{"id":9059,"date":"2009-04-20T08:24:48","date_gmt":"2009-04-20T01:24:48","guid":{"rendered":"http:\/\/vafs.gov.vn\/vn\/2009\/04\/nghien-cuu-co-so-khoa-hoc-xac-dinh-the-tich-go-duoi-canh-than-cay-dung-loai-lim-xanh-erythrophleum-fordii-va-tau-mat-vatica-odorata-ssp-tonkinensis\/"},"modified":"2013-10-06T09:01:14","modified_gmt":"2013-10-06T02:01:14","slug":"nghien-cuu-co-so-khoa-hoc-xac-dinh-the-tich-go-duoi-canh-than-cay-dung-loai-lim-xanh-erythrophleum-fordii-va-tau-mat-vatica-odorata-ssp-tonkinensis","status":"publish","type":"post","link":"https:\/\/vafs.gov.vn\/vn\/nghien-cuu-co-so-khoa-hoc-xac-dinh-the-tich-go-duoi-canh-than-cay-dung-loai-lim-xanh-erythrophleum-fordii-va-tau-mat-vatica-odorata-ssp-tonkinensis\/","title":{"rendered":"Nghi\u00ean c\u1ee9u c\u01a1 s\u1edf khoa h\u1ecdc x\u00e1c \u0111\u1ecbnh th\u1ec3 t\u00edch g\u1ed7 d\u01b0\u1edbi c\u00e0nh th\u00e2n c\u00e2y \u0111\u1ee9ng lo\u00e0i Lim xanh (Erythrophleum fordii) v\u00e0 T\u00e1u m\u1eadt (Vatica odorata ssp tonkinensis)"},"content":{"rendered":"\n

Ph\u1ea1m Th\u1ebf Anh<\/strong> <\/p>\n

Tr\u01b0\u1eddng \u0110\u1ea1i h\u1ecdc L\u00e2m nghi\u1ec7p, Xu\u00e2n Mai, H\u00e0 N\u1ed9i<\/em><\/em><\/strong> <\/p>\n

T\u00d3M T\u1eaeT<\/strong> <\/p>\n

<\/strong>T\u1eeb t\u00e0i li\u1ec7u 201 c\u00e2y ng\u1ea3, b\u1eb1ng ph\u01b0\u01a1ng ph\u00e1p nghi\u00ean c\u1ee9u th\u00f4ng d\u1ee5ng trong \u0111i\u1ec1u tra r\u1eebng \u0111\u00e3 ph\u00e1t hi\u1ec7n v\u00e0 x\u00e1c l\u1eadp m\u1ed9t s\u1ed1 quy lu\u1eadt k\u1ebft c\u1ea5u v\u1ec1 h\u00ecnh d\u1ea1ng, k\u00edch th\u01b0\u1edbc \u0111o\u1ea1n g\u1ed7 d\u01b0\u1edbi c\u00e0nh cho hai lo\u00e0i c\u00e2y Lim xanh v\u00e0 T\u00e1u m\u1eadt. T\u1eeb \u0111\u00f3 \u0111\u00e3 \u0111\u1ec1 xu\u1ea5t 3 ph\u01b0\u01a1ng ph\u00e1p \u0111i\u1ec1u tra th\u1ec3 t\u00edch g\u1ed7 d\u01b0\u1edbi c\u00e0nh cho \u0111\u1ed1i t\u01b0\u1ee3ng nghi\u00ean c\u1ee9u v\u1edbi k\u1ebft qu\u1ea3 ki\u1ec3m nghi\u1ec7m b\u01b0\u1edbc \u0111\u1ea7u \u0111\u00e1p \u1ee9ng y\u00eau c\u1ea7u c\u1ee7a th\u1ef1c ti\u1ec5n hi\u1ec7n nay. <\/p>\n

T\u1eeb kho\u00e1: <\/strong>Lim xanh, T\u00e1u m\u1eadt, th\u1ec3 t\u00edch g\u1ed7 <\/p>\n

\u0110\u1eb6T V\u1ea4N \u0110\u1ec0<\/strong> <\/p>\n

\u0110o\u1ea1n g\u1ed7 d\u01b0\u1edbi c\u00e0nh l\u00e0 b\u1ed9 ph\u1eadn th\u00e2n c\u00e2y t\u00ednh t\u1eeb m\u1eb7t \u0111\u1ea5t (c\u1ed5 r\u1ec5 c\u00e2y) \u0111\u1ebfn c\u00e0nh s\u1ed1ng th\u1ea5p nh\u1ea5t tham gia t\u1ea1o n\u00ean t\u00e1n ch\u00ednh c\u1ee7a c\u00e2y g\u1ed7. G\u1ed7 d\u01b0\u1edbi c\u00e0nh th\u01b0\u1eddng chi\u1ebfm \u226570% th\u1ec3 t\u00edch th\u00e2n c\u00e2y v\u00e0 \u226580% th\u1ec3 t\u00edch g\u1ed7 tr\u00f2n m\u00e0 m\u1ed9t c\u00e2y l\u00e1 r\u1ed9ng trong r\u1eebng t\u1ef1 nhi\u00ean c\u00f3 th\u1ec3 t\u1ea1o ra. \u0110\u1ec3 x\u00e1c \u0111\u1ecbnh th\u1ec3 t\u00edch th\u00e2n c\u00e2y d\u01b0\u1edbi c\u00e0nh r\u1eebng t\u1ef1 nhi\u00ean (trong \u0111\u00f3 c\u00f3 Lim xanh v\u00e0 T\u00e1u m\u1eadt) hi\u1ec7n nay c\u00f3 th\u1ec3 d\u00f9ng ph\u01b0\u01a1ng ph\u00e1p sau \u0111\u00e2y: <\/p>\n

\u0110o \u0111\u01b0\u1eddng k\u00ednh ngang ng\u1ef1c v\u00e0 chi\u1ec1u cao v\u00fat ng\u1ecdn, t\u1eeb \u0111\u00f3 tra bi\u1ec3u th\u1ec3 t\u00edch 2 nh\u00e2n t\u1ed1 t\u01b0\u01a1ng \u1ee9ng v\u1edbi lo\u00e0i s\u1ebd \u0111\u01b0\u1ee3c th\u1ec3 t\u00edch th\u00e2n c\u00e2y. Nh\u00e2n th\u1ec3 t\u00edch th\u00e2n c\u00e2y v\u1edbi t\u1ef7 su\u1ea5t g\u1ed7 d\u01b0\u1edbi c\u00e0nh s\u1ebd \u0111\u01b0\u1ee3c th\u1ec3 t\u00edch g\u1ed7 d\u01b0\u1edbi c\u00e0nh c\u1ea7n t\u00ecm (s\u1ed5 tay \u0110TQH ho\u1ea1ch r\u1eebng 1995). Ph\u01b0\u01a1ng ph\u00e1p n\u00e0y tuy t\u01b0\u01a1ng \u0111\u1ed1i \u0111\u01a1n gi\u1ea3n nh\u01b0ng khi s\u1eed d\u1ee5ng g\u1eb7p m\u1ed9t s\u1ed1 tr\u1edf ng\u1ea1i sau: <\/p>\n

u Trong r\u1eebng t\u1ef1 nhi\u00ean kh\u00f3 \u0111o ch\u00ednh x\u00e1c chi\u1ec1u cao v\u00fat ng\u1ecdn th\u00e2n c\u00e2y v\u00ec kh”ng nh\u00ecn r\u00f5 \u0111\u1ec9nh sinh tr\u01b0\u1edfng chi\u1ec1u cao (ng\u1ecdn c\u00e2y) v\u00e0 b\u1ed9 ph\u1eadn th\u00e2n c\u00e2y trong t\u00e1n \u00edt khi h\u00ecnh th\u00e0nh tr\u1ee5c ch\u00ednh, \u0111\u1eb7c bi\u1ec7t v\u1edbi c\u00e1c lo\u00e0i c\u00e2y l\u00e1 r\u1ed9ng. T\u1eeb \u0111\u00f3 th\u1ec3 t\u00edch th\u00e2n c\u00e2y tra \u0111\u01b0\u1ee3c qua bi\u1ec3u kh”ng \u0111\u1ea3m b\u1ea3o \u0111\u1ed9 tin c\u1ea7n thi\u1ebft. <\/p>\n

v T\u1ef7 su\u1ea5t th\u1ec3 t\u00edch g\u1ed7 d\u01b0\u1edbi c\u00e0nh \u0111\u01b0\u1ee3c c\u00f4ng b\u1ed1 m\u1edbi l\u00e0 tr\u1ecb s\u1ed1 trung b\u00ecnh gi\u1ea3n \u0111\u01a1n \u0111\u01b0\u1ee3c t\u00ednh t\u1eeb t\u00e0i li\u1ec7u th\u1ef1c nghi\u1ec7m c\u00f3 h\u1ea1n v\u00e0 ng\u01b0\u1eddi s\u1eed d\u1ee5ng ch\u01b0a nh\u1eadn \u0111\u01b0\u1ee3c khuy\u1ebfn c\u00e1o c\u1ea7n thi\u1ebft. <\/p>\n

w Th\u1ef1c ti\u1ec5n \u0111o c\u00e2y cho th\u1ea5y x\u00e1c \u0111\u1ecbnh th\u1ec3 t\u00edch g\u1ed7 d\u01b0\u1edbi c\u00e0nh \u1edf c\u00e2y \u0111\u1ee9ng lu\u00f4n d\u1ec5 d\u00e0ng v\u00e0 \u0111\u1ea1t \u0111\u1ed9 ch\u00ednh x\u00e1c cao h\u01a1n x\u00e1c \u0111\u1ecbnh th\u1ec3 t\u00edch th\u00e2n c\u00e2y \u0111\u1ee9ng. V\u00ec v\u1eady c\u00e1ch l\u00e0m n\u00e0y kh\u00f4ng ph\u00f9 h\u1ee3p v\u1edbi logic bi\u1ec7n ch\u1ee9ng trong \u0111i\u1ec1u tra r\u1eebng l\u00e0: t\u00ecm \u0111\u1ea1i l\u01b0\u1ee3ng kh\u00f3 x\u00e1c \u0111\u1ecbnh ho\u1eb7c kh\u00f4ng x\u00e1c \u0111\u1ecbnh \u0111\u01b0\u1ee3c d\u1ec5 d\u00e0ng th\u00f4ng qua m\u1ed9t s\u1ed1 \u0111\u1ea1i l\u01b0\u1ee3ng d\u1ec5 \u0111o ch\u00ednh x\u00e1c h\u01a1n. <\/p>\n

C\u1eadp nh\u1eadt t\u1ea1i \u0111\u00e2y <\/a><\/strong> <\/p>\n","protected":false},"excerpt":{"rendered":"

\n \n<\/p>\n

\nT\u1eeb tài li\u1ec7u 201 cây ng\u1ea3, b\u1eb1ng ph\u01b0\u01a1ng pháp nghiên c\u1ee9u thông d\u1ee5ng trong \u0111i\u1ec1u tra r\u1eebng \u0111ã phát hi\u1ec7n và xác l\u1eadp m\u1ed9t s\u1ed1 quy lu\u1eadt k\u1ebft c\u1ea5u v\u1ec1 hình d\u1ea1ng, kích th\u01b0\u1edbc \u0111o\u1ea1n g\u1ed7 d\u01b0\u1edbi cành cho hai loài cây Lim xanh và Táu m\u1eadt. T\u1eeb \u0111ó \u0111ã \u0111\u1ec1 xu\u1ea5t 3 ph\u01b0\u01a1ng pháp \u0111i\u1ec1u tra th\u1ec3 tích g\u1ed7 d\u01b0\u1edbi cành cho \u0111\u1ed1i t\u01b0\u1ee3ng nghiên c\u1ee9u v\u1edbi k\u1ebft qu\u1ea3 ki\u1ec3m nghi\u1ec7m b\u01b0\u1edbc \u0111\u1ea7u \u0111áp \u1ee9ng yêu c\u1ea7u c\u1ee7a th\u1ef1c ti\u1ec5n hi\u1ec7n nay.<\/font><\/span><\/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\/9059"}],"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=9059"}],"version-history":[{"count":1,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/posts\/9059\/revisions"}],"predecessor-version":[{"id":10513,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/posts\/9059\/revisions\/10513"}],"wp:attachment":[{"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/media?parent=9059"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/categories?post=9059"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/tags?post=9059"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}