{"id":8613,"date":"2009-03-24T02:29:30","date_gmt":"2009-03-23T19:29:30","guid":{"rendered":"http:\/\/vafs.gov.vn\/vn\/2009\/03\/anh-huong-cua-che-do-anh-sang-toi-sinh-truong-cua-cay-con-vang-trung-endospermum-chinense-benth-trong-giai-doan-vuon-uom\/"},"modified":"2019-09-25T10:11:06","modified_gmt":"2019-09-25T03:11:06","slug":"anh-huong-cua-che-do-anh-sang-toi-sinh-truong-cua-cay-con-vang-trung-endospermum-chinense-benth-trong-giai-doan-vuon-uom","status":"publish","type":"post","link":"https:\/\/vafs.gov.vn\/vn\/anh-huong-cua-che-do-anh-sang-toi-sinh-truong-cua-cay-con-vang-trung-endospermum-chinense-benth-trong-giai-doan-vuon-uom\/","title":{"rendered":"\u1ea3nh h\u01b0\u1edfng c\u1ee7a ch\u1ebf \u0111\u1ed9 \u00e1nh s\u00e1ng t\u1edbi sinh tr\u01b0\u1edfng c\u1ee7a c\u00e2y con V\u1ea1ng tr\u1ee9ng (Endospermum chinense Benth) trong giai \u0111o\u1ea1n v\u01b0\u1eddn \u01b0\u01a1m"},"content":{"rendered":"

\u0110\u1eb7ng Th\u1ecbnh Tri\u1ec1u<\/em><\/strong><\/p>\n

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

\u0110\u1eb7t v\u1ea5n \u0111\u1ec1<\/strong>:<\/p>\n

\u00e1nhs\u00e1ng l\u00e0 m\u1ed9t trong nh\u1eefng nh\u00e2n t\u1ed1 sinh t\u1ed3n \u0111\u1ed1i v\u1edbi sinh tr\u01b0\u1edfng v\u00e0 ph\u00e1t tri\u1ec3n c\u1ee7a th\u1ef1c v\u1eadt. \u00e1nhs\u00e1ng kh\u00f4ng nh\u1eefng c\u00f3 t\u00e1c d\u1ee5ng tr\u1ef1c ti\u1ebfp \u0111\u1ebfn quang h\u1ee3p m\u00e0 c\u00f2n c\u00f3 t\u00e1c d\u1ee5ng \u0111\u1ebfn qu\u00e1 tr\u00ecnh tho\u00e1t h\u01a1i n\u01b0\u1edbc, qu\u00e1 tr\u00ecnh h\u00f4 h\u1ea5p. V\u00ec th\u1ebf,\u00e1nh s\u00e1ng c\u00f3 \u1ea3nh h\u01b0\u1edfng nhi\u1ec1u m\u1eb7t \u0111\u1ebfn to\u00e0n b\u1ed9 \u0111\u1eddi s\u1ed1ng c\u1ee7a th\u1ef1c v\u1eadt t\u1eeb khi h\u1ea1t n\u1ea3y m\u1ea7m, c\u00e2y ra hoa k\u1ebft qu\u1ea3cho \u0111\u1ebfn khi ch\u1ebft. Tuy nhi\u00ean,c\u00e1c lo\u00e0i c\u00e2y kh\u00e1c nhau c\u00f3 t\u00ednh th\u00edch \u1ee9ng sinh th\u00e1i kh\u00e1c nhau \u0111\u1ed1i v\u1edbi \u0111i\u1ec1u ki\u1ec7n chi\u1ebfu s\u00e1ng (Denslow 1980, Popma v\u00e0 Bongers 1988), ngo\u00e0i ra nhu c\u1ea7u \u00e1nh s\u00e1ng c\u0169ng ph\u1ee5 thu\u1ed9c v\u00e0o t\u1eebng giai \u0111o\u1ea1n ph\u00e1t tri\u1ec3n c\u1ee7a th\u1ef1c v\u1eadt (L\u00e2m Xu\u00e2n Sanh, 1965).<\/p>\n

Nghi\u00ean c\u1ee9u nhu c\u1ea7u \u00e1nh s\u00e1ng c\u1ee7a c\u00e2y r\u1eebng \u0111\u00e3 \u0111\u01b0\u1ee3c nhi\u1ec1u nh\u00e0 L\u00e2m h\u1ecdc ch\u00fa \u00fd. Tr\u00ean c\u01a1 s\u1edf nh\u1eefng nghi\u00ean c\u1ee9u \u0111\u00f3, ta c\u00f3 th\u1ec3 \u0111o\u00e1n tr\u01b0\u1edbc \u0111\u01b0\u1ee3c nhu c\u1ea7u \u00e1nh s\u00e1ng c\u1ee7a c\u00e2y r\u1eebng trong \u0111i\u1ec1u ki\u1ec7n t\u00e1i sinh t\u1ef1 nhi\u00ean ho\u1eb7c \u0111\u01b0a ra nh\u1eefng bi\u1ec7n ph\u00e1p l\u00e2m sinh th\u00edch h\u1ee3p trong kinh doanh r\u1eebng. N\u0103m 1966 Nguy\u1ec5n H\u1eefu Th\u01b0\u1edbc v\u00e0 c\u00e1c c\u1ed9ng s\u1ef1 \u0111\u00e3 nghi\u00ean c\u1ee9u nhu c\u1ea7u \u00e1nh s\u00e1ng c\u1ee7a c\u00e2y Lim, v\u1edbi m\u1ee9c che s\u00e1ng 50% sinh tr\u01b0\u1edfng v\u1ec1 chi\u1ec1u cao, \u0111\u01b0\u1eddng k\u00ednh v\u00e0 t\u1ed5ng l\u01b0\u1ee3ng h\u1eefu c\u01a1 cho k\u1ebft qu\u1ea3 t\u1ed1t nh\u1ea5t. V\u1edbi nh\u1eefng nghi\u00ean c\u1ee9u t\u01b0\u01a1ng t\u1ef1, L\u00e2m C\u00f4ng \u0110\u1ecbnh (1964)\u0111\u00e3 khuy\u1ebfn c\u00e1o \u1edf m\u1ee9c \u0111\u1ed9 75% c\u01b0\u1eddng \u0111\u1ed9 \u00e1nh s\u00e1ng l\u00e0 \u0111i\u1ec1u ki\u1ec7n t\u1ed1t nh\u1ea5t cho sinh tr\u01b0\u1edfng c\u1ee7a m\u1ee1 trong giai \u0111o\u1ea1n 100 – 110 ng\u00e0y tu\u1ed5i. Sasaki v\u00e0 Mori (1981) \u0111\u00e3 \u0111\u00e1nh gi\u00e1 kh\u1ea3 n\u0103ng ch\u1ecbu b\u00f3ng c\u1ee7a m\u1ed9t s\u1ed1 lo\u00e0i nh\u01b0: Shorea talura<\/em>, S. ovalis<\/em>, Hopea helferei<\/em> v\u00e0 Vatica odorata<\/em>. K\u1ebft qu\u1ea3 cho th\u1ea5y sinh tr\u01b0\u1edfng c\u1ee7a c\u00e2y con b\u1ecb \u1ee9c ch\u1ebf khi c\u01b0\u1eddng \u0111\u1ed9 \u00e1nh s\u00e1ng cao h\u01a1n 50%. \u0110\u1ed1i v\u1edbi c\u00e2y H\u1ed3i (Illicium verum<\/em> Hook), c\u1ea5u t\u1ea1o gi\u1ea3i ph\u1eabu c\u1ee7a l\u00e1, ho\u1ea1t \u0111\u1ed9ng trao \u0111\u1ed5i n\u01b0\u1edbc v\u00e0 s\u1ef1 t\u00edch lu\u1ef9 di\u1ec7p l\u1ee5c c\u0169ng nh\u01b0 N. P. K trong l\u00e1 thay \u0111\u1ed5i d\u01b0\u1edbi c\u00e1c \u0111i\u1ec1u ki\u1ec7n chi\u1ebfu s\u00e1ng kh\u00e1c nhau. T\u1ef7 l\u1ec7 che s\u00e1ng 60% l\u00e0 ph\u00f9 h\u1ee3p nh\u1ea5t cho sinh tr\u01b0\u1edfng c\u1ee7a c\u00e2y trong giai \u0111o\u1ea1n v\u01b0\u1eddn \u01b0\u01a1m, (Nguy\u1ec5n Ng\u1ecdc T\u00e2n, 1989).<\/p>\n

V\u1ea1ng tr\u1ee9ng (Endospermum chinense<\/em> Benth) l\u00e0 c\u00e2y \u01b0a s\u00e1ng, tuy nhi\u00ean trong giai \u0111o\u1ea1n v\u01b0\u1eddn \u01b0\u01a1m c\u1ea7n \u0111\u01b0\u1ee3c che b\u00f3ng (C\u00f4ng ty gi\u1ed1ng v\u00e0 Ph\u1ee5c v\u1ee5 tr\u1ed3ng r\u1eebng 1995). T\u1ef7 l\u1ec7 che s\u00e1ng cho V\u1ea1ng tr\u1ee9ng trong giai \u0111o\u1ea1n v\u01b0\u1eddn \u01b0\u01a1m \u0111\u00e3 \u0111\u01b0\u1ee3c m\u1ed9t s\u1ed1 t\u00e0i li\u1ec7u \u0111\u1ec1 c\u1eadp (C\u00f4ng ty gi\u1ed1ng v\u00e0 ph\u1ee5c v\u1ee5 tr\u1ed3ng r\u1eebng 1995, V\u1ee5 Khoa h\u1ecdc c\u00f4ng ngh\u1ec7 1994). Tuy nhi\u00ean, \u1ea3nh h\u01b0\u1edfng c\u1ee5 th\u1ec3 c\u1ee7a ch\u1ebf \u0111\u1ed9 s\u00e1ng \u0111\u1ebfn sinh tr\u01b0\u1edfng c\u1ee7a c\u00e2y con nh\u01b0 th\u1ebf n\u00e0o th\u00ec ch\u01b0a c\u00f3 t\u00e0i li\u1ec7u n\u00e0o \u0111\u01b0\u1ee3c xu\u1ea5t b\u1ea3n. Nghi\u00ean c\u1ee9u n\u00e0y g\u00f3p th\u00eam s\u1ef1 hi\u1ec3u bi\u1ebft v\u1ec1 \u0111\u1eb7c t\u00ednh sinh h\u1ecdc c\u1ee7a lo\u00e0i c\u00e2y n\u00e0y trong giai \u0111o\u1ea1n v\u01b0\u1eddn \u01b0\u01a1m.<\/p>\n

Ph\u01b0\u01a1ng ph\u00e1p nghi\u00ean c\u1ee9u<\/h3>\n

Th\u00ed nghi\u1ec7m \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n t\u1ea1i V\u01b0\u1eddn th\u1ef1c nghi\u1ec7m Trung t\u00e2m Sinh Th\u00e1i v\u00e0 T\u00e0i nguy\u00ean m\u00f4i tr\u01b0\u1eddng- Vi\u1ec7n Khoa h\u1ecdc L\u00e2m nghi\u1ec7p Vi\u1ec7t Nam – T\u1eeb Li\u00eam – H\u00e0 N\u1ed9i t\u1eeb th\u00e1ng 12 n\u0103m 2000 \u0111\u1ebfn th\u00e1ng 6 n\u0103m 2001. C\u00e2y con \u0111\u01b0\u1ee3c l\u1ea5y t\u1eeb Trung T\u00e2m th\u1ef1c nghi\u1ec7m L\u00e2m sinh C\u1ea7u Hai. Khi c\u00e2y \u0111\u01b0\u1ee3c 3 th\u00e1ng tu\u1ed5i th\u00ec th\u00ed nghi\u1ec7m \u0111\u01b0\u1ee3c b\u1eaft \u0111\u1ea7u v\u1edbi b\u1ed1n ch\u1ebf \u0111\u1ed9 \u00e1nh s\u00e1ng l\u00e0 100%; 80%; 50% v\u00e0 20%. \u0110\u1ec3 t\u1ea1o c\u00e1c m\u1ee9c \u0111\u1ed9 chi\u1ebfu s\u00e1ng kh\u00e1c nhau, c\u00e2y con \u0111\u01b0\u1ee3c \u0111\u1eb7t trong c\u00e1c h\u1ed9p c\u00f3 k\u00edch th\u01b0\u1edbc 2,5 m chi\u1ec1u r\u1ed9ng x 4,5 m chi\u1ec1u d\u00e0i x 2,0 m chi\u1ec1u cao v\u00e0 \u0111\u01b0\u1ee3c che b\u1eb1ng l\u01b0\u1edbi nylon m\u00e0u \u0111en v\u1edbi c\u00e1c \u0111\u1ed9 che s\u00e1ng t\u01b0\u01a1ng \u1ee9ng. \u0110\u1ea5t d\u00f9ng cho th\u00ed nghi\u1ec7m l\u00e0 \u0111\u1ea5t ph\u00f9 sa s\u00f4ng H\u1ed3ng. M\u1ed9t s\u1ed1 l\u00fd t\u00ednh v\u00e0 ho\u00e1 t\u00ednh c\u1ee7a \u0111\u1ea5t \u0111\u01b0\u1ee3c tr\u00ecnh b\u00e0y trong b\u1ea3ng 1. T\u00fai b\u1ea7u Poly-etylen v\u1edbi k\u00edch th\u01b0\u1edbc 6,3 cm \u0111\u01b0\u1eddng k\u00ednh x 14cm chi\u1ec1u cao. Trong su\u1ed1t qu\u00e1 tr\u00ecnh th\u00ed nghi\u1ec7m, c\u00e2y con \u0111\u01b0\u1ee3c t\u01b0\u1edbi n\u01b0\u1edbc h\u00e0ng ng\u00e0y, m\u1eb7t b\u1ea7u \u0111\u01b0\u1ee3c ph\u00e1 v\u00e1ng \u0111\u1ecbnh k\u1ef3 \u0111\u1ec3 thu\u1eadn l\u1ee3i cho vi\u1ec7c th\u1ea5m n\u01b0\u1edbc c\u0169ng nh\u01b0 ng\u0103n c\u1ea3n s\u1ef1 ph\u00e1t tri\u1ec3n c\u1ee7a c\u1ecf v\u00e0 r\u00eau.<\/p>\n

C\u00e1c ch\u1ec9 ti\u00eau \u0111o \u0111\u1ebfm g\u1ed3m: S\u1ed1 l\u00e1, \u0111\u01b0\u1eddng k\u00ednh c\u1ed5 r\u1ec5 v\u00e0 chi\u1ec1u cao \u0111\u01b0\u1ee3c \u0111o 2 tu\u1ea7n m\u1ed9t l\u1ea7n. Khi th\u00ed nghi\u1ec7m k\u1ebft th\u00fac, c\u00e2y con \u0111\u01b0\u1ee3c thu ho\u1ea1ch v\u00e0 chia th\u00e0nh r\u1ec5, th\u00e2n v\u00e0 l\u00e1. Di\u1ec7n t\u00edch l\u00e1 \u0111\u01b0\u1ee3c \u0111o ngay sau khi thu ho\u1ea1ch. Sau khi s\u1ea5y \u1edf 70oC<\/sup> cho \u0111\u1ebfn khi tr\u1ecdng l\u01b0\u1ee3ng kh\u00f4ng thay \u0111\u1ed5i. R\u1ec5, th\u00e2n l\u00e1 \u0111\u01b0\u1ee3c c\u00e2n \u0111\u1ec3 t\u00ednh tr\u1ecdng l\u01b0\u1ee3ng kh\u00f4 cho c\u00e1c ph\u1ea7n t\u01b0\u01a1ng \u1ee9ng.<\/p>\n

S\u1ed1 li\u1ec7u \u0111\u01b0\u1ee3c x\u1eed l\u00fd b\u1edfi ch\u01b0\u01a1ng tr\u00ecnh SPSS (Statistical Packageof Social Sciences). Duncan\u2019s New Multiple Range Test \u0111\u01b0\u1ee3c d\u00f9ng \u0111\u1ec3 so s\u00e1nh gi\u00e1 tr\u1ecb trung b\u00ecnh cho t\u1ea5t c\u1ea3 c\u00e1c ch\u1ec9 ti\u00eau c\u1ee7a m\u1ed7i c\u00f4ng th\u1ee9c.<\/p>\n

B\u1ea3ng 1: T\u00ednh ch\u1ea5t l\u00fd-ho\u00e1 c\u1ee7a \u0111\u1ea5t th\u00ed nghi\u1ec7m<\/strong><\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Th\u00e0nh ph\u1ea7n c\u01a1 gi\u1edbi<\/strong><\/td>\n<\/tr>\n
C\u00e1t (%)<\/td>\n75.7<\/td>\n<\/tr>\n
Th\u1ecbt (%)<\/td>\n18.2<\/td>\n<\/tr>\n
S\u00e9t (%)<\/td>\n6.1<\/td>\n<\/tr>\n
\n

Th\u00e0nh ph\u1ea7n ho\u00e1 h\u1ecdc<\/strong><\/h4>\n<\/td>\n<\/tr>\n

pH (KCl)<\/td>\n6.33<\/td>\n<\/tr>\n
M\u00f9n (%)<\/td>\n0.67<\/td>\n<\/tr>\n
\u0110\u1ea1m t\u1ed5ng s\u1ed1 (%)<\/td>\n0.2<\/td>\n<\/tr>\n
L\u00e2n d\u1ec5 ti\u00eau (mg\/100g)<\/td>\n39.04<\/td>\n<\/tr>\n
Kali d\u1ec5 ti\u00eau (mg\/100g)<\/td>\n4.22<\/td>\n<\/tr>\n
Mg trao \u0111\u1ed5i (meq %)<\/td>\n0.81<\/td>\n<\/tr>\n
Ca (meq %)<\/td>\n7.81<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

K\u1ebft qu\u1ea3<\/h3>\n

1. <\/em><\/strong>Sinh tr\u01b0\u1edfng c\u1ee7a V\u1ea1ng tr\u1ee9ng<\/em><\/strong><\/p>\n

C\u00e1c ch\u1ec9 ti\u00eau sinh tr\u01b0\u1edfng c\u1ee7a V\u1ea1ng tr\u1ee9ng sau 6 th\u00e1ng th\u00ed nghi\u1ec7m \u0111\u01b0\u1ee3c tr\u00ecnh b\u00e0y trong b\u1ea3ng 2. K\u1ebft qu\u1ea3 cho th\u1ea5y r\u1eb1ng sau 6 th\u00e1ng th\u00ed nghi\u1ec7m, kh\u00f4ng c\u00f3 s\u1ef1 sai kh\u00e1c r\u00f5 r\u1ec7t gi\u1eefa c\u00e1c c\u00f4ng th\u1ee9c cho s\u1ed1 l\u00e1 v\u00e0 di\u1ec7n t\u00edch l\u00e1. Tuy nhi\u00ean, di\u1ec7n t\u00edch l\u00e1 \u0111\u1ea1t cao nh\u1ea5t t\u1ea1i ch\u1ebf \u0111\u1ed9 che s\u00e1ng 20% (134.2 cm2<\/sup>). \u0110\u1ed1i v\u1edbi \u0111\u01b0\u1eddng k\u00ednh, s\u1ef1 sai kh\u00e1c nhau r\u00f5 r\u1ec7t gi\u1eefa c\u00e1c c\u00f4ng th\u1ee9c che s\u00e1ng: T\u1ea1i ch\u1ebf \u0111\u1ed9 che s\u00e1ng 20% v\u00e0 kh\u00f4ng che, \u0111\u01b0\u1eddng k\u00ednh c\u1ed5 r\u1ec5 l\u00e0 0,43cm v\u00e0 0.44 cm so v\u1edbi 0,37cm v\u00e0 0,38 cm \u1edf ch\u1ebf \u0111\u1ed9 che 50% v\u00e0 80% (P< 0.01). Tuy nhi\u00ean kh\u00f4ng c\u00f3 s\u1ef1 sai kh\u00e1c r\u00f5 r\u1ec7t gi\u1eefa c\u00e1c c\u00f4ng th\u1ee9c che s\u00e1ng 80% v\u1edbi 50%, c\u0169ng nh\u01b0 20% v\u1edbi kh\u00f4ng che. V\u1edbi c\u00f4ng th\u1ee9c che s\u00e1ng 20%, chi\u1ec1u cao b\u00ecnh qu\u00e2n \u0111\u1ea1t cao nh\u1ea5t (18.18cm) so v\u1edbi c\u00e1c c\u00f4ng th\u1ee9c c\u00f2n l\u1ea1i v\u00e0 s\u1ef1 sai kh\u00e1c c\u00f3 \u00fd ngh\u0129a v\u1edbi P <0.01.<\/p>\n

B\u1ea3ng 2: Sinh tr\u01b0\u1edfng c\u1ee7a c\u00e2y con V\u1ea1ng tr\u1ee9ng sau 6 th\u00e1ng<\/strong><\/p>\n\n\n\n\n\n\n\n
M\u1ee9c \u0111\u1ed9 che s\u00e1ng (%)<\/strong><\/td>\nS\u1ed1 l\u00e1<\/strong><\/td>\nDi\u1ec7n t\u00edch l\u00e1 (cm2<\/sup>)<\/strong><\/td>\n\u0110\u01b0\u1eddng k\u00ednh c\u1ed5 r\u1ec5 (cm)<\/strong><\/td>\nChi\u1ec1u cao (cm)<\/strong><\/td>\n<\/tr>\n
80<\/td>\n6,06a<\/sup><\/td>\n103.04a<\/sup><\/td>\n0,38a<\/sup><\/td>\n14,40a<\/sup><\/td>\n<\/tr>\n
50<\/td>\n5.86a<\/sup><\/td>\n121.50a<\/sup><\/td>\n0.37a<\/sup><\/td>\n15,51a<\/sup><\/td>\n<\/tr>\n
20<\/td>\n6.20a<\/sup><\/td>\n134.30a<\/sup><\/td>\n0.43b<\/sup><\/td>\n18,18b<\/sup><\/td>\n<\/tr>\n
0<\/td>\n6.10a<\/sup><\/td>\n118.40a<\/sup><\/td>\n0.44b<\/sup><\/td>\n14,90a<\/sup><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Ghi ch\u00fa: a;b l\u00e0 c\u00e1c ch\u1eef c\u00e1i kh\u00e1c nhau trong c\u00f9ng m\u1ed9t c\u1ed9t bi\u1ec3u th\u1ecb s\u1ef1 kh\u00e1c nhau c\u00f3 \u00fd ngh\u0129a c\u1ee7a c\u00e1c gi\u00e1 tr\u1ecb sinh tr\u01b0\u1edfng trung b\u00ecnh gi\u1eefa c\u00e1c c\u00f4ng th\u1ee9c che s\u00e1ng.<\/em><\/p>\n

2. <\/em><\/strong>Sinh kh\u1ed1i kh\u00f4 c\u1ee7a V\u1ea1ng tr\u1ee9ng sau 6 th\u00e1ng th\u00ed nghi\u1ec7m.<\/em><\/strong><\/p>\n

B\u1ea3ng 3: Sinh kh\u1ed1i kh\u00f4 c\u1ee7a V\u1ea1ng tr\u1ee9ng sau 6 th\u00e1ng th\u00ed nghi\u1ec7m<\/em><\/h2>\n\n\n\n\n\n\n\n
M\u1ee9c \u0111\u1ed9 che s\u00e1ng (%)<\/strong><\/td>\nTr\u1ecdng l\u01b0\u1ee3ng l\u00e1 (g)<\/strong><\/td>\nTr\u1ecdng l\u01b0\u1ee3ng th\u00e2n (g)<\/strong><\/td>\nTr\u1ecdng l\u01b0\u1ee3ng r\u1ec5 (g)<\/strong><\/td>\nT\u1ed5ng tr\u1ecdng l\u01b0\u1ee3ng kh\u00f4 (g)<\/strong><\/td>\n<\/tr>\n
80<\/td>\n0.456a<\/sup><\/td>\n0.394a<\/sup><\/td>\n0.484a<\/sup><\/td>\n1.334a<\/sup><\/td>\n<\/tr>\n
50<\/td>\n0.474a<\/sup><\/td>\n0.354a<\/sup><\/td>\n0.506ab<\/sup><\/td>\n1.334a<\/sup><\/td>\n<\/tr>\n
20<\/td>\n0.560a<\/sup><\/td>\n0.490a<\/sup><\/td>\n0.650bc<\/sup><\/td>\n1.700b<\/sup><\/td>\n<\/tr>\n
0<\/td>\n0.418a<\/sup><\/td>\n0.484a<\/sup><\/td>\n0.720c<\/sup><\/td>\n1.630ab<\/sup><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Ghi ch\u00fa: a;b;c l\u00e0 c\u00e1c ch\u1eef c\u00e1i kh\u00e1c nhau trong c\u00f9ng m\u1ed9t c\u1ed9t bi\u1ec3u th\u1ecb s\u1ef1 kh\u00e1c nhau c\u00f3 \u00fd ngh\u0129a c\u1ee7a c\u00e1c gi\u00e1 tr\u1ecb sinh tr\u01b0\u1edfng trung b\u00ecnh gi\u1eefa c\u00e1c c\u00f4ng th\u1ee9c che s\u00e1ng.<\/em><\/p>\n

K\u1ebft qu\u1ea3 t\u1eeb b\u1ea3ng 3 cho th\u1ea5y, m\u1eb7c d\u00f9 tr\u1ecdng l\u01b0\u1ee3ng kh\u00f4 c\u1ee7a th\u00e2n v\u00e0 l\u00e1 \u0111\u1ea1t cao nh\u1ea5t (0.56 gm v\u00e0 0.49 gm, t\u01b0\u01a1ng \u1ee9ng) t\u1ea1i c\u00f4ng th\u1ee9c ches\u00e1ng 20%, nh\u01b0ng s\u1ef1 sai kh\u00e1c n\u00e0ykh\u00f4ng c\u00f3 \u00fd ngh\u0129a (P>0.05). Ng\u01b0\u1ee3c l\u1ea1i, tr\u1ecdng l\u01b0\u1ee3ng kh\u00f4 c\u1ee7a r\u1ec5 l\u1ea1i kh\u00e1c nhau c\u00f3 \u00fd ngh\u0129a v\u1edbi k\u1ebft qu\u1ea3 cao nh\u1ea5t \u1edf c\u00f4ng th\u1ee9c kh\u00f4ng che s\u00e1ng (P<0.05). T\u1ed5ng tr\u1ecdng l\u01b0\u1ee3ng kh\u00f4 c\u1ee7a c\u00e2y con trong giai \u0111o\u1ea1n n\u00e0y \u0111\u1ea1t cao nh\u1ea5t t\u1ea1i ch\u1ebf \u0111\u1ed9 che s\u00e1ng 20% (1.7 gam). S\u1ef1 sai kh\u00e1c n\u00e0y kh\u00f4ng r\u00f5 r\u1ec7t so v\u1edbi t\u1ed5ng tr\u1ecdng l\u01b0\u1ee3ng kh\u00f4 t\u1ea1i c\u00f4ng th\u1ee9c kh\u00f4ng che, nh\u01b0ng kh\u00e1c nhau r\u00f5 r\u1ec7t v\u1edbi c\u00e1c c\u00f4ng th\u1ee9c \u1edf ch\u1ebf \u0111\u1ed9 che s\u00e1ng 50% v\u00e0 80% (P<0.05).<\/p>\n

K\u1ebft lu\u1eadn<\/h3>\n

Theo k\u1ebft qu\u1ea3 tr\u00ean, c\u00e2y con V\u1ea1ng tr\u1ee9ng c\u1ea7n \u0111\u01b0\u1ee3c che s\u00e1ng trong giai \u0111o\u1ea1n v\u01b0\u1eddn \u01b0\u01a1m. Tr\u00ean c\u01a1 s\u1edf c\u1ee7a th\u00ed nghi\u1ec7m, l\u1ea7n n\u1eefa kh\u1eb3ng \u0111\u1ecbnh che s\u00e1ng \u1edf m\u1ee9c \u0111\u1ed9 th\u00edch h\u1ee3p s\u1ebd gi\u00fap sinh tr\u01b0\u1edfng c\u1ee7a V\u1ea1ng tr\u1ee9ng t\u1ed1t h\u01a1n. Chi\u1ec1u cao v\u00e0 t\u1ed5ng tr\u1ecdng l\u01b0\u1ee3ng kh\u00f4 c\u1ee7a c\u00e2y con \u0111\u1ea1t cao nh\u1ea5t t\u1ea1i m\u1ee9c che 20% c\u01b0\u1eddng \u0111\u1ed9 \u00e1nh s\u00e1ng.<\/p>\n

T\u00e0i li\u1ec7u tham kh\u1ea3o<\/h1>\n

C\u00f4ng ty gi\u1ed1ng v\u00e0 ph\u1ee5c v\u1ee5 tr\u1ed3ng r\u1eebng 1995. V\u1ea1ng tr\u1ee9ng. S\u1ed5 tay k\u1ef9 thu\u1eadt h\u1ea1t gi\u1ed1ng v\u00e0 gieo \u01b0\u01a1m m\u1ed9t s\u1ed1 lo\u00e0i c\u00e2y tr\u1ed3ng r\u1eebng. Nh\u00e0 xu\u1ea5t b\u1ea3n N\u00f4ngnghi\u1ec7p H\u00e0 N\u1ed9i1995. 228-233<\/p>\n

L\u00e2m C\u00f4ng \u0110\u1ecbnh. 1964. \u0110\u1ed9 chi\u1ebfu s\u00e1ng \u0111\u1ed1i v\u1edbi sinh tr\u01b0\u1edfng c\u1ee7a m\u1ee1 con. T\u1eadp san L\u00e2m nghi\u1ec7p s\u1ed1 12-1964: 22-26.<\/p>\n

Nguy\u1ec5n B\u00e1 Ch\u1ea5t. 2001. V\u1ea1ng Tr\u1ee9ng- Lo\u00e0i c\u00e2y m\u1ecdc nhanh c\u1ea7n ph\u00e1t tri\u1ec3n. T\u1ea1p ch\u00ed N\u00f4ng nghi\u1ec7p v\u00e0 Ph\u00e1t tri\u1ec3n N\u00f4ng th\u00f4n. S\u1ed1 12- 2001: 900-903.<\/p>\n

Nguy\u1ec5n H\u1eefu Th\u01b0\u1edbc, Nguy\u1ec5n Li\u00ean v\u00e0 \u0110\u1eb7ng Xu\u00e2n Kh\u01b0\u01a1ng. 1966. S\u01a1 b\u1ed9 nghi\u00ean c\u1ee9u y\u00eau c\u1ea7u \u00e1nh s\u00e1ng c\u1ee7a c\u00e2y lim d\u01b0\u1edbi m\u1ed9t tu\u1ed5i. T\u1eadp san SV\u0110H V.I. 47-51<\/p>\n

Nguy\u1ec5n Ng\u1ecdc T\u00e2n 1989. \u1ea3nhh\u01b0\u1edfng c\u1ee7a ch\u1ebf \u0111\u1ed9 \u00e1nh s\u00e1ng, n\u01b0\u1edbc v\u00e0 b\u00f3n ph\u00e2n \u0111\u1ed1i v\u1edbi c\u00e2y H\u1ed3i (Illicium verum<\/em>Hook) \u1edf giai \u0111o\u1ea1n v\u01b0\u1eddn \u01b0\u01a1m. M\u1ed9t s\u1ed1 k\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u Khoa h\u1ecdc K\u1ef9 thu\u1eadt L\u00e2m nghi\u1ec7p 1976 \u2013 1985. Nh\u00e0 xu\u1ea5t b\u1ea3n N\u00f4ng nghi\u1ec7p 1989: 243-262<\/p>\n

Sasaki, S., v\u00e0 Mori. T 1981. Growth responses of Dipterocar seedlings to light. Malaysia forester 44: 319- 345<\/p>\n

Summary: <\/strong>After pointing out the important role of light in the growth and development of planted trees the paper briefly reviews on this matter. Hence the paper gives reasons for needed research on effect of light on growth of Endospermusn chinese seedlings together with research method and the results obtained. Conclusion is made that height, total dry weight of the seedling is greatest with 20% reduction of light intensity.<\/p>\n","protected":false},"excerpt":{"rendered":"

ánhsáng là m\u1ed9t trong nh\u1eefng nhân t\u1ed1 sinh t\u1ed3n \u0111\u1ed1i v\u1edbi sinh tr\u01b0\u1edfng và phát tri\u1ec3n c\u1ee7a th\u1ef1c v\u1eadt. ánhsáng không nh\u1eefng có tác d\u1ee5ng tr\u1ef1c ti\u1ebfp \u0111\u1ebfn quang h\u1ee3p mà còn có tác d\u1ee5ng \u0111\u1ebfn quá trình thoát h\u01a1i n\u01b0\u1edbc, quá trình hô h\u1ea5p. Vì th\u1ebf,ánh sáng có \u1ea3nh h\u01b0\u1edfng nhi\u1ec1u m\u1eb7t \u0111\u1ebfn toàn b\u1ed9 \u0111\u1eddi s\u1ed1ng c\u1ee7a th\u1ef1c v\u1eadt t\u1eeb khi h\u1ea1t n\u1ea3y m\u1ea7m, cây ra hoa k\u1ebft qu\u1ea3cho \u0111\u1ebfn khi ch\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\/8613"}],"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=8613"}],"version-history":[{"count":2,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/posts\/8613\/revisions"}],"predecessor-version":[{"id":19288,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/posts\/8613\/revisions\/19288"}],"wp:attachment":[{"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/media?parent=8613"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/categories?post=8613"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/tags?post=8613"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}