{"id":13198,"date":"2014-07-15T14:47:21","date_gmt":"2014-07-15T07:47:21","guid":{"rendered":"http:\/\/vafs.gov.vn\/vn\/?p=13198"},"modified":"2014-07-04T15:10:07","modified_gmt":"2014-07-04T08:10:07","slug":"bao-cao-tom-tat-de-tai-nghien-cuu-cac-bien-phap-ky-thuat-bao-ve-va-nang-cao-do-phi-cua-dat-nham-nang-cao-nang-suat-rung-trong-bach-dan-keo-o-cac-luan-ky-sau","status":"publish","type":"post","link":"https:\/\/vafs.gov.vn\/vn\/bao-cao-tom-tat-de-tai-nghien-cuu-cac-bien-phap-ky-thuat-bao-ve-va-nang-cao-do-phi-cua-dat-nham-nang-cao-nang-suat-rung-trong-bach-dan-keo-o-cac-luan-ky-sau\/","title":{"rendered":"B\u00e1o c\u00e1o t\u00f3m t\u1eaft \u0111\u1ec1 t\u00e0i: Nghi\u00ean c\u1ee9u c\u00e1c bi\u1ec7n ph\u00e1p k\u1ef9 thu\u1eadt b\u1ea3o v\u1ec7 v\u00e0 n\u00e2ng cao \u0111\u1ed9 ph\u00ec c\u1ee7a \u0111\u1ea5t nh\u1eb1m n\u00e2ng cao n\u0103ng su\u1ea5t r\u1eebng tr\u1ed3ng b\u1ea1ch \u0111\u00e0n, keo \u1edf c\u00e1c lu\u00e2n k\u1ef3 sau"},"content":{"rendered":"<p><em>TS. Ph\u1ea1m Th\u1ebf D\u0169ng<\/em><\/p>\n<p><b>I. <\/b><b>\u0110\u1eb6T V\u1ea4N \u0110\u1ec0 &#8211; T\u1ed4NG QUAN C\u00c1C NGHI\u00caN C\u1ee8U<\/b><\/p>\n<ul>\n<li>B\u1ea1ch \u0111\u00e0n v\u00e0 keo \u0111ang l\u00e0 c\u00e2y ch\u1ee7 l\u1ef1c trong tr\u1ed3ng c\u00f4ng nghi\u1ec7p, chi\u1ebfm t\u1edbi 46% t\u1ed5ng di\u1ec7n t\u00edch r\u1eebng tr\u1ed3ng v\u00e0 c\u00f3 xu h\u01b0\u1edbng t\u0103ng.<\/li>\n<li>Khuynh h\u01b0\u1edbng suy gi\u1ea3m n\u0103ng su\u1ea5t r\u1eebng sau nhi\u1ec1u chu k\u1ef3 kinh doanh \u0111\u00e3 \u0111\u01b0\u1ee3c quan t\u00e2m nghi\u00ean c\u1ee9u \u1edf nhi\u1ec1u n\u01b0\u1edbc tr\u00ean th\u1ebf gi\u1edbi.<\/li>\n<li>Qu\u1ea3n l\u00fd h\u1ee3p l\u00fd v\u1eadt li\u1ec7u h\u1eefu c\u01a1 sau khai th\u00e1c, ki\u1ec3m so\u00e1t th\u1ea3m th\u1ef1c b\u00ec v\u00e0 s\u1eed d\u1ee5ng ph\u00e2n b\u00f3n ph\u00f9 h\u1ee3p \u0111\u00e3 c\u00f3 t\u00e1c d\u1ee5ng t\u00edch c\u1ef1c \u0111\u1ebfn \u0111\u1ed9 ph\u00ec \u0111\u1ea5t v\u00e0 n\u0103ng su\u1ea5t r\u1eebng tr\u1ed3ng (Nambiar, 1996).<\/li>\n<li>Qu\u1ea3n l\u00fd h\u1ee3p l\u00fd v\u1eadt li\u1ec7u h\u1eefu c\u01a1 sau khai th\u00e1c, ki\u1ec3m so\u00e1t th\u1ea3m th\u1ef1c b\u00ec v\u00e0 s\u1eed d\u1ee5ng ph\u00e2n b\u00f3n ph\u00f9 h\u1ee3p \u0111\u00e3 c\u00f3 t\u00e1c d\u1ee5ng t\u00edch c\u1ef1c \u0111\u1ebfn \u0111\u1ed9 ph\u00ec \u0111\u1ea5t v\u00e0 n\u0103ng su\u1ea5t r\u1eebng tr\u1ed3ng (Nambiar, 1996).<\/li>\n<\/ul>\n<p>\u0097\u00a0 N\u0103m 2002, Vi\u1ec7n KHLN v\u00e0 Trung t\u00e2m Nghi\u00ean c\u1ee9u L\u00e2m nghi\u1ec7p Qu\u1ed1c t\u1ebf (CIFOR) th\u1ef1c hi\u1ec7n d\u1ef1 \u00e1n: \u201cQu\u1ea3n l\u00fd l\u1eadp \u0111\u1ecba v\u00e0 n\u0103ng su\u1ea5t r\u1eebng tr\u1ed3ng Nhi\u1ec7t \u0111\u1edbi\u201d, t\u1ea1i ph\u00eda Nam. K\u1ebft qu\u1ea3 b\u01b0\u1edbc \u0111\u1ea7u cho th\u1ea5y \u0111\u1ec3 l\u1ea1i v\u1eadt li\u1ec7u h\u1eefu c\u01a1 sau khai th\u00e1c (VLHCSKT) \u0111\u00e3 c\u1ea3i thi\u1ec7n \u0111\u1ed9 ph\u00ec \u0111\u1ea5t v\u00e0 n\u0103ng su\u1ea5t r\u1eebng tr\u1ed3ng Keo l\u00e1 tr\u00e0m l\u00ean r\u00f5 r\u1ec7t.<\/p>\n<p>\u0097\u00a0 \u0110\u1ec3 m\u1edf r\u1ed9ng nghi\u00ean c\u1ee9u tr\u00ean c\u00e1c d\u1ea1ng l\u1eadp \u0111\u1ecba, cho c\u00e1c lo\u00e0i c\u00e2y tr\u1ed3ng r\u1eebng ch\u1ee7 l\u1ef1c, n\u0103m 2008 B\u1ed9 NN&amp;PTNT \u0111\u00e3 ph\u00ea duy\u1ec7t th\u1ef1c hi\u1ec7n \u0111\u1ec1 t\u00e0i \u201c<b><i>Nghi\u00ean c\u1ee9u c\u00e1c bi\u1ec7n ph\u00e1p k\u1ef9 thu\u1eadt b\u1ea3o v\u1ec7 v\u00e0 n\u00e2ng cao \u0111\u1ed9 ph\u00ec c\u1ee7a \u0111\u1ea5t nh\u1eb1m n\u00e2ng cao n\u0103ng su\u1ea5t r\u1eebng tr\u1ed3ng b\u1ea1ch \u0111\u00e0n, keo \u1edf c\u00e1c lu\u00e2n k\u1ef3 sau\u201d<\/i><\/b><\/p>\n<p><a href=\"http:\/\/vafs.gov.vn\/vn\/2014\/07\/bao-cao-tom-tat-de-tai-nghien-cuu-cac-bien-phap-ky-thuat-bao-ve-va-nang-cao-do-phi-cua-dat-nham-nang-cao-nang-suat-rung-trong-bach-dan-keo-o-cac-luan-ky-sau\/bachdanxanh3\/\" rel=\"attachment wp-att-13201\"><img decoding=\"async\" loading=\"lazy\" class=\"aligncenter size-full wp-image-13201\" alt=\"bachdanxanh3\" src=\"http:\/\/vafs.gov.vn\/vn\/wp-content\/uploads\/sites\/2\/2014\/07\/bachdanxanh3.jpg\" width=\"341\" height=\"455\" \/><\/a><\/p>\n<p><b>C\u00e1c NC \u1edf n\u01b0\u1edbc ngo\u00e0i<\/b><\/p>\n<p>NC c\u1ee7a Nambiar (1996) v\u00e0 Sands (1983) \u1edf \u00dac v\u1edbi lo\u00e0i th\u00f4ng <i>Pinus radiata.<\/i> NC c\u1ee7a Ghosh ,1978 \u1edf \u1ea4n \u0111\u1ed9.NC c\u1ee7a Nabiar v\u00e0 Brown ,1997 .NC c\u1ee7a J.L.M Goncalves v\u00e0 c\u1ed9ng s\u1ef1 cho B\u1ea1ch \u0111\u00e0n \u1edf Brazil, 1999. NC c\u1ee7a J.P. Bouillet v\u00e0 c\u1ed9ng s\u1ef1 cho B\u1ea1ch \u0111\u00e0n \u1edf C\u00f4ng g\u00f4.NC c\u1ee7a B.du Toil v\u00e0 c\u1ed9ng s\u1ef1 cho c\u00e2y b\u1ea1ch \u0111\u00e0n \u1edf Nam Phi, 1999. NC c\u1ee7a D.P. Xu v\u00e0 c\u1ed9ng s\u1ef1 cho b\u1ea1ch \u0111\u00e0n ur\u00f4 \u1edf Trung Qu\u1ed1c, 1999. NC c\u1ee7a E.B.<\/p>\n<p>Hardiyanto v\u00e0 c\u1ed9ng s\u1ef1 cho A. mangium \u01a1 Indoneshia, 1999. NC c\u1ee7a K.C Chacko cho b\u1ea1ch \u0111\u00e0n \u1edf \u1ea4n \u0111\u1ed9, 1999. NC c\u1ee7a J.A Simpson cho th\u00f4ng \u1edf Australia, 1999. NC c\u1ee7a C.K.Mok v\u00e0 c\u1ed9ng s\u1ef1 cho A.mangium \u01a1 Indoneshia. NC c\u1ee7a J.P. Laclau v\u00e0 c\u1ed9ng s\u1ef1 v\u1ec1\u00a0 dinh d\u01b0\u1ee1ng c\u1ee7a b\u1ea1ch \u0111\u00e0n t\u1ea1i C\u00f4ng g\u00f4. NC c\u1ee7a A.Tiarks v\u00e0 c\u1ed9ng s\u1ef1 v\u1ec1 r\u1eebng th\u00f4ng \u1edf M\u1ef9.<\/p>\n<p>T\u1ea5t c\u1ea3 nh\u1eefng NC k\u1ec3 tr\u00ean \u0111\u1ec1u t\u1eadp trung v\u00e0o ch\u1ee7 \u0111\u1ec1 \u201cNghi\u00ean c\u1ee9u qu\u1ea3n l\u00fd l\u1eadp \u0111\u1ecba v\u00e0 n\u0103ng su\u1ea5t r\u1eebng\u201d\u00a0 cho c\u00e1c lo\u00e0i \u0111\u01b0\u1ee3c c\u00f4ng b\u1ed1 t\u1ea1i h\u1ed9i th\u1ea3o qu\u1ed1c t\u1ebf 7-11 th\u00e1ng 12\/ 1999 \u1edf \u1ea4n \u0111\u1ed9.<\/p>\n<p>T\u01b0\u01a1ng t\u1ef1 c\u00f3 r\u1ea5t nhi\u1ec1u NC c\u00f9ng ch\u1ee7 \u0111\u1ec1 n\u00e0y \u0111\u00e3 \u0111\u01b0\u1ee3c b\u00e1o c\u00e1o t\u1ea1i c\u00e1c H\u1ed9i th\u1ea3o qu\u1ed1c t\u1ebf t\u1ed5 ch\u1ee9c t\u1ea1i Indoneshia (1999), Brazil (2004), Trung qu\u1ed1c (2006).<\/p>\n<p>K\u1ebft q\u1ee7a c\u1ee7a c\u00e1c NC \u0111\u1ec1u ch\u1ee9ng minh vai tr\u00f2 c\u1ee7a qu\u1ea3n l\u00fd VLHCSKT, dinh d\u01b0\u1ee1ng v\u00e0 th\u1ef1c v\u1eadt nh\u1eb1m t\u0103ng n\u0103ng su\u1ea5t b\u1ec1n v\u1eefng r\u1eebng tr\u1ed3ng<\/p>\n<p><b>C\u00e1c NC \u1edf trong n\u01b0\u1edbc<\/b><\/p>\n<p>\u0110\u1ed1i v\u1edbi 3 lo\u00e0i c\u00e2y Nc c\u1ee7a \u0111\u1ec1 t\u00e0i \u0111\u1ec1u c\u00f3 c\u00e1c NC v\u1ec1 l\u0129nh v\u1ef1c: NC v\u1ec1 gi\u1ed1ng; c\u00e1c bi\u1ec7n ph\u00e1p l\u00e0m \u0111\u1ea5t; c\u00e1c bi\u1ec7n ph\u00e1p x\u1eed l\u00fd th\u1ef1c b\u00ec; k\u1ef9 thu\u1eadt b\u00f3n ph\u00e2n ; x\u00e1c \u0111\u1ecbnh m\u1eadt \u0111\u1ed9 tr\u1ed3ng r\u1eebng<\/p>\n<p>Bi\u1ec7n ph\u00e1p qu\u1ea3n l\u00fd v\u1eadt li\u1ec7u h\u1eefu c\u01a1 cung c\u1ea5p cho \u0111\u1ea5t. D\u1ef1 \u00e1n\u201cQu\u1ea3n l\u00fd l\u1eadp \u0111\u1ecba v\u00e0 n\u0103ng su\u1ea5t r\u1eebng nhi\u1ec7t \u0111\u1edbi\u201d cho c\u00e2y keo l\u00e1 tr\u00e0m \u0111\u00e3 ch\u1ee9ng t\u1ecf duy tr\u00ec VLHCSKT r\u1eebng, v\u00e0 b\u1ed5 sung s\u1ef1 thi\u1ebfu h\u1ee5t l\u00e2n trong \u0111\u1ea5t, \u0111\u00e3 l\u00e0m t\u0103ng 20% n\u0103ng su\u1ea5t v\u00e0 c\u1ea3i thi\u1ec7n \u0111\u1ed9 ph\u00ec \u0111\u1ea5t (V\u0169 \u0110\u00ecnh H\u01b0\u1edfng, Ph\u1ea1m Th\u1ebf D\u0169ng v\u00e0 cs., 2004).. Tuy nhi\u00ean, \u0111\u1ed1i t\u01b0\u1ee3ng nghi\u00ean c\u1ee9u c\u1ee7a d\u1ef1 \u00e1n m\u1edbi ch\u1ec9 l\u00e0 lo\u00e0i c\u00e2y keo l\u00e1 tr\u00e0m v\u00e0 tr\u00ean m\u1ed9t d\u1ea1ng l\u1eadp \u0111\u1ecba t\u1ea1i mi\u1ec1n \u0110\u00f4ng Nam B\u1ed9, do v\u1eady c\u1ea7n m\u1edf r\u1ed9ng nghi\u00ean c\u1ee9u n\u00e0y cho m\u1ed9t s\u1ed1 lo\u00e0i c\u00e2y tr\u1ed3ng r\u1eebng ch\u1ee7 y\u1ebfu tr\u00ean c\u00e1c v\u00f9ng sinh th\u00e1i kh\u00e1c nhau.<\/p>\n<p><b>II. M\u1ee4C TI\u00caU NGHI\u00caN C\u1ee8U<\/b><\/p>\n<p><b>\u00a0M\u1ee5c ti\u00eau chung: <\/b><\/p>\n<p>NC nh\u1eb1m n\u00e2ng cao n\u0103ng su\u1ea5t r\u1eebng tr\u1ed3ng v\u00e0 ph\u00e1t tri\u1ec3n b\u1ec1n v\u1eefng l\u00e2m nghi\u1ec7p.<\/p>\n<p><b>M\u1ee5c ti\u00eau c\u1ee5 th\u1ec3:<\/b><\/p>\n<p>X\u00e1c \u0111\u1ecbnh \u1ea3nh h\u01b0\u1edfng c\u1ee7a c\u00e1c bi\u1ec7n ph\u00e1p k\u1ef9 thu\u1eadt g\u1ed3m qu\u1ea3n l\u00fd <b>VLHCSKT, dinh d\u01b0\u1ee1ng, th\u1ef1c v\u1eadt v\u00e0 t\u1ec9a th\u01b0a <\/b>\u0111\u1ebfn <b>n\u0103ng su\u1ea5t r\u1eebng <\/b>tr\u1ed3ng (sinh tr\u01b0\u1edfng, sinh kh\u1ed1i, tr\u1eef l\u01b0\u1ee3ng r\u1eebng)\u00a0 <b>keo l\u00e1 tr\u00e0m, keo lai, b\u1ea1ch \u0111\u00e0n<\/b> v\u00e0 ch\u1ec9 s\u1ed1 v\u1ec1 <b>\u0111\u1ed9 ph\u00ec \u0111\u1ea5t<\/b>,<\/p>\n<p><b>III. N\u1ed8I DUNG NGHI\u00caN C\u1ee8U<\/b><\/p>\n<p>\u0110\u00e1nh gi\u00e1 t\u00ednh ch\u1ea5t \u0111\u1ea5t v\u00e0 n\u0103ng su\u1ea5t r\u1eebng tr\u1ed3ng Keo lai chu k\u1ef3 \u0111\u1ea7u tr\u01b0\u1edbc khi tr\u1ed3ng r\u1eebng th\u00ed nghi\u1ec7m l\u00e0m c\u01a1 s\u1edf so s\u00e1nh v\u1edbi chu k\u1ef3 sau.<\/p>\n<p>\u0110\u00e1nh gi\u00e1 t\u00ednh ch\u1ea5t \u0111\u1ea5t v\u00e0 sinh tr\u01b0\u1edfng r\u1eebng chu k\u1ef3 k\u1ebf ti\u1ebfp c\u1ee7a r\u1eebng tr\u1ed3ng th\u00ed nghi\u1ec7m d\u01b0\u1edbi \u1ea3nh h\u01b0\u1edfng c\u1ee7a qu\u1ea3n l\u00fd l\u1eadp \u0111\u1ecba: Qu\u1ea3n l\u00fd VLHCSKT r\u1eebng. Qu\u1ea3n l\u00fd dinh d\u01b0\u1ee1ng. Qu\u1ea3n l\u00ed th\u1ef1c v\u1eadt qua ki\u1ec3m so\u00e1t c\u1ecf d\u1ea1i d\u01b0\u1edbi t\u00e1n r\u1eebng. Qu\u1ea3n l\u00ed, \u0111i\u1ec1u ch\u1ebf r\u1eebng qua th\u00ed nghi\u1ec7m t\u1ec9a th\u01b0a nh\u1eb1m n\u00e2ng cao ch\u1ea5t l\u1ef1\u01a1ng g\u1ed7 r\u1eebng tr\u1ed3ng (chi ti\u1ebft xem b\u00e1o c\u00e1o ch\u00ednh).<\/p>\n<p><b>\u0110\u1ecba \u0111i\u1ec3m nghi\u00ean c\u1ee9u<br \/>\n(xem chi ti\u1ebft trong b\u00e1o c\u00e1o ch\u00ednh<\/b><b>)<\/b><\/p>\n<p><b><span style=\"text-decoration: underline;\">T\u1ea1i mi\u1ec1n Nam 10 ha<\/span><\/b><\/p>\n<p>Tr\u1ea1m TNLN T\u00e2n Ph\u00fa \u2013x\u00e3 T\u00e2n H\u00f2a, huy\u1ec7n \u0110\u1ed3ng ph\u00fa, t\u1ec9nh B\u00ecnh Ph\u01b0\u1edbc<\/p>\n<p><b><span style=\"text-decoration: underline;\">T\u1ea1i mi\u1ec1n Trung 10 ha<\/span><\/b><\/p>\n<p><b>+ <\/b>T\u1ea1i l\u00f4 a9, kho\u1ea3nh 7A, ti\u1ec3u khu 777,\u00a0 huy\u1ec7n Cam L\u1ed9, t\u1ec9nh Qu\u1ea3ng Tr\u1ecb\u2013 Trung t\u00e2m KHSXLN v\u00f9ng B\u1eafc Trung B\u1ed9.<\/p>\n<p>+ N\u01a1i b\u1ed1 tr\u00ed th\u00ed nghi\u1ec7m Qu\u1ea3n l\u00fd th\u1ef1c v\u1eadt l\u00f4 f , Qu\u1ea3n l\u00fd dinh d\u01b0\u1ee1ng t\u1ea1i l\u00f4 g\u00a0 ti\u1ec3u khu 301 v\u00e0 t\u1ec9a th\u01b0a t\u1ea1i l\u00f4 a ti\u1ec3u khu 300 x\u00e3 T\u00e2y Xu\u00e2n, huy\u1ec7n T\u00e2y S\u01a1n, t\u1ec9nh B\u00ecnh \u0110\u1ecbnh.<\/p>\n<p><b><span style=\"text-decoration: underline;\">T\u1ea1i mi\u1ec1n B\u1eafc 10 ha<\/span><\/b><\/p>\n<p>+Th\u00ed nghi\u1ec7m <b>Qu\u1ea3n l\u00ed VLHCSKT r\u1eebng:<\/b> Trung t\u00e2m KHSX L\u00e2m nghi\u1ec7p \u0110\u00f4ng B\u1eafc B\u1ed9.<\/p>\n<p>+ T<b>h\u00ed nghi\u1ec7m v\u1ec1 <\/b>Qu\u1ea3n l\u00fd dinh d\u01b0\u1ee1ng, th\u1ef1c v\u1eadt v\u00e0 \u0111i\u1ec1u ch\u1ebf t\u1ec9a th\u01b0a: T\u1ea1i c\u00f4ng ty L\u00e2m ghi\u1ec7p Tam Thanh, huy\u1ec7n Tam N\u00f4ng, t\u1ec9nh V\u0129nh Ph\u00fa.<\/p>\n<p><b>\u0110\u1ed1i t\u01b0\u1ee3ng nghi\u00ean c\u1ee9u:<\/b><\/p>\n<p>+T\u1ea1i mi\u1ec1n Nam:\u00a0 C\u00e2y Keo l\u00e1 tr\u00e0m, d\u00f2ng AA1, AA9<\/p>\n<p>+T\u1ea1i mi\u1ec1n Trung: C\u00e2y keo lai h\u1ed7n h\u1ee3p c\u00e1c d\u00f2ng BV10, BV 16 v\u00e0 BV 32.<\/p>\n<p>+T\u1ea1i mi\u1ec1n B\u1eafc: C\u00e2y B\u1ea1ch \u0111\u00e0n Urophylla (U6).<\/p>\n<p><b>IV. <\/b><b>PH\u01af\u01a0NG PH\u00c1P NGHI\u00caN C\u1ee8U<\/b><\/p>\n<p><b>a) Ph\u01b0\u01a1ng ph\u00e1p b\u1ed1 tr\u00ed th\u00ed nghi\u1ec7m<\/b><\/p>\n<p>T\u1ea5t c\u1ea3 c\u00e1c th\u00ed nghi\u1ec7m \u0111\u01b0\u1ee3c b\u1ed1 tr\u00ed theo kh\u1ed1i ng\u1eabu nhi\u00ean \u0111\u1ea7y \u0111\u1ee7 c\u00f3 t\u1eeb 4-5 l\u1ea7n l\u1eb7p t\u00f9y th\u00ed nghi\u1ec7m.Xung quanh th\u00ed nghi\u1ec7m ch\u00ednh, c\u00f3 b\u1ed1 tr\u00ed di\u1ec7n t\u00edch v\u00f9ng \u0111\u1ec7m \u0111\u1ec3 l\u1ea5u m\u1eabu NC v\u1ec1 sinh kh\u1ed1i.<\/p>\n<p>(Xem s\u01a1 \u0111\u1ed3 TN trong b\u00e1o c\u00e1o ch\u00ednh)<\/p>\n<p><b>b)Ph\u01b0\u01a1ng ph\u00e1p thu th\u1eadp v\u00e0 x\u1eed l\u00fd s\u1ed1 li\u1ec7u<\/b><\/p>\n<p>&#8211;\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <b>Thu th\u1eadp s\u1ed1 li\u1ec7u:<\/b><\/p>\n<p><b>+ \u0110o sinh tr\u01b0\u1edfng r\u1eebng:<\/b><\/p>\n<p>D<sub>1.3<\/sub>, Hvn c\u1ee7a l\u00f4 r\u1eebng lu\u00e2n k\u1ef3 tr\u01b0\u1edbc khi khai th\u00e1c \u0111\u1ec3 tr\u1ed3ng r\u1eebng th\u00ed nghi\u1ec7m. \u00a0Tr\u1eef l\u01b0\u1ee3ng M b\u1eb1ng gi\u1ea3i t\u00edch 30 c\u00e2y \u0111\u1ea1i di\u1ec7n cho c\u00e1c c\u1ea5p k\u00ednh. Thi\u1ebft l\u1eadp ph\u01b0\u01a1ng tr\u00ecnh t\u01b0\u01a1ng quan gi\u1eefa th\u1ec3 t\u00edch c\u00e2y c\u00e1 th\u1ec3 v\u1edbi c\u00e1c ch\u1ec9 ti\u00eau bi\u1ec3u th\u1ecb k\u00edch th\u01b0\u1edbc c\u00e2y nh\u01b0 \u0111\u01b0\u1eddng k\u00ednh v\u00e0 chi\u1ec1u cao l\u00e0m c\u01a1 s\u1edf \u01b0\u1edbc t\u00ednh tr\u1eef l\u01b0\u1ee3ng l\u00e2m ph\u1ea7n.\u00a0 D<sub>1.3<\/sub>, Hvn , M c\u1ee7a r\u1eebng chu k\u1ef3 2 \u0111\u01b0\u1ee3c \u0111o \u0111\u1ecbnh k\u1ef3 h\u00e0ng n\u0103m.<\/p>\n<p><b>+ X\u00e1c \u0111\u1ecbnh sinh kh\u1ed1i cho\u00a0 r\u1eebng tr\u01b0\u1edbc khi khai th\u00e1c v\u00e0 r\u1eebng NC TN.<\/b><\/p>\n<p>Ph\u01b0\u01a1ng ph\u00e1p c\u00e2y ti\u00eau chu\u1ea9n: 30 c\u00e2y ti\u00eau chu\u1ea9n \u0111\u1ec3 gi\u1ea3i t\u00edch v\u00e0 6 c\u00e2y trong s\u1ed1 n\u00e0y \u0111\u1ec3 ph\u00e2n t\u00edch h\u00f3a h\u1ecdc: N-Ph\u01b0\u01a1ng ph\u00e1p Kjeldahl;\u00a0 P- Ph\u01b0\u01a1ng ph\u00e1p quang k\u1ebf ph\u1ed5; K-Ph\u01b0\u01a1ng ph\u00e1p quang k\u1ebf ng\u1ecdn l\u1eeda; Ca v\u00e0 Mg- Ph\u01b0\u01a1ng ph\u00e1p h\u1ea5p th\u1ee5 nguy\u00ean t\u1eed.<\/p>\n<p><b>+ Thu m\u1eabu \u0111\u1ea5t v\u00e0 ph\u00e2n t\u00edch:<\/b><\/p>\n<p>Tr\u01b0\u1edbc TN, m\u1eabu \u0111\u1ea5t \u0111\u01b0\u1ee3c thu th\u1eadp \u1edf t\u1ea5t c\u1ea3 c\u00e1c \u0111i\u1ec3m nghi\u00ean c\u1ee9u. M\u1eabu \u0111\u01b0\u1ee3c l\u1ea5y t\u1eeb 5 \u0111i\u1ec3m tr\u00ean m\u1ed7i \u00f4 th\u00ed nghi\u1ec7m v\u1edbi 4 \u0111\u1ed9 s\u00e2u t\u1ea7ng \u0111\u1ea5t: 0 &#8211; 10cm; 10 &#8211; 20 cm; 20 &#8211; 30 cm v\u00e0 30 &#8211; 50 cm. Nh\u1eefng m\u1eabu c\u1ee7a c\u00f9ng \u0111\u1ed9 s\u00e2u \u0111\u01b0\u1ee3c tr\u1ed9n l\u1ea1i th\u00e0nh m\u1ed9t m\u1eabu h\u1ed7n h\u1ee3p, nh\u01b0 v\u1eady s\u1ebd c\u00f3 4 m\u1eabu cho 4 \u0111\u1ed9 s\u00e2u t\u1ea7ng \u0111\u1ea5t. T\u1eeb m\u1ed7i m\u1eabu h\u1ed7n h\u1ee3p, l\u1ea5y hai m\u1eabu ph\u1ee5 ng\u1eabu nhi\u00ean v\u00e0 ph\u01a1i kh\u00f4 kh\u00f4ng kh\u00ed. M\u1ed9t n\u1eeda c\u1ee7a m\u1eabu ph\u1ee5 s\u1ebd \u0111\u01b0\u1ee3c d\u00f9ng cho ph\u00e2n t\u00edch v\u00e0 n\u1eeda c\u00f2n l\u1ea1i \u0111\u01b0\u1ee3c l\u01b0u gi\u1eef. M\u1eabu \u0111\u1ea5t sau khi nghi\u1ec1n c\u00f3 k\u00edch c\u1ee1 h\u1ea1t \u0111\u1ea5t nh\u1ecf h\u01a1n 2mm \u0111\u01b0\u1ee3c d\u00f9ng \u0111\u1ec3 ph\u00e2n t\u00edch h\u00f3a h\u1ecdc.<\/p>\n<p>Ph\u01b0\u01a1ng ph\u00e1p ph\u00e2n t\u00edch:<\/p>\n<p>Ch\u1ea5t h\u1eefu c\u01a1: Ph\u01b0\u01a1ng ph\u00e1p Walkley-Black.<\/p>\n<p>N t\u1ed5ng s\u1ed1: C\u00f4ng ph\u00e1 m\u1eabu b\u1edfi h\u1ed7n h\u1ee3p sulphuric acid \u2013selenium v\u00e0 hydrogen perroxide 30% v\u00e0 ph\u01b0\u01a1ng ph\u00e1p Kieldahl.<\/p>\n<p>P t\u1ed5ng s\u1ed1: C\u00f4ng ph\u00e1 m\u1eabu b\u1eb1ng h\u1ed7n h\u1ee3p sulphuric acid v\u00e0 peroxide 30%, ph\u01b0\u01a1ng ph\u00e1p so m\u1ea7u.<\/p>\n<p>K t\u1ed5ng s\u1ed1: C\u00f4ng ph\u00e1 m\u1eabu t\u01b0\u01a1ng t\u1ef1 nh\u01b0 v\u1edbi P t\u1ed5ng s\u1ed1, ph\u01b0\u01a1ng ph\u00e1p quang k\u1ebf ng\u1ecdn l\u1eeda.<\/p>\n<p>N d\u1ec5 ti\u00eau:\u00a0 Tr\u00edch m\u1eabu b\u1eb1ng acid sulphiric 0.5N, b\u1ed9t k\u1ebdm (Zn) v\u00e0 K<sub>2<\/sub>Cr<sub>2<\/sub>O<sub>7 <\/sub>10%.<\/p>\n<p>P d\u1ec5 ti\u00eau: Ph\u01b0\u01a1ng ph\u00e1p so m\u1ea7u, tr\u00edch b\u1eb1ng dung d\u1ecbch Bray-I (0.03M NH<sub>4<\/sub>F v\u00e0 0.025M HCl).<\/p>\n<p>K trao \u0111\u1ed5i: Tr\u00edch b\u1eb1ng dung d\u1ecbch NH4Cl (1M) v\u00e0 \u0111o b\u1eb1ng ph\u01b0\u01a1ng ph\u00e1p quang k\u1ebf ng\u1ecdn l\u1eeda.<\/p>\n<p>Ca, Mg trao \u0111\u1ed5i:\u00a0 Tr\u00edch b\u1eb1ng dung d\u1ecbch NH4Cl (1M) v\u00e0 ph\u01b0\u01a1ng ph\u00e1p h\u1ea5p ph\u1ee5 nguy\u00ean t\u1eed (AAS).<\/p>\n<p>pH: trong dung d\u1ecbch 1 : 2.5.<\/p>\n<p>Dung tr\u1ecdng x\u00e1c \u0111\u1ecbnh t\u1ea1i m\u1ed7i \u00f4 th\u00ed nghi\u1ec7m \u1edf c\u00e1c t\u1ea7ng \u0111\u1ea5t : 0-10, 10-20, 20-30 v\u00e0 30-50 cm. Sau \u0111\u00f3 c\u00e1c m\u1eabu \u0111\u01b0\u1ee3c s\u1ea5y kh\u00f4 \u1edf 105 <sup>0<\/sup>C \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh tr\u1ecdng l\u01b0\u1ee3ng kh\u00f4.<\/p>\n<p>CEC \u2013 tr\u00edch b\u1eb1ng dung d\u1ecbch NH<sub>4<\/sub>Cl 1M. Ph\u00e2n t\u00edch CEC nh\u01b0 Ca v\u00e0 Mg trao \u0111\u1ed5i \u1edf tr\u00ean.<\/p>\n<p><b>c)Ph\u01b0\u01a1ng ph\u00e1p x\u1eed l\u00fd s\u1ed1 li\u1ec7u:<\/b><\/p>\n<p>S\u1ed1 li\u1ec7u thu th\u1eadp \u0111\u01b0\u1ee3c x\u1eed l\u00fd theo ph\u01b0\u01a1ng ph\u00e1p th\u1ed1ng k\u00ea sinh h\u1ecdc v\u1edbi ph\u1ea7n m\u1ec1m Statgraphic Plus 3.0, Genstat 4.24 DE v\u00e0 Excel 7.0 \u0111\u1ec3 t\u00ednh to\u00e1n. Ph\u01b0\u01a1ng ph\u00e1p t\u00ednh v\u00e0 ph\u00e2n t\u00edch h\u1ed3i qui t\u01b0\u01a1ng quan theo Nguy\u1ec5n Ng\u1ecdc Ki\u1ec3ng (1996).<\/p>\n<p><b>V. <\/b><b>K\u1ebeT Q\u1ee6A NGHI\u00caN C\u1ee8U <\/b><b>V\u00c0 TH\u1ea2O LU\u1eacN<\/b><\/p>\n<p><b>T\u1ea1i ph\u00eda Nam- C\u00e2y keo l\u00e1 tr\u00e0m<\/b><\/p>\n<p>&#8211; T\u00ednh ch\u1ea5t \u0111\u1ea5t r\u1eebng tr\u01b0\u1edbc khi th\u00ed nghi\u1ec7m<\/p>\n<p><i>\u0110\u1ed9 chua pH, dung tr\u1ecdng c\u1ee7a \u0111\u1ea5t:<\/i><\/p>\n<p>pH (H<sub>2<\/sub>0) v\u00e0 pH (KCL) kh\u00f4ng bi\u1ebfn \u0111\u1ed5i gi\u1eefa c\u00e1c c\u00f4ng th\u1ee9c th\u00ed nghi\u1ec7m; Nh\u01b0ng c\u00f3 bi\u1ebfn \u0111\u1ed9ng nh\u1ecf theo th\u1eddi gian c\u1ee7a t\u1eebng c\u00f4ng th\u1ee9c theo h\u01b0\u1edbng gi\u1ea3m \u0111\u1ed9 chua h\u01a1n (ch\u1ec9 s\u1ed1 pH t\u0103ng) \u1edf c\u1ea3 hai t\u1ea7ng \u0111\u1ea5t.<\/p>\n<p>\u0110\u1ec3 l\u1ea1i VLHCSKT \u0111\u00e3 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn dung tr\u1ecdng \u0111\u1ea5t, t\u1eeb 1,32 gram\/cm<sup>3<\/sup> \u1edf BLo \u0111\u1ebfn 1,24 gram\/cm3 \u1edf BL<sub>2<\/sub> t\u1ea1i t\u1ea7ng 0-10 cm. Dung tr\u1ecdng t\u0103ng d\u1ea7n theo \u0111\u1ed9 s\u00e2u t\u1ea7ng \u0111\u1ea5t \u1edf t\u1ea5t c\u1ea3 c\u00e1c c\u00f4ng th\u1ee9c TN.<\/p>\n<p><i>H\u00e0m l\u01b0\u1ee3ng dinh d\u01b0\u1ee1ng C, N v\u00e0 P c\u1ee7a \u0111\u1ea5t<\/i><\/p>\n<p>C v\u00e0 N t\u0103ng theo tu\u1ed5i r\u1eebng, gi\u1eef c\u00e0ng nhi\u1ec1u VLHCSKT (BL<sub>2<\/sub>) th\u00ec C,N c\u00e0ng cao h\u01a1n so v\u1edbi gi\u1eef \u00edt (BL<sub>1<\/sub>) ho\u1eb7c kh\u00f4ng gi\u1eef l\u1ea1i (BLo). P \u0111\u1ec1u gi\u1ea3m \u1edf c\u1ea3 3 c\u00f4ng th\u1ee9c th\u00ed nghi\u1ec7m. \u0110i\u1ec1u n\u00e0y ph\u00f9 h\u1ee3p v\u1edbi s\u1ef1 t\u00edch l\u0169y l\u00e2n trong c\u00e2y t\u0103ng theo tu\u1ed5i v\u00e0 cho th\u1ea5y nhu c\u1ea7u s\u1eed d\u1ee5ng P c\u1ee7a c\u00e2y l\u00e0 r\u1ea5t l\u1edbn, c\u1ea7n b\u1ed5 sung ngu\u1ed3n ph\u00e2n l\u00e2n cho r\u1eebng.<\/p>\n<p><i>Di\u1ec5n bi\u1ebfn trao \u0111\u1ed5i cation c\u1ee7a \u0111\u1ea5t:<\/i><\/p>\n<p>Ba lo\u1ea1i Cation trao \u0111\u1ed5i (K, Ca v\u00e0 Mg) gi\u1eefa c\u00e1c c\u00f4ng th\u1ee9c th\u00ed nghi\u1ec7m theo h\u01b0\u1edbng Bl<sub>2<\/sub> t\u1ed1t h\u01a1n BL<sub>1<\/sub> v\u00e0 BLo, nh\u01b0ng s\u1ef1 kh\u00e1c bi\u1ec7t n\u00e0y kh\u00f4ng \u0111\u1ee7 l\u1edbn.<i> <\/i><\/p>\n<p><i>Lu\u00e2n chuy\u1ec3n dinh d\u01b0\u1ee1ng trong \u0111\u1ea5t:<\/i><\/p>\n<p>Ph\u00e2n t\u00edch ngu\u1ed3n dinh d\u01b0\u1ee1ng ch\u1ee7 y\u1ebfu gi\u1eefa cung c\u1ea5p v\u00e0 s\u1eed d\u1ee5ng sau 5 n\u0103m th\u00ed nghi\u1ec7m \u1edf lu\u00e2n k\u1ef3 2 \u0111\u01b0\u1ee3c t\u1ed5ng h\u1ee3p cho th\u1ea5y: Sau 5 n\u0103m, \u0111\u1ec3 l\u1ea1i VLHCSKT \u0111\u00e3 c\u1ea3i thi\u1ec7n \u0111\u00e1ng k\u1ec3 \u0111\u1ed9 ph\u00ec trong \u0111\u1ea5t.<\/p>\n<p>&#8211;\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u0110\u1ed1i v\u1edbi N:\u00a0 kh\u00f4ng nh\u1eefng duy tr\u00ec m\u00e0 \u0111\u00e3 b\u1ed5 sung th\u00eam.<\/p>\n<p>&#8211;\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u0110\u1ed1i v\u1edbi\u00a0 P, \u0111\u00e3 ch\u1ec9 ra s\u1ef1 thi\u1ebfu h\u1ee5t L\u00e2n cho nh\u1eefng chu k\u1ef3 tr\u1ed3ng r\u1eebng k\u1ebf ti\u1ebfp b\u1edfi h\u00e0m l\u01b0\u1ee3ng l\u00e2n s\u1eed d\u1ee5ng \u0111\u1ec3 t\u1ea1o r\u1eebng r\u1ea5t l\u1edbn so v\u1edbi ngu\u1ed3n cung c\u1ea5p. \u0110\u00e2y ch\u00ednh l\u00e0 c\u01a1 s\u1edf khoa h\u1ecdc cho TN qu\u1ea3n l\u00fd dinh d\u01b0\u1ee1ng th\u00f4ng qua b\u1ed5 sung h\u00e0m l\u01b0\u1ee3ng b\u1eb1ng b\u00f3n th\u00eam L\u00e2n cho r\u1eebng tr\u1ed3ng.<\/p>\n<p>&#8211;\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u0110\u1ed1i v\u1edbi Kali (K), th\u00ed nghi\u1ec7m c\u0169ng ch\u1ec9 ra s\u1ef1 c\u1ea7n thi\u1ebft ph\u1ea3i b\u1ed5 sung Kali cho r\u1eebng tr\u1ed3ng b\u1edfi s\u1ef1 thi\u1ebfu h\u1ee5t dinh d\u01b0\u1ee1ng n\u00e0y.<\/p>\n<p>&#8211;\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u0110\u1ed1i v\u1edbi Canxi (Ca) v\u00e0 Ma-nh\u00ea (Mg), th\u00ed nghi\u1ec7m ch\u1ec9 ra r\u1eb1ng b\u1eb1ng gi\u1eef l\u1ea1i VLHCSKT c\u00f3 th\u1ec3 c\u00e2n b\u1eb1ng \u0111\u01b0\u1ee3c dinh d\u01b0\u1ee1ng n\u00e0y m\u00e0 kh\u00f4ng c\u1ea7n b\u1ed5 sung th\u00eam trong th\u1eed nghi\u1ec7m b\u00f3n ph\u00e2n.<\/p>\n<p>\u0110\u1eb7c \u0111i\u1ec3m r\u1eebng tr\u01b0\u1edbc khi th\u00ed nghi\u1ec7m:<br \/>\nM \u1edf Bl<sub>3<\/sub> lu\u00f4n cao nh\u1ea5t, &gt; Bl<sub>0 <\/sub>t\u1eeb 10 \u0111\u1ebfn 28% (\u1edf tu\u1ed5i &lt;3). \u1ede tu\u1ed5i 6, Bl<sub>3\u00a0 <\/sub>c\u00f3 M l\u1edbn nh\u1ea5t (180.4 m<sup>3<\/sup>\/ha), Bl<sub>2 <\/sub>(165.2 m<sup>3<\/sup>\/ha) v\u00e0 Bl<sub>0<\/sub> (151.9 m<sup>3<\/sup>\/ha)\u00e0 N\u0103ng su\u1ea5t r\u1eebng \u0111\u00e3 t\u0103ng c\u00f9ng v\u1edbi c\u00e1c ch\u1ec9 s\u1ed1 v\u1ec1 \u0111\u1ed9 ph\u00ec \u0111\u1ea5t n\u00f3i tr\u00ean.<\/p>\n<p>\u0110\u1ec3 l\u1ea1i VLHCSKT \u0111\u00e3 l\u00e0m t\u0103ng 8,7 % sinh kh\u1ed1i r\u1eebng, n\u1ebfu \u0111\u1ec3 g\u1ea5p \u0111\u00f4i l\u01b0\u1ee3ng VLHCSKT (Bl2) th\u00ec s\u1ebd t\u0103ng 18,47 %.<\/p>\n<p><i>L\u01b0\u1ee3ng VLHC \u0111\u1ec3 l\u1ea1i sau khai th\u00e1c v\u00e0 kh\u1ea3 n\u0103ng b\u1ed3i ho\u00e0n dinh d\u01b0\u1ee1ng cho \u0111\u1ea5t.<\/i><\/p>\n<p>L\u01b0\u1ee3ng VLHCSKT c\u00e0ng l\u1edbn th\u00ec h\u00e0m l\u01b0\u1ee3ng c\u00e1c ch\u1ea5t dinh d\u01b0\u1ee1ng cung c\u1ea5p cho \u0111\u1ea5t cao.<sub>.<\/sub> N\u1ebfu mang \u0111i kh\u1ecfi r\u1eebng to\u00e0n b\u1ed9 VLHCSKT (c\u00e0nh nh\u00e1nh &lt; 5cm v\u00e0 c\u00e2y b\u1ee5i tr\u00ean s\u00e0n r\u1eebng) th\u00ec s\u1ebd m\u1ea5t kho\u1ea3ng 15,3 t\u1ea5n sinh kh\u1ed1i \/ha t\u01b0\u01a1ng \u1ee9ng 141,6 kg N; 3,5 kg L\u00e2n; 47,2 kg Kali; 54,1 kg Ca<sup>++ <\/sup>; V\u00e0 8,7 kg Mg<sup>++<\/sup>.<\/p>\n<p><b>&#8211; V\u1ec1 Sinh tr\u01b0\u1edfng r\u1eebng<\/b>:<\/p>\n<p>R\u1eebng tr\u1ed3ng 24 th\u00e1ng tu\u1ed5i c\u00f3 s\u1ef1 kh\u00e1c bi\u1ec7t v\u1ec1 m\u1eb7t th\u1ed1ng k\u00ea gi\u1eefa c\u00e1c nghi\u1ec7m th\u1ee9c \u0111\u1ed1i v\u1edbi c\u00e1c ch\u1ec9 ti\u00eau sinh tr\u01b0\u1edfng \u0111\u01b0\u1eddng k\u00ednh, chi\u1ec1u cao v\u00e0 tr\u1eef l\u01b0\u1ee3ng.<\/p>\n<p>&#8211; V\u1ec1 sinh kh\u1ed1i, b\u1ea3ng sau cho th\u1ea5y c\u00f4ng th\u1ee9c F(H) t\u0103ng so F(L) 11,22 t\u1ea5n\/ha (54,2%), v\u00e0 F(M) so v\u1edbi F(L) t\u0103ng 10,0 t\u1ea5n\/ha (48,3%).<\/p>\n<p>&#8211; V\u1ec1 th\u00e0nh ph\u1ea7n dinh d\u01b0\u1ee1ng N,P,K,Ca v\u00e0 Mg c\u0169ng t\u0103ng l\u1ea7n l\u01b0\u1ee3t theo th\u1ee9 t\u1ef1 nh\u01b0 sau:<\/p>\n<p>F(H) so v\u1edbi F(L) t\u0103ng:\u00a0\u00a0 14,88 % ; 17,46 % ;\u00a0 16,29 %;\u00a0\u00a0 17,3 %\u00a0\u00a0 v\u00e0\u00a0 7,8 %.<\/p>\n<p>F(M) so v\u1edbi F(L) t\u0103ng:\u00a0 11,20 %\u00a0 ; 14,04 %\u00a0\u00a0 ; 12,13 %;\u00a0 21,11 %\u00a0 v\u00e0\u00a0 04,60 %.<\/p>\n<p><b>\u1ea2nh h\u01b0\u1edfng c\u1ee7a qu\u1ea3n l\u00fd VLHCSKT \u0111\u1ebfn bi\u1ebfn \u0111\u1ed5i t\u00ednh ch\u1ea5t \u0111\u1ea5t sau 2 n\u0103m th\u00ed nghi\u1ec7m (2008-2010).<\/b><b> <\/b><\/p>\n<p><i>&#8211; So s\u00e1nh gi\u1eefa c\u00e1c nghi\u1ec7m th\u1ee9c:<\/i><\/p>\n<p>C\u00f4ng th\u1ee9c F(M), \u0111\u1ea5t c\u00f3 xu th\u1ebf gi\u1ea3m \u0111\u1ed9 chua so v\u1edbi c\u00e1c c\u00f4ng th\u1ee9c kh\u00e1c.<\/p>\n<p>N, P, K v\u00e0 C t\u1ed5ng s\u1ed1 \u0111\u01b0\u1ee3c c\u1ea3i thi\u1ec7n theo h\u01b0\u1edbng t\u0103ng t\u1eeb nghi\u1ec7m th\u1ee9c F(H), k\u1ebf \u0111\u1ebfn F(M) , th\u1ea5p nh\u1ea5t\u00a0 l\u00e0 \u0111\u1ed1i ch\u1ee9ng F(L).<\/p>\n<p>N dt v\u00e0 P dt \u0111\u1ec1u gi\u1ea3m theo \u0111\u1ed9 s\u00e2u t\u1ea7ng \u0111\u1ea5t v\u00e0 t\u0103ng r\u00f5 r\u1ec7t t\u1eeb nghi\u1ec7m th\u1ee9c \u0111\u1ebfn FL v\u00e0 FH. Theo \u0111\u00f3, \u0111\u1ea1m d\u1ec3 ti\u00eau\u00a0 t\u0103ng t\u1eeb 37,1 (t\u1ea7ng 0-10 cm) \u0111\u1ebfn 64,1 % (t\u1ea7ng 30-50 cm). C\u00f2n L\u00e2n d\u1ec5 ti\u00eau t\u0103ng t\u1eeb 23,1 (t\u1ea7ng 0-10 cm) \u0111\u1ebfn 68,1 (t\u1ea7ng 30-50 cm) (xem s\u01a1 \u0111\u1ed3).<\/p>\n<p>S\u1ef1 t\u0103ng \u0111\u1ea1m v\u00e0 l\u00e2n d\u1ec5 ti\u00eau gi\u1eefa c\u00e1c nghi\u1ec7m th\u1ee9c th\u00ed nghi\u1ec7m qu\u1ea3n l\u00ed VLHCSKT<b> <\/b><\/p>\n<p>&#8211; TN b\u1ed5 sung v\u1ec1 x\u1eed l\u00ed VLHCSKT<\/p>\n<p>Khi so hai ph\u01b0\u01a1ng ph\u00e1p x\u1eed l\u00ed VLHCSKT\u00a0 b\u1eb1ng c\u00e1ch \u0111\u1ed1t, sau \u0111\u00f3 c\u00e0y (\u0110ck) ho\u1eb7c kh\u00f4ng c\u00e0y (\u0110kc) \u0111\u1ec1u c\u00f3 sinh tr\u01b0\u1edfng c\u1ee7a D v\u00e0 H sau khai n\u0103m g\u1ea7n b\u1eb1ng v\u1edbi F(L) v\u00e0 F(M) trong th\u00ed nghi\u1ec7m\u00a0 gi\u1eefa l\u1ea1i VLHCSKT nh\u01b0ng k\u00e9m h\u01a1n F (H) r\u1ea5t nhi\u1ec1u (xem b\u1ea3ng 15 so b\u1ea3ng )<\/p>\n<p><b>Th\u00ed nghi\u1ec7m qu\u1ea3n l\u00fd th\u1ef1c v\u1eadt d\u01b0\u1edbi t\u00e1n<\/b><\/p>\n<p>Cho th\u1ea5y t\u1ef7 l\u1ec7 s\u1ed1ng v\u00e0 c\u00e1c gi\u00e1 tr\u1ecb v\u1ec1 chi\u1ec1u cao, \u0111\u01b0\u1eddng k\u00ednh c\u1ee7a c\u00e1c nghi\u1ec7m th\u1ee9c ch\u01b0a c\u00f3 s\u1ef1 kh\u00e1c bi\u1ec7t v\u1ec1 m\u1eb7t th\u1ed1ng k\u00ea sau m\u1ed9t n\u0103m tu\u1ed5i.<\/p>\n<p><b>Th\u00ed nghi\u1ec7m qu\u1ea3n l\u00fd dinh d\u01b0\u1ee1ng<\/b><\/p>\n<p>V\u1ec1 H, \u1edf nghi\u1ec7m th\u1ee9c F4 cao nh\u1ea5t 3.3 m (t\u0103ng\u00a0 40%) so \u0111\u1ed1i ch\u1ee9ng; T\u01b0\u01a1ng t\u1ef1, F3 v\u00e0 F2 c\u00f9ng t\u0103ng 20% so \u0111\u1ed1i ch\u1ee9ng.<\/p>\n<p>V\u1ec1 D cho th\u1ea5y F4 t\u0103ng 52,9 % c\u00f2n F3 v\u00e0 F2 t\u0103ng 35,2 % so \u0111\u1ed1i ch\u1ee9ng.<\/p>\n<p>\u00e0 Cho th\u1ea5y s\u1ef1 thi\u1ebfu l\u00e2n \u0111\u01b0\u1ee3c \u0111\u00e1nh gi\u00e1 \u1edf \u0111\u1ea5t tr\u01b0\u1edbc khi tr\u1ed3ng l\u00e0 \u0111\u00fang v\u00e0 vi\u1ec7c b\u1ed5 sung P qua TN n\u00e0y r\u1ea5t c\u00f3 hi\u1ec7u qu\u1ea3.<\/p>\n<p>Th\u00ed nghi\u1ec7m b\u00f3n l\u00e2n trong qu\u1ea3n l\u00ed dinh d\u01b0\u1ee1ng<\/p>\n<p><b>Th\u00ed nghi\u1ec7m b\u1ed5 sung v\u1ec1 qu\u1ea3n l\u00fd dinh d\u01b0\u1ee1ng:<\/b><\/p>\n<p><b>Xem x\u00e9t vai tr\u00f2 c\u1ee7a NPK v\u00e0 Ph\u00e2n vi sinh <\/b>cho th\u1ea5y: D v\u00e0 H c\u1ee7a c\u00e1c nghi\u1ec7m th\u1ee9c \u0111\u1ec1u kh\u00f4ng c\u00f3 s\u1ef1 kh\u00e1c bi\u1ec7t. Ch\u00fang t\u1ecf vai tr\u00f2 c\u1ee7a NPK v\u00e0 Vi sinh l\u00e0 ch\u01b0a r\u00f5 trong giai \u0111o\u1ea1n \u0111\u1ea7u ho\u1eb7c l\u00e0 m\u1ee9c \u0111\u1ed9 ch\u01b0a t\u1ea1o n\u00ean s\u1ef1 kh\u00e1c bi\u1ec7t \u0111\u1ebfn sinh tr\u01b0\u1edfng c\u1ee7a c\u00e2y (?) v\u00e0 vai tr\u00f2 quan tr\u1ecdng c\u1ee7a b\u00f3n L\u00e2n trong th\u00ed nghi\u1ec7m s\u1eed d\u1ee5ng l\u00e2n \u1edf tr\u00ean l\u00e0 ph\u00f9 h\u1ee3p<\/p>\n<p>Xem x\u00e9t vai tr\u00f2 c\u1ee7a NPK v\u00e0 ph\u00e2n vi sinh<\/p>\n<p>Th\u00ed nghi\u1ec7m t\u1ec9a th\u01b0a r\u1eebng:<\/p>\n<p>Sau t\u1ec9a th\u01b0a 1 n\u0103m, \u0111\u00e3 c\u00f3 s\u1ef1 kh\u00e1c nhau v\u1ec1 sinh tr\u01b0\u1edfng D v\u00e0 H gi\u1eefa c\u00e1c nghi\u1ec7m th\u1ee9c.<\/p>\n<p>V\u1ec1 H c\u1ee7a c\u00e1c nghi\u1ec7m th\u1ee9c t\u1ec9a th\u01b0a so v\u1edbi \u0111\u1ed1i ch\u1ee9ng (T1) l\u00e0: 2,63 %; 3,50 %\u00a0 v\u00e0 0,8 %.<\/p>\n<p>V\u1ec1 D t\u0103ng l\u00e0: 12,12 %; 6,06 % v\u00e0 2,02 %. M\u1eb7c d\u00f9 c\u00f4ng th\u1ee9c t\u1ec9a 67 %\u00a0 c\u00f3 D va H l\u1edbn nh\u1ea5t, nh\u01b0ng M nh\u1ecf nh\u1ea5t 25.6 m<sup>3 <\/sup>ha<sup>-1<\/sup>, do gi\u1ea3m m\u1eadt \u0111\u1ed9 c\u00e2y.<\/p>\n<p><b>T\u1ea1i mi\u1ec1n Trung- C\u00e2y keo lai <\/b><\/p>\n<p><b>Th\u00ed nghi\u1ec7m qu\u1ea3n l\u00fd VLHCSKT<\/b><\/p>\n<p>\u0110\u1ec3 l\u1ea1i VLHCSKT v\u00e0 b\u00f3n l\u00f3t P \u0111\u00e3 c\u00f3 t\u00e1c \u0111\u1ed9ng t\u1ed1t t\u1edbi\u00a0 Keo lai 1 n\u0103m tu\u1ed5i.\u00a0 Gi\u1eefa c\u00e1c nghi\u1ec7m th\u1ee9c kh\u00f4ng kh\u00e1c bi\u1ec7t nhi\u1ec1u v\u1ec1 t\u1ef7 l\u1ec7 s\u1ed1ng , nh\u01b0ng kh\u00e1c bi\u1ec7t v\u1ec1 m\u1eb7t th\u1ed1ng k\u00ea \u0111\u1ed1i v\u1edb sinh tr\u01b0\u1edfng: H t\u0103ng 22,2 % v\u00e0 D t\u0103ng 27,7% gi\u1eefa nghi\u1ec7m th\u1ee9c F (H) v\u1edbi nghi\u1ec7m th\u1ee9c \u0111\u1ed1i ch\u1ee9ng F(L).<\/p>\n<p><b>Th\u00ed nghi\u1ec7m v\u1ec1 qu\u1ea3n l\u00fd th\u1ef1c v\u1eadt:<\/b><\/p>\n<p>T\u1ef7 l\u1ec7 s\u1ed1ng, H, D kh\u00f4ng c\u00f3 s\u1ef1 kh\u00e1c bi\u1ec7t v\u1ec1 m\u1eb7t th\u1ed1ng k\u00ea \u00e0 Bi\u1ec7n ph\u00e1p ki\u1ec3m so\u00e1t c\u1ecf d\u1ea1i b\u1eb1ng ph\u01b0\u01a1ng ph\u00e1p th\u1ee7 c\u00f4ng kh\u00f4ng mang l\u1ea1i hi\u1ec7u qu\u1ea3\u00a0 so v\u1edbi bi\u1ec7n ph\u00e1p d\u00f9ng thu\u1ed1c di\u1ec7t c\u1ecf \u0111\u00e3 \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n t\u1ea1i B\u00ecnh D\u01b0\u01a1ng<\/p>\n<p><b>Th\u00ed nghi\u1ec7m qu\u1ea3n l\u00fd dinh d\u01b0\u1ee1ng<\/b><\/p>\n<p>Sau 6 th\u00e1ng, t\u1ef7 l\u1ec7 s\u1ed1ng kh\u00f4ng c\u00f3 kh\u00e1c bi\u1ec7t gi\u1eefa c\u00e1c nghi\u1ec7m th\u1ee9c.<\/p>\n<p>Trong khi \u0111\u00f3, D v\u00e0 H c\u1ee7a c\u00e1c nghi\u1ec7m th\u1ee9c \u0111\u01b0\u1ee3c b\u00f3n P \u0111\u1ec1u c\u00f3 s\u1ef1 kh\u00e1c bi\u1ec7t, ch\u1ee9ng t\u1ecf vai tr\u00f2 c\u1ee7a ph\u00e2n l\u00e2n trong giai \u0111o\u1ea1n \u0111\u1ea7u khi tr\u1ed3ng r\u1eebng. C\u1ee5 th\u1ec3, chi\u1ec1u cao \u1edf nghi\u1ec7m th\u1ee9c F2- F4 c\u00f3 b\u00f3n t\u1eeb 278 -1112 g P<sub>2<\/sub>0<sub>5<\/sub> \u0111\u00e3 \u0111\u1ea1t gi\u00e1 tr\u1ecb cao nh\u1ea5t 0.9 m, g\u1ea5p 1,5 l\u1ea7n so \u0111\u1ed1i ch\u1ee9ng ch\u1ec9 c\u00f3 0.6 m v\u00e0 h\u01a1n kho\u1ea3ng 1,3 l\u1ea7n v\u1ec1 \u0111\u01b0\u1eddng k\u00ednh.<\/p>\n<p><b>Th\u00ed nghi\u1ec7m t\u1ec9a th\u01b0a<\/b><\/p>\n<p>Nh\u01b0 v\u1eady \u0111\u00e3 c\u00f3 s\u1ef1 ch\u00eanh l\u1ec7ch v\u1ec1 sinh tr\u01b0\u1edfng chi\u1ec1u cao, \u0111\u01b0\u1eddng k\u00ednh gi\u1eefa c\u00e1c m\u1ee9c \u0111\u1ed9 t\u1ec9a th\u01b0a kh\u00e1c nhau. Theo \u0111\u00f3, t\u1ec9a 67 % \u0111\u00e3 t\u0103ng 2,8% chi\u1ec1u cao, 13,4 % \u0111\u01b0\u1eddng k\u00ednh so v\u1edbi \u0111\u1ed1i ch\u1ee9ng (kh\u00f4ng t\u1ec9a). C\u00e1c ch\u1ec9 s\u1ed1 t\u01b0\u01a1ng t\u1ef1 v\u1edbi c\u01b0\u1eddng \u0111\u1ed9 t\u1ec9a 50% l\u00e0: 3,8%, 6,7% v\u00e0 t\u1ec9a 33% l\u00e0: 0,9%, 2,2%.<\/p>\n<p><b>T\u1ea1i mi\u1ec1n B\u1eafc \u2013 C\u00e2y b\u1ea1ch \u0111\u00e0n<\/b><\/p>\n<p><b>\u1ea2nh h\u01b0\u1edfng c\u1ee7a qu\u1ea3n l\u00fd <\/b><b>VLHC<\/b><b>SKT \u0111\u1ebfn r\u1eebng tr\u1ed3ng<\/b><\/p>\n<p>Sau 2 n\u0103m, c\u00f3 s\u1ef1 kh\u00e1c bi\u1ec7t v\u1ec1 D gi\u1eefa c\u00e1c nghi\u1ec7m th\u1ee9c v\u1edbi p = 0,006. V\u1ec1 H, hai nghi\u1ec7m th\u1ee9c \u0111\u1ec3 l\u1ea1i VLHCSKT c\u00f3 H v\u01b0\u1ee3t tr\u1ed9i h\u01a1n 2 nghi\u1ec7m th\u1ee9c c\u00f2n l\u1ea1i. S\u1ef1 sai kh\u00e1c n\u00e0y c\u00f3 \u00fd ngh\u0129a v\u1ec1 c\u00e1c ch\u1ec9 s\u1ed1 th\u1ed1ng k\u00ea (p = 0,005).<b> <\/b><\/p>\n<p>Tr\u1eef l\u01b0\u1ee3ng v\u00e0 sinh kh\u1ed1i r\u1eebng gi\u1eefa c\u00e1c nghi\u1ec7m th\u1ee9c c\u00f3 s\u1ef1 kh\u00e1c bi\u1ec7t r\u1ea5t r\u00f5 r\u1ec7t v\u1ec1 th\u1ed1ng k\u00ea. \u1ede nghi\u1ec7m th\u1ee9c \u0111\u1ec3 l\u1ea1i g\u1ea5p \u0111\u00f4i l\u01b0\u1ee3ng VLHCSKT (BL<sub>2-2<\/sub>) cho tr\u1eef l\u01b0\u1ee3ng r\u1eebng g\u1ea5p 2 l\u1ea7n v\u00e0 sinh kh\u1ed1i g\u1ea5p 1,5 l\u1ea7n so v\u1edbi nghi\u1ec7m th\u1ee9c kh\u00f4ng \u0111\u1ec3 l\u1ea1i (Blo). \u0110\u1ebfn n\u0103m th\u1ee9 2, tr\u1eef l\u01b0\u1ee3ng c\u00f4ng th\u1ee9c gi\u1eef l\u1ea1i v\u1eadt li\u1ec7u h\u1eefu c\u01a1\u00a0 BL<sub>2-2<\/sub> v\u1eabn cao t\u0103ng t\u1edbi 35 % so v\u1edbi \u0111\u1ed1i ch\u1ee9ng.<\/p>\n<p><b>V\u1ec1 L\u00e2n d\u1ec5 ti\u00eau:<\/b><\/p>\n<p>\u0097\u00a0 N\u0103m 2009 (c\u1ed9t m\u00e0u n\u00e2u) h\u00e0m l\u01b0\u1ee3ng l\u00e2n t\u0103ng cao \u0111\u1ed9t bi\u1ebfn, l\u00ed do c\u00f3 th\u1ec3 l\u00e0 kh\u00f4ng c\u00f2n r\u1eebng v\u00ec r\u1eebng v\u1eeba khai th\u00e1c, l\u01b0\u1ee3ng l\u00e2n kh\u00f4ng b\u1ecb qu\u1ea7n th\u1ee5 r\u1eebng s\u1eed d\u1ee5ng nh\u01b0 tr\u01b0\u1edbc khai th\u00e1c \u0111\u01b0\u1ee3c ph\u00e2n t\u00edch n\u0103m 2008.<\/p>\n<p>\u0097\u00a0 \u0110\u1ebfn n\u0103m 2010 (m\u00e0u xanh l\u00e1), h\u00e0m l\u01b0\u1ee3ng l\u00e2n b\u1eaft \u0111\u1ea7u gi\u1ea3m do tr\u1ed3ng r\u1eebng m\u1edbi nh\u01b0ng c\u00f3 xu h\u01b0\u1edbng ph\u1ee5c h\u1ed3i v\u00e0 theo h\u01b0\u1edbng l\u1edbn d\u1ea7n v\u1ec1 c\u00e1c c\u00f4ng th\u1ee9c c\u00f3 qu\u1ea3n l\u00fd VLHCSKT, th\u1ea5p nh\u1ea5t l\u00e0 \u0111\u1ed1i ch\u1ee9ng (\u0111\u1ed1t), k\u1ebf \u0111\u1ebfn l\u00e0 l\u1ea5y h\u1ebft VLHSKT nh\u01b0 Blo.<\/p>\n<p><b>V\u1ec1 \u0110\u1ea1m d\u1ec5 ti\u00eau:<\/b><\/p>\n<p>N\u0103m 2009 h\u00e0m l\u01b0\u1ee3ng \u0111\u1ea1m kh\u00f4ng c\u00f3 s\u1ef1 kh\u00e1c bi\u1ec7t gi\u1eefa c\u00e1c th\u00ed nghi\u1ec7m.<\/p>\n<p>N\u0103m 2010, b\u1eaft \u0111\u1ea7u c\u00f3 s\u1ef1 kh\u00e1c bi\u1ec7t theo h\u01b0\u1edbng h\u00e0m l\u01b0\u1ee3ng \u0111\u1ea1m t\u0103ng d\u1ea7n t\u1eeb \u0111\u1ed1i ch\u1ee9ng (\u0111\u1ed1t h\u1ebft VLHCSKT), \u0111\u1ebfn Blo v\u00e0 cao h\u01a1n c\u1ea3 l\u00e0 BL<sub>2-2<\/sub> (gi\u1eef g\u1ea5p \u0111\u00f4i l\u01b0\u1ee3ng VLHCSKT).<\/p>\n<p><b>V\u1ec1 M\u00f9n (C):<\/b><\/p>\n<p>N\u0103m 2009 v\u00e0 2010, l\u01b0\u1ee3ng ch\u1ea5t h\u1eefu c\u01a1 c\u0169ng \u0111\u01b0\u1ee3c c\u1ea3i thi\u1ec7n theo h\u01b0\u1edbng t\u0103ng d\u1ea7n gi\u1eefa c\u00e1c nghi\u1ec7m th\u1ee9c v\u1ec1 gi\u1eef l\u1ea1i VLHCSKT.<\/p>\n<p>\u01a0 t\u1ea7ng 0-10 cm, n\u01a1i gi\u1eef lai VLHC l\u1edbn nh\u1ea5t th\u00ec sau 2 n\u0103m h\u00e0m l\u01b0\u1ee3ng m\u00f9n \u0111\u00e3 t\u0103ng 54,8 % so \u0111\u1ed1i ch\u1ee9ng (1,92 so v\u1edbi 1,24 %);<\/p>\n<p>\u1ede t\u1ea7ng 10-20 cm, \u0111\u00e3 t\u0103ng 38,4 % (1,26 so v\u1edbi 0,91%).<\/p>\n<p><b>Th\u00ed nghi\u1ec7m qu\u1ea3n l\u00fd th\u1ef1c v\u1eadt<\/b><\/p>\n<p>Nghi\u1ec7m th\u1ee9c phun thu\u1ed1c di\u1ec7t c\u1ecf to\u00e0n di\u1ec7n 1 v\u00e0 2 l\u1ea7n\/n\u0103m b\u01b0\u1edbc \u0111\u1ea7u t\u1ecf ra \u01b0u vi\u1ec7t h\u01a1n c\u00e1c nghi\u1ec7m th\u1ee9c\u00a0 kh\u00e1c. Sinh tr\u01b0\u1edfng D<sub>1.3 <\/sub>v\u00e0 H<sub>vn<\/sub> gi\u1eefa c\u00e1c nghi\u1ec7m th\u1ee9c c\u00f3 s\u1ef1 kh\u00e1c bi\u1ec7t\u00a0 r\u1ea5t r\u00f5 r\u1ec7t v\u1ec1 th\u1ed1ng k\u00ea v\u1edbi p &lt; 0,001 v\u00e0 p = 0,002.<\/p>\n<p><b>Th\u00ed nghi\u1ec7m qu\u1ea3n l\u00fd dinh d\u01b0\u1ee1ng<\/b><\/p>\n<p>Sau 12 th\u00e1ng,\u00a0 D v\u00e0 H kh\u00e1c bi\u1ec7t r\u00f5 r\u1ec7t v\u1ec1 th\u1ed1ng k\u00ea (p &lt; 0,001). C\u00e1c nghi\u1ec7m th\u1ee9c c\u00f3 b\u00f3n ph\u00e2n, sinh tr\u01b0\u1edfng D v\u01b0\u1ee3t tr\u1ed9i h\u01a1n nhi\u1ec1u so\u00a0 \u0111\u1ed1i ch\u1ee9ng. Sinh tr\u01b0\u1edfng v\u1ec1 \u0111\u01b0\u1eddng k\u00ednh v\u00e0 chi\u1ec1u cao gi\u1eefa 4 l\u1ea7n l\u1eb7p c\u00f3 \u0111\u1ed9 bi\u1ebfn \u0111\u1ed9ng r\u1ea5t th\u1ea5p (CV = 1,7 \u2013 2,2%), \u0111i\u1ec1u n\u00e0y cho th\u1ea5y r\u1eebng sinh tr\u01b0\u1edfng t\u01b0\u01a1ng \u0111\u1ed1i \u0111\u1ed3ng \u0111\u1ec1u.<\/p>\n<p><b>Th\u00ed nghi\u1ec7m t\u1ec9a th\u01b0a r\u1eebng<\/b><\/p>\n<p>Sau t\u1ec9a 1 n\u0103m, sinh tr\u01b0\u1edfng \u00a0\u0111\u00e3 b\u00f9 \u0111\u01b0\u1ee3c tr\u1eef l\u01b0\u1ee3ng l\u1ea5y ra. Tuy nhi\u00ean \u0111\u1ed9 bi\u1ebfn \u0111\u1ed9ng c\u1ee7a tr\u1eef l\u01b0\u1ee3ng r\u1eebng \u1edf c\u00e1c l\u1ea7n l\u1eb7p kh\u00e1 cao (10,5%). Sinh tr\u01b0\u1edfng D v\u00e0 H \u1edf \u0111\u01b0\u1ee3c c\u1ea3i thi\u1ec7n r\u1ea5t r\u00f5 t\u1ea1i T3 v\u00e0 T4. L\u01b0\u1ee3ng t\u0103ng tr\u01b0\u1edfng h\u00e0ng n\u0103m Z (m<sup>3<\/sup>\/ha\/n\u0103m) \u1edf m\u1eadt \u0111\u1ed9 t\u1ec9a c\u00f2n l\u1ea1i\u00a0 660 c\u00e2y\/ha c\u00f3 Z t\u1eeb 13,2 \u2013 16,2 m<sup>3<\/sup>\/ha\/n\u0103m, c\u00f2n \u1edf m\u1eadt \u0111\u1ed9 th\u01b0a 460 c\u00e2y\/ha c\u00f3 Z th\u1ea5p nh\u1ea5t (11 m<sup>3<\/sup>\/ha\/n\u0103m) do s\u1ed1 c\u00e2y c\u00f2n \u00edt.<\/p>\n<p><b>VI. K\u1ebeT LU\u1eacN V\u00c0 \u0110\u1ec0 NGH\u1eca<\/b><\/p>\n<p><b>K\u1ebft lu\u1eadn:<\/b><\/p>\n<p>\u0097\u00a0 Vi\u1ec7c qu\u1ea3n l\u00fd\u00a0 VLHCSKT \u0111\u00e3 n\u00e2ng cao sinh tr\u01b0\u1edfng, sinh kh\u1ed1i, dinh d\u01b0\u1ee1ng trong c\u00e2y c\u1ee7a r\u1eebng l\u00ean r\u00f5 r\u1ec7t theo c\u00e1c m\u1ee9c \u0111\u1ed9 gi\u1eef l\u1ea1i l\u01b0\u1ee3ng v\u1eadt li\u1ec7u h\u1eefu c\u01a1 kh\u00e1c nhau.<\/p>\n<p>\u0097\u00a0 C\u00e1c ch\u1ec9 s\u1ed1 v\u1ec1 dinh d\u01b0\u1ee1ng \u0111\u1ea5t ch\u1ee7 y\u1ebfu nh\u01b0 m\u00f9n (C), l\u00e2n d\u1ec5 ti\u00eau (Pdt) v\u00e0 \u0111\u1ea1m d\u1ec5 ti\u00eau (Ndt) trong \u0111\u1ea5t t\u0103ng d\u1ea7n theo c\u00e1c nghi\u1ec7m th\u1ee9c qu\u1ea3n l\u00ed VLHCSKT.\u00a0 \u00e0\u0110i\u1ec1u n\u00e0y cho th\u1ea5y \u0111\u1ed9 ph\u00ec nhi\u00eau c\u1ee7a \u0111\u1ea5t \u0111ang \u0111\u01b0\u1ee3c c\u1ea3i thi\u1ec7n d\u1ea7n, r\u00f5 nh\u1ea5t l\u00e0 th\u00ed nghi\u1ec7m t\u1ea1i ph\u00eda Nam do \u0111\u00e3 qua th\u00eam 1 chu k\u1ef3 qu\u1ea3n VLHCSKT do d\u1ef1 \u00e1n CIFOR th\u1ef1c hi\u1ec7n.<\/p>\n<p>Ki\u1ec3m so\u00e1t m\u1eadt \u0111\u1ed9 c\u00e2y qua\u00a0 t\u1ec9a th\u01b0a cho th\u1ea5y \u0111\u00e3 c\u1ea3i thi\u1ec7n sinh tr\u01b0\u1edfng c\u1ee7a c\u00e2y c\u00e1 th\u1ec3, gi\u1ea3m c\u1ea1nh tranh dinh d\u01b0\u1ee1ng t\u1eeb \u0111\u1ea5t v\u00e0 kh\u00f4ng gian s\u1ed1ng. Tuy nhi\u00ean, c\u1ea7n theo d\u00f5i ch\u1ea5t l\u01b0\u1ee3ng c\u00e2y sau t\u1ec9a \u0111\u1ec3 t\u0103ng gi\u00e1 tr\u1ecb g\u1ed7 x\u1ebb v\u00e0 t\u00ednh to\u00e1n c\u00e2n b\u1eb1ng dinh d\u01b0\u1ee1ng gi\u1eefa c\u00e1c nghi\u1ec7m th\u1ee9c t\u1ec9a th\u01b0a.<\/p>\n<p>Th\u1eddi gian c\u00f2n ng\u1eafn ch\u01b0a \u0111\u1ee7 \u0111\u1ec3 so s\u00e1nh hi\u1ec7u q\u1ee7a kinh t\u1ebf c\u1ee7a c\u00e1c gi\u1ea3i ph\u00e1p qu\u1ea3n l\u00fd l\u1eadp \u0111\u1ecba \u0111\u1ed1i v\u1edbi n\u0103ng su\u1ea5t r\u1eebng v\u00e0 \u0111\u1ed9 ph\u00ec \u0111\u1ea5t gi\u1eefa c\u00e1c chu k\u1ef3 tr\u1ed3ng r\u1eebng (tr\u01b0\u1edbc khi khai th\u00e1c v\u00e0 sau khi tr\u1ed3ng l\u1ea1i m\u1edbi).<\/p>\n<p>\u0110\u1ea5t tr\u1ed3ng r\u1eebng \u1edf c\u00e1c 3 v\u00f9ng \u0111\u1ec1u r\u1ea5t thi\u1ebfu l\u00e2n v\u00e0\u00a0 vi\u1ec7c b\u1ed5 sung L\u00e2n qua th\u00ed nghi\u1ec7m qu\u1ea3n l\u00ed dinh d\u01b0\u1ee1ng \u0111\u00e3 g\u00f3p ph\u1ea7n \u0111\u1ecbnh h\u01b0\u1edbng s\u1eed d\u1ee5ng l\u00e2n trong tr\u1ed3ng r\u1eebng.<\/p>\n<p>Vi\u1ec7c qu\u1ea3n l\u00ed th\u1ea3m th\u1ef1c v\u1eadt v\u1edbi c\u00e1c gi\u1ea3i ph\u00e1p b\u1eb1ng th\u1ee7 c\u00f4ng hay d\u00f9ng thu\u1ed1c di\u1ec7t c\u1ecf \u0111\u1ec1u c\u00f3 \u00fd ngh\u0129a \u1edf c\u00e1c m\u1ee9c \u0111\u1ed9 kh\u00e1c nhau \u0111\u1ebfn sinh tr\u01b0\u1edfng c\u1ee7a r\u1eebng. C\u00f3 n\u01a1i th\u1ec3 hi\u1ec7n kh\u00e1 r\u00f5 nh\u01b0 t\u1ea1i Tam Thanh, nh\u01b0ng c\u00f3 n\u01a1i ch\u01b0a th\u1ec3 hi\u1ec7n r\u00f5 nh\u01b0 t\u1ea1i B\u00ecnh Ph\u01b0\u1edbc, B\u00ecnh \u0110\u1ecbnh.<\/p>\n<p><b>\u0110\u1ec1 ngh\u1ecb:<\/b><\/p>\n<p>C\u1ea7n c\u00f3 qui ho\u1ea1ch v\u00f9ng nguy\u00ean li\u1ec7u tr\u1ed3ng r\u1eebng g\u1eafn li\u1ec1n v\u1edbi qui ho\u1ea1ch d\u00e2n c\u01b0 m\u1ed9t c\u00e1ch khoa h\u1ecdc th\u00ec vi\u1ec7c \u00e1p d\u1ee5ng c\u00f4ng ngh\u1ec7 qu\u1ea3n l\u00fd v\u1eadt li\u1ec7u h\u1eefu c\u01a1 m\u1edbi th\u1ef1c s\u1ef1 c\u00f3 hi\u1ec7u q\u1ee7a nh\u01b0 c\u00e1c c\u00f4ng ty tr\u1ed3ng r\u1eebng l\u1edbn tr\u00ean th\u1ebf gi\u1edbi \u0111\u00e3 l\u00e0m t\u1ea1i Chi-l\u00ea, Brazil, Indonexia, Trung qu\u1ed1c\u2026B\u1edfi v\u00ec: gi\u1eef VLHCSKT hi\u1ec7n l\u00e0 v\u1ea5n \u0111\u1ec1 r\u1ea5t kh\u00f3 \u1edf Vi\u1ec7t Nam.<b> <\/b><\/p>\n","protected":false},"excerpt":{"rendered":"<p>TS. Ph\u1ea1m Th\u1ebf D\u0169ng I. \u0110\u1eb6T V\u1ea4N \u0110\u1ec0 &#8211; T\u1ed4NG QUAN C\u00c1C NGHI\u00caN C\u1ee8U B\u1ea1ch \u0111\u00e0n v\u00e0 keo \u0111ang l\u00e0 c\u00e2y ch\u1ee7 l\u1ef1c trong tr\u1ed3ng c\u00f4ng nghi\u1ec7p, chi\u1ebfm t\u1edbi 46% t\u1ed5ng di\u1ec7n t\u00edch r\u1eebng tr\u1ed3ng v\u00e0 c\u00f3 xu h\u01b0\u1edbng t\u0103ng. Khuynh h\u01b0\u1edbng suy gi\u1ea3m n\u0103ng su\u1ea5t r\u1eebng sau nhi\u1ec1u chu k\u1ef3 kinh doanh \u0111\u00e3 \u0111\u01b0\u1ee3c [&hellip;]<\/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\/13198"}],"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=13198"}],"version-history":[{"count":3,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/posts\/13198\/revisions"}],"predecessor-version":[{"id":13214,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/posts\/13198\/revisions\/13214"}],"wp:attachment":[{"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/media?parent=13198"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/categories?post=13198"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/tags?post=13198"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}