 1034 c\u00e1 th\u1ec3, chi\u1ebfm 69,03% t\u1ed5ng s\u1ed1 c\u00e2y. \u0110i\u1ec1u n\u00e0y cho th\u1ea5y \u01b0u th\u1ebf v\u1ec1 s\u1ed1 c\u00e1 th\u1ec3 c\u1ee7a c\u00e1c lo\u00e0i trong c\u00f4ng th\u1ee9c t\u1ed5 th\u00e0nh so v\u1edbi c\u00e1c lo\u00e0i c\u00f2n l\u1ea1i l\u00e0 t\u01b0\u01a1ng \u0111\u1ed1i r\u00f5 n\u00e9t.<\/p>\n

Ch\u00f2 ch\u1ec9 c\u00f3 32 c\u00e1 th\u1ec3, chi\u1ebfm 2,1% s\u1ed1 c\u00e2y trong l\u00e2m ph\u1ea7n. Trong th\u1ee9 x\u1ebfp h\u1ea1ng, Ch\u00f2 ch\u1ec9 \u0111\u1ee9ng \u1edf v\u1ecb tr\u00ed th\u1ee9 t\u01b0.<\/p>\n

b. T\u1ed5 th\u00e0nh theo ti\u1ebft di\u1ec7n ngang<\/em><\/p>\n

C\u00f4ng th\u1ee9c t\u1ed5 th\u00e0nh theo ti\u1ebft di\u1ec7n ngang (G) c\u00f3 23 lo\u00e0i, chi\u1ebfm 75,88% t\u1ed5ng G c\u1ee7a to\u00e0n l\u00e2m ph\u1ea7n, cao g\u1ea5p 3,15 l\u1ea7n t\u1ed5ng G c\u1ee7a 109 lo\u00e0i c\u00f2n l\u1ea1i.<\/p>\n

X\u00e9t v\u1ecb tr\u00ed c\u1ee7a Ch\u00f2 ch\u1ec9 trong l\u00e2m ph\u1ea7n, Ch\u00f2 ch\u1ec9 chi\u1ebfm 2,1% s\u1ed1 c\u00e1 th\u1ec3 nh\u01b0ng \u0111\u1ea1t \u0111\u1ebfn 25% t\u1ed5ng G. Nh\u01b0 v\u1eady m\u1ee9c \u0111\u1ed9 \u01b0u th\u1ebf c\u1ee7a Ch\u00f2 ch\u1ec9 v\u1ec1 ti\u1ebft di\u1ec7n ngang so v\u1edbi s\u1ed1 c\u00e1 th\u1ec3 l\u00e0 11,9 l\u1ea7n.<\/p>\n

c. M\u1ee9c \u0111\u1ed9 \u1ea3nh h\u01b0\u1edfng cua c\u00e1c lo\u00e0i \u0111\u1ebfn l\u00e2m ph\u1ea7n<\/em><\/p>\n

M\u1ee9c \u0111\u1ed9 \u1ea3nh h\u01b0\u1edfng c\u1ee7a c\u00e1c lo\u00e0i \u0111\u1ebfn l\u00e2m ph\u1ea7n \u0111\u01b0\u1ee3c \u0111\u00e1nh gi\u00e1 qua ch\u1ec9 s\u1ed1 IV. Ch\u1ec9 s\u1ed1 IV \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh b\u1eb1ng tr\u1ecb trung b\u00ecnh gi\u1eefa \u0111\u1ed9 phong ph\u00fa (t\u1ed5 th\u00e0nh lo\u00e0i) v\u00e0 m\u1ee9c \u0111\u1ed9 \u01b0u th\u1ebf (t\u1ed5 th\u00e0nh theo G). Nh\u1eefng lo\u00e0i c\u00f3 IV\u00b35% m\u1edbi th\u1ef1c s\u1ef1 c\u00f3 \u00fd ngh\u0129a chi ph\u1ed1i \u0111\u1ebfn sinh tr\u01b0\u1edfng v\u00e0 ph\u00e1t tri\u1ec3n c\u1ee7a l\u00e2m ph\u1ea7n<\/p>\n

Bi\u1ec3u 1. M\u1ee9c \u0111\u1ed9 \u1ea3nh h\u01b0\u1edfng c\u1ee7a c\u00e1c lo\u00e0i \u0111\u1ebfn l\u00e2m ph\u1ea7n<\/em><\/h6>\n\n\n\n\n\n\n\n
TT<\/strong><\/td>\nT\u00ean lo\u00e0i<\/strong><\/td>\nS\u1ed1 c\u00e2y<\/strong><\/p>\n

(N)<\/td>\n

T\u1ec9 l\u1ec7 % theo<\/strong><\/p>\n

(N)<\/td>\n

T\u1ec9 l\u1ec7 % theo<\/strong><\/p>\n

(G)<\/td>\n

IV<\/strong><\/td>\n<\/tr>\n
1<\/td>\nNh\u00f2 v\u00e0ng<\/td>\n478<\/td>\n31,9<\/td>\n7,62<\/td>\n19,6<\/td>\n<\/tr>\n
2<\/td>\nCh\u00f2 ch\u1ec9<\/td>\n32<\/td>\n2,1<\/td>\n25,0<\/td>\n13,55<\/td>\n<\/tr>\n
2<\/td>\n\u00d4 r\u00f4<\/td>\n211<\/td>\n14,0<\/td>\n2,52<\/td>\n8,26<\/td>\n<\/tr>\n
4<\/td>\nV\u00e0ng anh<\/td>\n83<\/td>\n5,5<\/td>\n5,75<\/td>\n5,63<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Trong t\u1ed5ng s\u1ed1 31 l\u01b0\u1ee3t lo\u00e0i c\u00f3 m\u1eb7t trong 2 c\u00f4ng th\u1ee9c t\u1ed5 th\u00e0nh theo s\u1ed1 c\u00e2y (N) v\u00e0 theo ti\u1ebft di\u1ec7n ngang (G), c\u00f3 9 lo\u00e0i tr\u00f9ng nhau nh\u01b0ng ch\u1ec9 c\u00f3 4 lo\u00e0i trong bi\u1ec3u tr\u00ean c\u00f3 ch\u1ec9 s\u1ed1 IV>5% (Bi\u1ec3u 1). Nh\u01b0 v\u1eady 4 lo\u00e0i tr\u00ean l\u00e0 nh\u1eefng lo\u00e0i th\u1ef1c s\u1ef1 c\u00f3 \u00fd ngh\u0129a chi ph\u1ed1i \u0111\u1ebfn sinh tr\u01b0\u1edfng v\u00e0 ph\u00e1t tri\u1ec3n c\u1ee7a l\u00e2m ph\u1ea7n.<\/p>\n

d. C\u00e2\u00fa tr\u00fac m\u1eadt \u0111\u1ed9 r\u1eebng t\u1ef1 nhi\u00ean n\u01a1i Ch\u00f2 ch\u1ec9 ph\u00e2n b\u1ed1<\/em><\/p>\n

M\u1eadt \u0111\u1ed9 l\u00e2m ph\u1ea7n \u0111\u1ea1t 749c\u00e2y\/ha, kh\u00f4ng gian dinh d\u01b0\u1ee1ng b\u00ecnh qu\u00e2n cho m\u1ed9t c\u00e2y l\u00e0 13,4m2<\/sup>. M\u1eadt \u0111\u1ed9 c\u1ee7a Ch\u00f2 ch\u1ec9 \u1edf nh\u1eefng v\u1ecb tr\u00ed ph\u00e2n b\u1ed1 \u0111i\u1ec3n h\u00ecnh l\u00e0 16c\u00e2y\/ha.<\/p>\n

e. C\u1ea5u tr\u00fac t\u1ea7ng th\u1ee9 l\u00e2m ph\u1ea7n c\u00f3 Ch\u00f2 ch\u1ec9 ph\u00e2n b\u1ed1<\/em><\/p>\n

\u1edf c\u00e1c l\u00e2m ph\u1ea7n c\u00f3 Ch\u00f2 ch\u1ec9 ph\u00e2n b\u1ed1 \u0111\u00e3 \u0111i\u1ec1u tra, th\u1ec3 hi\u1ec7n r\u00f5 c\u1ea5u tr\u00fac c\u1ee7a r\u1eebng 5 t\u1ea7ng. Ch\u00f2 ch\u1ec9 c\u00f3 m\u1eb7t \u1edf c\u1ea3 3 t\u1ea7ng c\u00e2y g\u1ed7. \u0110i\u1ec1u n\u00e0y cho ph\u00e9p kh\u1eb3ng \u0111\u1ecbnh r\u1eb1ng, Ch\u00f2 ch\u1ec9 t\u00e1i sinh li\u00ean t\u1ee5c. Tuy v\u1eady, s\u1ed1 l\u01b0\u1ee3ng c\u00e2y Ch\u00f2 ch\u1ec9 \u1edf t\u1ea7ng cao l\u1edbn h\u01a1n s\u1ed1 l\u01b0\u1ee3ng c\u00e2y m\u1edbi tham gia v\u00e0o t\u1ea7ng c\u00e2y g\u1ed7. \u0110\u00e2y l\u00e0 m\u1ed9t \u0111\u1eb7c \u0111i\u1ec3m c\u1ea7n ch\u00fa \u00fd \u0111\u1ec3 b\u1ea3o \u0111\u1ea3m s\u1ef1 t\u1ed3n t\u1ea1i b\u00ecnh th\u01b0\u1eddng c\u1ee7a lo\u00e0i Ch\u00f2 ch\u1ec9 \u1edf C\u00fac Ph\u01b0\u01a1ng.<\/p>\n

f. T\u1ed5 th\u00e0nh nh\u00f3m lo\u00e0i c\u00e2y m\u1ecdc c\u00f9ng <\/em><\/p>\n

K\u1ebft qu\u1ea3 \u0111i\u1ec1u tra t\u1ea1i 50 \u0111i\u1ec3m v\u1edbi 300 c\u00e1 th\u1ec3 \u0111\u00e3 x\u00e1c \u0111\u1ecbnh \u0111\u01b0\u1ee3c 79 lo\u00e0i \u0111i c\u00f9ng (Bi\u1ec3u 2)<\/p>\n

Bi\u1ec3u 2. Nh\u00f3m lo\u00e0i c\u00e2y b\u1ea1n c\u1ee7a Ch\u00f2 ch\u1ec9<\/em><\/h4>\n\n\n\n\n\n\n
Ch\u1ec9 ti\u00eau<\/strong><\/p>\n

K\u1ebft qu\u1ea3<\/strong><\/p>\n

Nh\u00f3m<\/strong><\/td>\n

\n

S\u1ed1 c\u00e2y<\/h1>\n

(N)<\/td>\n

T\u1ea7n s\u1ed1 xu\u1ea5t hi\u1ec7n trung b\u00ecnh theo s\u1ed1 c\u00e2y<\/strong><\/p>\n

(Pc)<\/td>\n

T\u1ea7n s\u1ed1 xu\u1ea5t hi\u1ec7n trung b\u00ecnh theo s\u1ed1 \u00f4<\/strong><\/p>\n

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

I (R\u1ea5t hay g\u1eb7p)<\/td>\n116<\/td>\n19,3<\/td>\n62,0<\/td>\n<\/tr>\n
II (Hay g\u1eb7p)<\/td>\n18<\/td>\n3,15<\/td>\n17,0<\/td>\n<\/tr>\n
III (\u00edt g\u1eb7p)<\/td>\n166<\/td>\n0,73<\/td>\n3,99<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Nh\u00f3m c\u00e2y r\u1ea5t hay g\u1eb7p g\u1ed3m c\u00f3 Nh\u00f2 v\u00e0ng, V\u00e0ng anh.<\/p>\n

Nh\u00f3m c\u00e2y hay g\u1eb7p g\u1ed3m c\u00f3 S\u00e2ng, G\u1ed9i g\u00e1c<\/p>\n

Nh\u00f3m c\u00e2y \u00edt g\u1eb7p g\u1ed3m c\u00f3 Tr\u00e1m mao, Th\u1eebng m\u1ef1c, Ch\u00f2 ch\u1ec9\u2026<\/p>\n

Nh\u00f2 v\u00e0ng l\u00e0 lo\u00e0i xu\u1ea5t hi\u1ec7n c\u1ea1nh Ch\u00f2 ch\u1ec9 nhi\u1ec1u nh\u1ea5t, v\u1edbi t\u1ea7n xu\u1ea5t xu\u1ea5t hi\u1ec7n 28,3% theo s\u1ed1 c\u00e2y v\u00e0 70% theo s\u1ed1 \u00f4 \u0111i\u1ec1u tra. Ch\u00f2 ch\u1ec9 xu\u1ea5t hi\u1ec7n nh\u01b0 l\u00e0 c\u00e2y b\u1ea1n c\u1ee7a ch\u00ednh n\u00f3 v\u1edbi t\u1ea7n xu\u1ea5t th\u1ea5p 1,3% theo s\u1ed1 c\u00e1 th\u1ec3 v\u00e0 8% theo s\u1ed1 \u00f4 \u0111i\u1ec1u tra. \u0110i\u1ec1u n\u00e0y ph\u1ea3n \u00e1nh t\u00ednh qu\u1ea7n sinh kh\u00f4ng r\u00f5 r\u1ec7t c\u1ee7a Ch\u00f2 ch\u1ec9, ph\u00f9 h\u1ee3p v\u1edbi \u0111\u1eb7c \u0111i\u1ec3m ph\u00e2n b\u1ed1 v\u00e0 t\u1ec9 l\u1ec7 t\u1ed5 th\u00e0nh th\u1ea5p c\u1ee7a lo\u00e0i c\u00e2y n\u00e0y trong r\u1eebng t\u1ef1 nhi\u00ean.<\/p>\n

2.4.<\/em><\/strong>\u0110\u1eb7c \u0111i\u1ec3m t\u00e1i sinh t\u1ef1 nhi\u00ean c\u1ee7a Ch\u00f2 ch\u1ec9<\/em><\/strong><\/p>\n

a. T\u1ed5 th\u00e0nh c\u00e2y t\u00e1i sinh<\/em><\/p>\n

\u0110i\u1ec1u tra c\u00e2y t\u00e1i sinh trong 256 \u00f4 d\u1ea1ng b\u1ea3n \u1edf 8 \u00f4 ti\u00eau chu\u1ea9n, c\u00f3 1017 c\u00e1 th\u1ec3 c\u1ee7a 70 lo\u00e0i. C\u00f4ng th\u1ee9c t\u1ed5 th\u00e0nh c\u00f3 9 lo\u00e0i, chi\u1ebfm 12,86% s\u1ed1 lo\u00e0i c\u00e2y t\u00e1i sinh nh\u01b0ng c\u00f3 t\u1edbi 814 c\u00e1 th\u1ec3, chi\u1ebfm 79,98% s\u1ed1 c\u00e2y t\u00e1i sinh trong l\u00e2m ph\u1ea7n. 61 lo\u00e0i c\u00f2n l\u1ea1i ch\u1ec9 chi\u1ebfm 20,02%. Nh\u01b0 v\u1eady, c\u00e1c lo\u00e0i trong c\u00f4ng th\u1ee9c t\u1ed5 th\u00e0nh chi\u1ebfm \u01b0u th\u1ebf r\u00f5 r\u1ec7t v\u1ec1 s\u1ed1 c\u00e1 th\u1ec3.<\/p>\n

Trong l\u1edbp c\u00e2y t\u00e1i sinh c\u00f3 15 c\u00e1 th\u1ec3 Ch\u00f2 ch\u1ec9, chi\u1ebfm h\u1ec7 s\u1ed1 th\u1ea5p (0,15) v\u00e0 \u0111\u1ee9ng \u1edf v\u1ecb tr\u00ed cu\u1ed1i c\u00f9ng trong th\u1ee9 x\u1ebfp h\u1ea1ng c\u1ee7a c\u00f4ng th\u1ee9c t\u1ed5 th\u00e0nh c\u00e2y t\u00e1i sinh, nh\u01b0ng trong c\u00f4ng th\u1ee9c t\u1ed5 th\u00e0nh c\u00e2y g\u1ed7 Ch\u00f2 ch\u1ec9 c\u00f3 h\u1ec7 s\u1ed1 t\u1ed5 th\u00e0nh 0,21 v\u00e0 \u0111\u1ee9ng \u1edf v\u1ecb tr\u00ed th\u1ee9 t\u01b0 trong t\u1ed5ng s\u1ed1 17 lo\u00e0i. K\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u tr\u00ean cho th\u1ea5y Ch\u00f2 ch\u1ec9 c\u00f3 s\u1ee9c s\u1ed1ng m\u1ea1nh.<\/p>\n

b. M\u1eadt \u0111\u1ed9 ch\u1ea5t l\u1ef1\u01a1ng c\u00e2y t\u00e1i sinh.<\/em><\/p>\n

Ch\u00f2 ch\u1ec9 c\u00f3 m\u1eadt \u0111\u1ed9 t\u00e1i sinh 146 c\u00e2y\/ha, so v\u1edbi s\u1ed1 l\u01b0\u1ee3ng c\u00e2y g\u1ed7 16 c\u00e2y\/ ha. Nh\u01b0 v\u1eady s\u1ed1 l\u01b0\u1ee3ng c\u00e2y g\u1ed7 b\u1eb1ng 10,9% so v\u1edbi s\u1ed1 c\u00e2y t\u00e1i sinh. Trong t\u1ed5ng s\u1ed1 15 c\u00e2y Ch\u00f2 ch\u1ec9 t\u00e1i sinh, c\u00f3 4 c\u00e2y c\u00f3 tri\u1ec3n v\u1ecdng, chi\u1ebfm 26,67%. \u0110i\u1ec1u n\u00e0y ph\u00f9 h\u1ee3p v\u1edbi s\u1ed1 l\u01b0\u1ee3ng t\u1ea7ng c\u00e2y cao c\u00f3 trong l\u00e2m ph\u1ea7n l\u00e0 \u00edt.<\/p>\n

c. Ph\u00e2n b\u1ed1 c\u1ee7a c\u00e2y Ch\u00f2 ch\u1ec9 t\u00e1i sinh.<\/em><\/p>\n

Trong 256 \u00f4 ti\u00eau chu\u1ea9n d\u1ea1ng b\u1ea3n \u1edf 6 \u00f4 ti\u00eau chu\u1ea9n \u0111\u1ecbnh v\u1ecb, c\u00f3 15 c\u00e1 th\u1ec3 Ch\u00f2 ch\u1ec9. B\u00ecnh qu\u00e2n c\u00f3 0,0586 c\u00e1 th\u1ec3 trong 1 \u00f4 ti\u00eau chu\u1ea9n d\u1ea1ng b\u1ea3n. S\u1eed d\u1ee5ng ph\u00e2n b\u1ed1 Poisson c\u00f3 k\u1ebft qu\u1ea3 w= 2,0746. K\u1ebft qu\u1ea3 tr\u00ean cho th\u1ea5y Ch\u00f2 ch\u1ec9 t\u00e1i sinh c\u00f3 d\u1ea1ng ph\u00e2n b\u1ed1 theo c\u1ee5m, \u0111\u00e1m.<\/p>\n

\u0110\u1ec3 l\u00e0m r\u00f5 th\u00eam v\u1ea5n \u0111\u1ec1 ph\u00e2n b\u1ed1 c\u00e2y t\u00e1i sinh, \u0111\u1ec1 t\u00e0i \u0111\u00e3 ti\u1ebfn h\u00e0nh nghi\u00ean c\u1ee9u \u0111\u1eb7c \u0111i\u1ec3m t\u00e1i sinh c\u1ee7a Ch\u00f2 ch\u1ec9 d\u01b0\u1edbi t\u00e1n c\u00e2y m\u1eb9 k\u1ebft qu\u1ea3 cho \u1edf nh\u01b0 bi\u1ec3u 3<\/p>\n

Bi\u1ec3u 3. T\u00e1i sinh Ch\u00f2 ch\u1ec9 d\u01b0\u1edbi t\u00e1n c\u00e2y m\u1eb9<\/em><\/h4>\n\n\n\n\n\n\n\n
Kho\u1ea3ng c\u00e1ch<\/strong><\/p>\n

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

0 <\/strong>\u00b8<\/strong>1\u0110t<\/strong><\/td>\n1\u0110t <\/strong>\u00b8<\/strong>2\u0110t<\/strong><\/td>\n2\u0110t <\/strong>\u00b8<\/strong>3\u0110t<\/strong><\/td>\n<\/tr>\n
\n

S\u1ed1 c\u00e2y<\/h1>\n<\/td>\n

%<\/strong><\/td>\nS\u1ed1 c\u00e2y<\/strong><\/td>\n%<\/strong><\/td>\nS\u1ed1 c\u00e2y<\/strong><\/td>\n%<\/strong><\/td>\n<\/tr>\n
T\u1ed5ng s\u1ed1 c\u00e2y t\u00e1i sinh<\/td>\n8<\/td>\n33,33<\/td>\n12<\/td>\n50,0<\/td>\n4<\/td>\n16,67<\/td>\n<\/tr>\n
T\u1ed1t (Hvn \u00b31 m)<\/td>\n3<\/td>\n12,5<\/td>\n2<\/td>\n8,34<\/td>\n1<\/td>\n4,17<\/td>\n<\/tr>\n
X\u1ea5u(Hvn < 1m)<\/td>\n5<\/td>\n20,83<\/td>\n10<\/td>\n41,66<\/td>\n3<\/td>\n12,5<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

T\u00e1i sinh \u1edf kho\u1ea3ng c\u00e1ch (1\u0110t \u00b82\u0110t) <\/strong>chi\u1ebfm 50%. Cao g\u1ea5p 1,5 l\u1ea7n t\u00e1i sinh d\u01b0\u1edbi t\u00e1n c\u00e2y m\u1eb9 (0 \u00b81\u0110t) v\u00e0 g\u1ea5p 3 l\u1ea7n \u1edf kho\u1ea3ng c\u00e1ch (2\u0110t \u00b83\u0110t). K\u1ebft qu\u1ea3 tr\u00ean c\u00e0ng kh\u1eb3ng \u0111\u1ecbnh r\u00f5 Ch\u00f2 ch\u1ec9 t\u00e1i sinh theo c\u1ee5m, \u0111\u00e1m.<\/p>\n

2.5. K\u1ef9 thu\u1eadt gieo t\u1ea1o c\u00e2y con t\u1eeb h\u1ea1t <\/strong><\/p>\n

a. Th\u1eddi v\u1ee5 thu h\u00e1i, b\u1ea3o qu\u1ea3n, ch\u1ebf bi\u1ebfn h\u1ea1t gi\u1ed1ng.<\/em><\/p>\n

Qu\u1ea3 Ch\u00f2 ch\u1ec9 ch\u00edn t\u1eeb kho\u1ea3ng 15 th\u00e1ng 7 \u0111\u1ebfn 15 th\u00e1ng 8. Th\u1eddi gian ch\u00edn l\u00e0 15 ng\u00e0y. Qu\u1ea3 r\u1ee5ng sau 1\u00b83 ng\u00e0y l\u00e0 h\u1ea1t n\u1ea3y m\u1ea7m. Qu\u1ea3 thu ho\u1ea1ch v\u1ec1 ph\u1ea3i \u0111\u01b0\u1ee3c b\u1ea3o qu\u1ea3n \u1ea9m. Th\u1eddi gian b\u1ea3o qu\u1ea3n t\u1ed1t nh\u1ea5t l\u00e0 t\u1eeb 1\u00b85 ng\u00e0y. Qu\u1ea3 c\u00f3 v\u1ecf m\u1ecfng, khi h\u1ea1t n\u1ee9t nanh v\u1ecf qu\u1ea3 t\u1ef1 t\u00e1ch, do v\u1eady kh\u00f4ng c\u1ea7n ch\u1ebf bi\u1ebfn t\u1eeb qu\u1ea3 sang h\u1ea1t.<\/p>\n

b. K\u1ef9 thu\u1eadt t\u1ea1o c\u00e2y con <\/em><\/h5>\n

Qu\u1ea3 Ch\u00f2 ch\u1ec9 c\u00f3 tr\u1ecdng l\u01b0\u1ee3ng 1000 qu\u1ea3 = 3,53 kg. M\u1ed7i qu\u1ea3 c\u00f3 t\u1eeb 3 \u00b85 h\u1ea1t, 1kg qu\u1ea3 \u1ee7 v\u00e0o c\u00e1t \u1ea9m sau 3 ng\u00e0y \u0111\u01b0\u1ee3c 420 m\u1ea7m. T\u1ef7 l\u1ec7 n\u1ea3y m\u1ea7m \u0111\u1ea1t 49,3%. Th\u1ebf n\u1ea3y m\u1ea7m b\u1eb1ng 38,2% t\u1ef7 l\u1ec7 n\u1ea3y m\u1ea7m. H\u1ea1t n\u1ea3y m\u1ea7m \u0111\u01b0\u1ee3c c\u1ea5y v\u00e0o b\u1ea7u \u0111\u00f3ng tr\u01b0\u1edbc \u1edf b\u1ec3 \u01b0\u01a1m n\u1ec1n c\u1ee9ng.<\/p>\n

c. \u1ea3nh h\u01b0\u1edfng c\u1ee7a ch\u1ebf \u0111\u1ed9 che s\u00e1ng \u0111\u1ebfn sinh tr\u01b0\u1edfng c\u00e2y con <\/em><\/p>\n

Nghi\u00ean c\u1ee9u v\u1ec1 sinh tr\u01b0\u1edfng c\u1ee7a c\u00e2y con d\u01b0\u1edbi c\u00e1c \u0111\u1ed9 t\u00e0n che 0%, 25%, 50%, 75%, v\u00e0 100% cho th\u1ea5y Ch\u00f2 ch\u1ec9 sinh tr\u01b0\u1edfng v\u1ec1 chi\u1ec1u cao t\u1ed1t nh\u1ea5t \u1edf \u0111\u1ed9 t\u00e0n che 50%. \u0110\u1ed9 t\u00e0n che ch\u01b0a c\u00f3 \u1ea3nh h\u01b0\u1edfng r\u00f5 r\u1ec7t \u0111\u1ebfn sinh tr\u01b0\u1edfng \u0111\u01b0\u1eddng k\u00ednh g\u1ed1c c\u1ee7a c\u00e2y con.<\/p>\n

d. \u1ea3nh h\u01b0\u1edfng c\u1ee7a ph\u00e2n b\u00f3n \u0111\u1ebfn sinh tr\u01b0\u1edfng c\u00e2y con<\/em><\/p>\n

Trong t\u1ed5ng s\u1ed1 9 c\u00f4ng th\u1ee9c th\u00ed nghi\u1ec7m v\u1ec1 ph\u00e2n b\u00f3n th\u00ec c\u00f4ng th\u1ee9c c\u00f3 h\u1ed7n h\u1ee3p ru\u1ed9t b\u1ea7u 94% \u0111\u1ea5t t\u1ea7ng m\u1eb7t + 5% ph\u00e2n chu\u1ed3ng \u1ee7 hoai + 1% ph\u00e2n l\u00e2n l\u00e0 t\u1ed1t nh\u1ea5t cho sinh tr\u01b0\u1edfng c\u1ee7a c\u00e2y con trong giai \u0111o\u1ea1n v\u01b0\u1eddn \u01b0\u01a1m.<\/p>\n

e. K\u1ef9 thu\u1eadt ch\u0103m s\u00f3c c\u00e2y con<\/em><\/p>\n

C\u00e2y con \u0111\u01b0\u1ee3c gieo t\u1ea1o \u1edf b\u1ec3 \u01b0\u01a1m n\u1ec1n c\u1ee9ng, t\u00fai b\u1ea7u b\u1eb1ng Polyetylen c\u00f3 k\u00edch th\u01b0\u1edbc f= 7cm, H = 17cm. C\u00e2y con trong v\u01b0\u1eddn \u01b0\u01a1m \u0111\u01b0\u1ee3c t\u01b0\u1edbi th\u1ea5m, tu\u1ef3 th\u1eddi ti\u1ebft, kho\u1ea3ng 2\u00b86 ng\u00e0y t\u01b0\u1edbi m\u1ed9t l\u1ea7n. M\u1ed7i th\u00e1ng nh\u1ed5 c\u1ecf, ph\u00e1 v\u00e1ng m\u1ed9t l\u1ea7n. Trong giai \u0111o\u1ea1n v\u01b0\u1eddn \u01b0\u01a1m, Ch\u00f2 ch\u1ec9 hay b\u1ecb b\u1ecd que \u0103n l\u00e1, r\u1ebf c\u1eafn ngang th\u00e2n, s\u00e2u cu\u1ed1n l\u00e1, do v\u1eady ph\u1ea3i \u0111\u1ecbnh k\u1ef3 h\u00e0ng th\u00e1ng phun ph\u00f2ng cho c\u00e2y.<\/p>\n

f. C\u00e2y con xu\u1ea5t v\u01b0\u1eddn <\/em><\/p>\n

C\u00e2y con gieo \u1edf v\u01b0\u1eddn \u01b0\u01a1m, v\u1edbi c\u00e1c bi\u1ec7n ph\u00e1p k\u1ef9 thu\u1eadt tr\u00ean, sau 9 th\u00e1ng tu\u1ed5i \u0111\u1ea1t chi\u1ec1u cao trung b\u00ecnh \u00b342cm, \u0111\u01b0\u1eddng k\u00ednh g\u1ed1c \u0111\u1ea1t 4,6mm. C\u00e2y con ph\u00e1t tri\u1ec3n c\u00e2n \u0111\u1ed1i gi\u1eefa \u0111\u01b0\u1eddng k\u00ednh v\u00e0 chi\u1ec1u cao, l\u00fac n\u00e0y c\u00e2y \u0111\u01b0\u1ee3c xu\u1ea5t v\u01b0\u1eddn \u0111em tr\u1ed3ng r\u1eebng. V\u1edbi c\u00e1c ch\u1ec9 ti\u00eau nh\u01b0 tr\u00ean c\u00e2y con \u0111em tr\u1ed3ng r\u1eebng \u0111\u1ea1t t\u1ef7 l\u1ec7 s\u1ed1ng cao.<\/p>\n

2.6. Sinh tr\u01b0\u1edfng c\u1ee7a Ch\u00f2 ch\u1ec9 \u1edf r\u1eebng tr\u1ed3ng <\/strong><\/p>\n

Ch\u00f2 ch\u1ec9 tr\u1ed3ng thu\u1ea7n lo\u00e0i tr\u00ean \u0111\u1ea5t Feralit \u0111\u1ecf n\u00e2u, d\u1ed1c t\u1ee5 d\u01b0\u1edbi ch\u00e2n n\u00fai \u0111\u00e1 v\u00f4i c\u00f3 k\u1ebft qu\u1ea3 nh\u01b0 \u1edf bi\u1ec3u 4<\/p>\n

Bi\u1ec3u 4. Sinh tr\u01b0\u1edfng c\u1ee7a Ch\u00f2 ch\u1ec9 \u1edf r\u1eebng tr\u1ed3ng 27 tu\u1ed5i<\/em><\/h3>\n\n\n\n\n\n\n\n\n
Ch\u1ec9 ti\u00eau<\/strong><\/td>\nD1,3<\/sub> (cm)<\/strong><\/td>\nHvn (m)<\/strong><\/td>\nDt (m)<\/strong><\/td>\n<\/tr>\n
Tr\u1ecb s\u1ed1 trung b\u00ecnh (X)<\/td>\n30,74<\/td>\n21,6<\/td>\n6,58<\/td>\n<\/tr>\n
Ph\u01b0\u01a1ng sai m\u1eabu (S2<\/sup>)<\/td>\n12,13<\/td>\n1,84<\/td>\n1,13<\/td>\n<\/tr>\n
Sai ti\u00eau chu\u1ea9n (S)<\/td>\n3,48<\/td>\n1,35<\/td>\n1,06<\/td>\n<\/tr>\n
H\u1ec7 s\u1ed1 bi\u1ebfn \u0111\u1ed9ng (S%)<\/td>\n11,32<\/td>\n6,24<\/td>\n16,11<\/td>\n<\/tr>\n
T\u0103ng tr\u01b0\u1edfng b\u00ecnh qu\u00e2n n\u0103m (D)<\/td>\n1,14<\/td>\n0,81<\/td>\n0,25<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

T\u0103ng tr\u01b0\u1edfng th\u01b0\u1eddng xuy\u00ean c\u1ee7a Ch\u00f2 ch\u1ec9 trong r\u1eebng tr\u1ed3ng \u1edf m\u1ee9c trung b\u00ecnh so v\u1edbi c\u00e1c lo\u00e0i c\u00e2y b\u1ea3n \u0111\u1ecba kh\u00e1c.<\/p>\n

3. K\u1ebft lu\u1eadn<\/h2>\n

3.1<\/strong>. Ch\u00f2 ch\u1ec9 l\u00e0 lo\u00e0i c\u00e2y g\u1ed7 l\u1edbn c\u00f3 th\u1ec3 \u0111\u1ea1t 200cm v\u1ec1 \u0111\u01b0\u1eddng k\u00ednh, 70m v\u1ec1 chi\u1ec1u cao, chi\u1ec1u cao d\u01b0\u1edbi c\u00e0nh b\u1eb1ng 3\/4 chi\u1ec1u cao c\u00e2y. Ch\u00f2 ch\u1ec9 ra hoa v\u00e0o th\u00e1ng 5\u20136, qu\u1ea3 ch\u00edn v\u00e0o th\u00e1ng 7\u20138, th\u1eddi gian qu\u1ea3 ch\u00edn l\u00e0 15 ng\u00e0y. Qu\u1ea3 Ch\u00f2 ch\u1ec9 c\u00f3 5 c\u00e1nh, khi ch\u00edn h\u1ea1t th\u01b0\u1eddng n\u1ea3y m\u1ea7m tr\u00ean c\u00e2y tr\u01b0\u1edbc khi r\u1ee5ng.<\/p>\n

3.2<\/strong>. T\u1ea1i C\u00fac Ph\u01b0\u01a1ng, Ch\u00f2 ch\u1ec9 ph\u00e2n b\u1ed1 kh\u00f4ng \u0111\u1ec1u m\u00e0 theo c\u1ee5m ho\u1eb7c \u0111\u00e1m, ch\u1ee7 y\u1ebfu \u1edf c\u00e1c thung, s\u01b0\u1eddn, \u0111\u1ec9nh \u0111\u1ed3i \u0111\u1ea5t (chi\u1ebfm 80,1%). S\u1ed1 c\u00f2n l\u1ea1i ph\u00e2n b\u1ed1 \u1edf thung \u0111\u00e1 l\u1eabn \u0111\u1ea5t.<\/p>\n

3.3<\/strong>. Ch\u00f2 ch\u1ec9 ph\u00e2n b\u1ed1 tr\u00ean \u0111\u1ea5t Feralit \u2013 Macgalit ph\u00e1t tri\u1ec3n tr\u00ean \u0111\u00e1 v\u00f4i ho\u1eb7c tr\u00ean s\u1ea3n ph\u1ea9m d\u1ed1c t\u1ee5 c\u1ee7a \u0111\u00e1 v\u00f4i v\u00e0 \u0111\u00e1 s\u00e9t n\u00e9n. T\u1ea7ng \u0111\u1ea5t d\u1ea7y, \u0111\u1ea5t \u00edt chua, h\u00e0m l\u01b0\u1ee3ng m\u00f9n kh\u00e1, c\u00e1c ch\u1ea5t d\u1ec5 ti\u00eau thu\u1ed9c lo\u1ea1i trung b\u00ecnh.<\/p>\n

3.4<\/strong>. Ch\u00f2 ch\u1ec9 th\u01b0\u1eddng m\u1ecdc t\u1ef1 nhi\u00ean v\u1edbi c\u00e1c lo\u00e0i c\u00e2y kh\u00e1c nh\u01b0 : Nh\u00f2 v\u00e0ng, \u00d4 r\u00f4, V\u00e0ng anh, S\u00e2ng, G\u1ed9i g\u00e1c v.v.t\u1ea1o th\u00e0nh r\u1eebng nhi\u1ec1u t\u1ea7ng th\u1ee9, trong \u0111\u00f3 Ch\u00f2 ch\u1ec9 l\u00e0 lo\u00e0i chi\u1ebfm \u01b0u th\u1ebf v\u1ec1 \u0111\u01b0\u1eddng k\u00ednh, chi\u1ec1u cao v\u00e0 di\u1ec7n t\u00edch t\u00e1n. Do v\u1eady Ch\u00f2 ch\u1ec9 c\u00f3 vai tr\u00f2 chi ph\u1ed1i m\u1ea1nh \u0111\u1ebfn sinh tr\u01b0\u1edfng v\u00e0 ph\u00e1t tri\u1ec3n c\u1ee7a l\u00e2m ph\u1ea7n.<\/p>\n

3.5<\/strong>. Ch\u00f2 ch\u1ec9 t\u00e1i sinh c\u00f3 d\u1ea1ng ph\u00e2n b\u1ed1 c\u1ee5m, s\u1ed1 c\u00e2y t\u00e1i sinh \/ha thu\u1ed9c lo\u1ea1i trung b\u00ecnh, t\u1ef7 l\u1ec7 c\u00e2y t\u00e1i sinh c\u00f3 tri\u1ec3n v\u1ecdng th\u1ea5p.<\/p>\n

3.6<\/strong>. H\u1ea1t Ch\u00f2 ch\u1ec9 c\u00f3 th\u1ebf n\u1ea3y m\u1ea7m v\u00e0 t\u1ef7 l\u1ec7 n\u1ea3y m\u1ea7m th\u1ea5p, c\u00e2y con trong giai \u0111o\u1ea1n v\u01b0\u1eddn \u01b0\u01a1m c\u1ea7n \u0111\u01b0\u1ee3c che b\u00f3ng. H\u1ed7n h\u1ee3p ru\u1ed9t b\u1ea7u c\u1ea7n c\u00f3 c\u1ea3 ph\u00e2n v\u00f4 c\u01a1 v\u00e0 ph\u00e2n h\u1eefu c\u01a1 v\u1edbi t\u1ef7 l\u1ec7 th\u00edch h\u1ee3p<\/p>\n

3.7.<\/strong>Ch\u00f2 ch\u1ec9 l\u00e0 lo\u00e0i c\u00e2y sinh tr\u01b0\u1edfng trung b\u00ecnh, trong giai \u0111o\u1ea1n \u0111\u1ea7u sinh tr\u01b0\u1edfng kh\u00f4ng \u0111\u1ec1u (sinh tr\u01b0\u1edfng v\u1ec1 chi\u1ec1u cao nhanh h\u01a1n v\u1ec1 \u0111\u01b0\u1eddng k\u00ednh). \u0110i\u1ec1u n\u00e0y ph\u00f9 h\u1ee3p v\u1edbi \u0111\u1eb7c \u0111i\u1ec3m c\u1ee7a Ch\u00f2 ch\u1ec9 l\u00e0 c\u00e2y \u01b0a s\u00e1ng ho\u00e0n to\u00e0n.<\/p>\n

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

1<\/strong>. Nguy\u1ec5n Ti\u1ebfn B\u00e2n (1965) \u2013 G\u00f3p ph\u1ea7n nghi\u00ean c\u1ee9u \u0111\u1eb7c \u0111i\u1ec3m c\u1ea5u tr\u00fac sinh th\u00e1i khu r\u1eebng C\u00fac Ph\u01b0\u01a1ng<\/p>\n

2<\/strong>. V\u0169 V\u0103n D\u0169ng, Nguy\u1ec5n H\u1eefu Hi\u1ebfn, L\u00ea V\u0103n Qu\u1ef3 (1972) – K\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u b\u01b0\u1edbc \u0111\u1ea7u v\u1ec1 h\u1ec7 th\u1ef1c v\u1eadt C\u00fac Ph\u01b0\u01a1ng<\/p>\n

3<\/strong>. Tri\u1ec7u V\u0103n H\u00f9ng (1993) – \u0110\u1eb7c t\u00ednh sinh v\u1eadt h\u1ecdc c\u1ee7a c\u00e1c lo\u00e0i c\u00e2y l\u00e0m gi\u1ea7u r\u1eebng (Tr\u1eafm tr\u00e1ng, lim x\u1eb9t ) \u0110\u1ea1i h\u1ecdc L\u00e2m nghi\u1ec7p – K\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u khoa h\u1ecdc (1990 – !994) \u2013 NXB N\u00f4ng nghi\u1ec7p<\/p>\n

4<\/strong>. V\u0169 Ti\u1ebfn Hinh (1986) – Ph\u01b0\u01a1ng ph\u00e1p b\u1ed1 tr\u00ed th\u00ed nghi\u1ec7m v\u00e0 ph\u00e2n t\u00edch k\u1ebft qu\u1ea3 – \u0110\u1ea1i h\u1ecdc L\u00e2m nghi\u1ec7p<\/p>\n

5<\/strong>. Phan K\u1ebf L\u1ed9c (1986) – M\u1ed9t s\u1ed1 d\u1eabn li\u1ec7u v\u1ec1 c\u1ea5u tr\u00fac h\u1ec7 th\u1ed1ng c\u1ee7a h\u1ec7 th\u1ef1c v\u1eadt C\u00fac Ph\u01b0\u01a1ng \u2013 T\u1ea1p ch\u00ed sinh h\u1ecdc t\u1eadp 8 s\u1ed1 2 trang 1 \u2013 8<\/p>\n

6<\/strong>. Th\u00e1i v\u0103n Tr\u1eebng (1978) \u2013 Th\u1ea3m th\u1ef1c v\u1eadt r\u1eebng Vi\u1ec7t Nam tr\u00ean quan \u0111i\u1ec3m h\u1ec7 sinh th\u00e1i \u2013 NXB Khoa h\u1ecdc k\u1ef9 thu\u1eadt, t\u1eadp I, II, III, IV, V.<\/p>\n

Summary<\/strong><\/p>\n

Parashorea chinensis<\/em>Wang is the timber species, which is normally used for construction and household commodities. Currently, only few plants exist in the natural forests. Parashorea chinensis<\/em> Wang is obviously in danger of extinction. Various studies of biological characteristics of the plants are the basis for proposing technical solutions to provide information on forestation and enrichment of forest by Parashorea chinensis<\/em> Wang on those places impacted by Carbonate Calcium.<\/p>\n","protected":false},"excerpt":{"rendered":"

Nghiên c\u1ee9u m\u1ed9t s\u1ed1 \u0111\u1eb7c \u0111I\u1ec3m sinh v\u1eadt h\u1ecdc c\u1ee7a cây Chò ch\u1ec9 làm c\u01a1 s\u1edf cho vi\u1ec7c phát tri\u1ec3n loài cây này \u1edf v\u01b0\u1eddn qu\u1ed1c gia Cúc Ph\u01b0\u01a1ng V\u01b0\u1eddn qu\u1ed1c gia Cúc Ph\u01b0\u01a1ng n\u1eb1m trên to\u1ea1 \u0111\u1ed9 \u0111\u1ecba lý t\u1eeb 20014’ \u0111\u1ebfn 20024’ v\u0129 \u0111\u1ed9 B\u1eafc và t\u1eeb 1050 29’ \u0111\u1ebfn 1050 44’ kinh \u0111\u1ed9 \u0110ông.V\u01b0\u1eddn có t\u1ed5ng di\u1ec7n tích 22 200ha trong \u0111ó 3\/4 di\u1ec7n tích Cúc Ph\u01b0\u01a1ng là núi \u0111á vôi, có \u0111\u1ed9 cao tuy\u1ec7t \u0111\u1ed1i trung bình 300 – 400m. Cúc Ph\u01b0\u01a1ng có khí h\u1eadu nhi\u1ec7t \u0111\u1edbi gió mùa. Nhi\u1ec7t \u0111\u1ed9 trung bình n\u0103m 20,60C, \u0111\u1ed9 \u1ea9m trung bình 90%, t\u1ed5ng l\u01b0\u1ee3ng m\u01b0a trung bình 2138 mm\/n\u0103m. Th\u1ea3m th\u1ef1c v\u1eadt \u1edf \u0111ây là r\u1eebng m\u01b0a nhi\u1ec7t \u0111\u1edbi th\u01b0\u1eddng xanh. Cúc Ph\u01b0\u01a1ng là n\u01a1i r\u1ea5t \u0111a d\u1ea1ng v\u1ec1 c\u1ea5u trúc t\u1ed5 thành loài trong h\u1ec7 th\u1ef1c v\u1eadt. Hi\u1ec7n t\u1ea1i Cúc Ph\u01b0\u01a1ng là n\u01a1i phân b\u1ed1 c\u1ee7a nhi\u1ec1u loài cây g\u1ed7 quý hi\u1ebfm có ghi trong sách \u0111\u1ecf th\u1ef1c v\u1eadt Vi\u1ec7t Nam.. Chò ch\u1ec9 là loài cây g\u1ed7 l\u1edbn (có trong sách \u0111\u1ecf th\u1ef1c v\u1eadt). Do vi\u1ec7c khai thác không b\u1ea3o v\u1ec7, hi\u1ec7n t\u1ea1i \u1edf Cúc Ph\u01b0\u01a1ng và các n\u01a1i khác Chò ch\u1ec9 còn l\u1ea1i r\u1ea5t ít. Do v\u1eady vi\u1ec7c khôi ph\u1ee5c l\u1ea1i r\u1eebng Chò ch\u1ec9 là c\u1ea7n thi\u1ebft. <\/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\/8739"}],"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=8739"}],"version-history":[{"count":2,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/posts\/8739\/revisions"}],"predecessor-version":[{"id":19092,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/posts\/8739\/revisions\/19092"}],"wp:attachment":[{"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/media?parent=8739"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/categories?post=8739"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/tags?post=8739"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}