{"id":474,"date":"2005-07-16T05:31:54","date_gmt":"2005-07-16T05:31:54","guid":{"rendered":"http:\/\/vafs.dungnq.local\/2005\/07\/16\/nghien-cuu-kha-nang-cai-thien-tieu-khi-hau-cua-so-camellia-sasanqua-thunb-tren-vung-dat-cat-ven-bien-binh-tri-thien-2\/"},"modified":"2013-10-07T11:23:47","modified_gmt":"2013-10-07T04:23:47","slug":"nghien-cuu-kha-nang-cai-thien-tieu-khi-hau-cua-so-camellia-sasanqua-thunb-tren-vung-dat-cat-ven-bien-binh-tri-thien-2","status":"publish","type":"post","link":"https:\/\/vafs.gov.vn\/vn\/nghien-cuu-kha-nang-cai-thien-tieu-khi-hau-cua-so-camellia-sasanqua-thunb-tren-vung-dat-cat-ven-bien-binh-tri-thien-2\/","title":{"rendered":"Nghi\u00ean c\u1ee9u kh\u1ea3 n\u0103ng c\u1ea3i thi\u1ec7n ti\u1ec3u kh\u00ed h\u1eadu c\u1ee7a S\u1edf (Camellia sasanqua Thunb.) tr\u00ean v\u00f9ng \u0111\u1ea5t c\u00e1t ven bi\u1ec3n B\u00ecnh \u2013Tr\u1ecb \u2013Thi\u00ean."},"content":{"rendered":"

\u0110\u1eb7ng Th\u00e1i D\u01b0\u01a1ng<\/i><\/b><\/p>\n

Tr\u01b0\u1eddng \u0110\u1ea1i h\u1ecdc N\u00f4ng L\u00e2m Hu\u1ebf.<\/i><\/p>\n

 <\/p>\n

Ba t\u1ec9nh Qu\u1ea3ng B\u00ecnh, Qu\u1ea3ng Tr\u1ecb, Th\u1eeba Thi\u00ean Hu\u1ebf g\u1ecdi t\u1eaft l\u00e0 B\u00ecnh – Tr\u1ecb – Thi\u00ean c\u00f3 81.408,8 ha \u0111\u1ea5t c\u00e1t ven bi\u1ec3n, chi\u1ebfm 5,45% t\u1ed5ng di\u1ec7n t\u00edch t\u1ef1 nhi\u00ean. V\u00f9ng \u0111\u1ea5t c\u00e1t ven bi\u1ec3n B\u00ecnh -Tr\u1ecb -Thi\u00ean c\u00f3 v\u1ecb tr\u00ed chi\u1ebfn l\u01b0\u1ee3c quan tr\u1ecdng trong ph\u00e1t tri\u1ec3n kinh t\u1ebf – x\u00e3 h\u1ed9i v\u00e0 m\u00f4i tr\u01b0\u1eddng c\u1ee7a khu v\u1ef1c. \u0110\u00e2y c\u00f3 th\u1ec3 n\u00f3i l\u00e0 v\u00f9ng \u0111\u1ea5t r\u1ea5t kh\u00f3 kh\u0103n trong s\u1eed d\u1ee5ng v\u00ec \u0111i\u1ec1u ki\u1ec7n t\u1ef1 nhi\u00ean r\u1ea5t kh\u1eafc nghi\u1ec7t, \u0111\u1ea5t \u0111ai ngh\u00e8o dinh d\u01b0\u1ee1ng v\u00e0 th\u01b0\u1eddng xuy\u00ean ch\u1ecbu t\u00e1c \u0111\u1ed9ng c\u1ee7a gi\u00f3 b\u00e3o bi\u1ec3n. \u0110\u1ec3 c\u1ea3i t\u1ea1o v\u00e0 s\u1eed d\u1ee5ng c\u00f3 hi\u1ec7u qu\u1ea3 v\u00f9ng \u0111\u1ea5t n\u00e0y vi\u1ec7c nghi\u00ean c\u1ee9u v\u00e0 g\u00e2y tr\u1ed3ng r\u1eebng ph\u00f2ng h\u1ed9 \u0111\u00f3ng vai tr\u00f2 h\u1ebft s\u1ee9c quan tr\u1ecdng.<\/p>\n

S\u1edf l\u00e0 lo\u00e0i c\u00e2y \u0111a m\u1ee5c \u0111\u00edch ngo\u00e0i vi\u1ec7c cung c\u1ea5p h\u1ea1t \u00e9p d\u1ea7u \u0103n S\u1edf c\u00f2n c\u00f3 kh\u1ea3 n\u0103ng ph\u00f2ng h\u1ed9 t\u1ed1t c\u1ea3 tr\u00ean \u0111\u1ea5t \u0111\u1ed3i n\u00fai v\u00e0 tr\u00ean \u0111\u1ea5t c\u00e1t ven bi\u1ec3n. Nghi\u00ean c\u1ee9u v\u1ec1 kh\u1ea3 n\u0103ng ph\u00f2ng h\u1ed9 c\u1ee7a S\u1edf n\u00f3i ri\u00eang v\u00e0 c\u1ee7a c\u00e1c lo\u00e0i c\u00e2y tr\u1ed3ng kh\u00e1c n\u00f3i chung \u1edf n\u01b0\u1edbc ta c\u00f2n r\u1ea5t \u00edt, \u0111\u1eb7c bi\u1ec7t l\u00e0 tr\u00ean v\u00f9ng \u0111\u1ea5t c\u00e1t ven bi\u1ec3n. Nh\u1eb1m cung c\u1ea5p cho b\u1ea1n \u0111\u1ecdc nh\u1eefng th\u00f4ng tin v\u1ec1 v\u1ea5n \u0111\u1ec1 n\u00e0y ch\u00fang t\u00f4i tr\u00edch \u0111\u0103ng m\u1ed9t s\u1ed1 k\u1ebft qu\u1ea3 b\u01b0\u1edbc \u0111\u1ea7u v\u1ec1 kh\u1ea3 n\u0103ng c\u1ea3i thi\u1ec7n ti\u1ec3u kh\u00ed h\u1eadu c\u1ee7a S\u1edf tr\u00ean v\u00f9ng \u0111\u1ea5t c\u00e1t ven bi\u1ec3n B\u00ecnh-Tr\u1ecb \u2013Thi\u00ean \u0111\u01b0\u1ee3c r\u00fat ra t\u1eeb k\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u nhi\u1ec1u n\u0103m v\u1ec1 c\u00e2y S\u1edf.<\/p>\n

 <\/p>\n

1. \u0110\u1ed1i t\u01b0\u1ee3ng- n\u1ed9i dung v\u00e0 ph\u01b0\u01a1ng ph\u00e1p nghi\u00ean c\u1ee9u<\/b><\/p>\n

1.1. \u0110\u1ed1i t\u01b0\u1ee3ng nghi\u00ean c\u1ee9u<\/i><\/b><\/p>\n

i) R\u00fa c\u00e1t m\u1ecdc t\u1ef1 nhi\u00ean c\u00f3 k\u1ebft c\u1ea5u th\u01b0a, h\u01a1i k\u00edn v\u00e0 k\u00edn tr\u00ean v\u00f9ng \u0111\u1ea5t c\u00e1t tr\u1eafng x\u00e1m t\u1ec9nh Th\u1eeba Thi\u00ean Hu\u1ebf v\u00e0 t\u1ec9nh Qu\u1ea3ng B\u00ecnh.<\/i><\/p>\n

– \u0110\u1ed9 t\u00e1n che c\u1ee7a r\u00fa k\u1ebft c\u1ea5u th\u01b0a kho\u1ea3ng 30% v\u1edbi h\u1ec7 s\u1ed1 l\u1ecdt gi\u00f3 0,58; r\u00fa h\u01a1i k\u00edn 50%, h\u1ec7 s\u1ed1 l\u1ecdt gi\u00f3 0,48 v\u00e0 r\u00fa k\u00edn kho\u1ea3ng 75%, h\u1ec7 s\u1ed1 l\u1ecdt gi\u00f3 0,25.<\/p>\n

-T\u1ed5 th\u00e0nh lo\u00e0i: T\u1ed5 th\u00e0nh trong r\u00fa c\u00e1t r\u1ea5t \u0111a d\u1ea1ng v\u00e0 phong ph\u00fa v\u1ec1 th\u00e0nh ph\u1ea7n lo\u00e0i. K\u1ebft qu\u1ea3 \u0111i\u1ec1u tra trong c\u00e1c \u00f4 ti\u00eau chu\u1ea9n 2500m2<\/sup> cho th\u1ea5y c\u00f3 37 lo\u00e0i nh\u01b0: D\u1ebb cau, D\u1ebb Gai, S\u1edf, Tr\u00e2m B\u1ea7u, M\u00e0 ca, M\u1eb7t c\u1eaft, R\u1ecfi, L\u1ee5c, Ch\u00e0 \u0110am, Tr\u00e8n Tr\u00e8n, D\u1ea7u \u0111\u1eafng, D\u1ea7u de, X\u0103ng m\u00e3, B\u00e1ch b\u1ec7nh, Tr\u00e0m, C\u1ed5 \u01b0\u1edbm, Sim, Mua, Trang, D\u00e1i De, M\u00f3c, D\u00f3 ni\u1ec7t, B\u1eddi l\u1eddi nh\u1edbt… K\u1ebft h\u1ee3p gi\u1eefa quan \u0111i\u1ec3m c\u1ee7a Daniel Marmilod v\u00e0 Th\u00e1i V\u0103n Tr\u1eebng \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh t\u1ed5 th\u00e0nh nh\u00f3m lo\u00e0i c\u00e2y \u01b0u th\u1ebf c\u1ee7a r\u00fa c\u00e1t cho th\u1ea5y tr\u1ecb s\u1ed1 IV c\u1ee7a S\u1edf t\u1eeb 7,22-20,9%.<\/p>\n

– Chi\u1ec1u cao, r\u1ed9ng v\u00e0 t\u1ea7ng t\u00e1n r\u1eebng: Chi\u1ec1u r\u1ed9ng c\u1ee7a \u0111ai r\u00fa t\u1ea1i v\u1ecb tr\u00ed \u0111o kho\u1ea3ng 60-70m. Chi\u1ec1u d\u00e0i c\u1ee7a \u0111ai kho\u1ea3ng 700-1000m. Chi\u1ec1u cao \u0111ai l\u00e0 5- 5,15m. \u0110\u01b0\u1eddng k\u00ednh t\u00e1n b\u00ecnh qu\u00e2n l\u00e0 2,34-2,56m. T\u1ea7ng c\u00e2y b\u1ee5i v\u00e0 c\u00e2y t\u00e1i sinh c\u00f3 chi\u1ec1u cao t\u1eeb 0,5-2m nh\u01b0ng chi\u1ec1u cao c\u1ee7a c\u00e1c c\u00e2y ch\u1ee7 y\u1ebfu t\u1eadp trung kho\u1ea3ng 1-1,5m.<\/p>\n

ii) R\u1eebng S\u1edf tr\u1ed3ng tr\u00ean \u0111\u1ea5t c\u00e1t v\u00e0ng t\u1ec9nh Qu\u1ea3ng Tr\u1ecb.<\/i><\/p>\n

-Ph\u01b0\u01a1ng th\u1ee9c tr\u1ed3ng: Tr\u1ed3ng r\u1eebng d\u01b0\u1edbi t\u00e1n r\u00fa th\u01b0a. Trong qu\u00e1 tr\u00ecnh ch\u0103m s\u00f3c, t\u1ec9a th\u01b0a d\u1ea7n c\u00e2y t\u1ef1 nhi\u00ean, m\u1edf t\u00e1n cho S\u1edf.<\/p>\n

-K\u1ef9 thu\u1eadt tr\u1ed3ng: Tr\u1ed3ng r\u1eebng b\u1eb1ng c\u00e2y con r\u1ec5 tr\u1ea7n. Trong qu\u00e1 tr\u00ecnh ch\u0103m s\u00f3c tr\u1ed3ng d\u1eb7m \u0111\u1ec3 t\u0103ng m\u1eadt \u0111\u1ed9 v\u00e0 t\u1ed5 th\u00e0nh lo\u00e0i c\u00e2y s\u1edf.<\/p>\n

– Sinh tr\u01b0\u1edfng v\u00e0 k\u1ebft c\u1ea5u c\u1ee7a \u0111ai r\u1eebng: D\u1ef1a theo ti\u00eau chu\u1ea9n ph\u00e2n lo\u1ea1i c\u1ee7a B\u00f4\u0111r\u00f4p, r\u1eebng S\u1edf V\u0129nh Ch\u1ea5p c\u00f3 k\u1ebft c\u1ea5u h\u01a1i k\u00edn v\u1edbi h\u1ec7 s\u1ed1 l\u1ecdt gi\u00f3 l\u00e0 0,42. Sinh tr\u01b0\u1edfng chi\u1ec1u cao b\u00ecnh qu\u00e2n c\u1ee7a r\u1eebng l\u00e0 5,2m. Chi\u1ec1u cao c\u1ee7a nh\u1eefng c\u00e2y cao nh\u1ea5t t\u1eeb 7,5- 8m, c\u00e2y c\u00f3 chi\u1ec1u cao th\u1ea5p nh\u1ea5t kho\u1ea3ng 4m. Chi\u1ec1u cao d\u01b0\u1edbi c\u00e0nh bi\u1ebfn \u0111\u1ed9ng t\u1eeb 1,5- 2m. \u0110\u01b0\u1eddng k\u00ednh t\u00e1n b\u00ecnh qu\u00e2n 4,39 m. \u0110\u01b0\u1eddng k\u00ednh t\u00e1n bi\u1ebfn \u0111\u1ed9ng t\u1eeb 2,25 -7,2m. Chi\u1ec1u r\u1ed9ng c\u1ee7a \u0111ai t\u1ea1i \u0111\u1ecba \u0111i\u1ec3m \u0111o gi\u00f3 kho\u1ea3ng 60m.<\/p>\n

– T\u1ed5 th\u00e0nh, m\u1eadt \u0111\u1ed9, m\u1ea1ng h\u00ecnh ph\u00e2n b\u1ed1 v\u00e0 \u0111\u1ed9 t\u00e1n che c\u1ee7a r\u1eebng: T\u1ed5 th\u00e0nh lo\u00e0i c\u00e2y trong r\u1eebng tr\u1ed3ng \u0111\u01a1n gi\u1ea3n. Lo\u00e0i ch\u1ee7 y\u1ebfu l\u00e0 lo\u00e0i c\u00e2y S\u1edf v\u1edbi t\u1ed5 th\u00e0nh IV= 75,84% v\u00e0 D\u1ebb gai 13,40%. C\u00e1c lo\u00e0i kh\u00e1c nh\u01b0 D\u1ebb cau, Tr\u00e2m b\u1ea7u… chi\u1ebfm t\u1ef7 l\u1ec7 nh\u1ecf. M\u1eadt \u0111\u1ed9 hi\u1ec7n c\u00f2n c\u1ee7a c\u00e1c lo\u00e0i l\u00e0 568 c\u00e2y\/ha. Trong \u0111\u00f3 m\u1eadt \u0111\u1ed9 c\u1ee7a S\u1edf l\u00e0 464 c\u00e2y\/ha, D\u1ebb gai l\u00e0 44 c\u00e2y\/ha, c\u00e1c lo\u00e0i kh\u00e1c c\u00f3 m\u1eadt \u0111\u1ed9 l\u00e0 60 c\u00e2y\/ha. \u0110\u1ed9 t\u00e1n che kho\u1ea3ng 55-65%.<\/p>\n

 <\/p>\n

2.2. N\u1ed9i dung v\u00e0 ph\u01b0\u01a1ng ph\u00e1p<\/i><\/b><\/p>\n

i. Kh\u1ea3 n\u0103ng ch\u1eafn gi\u00f3.<\/i><\/p>\n

\u0110o gi\u00f3 ph\u00eda tr\u01b0\u1edbc \u0111ai r\u1eebng b\u1eb1ng m\u00e1y \u0111o gi\u00f3 c\u1ea7m tay v\u00e0 \u0111\u1ecba b\u00e0n \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh h\u01b0\u1edbng gi\u00f3, m\u00e1y \u0111\u1eb7t \u1edf h\u01b0\u1edbng T\u00e2y- Nam, \u1edf v\u1ecb tr\u00ed h\u01b0\u1edbng gi\u00f3 vu\u00f4ng g\u00f3c v\u1edbi h\u01b0\u1edbng c\u1ee7a \u0111ai r\u1eebng, c\u00e1ch \u0111ai r\u1eebng 12 H v\u00e0 \u1edf \u0111\u1ed9 cao 1m, 1,5m, 3m. Sau \u0111ai \u0111o \u1edf c\u00e1c v\u1ecb tr\u00ed c\u00e1ch \u0111ai 1m v\u1edbi \u0111\u1ed9 cao 1m, 1,5m, 3m v\u00e0 c\u00e1ch \u0111ai 20m, 40m, 60m, 80m,100m v\u1edbi \u0111\u1ed9 cao 1,5m. M\u1ed7i \u0111i\u1ec3m \u0111o l\u1eb7p l\u1ea1i 3 l\u1ea7n l\u1ea5y gi\u00e1 tr\u1ecb trung b\u00ecnh.<\/p>\n

ii. Nhi\u1ec7t \u0111\u1ed9, \u1ea9m \u0111\u1ed9.<\/i><\/p>\n

<\/b>\u0110o v\u00e0o c\u00e1c ng\u00e0y n\u1eafng trong th\u00e1ng 7 n\u0103m 2002. th\u1eddi gian trong ng\u00e0y \u0111\u01b0\u1ee3c b\u1ed1 tr\u00ed \u0111o v\u00e0o c\u00e1c th\u1eddi \u0111i\u1ec3m 10h, 13h, 16h.<\/p>\n

Nhi\u1ec7t \u0111\u1ed9 kh\u00f4ng kh\u00ed: D\u00f9ng nhi\u1ec7t k\u1ebf \u0111\u1ed3ng h\u1ed3 ti\u1ebfn h\u00e0nh \u0111o \u1edf hai v\u1ecb tr\u00ed trong r\u1eebng v\u00e0 ngo\u00e0i \u0111\u1ea5t tr\u1ed1ng, \u0111o \u1edf \u0111\u1ed9 cao 1,5m so v\u1edbi m\u1eb7t \u0111\u1ea5t.<\/p>\n

\u1ea9m \u0111\u1ed9 kh\u00f4ng kh\u00ed: D\u00f9ng \u1ea9m k\u1ebf t\u00f3c ti\u1ebfn h\u00e0nh \u0111o \u1edf hai v\u1ecb tr\u00ed trong v\u00e0 ngo\u00e0i r\u1eebng, \u0111o \u1edf \u0111\u1ed9 cao 1,5m so v\u1edbi m\u1eb7t \u0111\u1ea5t.<\/p>\n

iii.B\u1ee9c x\u1ea1.<\/i><\/p>\n

<\/i>D\u00f9ng lux k\u1ebf ti\u1ebfn h\u00e0nh \u0111o \u1edf c\u00e1c v\u1ecb tr\u00ed trong v\u00e0 ngo\u00e0i r\u1eebng th\u1eddi \u0111i\u1ec3m \u0111o v\u00e0o 10 gi\u1edd, 13 gi\u1edd v\u00e0 16 gi\u1edd.<\/p>\n

 <\/p>\n

* X\u1ee9 l\u00fd s\u1ed1 li\u1ec7u.<\/p>\n

+ Hi\u1ec7u n\u0103ng ph\u00f2ng h\u1ed9: L\u00e0 t\u1ed1c \u0111\u1ed9 gi\u00f3 gi\u1ea3m t\u00ednh theo ph\u1ea7n tr\u0103m.<\/p>\n\n\n\n\n
\n
E =<\/span><\/h6>\n<\/td>\n
\nV0<\/sub> – V<\/td>\n\n. 100<\/td>\n<\/tr>\n
\nV0<\/sub><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

<\/b>Trong \u0111\u00f3: E: Hi\u1ec7u n\u0103ng ph\u00f2ng h\u1ed9 (%); V0<\/sub>: T\u1ed1c \u0111\u1ed9 gi\u00f3 trung b\u00ecnh \u0111i\u1ec3m l\u1ea5y \u1edf v\u1ecb tr\u00ed c\u00e1ch 12H tr\u01b0\u1edbc \u0111ai; V: T\u1ed1c \u0111\u1ed9 gi\u00f3 trung b\u00ecnh l\u1ea5y \u1edf c\u00e1c v\u1ecb tr\u00ed kh\u00e1c sau \u0111ai.<\/p>\n

+ H\u1ec7 s\u1ed1 l\u1ecdt gi\u00f3: L\u00e0 t\u1ec9 s\u1ed1 gi\u1eefa t\u1ed1c \u0111\u1ed9 gi\u00f3 trung b\u00ecnh \u1edf c\u00e1c \u0111\u1ed9 cao kh\u00e1c nhau ph\u00eda sau \u0111ai v\u1edbi t\u1ed1c \u0111\u1ed9 gi\u00f3 trung b\u00ecnh \u1edf c\u00e1c \u0111\u1ed9 cao t\u01b0\u01a1ng \u1ee9ng ph\u00eda tr\u01b0\u1edbc \u0111ai.<\/p>\n\n\n\n\n
\nK =<\/td>\n\nU\u20191<\/sub> + U\u20192<\/sub> + … U\u2019n<\/sub><\/td>\n<\/tr>\n
\nU1<\/sub> + U2<\/sub> + … Un<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Trong \u0111\u00f3: K: H\u1ec7 s\u1ed1 l\u1ecdt gi\u00f3; U\u2019n<\/sub>: T\u1ed1c \u0111\u1ed9 gi\u00f3 \u0111o \u1edf sau \u0111ai c\u00e1ch \u0111ai r\u1eebng 1m \u1edf c\u00e1c \u0111\u1ed9 cao n; Un: T\u1ed1c \u0111\u1ed9 gi\u00f3 \u0111o \u1edf tr\u01b0\u1edbc \u0111ai c\u00e1ch \u0111ai 12H t\u1ea1i \u0111\u1ed9 cao t\u01b0\u01a1ng \u1ee9ng v\u1edbi n.<\/p>\n

+ Ph\u00e2n lo\u1ea1i k\u1ebft c\u1ea5u \u0111ai r\u1eebng: Theo B\u00f4\u0111r\u00f4p \u0111ai k\u00edn c\u00f3 h\u1ec7 s\u1ed1 l\u1ecdt gi\u00f3 K <0,3; \u0111ai h\u01a1i k\u00edn 0,3<K<0,5; \u0111ai th\u01b0a K>0,5. Ph\u01b0\u01a1ng ph\u00e1p n\u00e0y d\u1ef1a v\u00e0o h\u1ec7 s\u1ed1 l\u1ecdt gi\u00f3 l\u00e0 ch\u1ec9 ti\u00eau ph\u1ea3n \u1ea3nh t\u01b0\u01a1ng \u0111\u1ed1i ch\u00ednh x\u00e1c t\u00ednh l\u1ecdt gi\u00f3 c\u1ee7a \u0111ai r\u1eebng n\u00ean n\u00f3 l\u00e0 ph\u01b0\u01a1ng ph\u00e1p khoa h\u1ecdc v\u00e0 \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng r\u1ed9ng r\u00e3i.<\/p>\n

+ T\u1ed1c \u0111\u1ed9 gi\u00f3 c\u00f2n l\u1ea1i sau \u0111ai:<\/p>\n\n\n\n\n
\n
F =<\/span><\/h6>\n<\/td>\n
\nV<\/td>\n\n100<\/td>\n<\/tr>\n
\nV0<\/sub><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Trong \u0111\u00f3: F l\u00e0 t\u1ed1c \u0111\u1ed9 gi\u00f3 c\u00f2n l\u1ea1i sau \u0111ai (%); V0<\/sub> : t\u1ed1c \u0111\u1ed9 gi\u00f3 trung b\u00ecnh nhi\u1ec1u \u0111i\u1ec3m tr\u01b0\u1edbc \u0111ai; V: t\u1ed1c \u0111\u1ed9 gi\u00f3 trung b\u00ecnh nhi\u1ec1u \u0111i\u1ec3m sau \u0111ai<\/p>\n

 <\/p>\n

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

2.1. Ch\u1eafn gi\u00f3<\/i><\/b><\/b><\/p>\n

V\u00f9ng \u0111\u1ea5t c\u00e1t ven bi\u1ec3n B\u00ecnh – Tr\u1ecb -Thi\u00ean ch\u1ecbu s\u1ef1 t\u00e1c \u0111\u1ed9ng c\u1ee7a 2 lo\u1ea1i gi\u00f3 h\u1ea1i ch\u00ednh: Gi\u00f3 ph\u01a1n T\u00e2y Nam ho\u1ea1t \u0111\u1ed9ng t\u1eeb th\u00e1ng 4 \u0111\u1ebfn th\u00e1ng 9, m\u1ea1nh nh\u1ea5t v\u00e0o th\u00e1ng 5 \u0111\u1ebfn th\u00e1ng 7 v\u00e0 gi\u00f3 m\u00f9a \u0110\u00f4ng B\u1eafc ho\u1ea1t \u0111\u1ed9ng t\u1eeb th\u00e1ng 9 \u0111\u1ebfn th\u00e1ng 4 n\u0103m sau, m\u1ea1nh nh\u1ea5t v\u00e0o th\u00e1ng 10, 11 h\u00e0ng n\u0103m. C\u00e1c lo\u1ea1i gi\u00f3 n\u00e0y nhi\u1ec1u khi \u0111\u1ea1t t\u1edbi v\u1eadn t\u1ed1c r\u1ea5t l\u1edbn, \u0111\u1eb7c bi\u1ec7t l\u00e0 khu v\u1ef1c s\u00e1t b\u1edd bi\u1ec3n n\u00ean \u1ea3nh h\u01b0\u1edfng tr\u1ef1c ti\u1ebfp \u0111\u1ebfn c\u00e1c ho\u1ea1t \u0111\u1ed9ng s\u1ea3n xu\u1ea5t v\u00e0 \u0111\u1eddi s\u1ed1ng kinh t\u1ebf, v\u0103n ho\u00e1, x\u00e3 h\u1ed9i c\u1ee7a ng\u01b0\u1eddi d\u00e2n v\u00f9ng c\u00e1t. S\u1ed1 li\u1ec7u thu th\u1eadp v\u00e0o th\u00e1ng 7 n\u0103m 2002, h\u01b0\u1edbng gi\u00f3 T\u00e2y-Nam. Kh\u1ea3 n\u0103ng ch\u1eafn gi\u00f3 c\u1ee7a r\u1eebng S\u1edf v\u00e0 r\u00fa c\u00e1t \u0111\u01b0\u1ee3c tr\u00ecnh b\u00e0y \u1edf b\u1ea3ng 1 v\u00e0 bi\u1ec3u \u0111\u1ed3 1 cho th\u1ea5y m\u1ed9t s\u1ed1 n\u00e9t sau:<\/p>\n

– Trong c\u00f9ng m\u1ed9t lo\u1ea1i k\u1ebft c\u1ea5u c\u1ee7a \u0111ai r\u00fa c\u00e1t v\u00e0 r\u1eebng S\u1edf tr\u1ed3ng t\u1ed1c \u0111\u1ed9 gi\u00f3 \u1edf ph\u00eda sau \u0111ai r\u1eebng \u0111\u1ec1u gi\u1ea3m h\u01a1n so v\u1edbi tr\u01b0\u1edbc \u0111ai, c\u00e0ng xa \u0111ai r\u1eebng v\u1ec1 ph\u00eda khu\u1ea5t gi\u00f3 t\u1ed1c \u0111\u1ed9 gi\u00f3 t\u0103ng d\u1ea7n v\u00e0 \u0111\u1ea1t tr\u1ecb s\u1ed1 trung b\u00ecnh 80-85% so v\u1edbi t\u1ed1c \u0111\u1ed9 gi\u00f3 tr\u01b0\u1edbc \u0111ai t\u1ea1i v\u1ecb tr\u00ed c\u00e1ch \u0111ai 100 m, t\u01b0\u01a1ng \u0111\u01b0\u01a1ng v\u1edbi kho\u1ea3ng c\u00e1ch 20 l\u1ea7n chi\u1ec1u cao c\u1ee7a \u0111ai.<\/p>\n

 <\/p>\n

B\u1ea3ng 1: <\/i>\u1ea3nh<\/i>h\u01b0\u1edfng c\u1ee7a \u0111ai r\u1eebng c\u00f3 h\u1ec7 s\u1ed1 l\u1ecdt gi\u00f3 kh\u00e1c nhau \u0111\u1ebfn t\u1ed1c \u0111\u1ed9 gi\u00f3.<\/i><\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n
\n

Lo\u1ea1i r\u1eebng – \u0111\u1ecba \u0111i\u1ec3m<\/b><\/p>\n<\/td>\n

\n

V\u1ecb tr\u00ed \u0111o t\u1ed1c \u0111\u1ed9 gi\u00f3<\/b><\/p>\n<\/td>\n

\n

Vo(m\/s)<\/b><\/p>\n<\/td>\n

\n

K<\/b><\/p>\n<\/td>\n

\n

Ph\u00eda sau \u0111ai (m)<\/b><\/p>\n<\/td>\n

\n

E (%)<\/b><\/p>\n<\/td>\n<\/tr>\n

\n

20<\/b><\/p>\n<\/td>\n

\n

40<\/b><\/p>\n<\/td>\n

\n

60<\/b><\/p>\n<\/td>\n

\n

80<\/b><\/p>\n<\/td>\n

\n

100<\/b><\/p>\n<\/td>\n<\/tr>\n

\n

R\u00fa c\u00e1t th\u01b0a, Qu\u1ea3ng \u0110i\u1ec1n Th\u1eeba Thi\u00ean Hu\u1ebf<\/p>\n<\/td>\n

\n

\u1edf \u0111\u1ed9 cao 1,5m (m\/s)<\/p>\n<\/td>\n

\n

2,2<\/p>\n<\/td>\n

\n

0,58<\/p>\n<\/td>\n

\n

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

\n

1,4<\/p>\n<\/td>\n

\n

1,6<\/p>\n<\/td>\n

\n

1,8<\/p>\n<\/td>\n

\n

1,9<\/p>\n<\/td>\n

\n

29<\/p>\n<\/td>\n<\/tr>\n

\n

So v\u1edbi V0<\/sub> (%)<\/p>\n<\/td>\n

\n

100<\/p>\n<\/td>\n

\n

51<\/p>\n<\/td>\n

\n

65<\/p>\n<\/td>\n

\n

73<\/p>\n<\/td>\n

\n

82<\/p>\n<\/td>\n

\n

85<\/p>\n<\/td>\n<\/tr>\n

\n

R\u00fa c\u00e1t h\u01a1i k\u00edn, Phong \u0110i\u1ec1n- Th\u1eeba Thi\u00ean Hu\u1ebf<\/p>\n<\/td>\n

\n

\u1edf \u0111\u1ed9 cao 1,5m (m\/s)<\/p>\n<\/td>\n

\n

2,8<\/p>\n<\/td>\n

\n

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

\n

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

\n

1,7<\/p>\n<\/td>\n

\n

2,0<\/p>\n<\/td>\n

\n

2,1<\/p>\n<\/td>\n

\n

2,2<\/p>\n<\/td>\n

\n

35<\/p>\n<\/td>\n<\/tr>\n

\n

So v\u1edbi V0<\/sub> (%)<\/p>\n<\/td>\n

\n

100<\/p>\n<\/td>\n

\n

38<\/p>\n<\/td>\n

\n

62<\/p>\n<\/td>\n

\n

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

\n

76<\/p>\n<\/td>\n

\n

80<\/p>\n<\/td>\n<\/tr>\n

\n

R\u00fa c\u00e1t k\u00edn, L\u1ec7 Thu\u1ef7-Qu\u1ea3ng B\u00ecnh<\/p>\n<\/td>\n

\n

\u1edf \u0111\u1ed9 cao 1,5m (m\/s)<\/p>\n<\/td>\n

\n

3,1<\/p>\n<\/td>\n

\n

0,25<\/p>\n<\/td>\n

\n

0,9<\/p>\n<\/td>\n

\n

2,0<\/p>\n<\/td>\n

\n

2,4<\/p>\n<\/td>\n

\n

2,6<\/p>\n<\/td>\n

\n

2,9<\/p>\n<\/td>\n

\n

30<\/p>\n<\/td>\n<\/tr>\n

\n

So v\u1edbi V0<\/sub> (%)<\/p>\n<\/td>\n

\n

100<\/p>\n<\/td>\n

\n

29<\/p>\n<\/td>\n

\n

65<\/p>\n<\/td>\n

\n

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

\n

84<\/p>\n<\/td>\n

\n

92<\/p>\n<\/td>\n<\/tr>\n

\n

R\u1eebng S\u1edf tr\u1ed3ng, V\u0129nh Linh-Qu\u1ea3ng Tr\u1ecb<\/p>\n<\/td>\n

\n

\u1edf \u0111\u1ed9 cao 1,5m (m\/s)<\/p>\n<\/td>\n

\n

3,5<\/p>\n<\/td>\n

\n

0,42<\/p>\n<\/td>\n

\n

1,2<\/p>\n<\/td>\n

\n

1,9<\/p>\n<\/td>\n

\n

2,3<\/p>\n<\/td>\n

\n

2,5<\/p>\n<\/td>\n

\n

2,7<\/p>\n<\/td>\n

\n

39<\/p>\n<\/td>\n<\/tr>\n

\n

So v\u1edbi V0<\/sub> (%)<\/p>\n<\/td>\n

\n

100<\/p>\n<\/td>\n

\n

33<\/p>\n<\/td>\n

\n

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

\n

66<\/p>\n<\/td>\n

\n

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

\n

78<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

 <\/p>\n

Bi?u d? 1: T? l? t?c d? gi\u00fa sau dai so v?i tru?c dai<\/i><\/p>\n

 <\/p>\n

Nh\u01b0 v\u1eady, n\u1ebfu l\u1ea5y chi\u1ec1u cao c\u00e2y l\u00e0m chu\u1ea9n m\u1ef1c \u0111\u00e1nh gi\u00e1 c\u00f3 th\u1ec3 n\u00f3i r\u1eb1ng ph\u1ea1m vi ph\u00f2ng h\u1ed9 c\u1ee7a S\u1edf l\u00e0 kh\u00e1 l\u1edbn, tuy nhi\u00ean do lo\u00e0i S\u1edf Camellia sasanqua<\/i> sinh tr\u01b0\u1edfng tr\u00ean \u0111\u1ea5t c\u00e1t ven bi\u1ec3n B\u00ecnh Tr\u1ecb Thi\u00ean ch\u1ec9 \u0111\u1ea1t chi\u1ec1u cao trung b\u00ecnh 5m n\u00ean ph\u1ea1m vi ch\u1eafn gi\u00f3 c\u1ee7a S\u1edf k\u00e9m h\u01a1n so v\u1edbi c\u00e1c lo\u00e0i c\u00e2y kh\u00e1c c\u00f3 chi\u1ec1u cao l\u1edbn h\u01a1n nh\u01b0 Phi lao \u0111\u1ea1t t\u1edbi ph\u1ea1m vi 350-400 m.<\/p>\n

– C\u00e1c lo\u1ea1i k\u1ebft c\u1ea5u \u0111ai r\u1eebng S\u1edf kh\u00e1c nhau c\u00f3 \u1ea3nh h\u01b0\u1edfng l\u1edbn t\u1edbi kh\u1ea3 n\u0103ng ch\u1eafn gi\u00f3. \u0110ai r\u1eebng c\u00f3 k\u1ebft c\u1ea5u th\u01b0a c\u00f3 kh\u1ea3 n\u0103ng ch\u1eafn gi\u00f3 k\u00e9m h\u01a1n \u0111ai r\u1eebng c\u00f3 k\u1ebft c\u1ea5u h\u01a1i k\u00edn v\u00e0 k\u00edn trong ph\u1ea1m vi t\u1eeb 0-80 m (0-16H) sau \u0111ai; hi\u1ec7u n\u0103ng ph\u00f2ng h\u1ed9 c\u1ee7a r\u00fa c\u00e1t th\u01b0a l\u00e0: 29% ; r\u00fa c\u00e1t h\u01a1i k\u00edn l\u00e0: <\/b>35-39% v\u00e0 r\u00fa c\u00e1t k\u00edn l\u00e0: <\/b>30%. K\u1ebft c\u1ea5u \u0111ai c\u00f3 \u1ea3nh h\u01b0\u1edfng t\u1edbi kh\u1ea3 n\u0103ng ch\u1eafn gi\u00f3 trong ph\u1ea1m vi 0-80 m sau \u0111ai (0-16H) v\u00e0 \u1ea3nh h\u01b0\u1edfng kh\u00f4ng \u0111\u00e1ng k\u1ec3 trong ph\u1ea1m vi 80-100 m sau \u0111ai (16H-20H). R\u1eebng S\u1edf tr\u1ed3ng l\u00e2u n\u0103m c\u00f3 kh\u1ea3 n\u0103ng ph\u00f2ng h\u1ed9 kh\u00e1 t\u1ed1t, t\u1ed1c \u0111\u1ed9 gi\u00f3 sau \u0111ai 20, 40 m ch\u1ec9 c\u00f2n 33, 54% so v\u1edbi tr\u01b0\u1edbc \u0111ai; trong ph\u1ea1m vi 16H-20H t\u1ed1c \u0111\u1ed9 gi\u00f3 sau \u0111ai c\u00f2n 72-78%; hi\u1ec7u n\u0103ng ph\u00f2ng h\u1ed9 l\u00e0: 39%. R\u00fa c\u00f3 k\u1ebft c\u1ea5u k\u00edn ph\u1ea1m vi ch\u1eafn gi\u00f3 t\u1ed1t nh\u1ea5t trong ph\u1ea1m vi 20-40m sau \u0111ai, trong ph\u1ea1m vi n\u00e0y kh\u1ea3 n\u0103ng ch\u1eafn gi\u00f3 t\u1ed1t h\u01a1n r\u00fa c\u00f3 k\u1ebft c\u1ea5u h\u01a1i k\u00edn v\u00e0 th\u01b0a.<\/p>\n

 <\/p>\n

2. 2. C\u1ea3i thi\u1ec7n \u0111\u1ed9 \u1ea9m t\u01b0\u01a1ng \u0111\u1ed1i v\u00e0 nhi\u1ec7t \u0111\u1ed9 kh\u00f4ng kh\u00ed<\/i><\/b><\/p>\n

M\u1ed7i lo\u00e0i c\u00e2y tr\u1ed3ng \u0111\u1ec1u th\u00edch h\u1ee3p v\u1edbi m\u1ed9t bi\u00ean \u0111\u1ed9 nhi\u1ec7t, \u1ea9m kh\u00e1c nhau, nhi\u1ec7t \u0111\u1ed9 v\u00e0 \u0111\u1ed9 \u1ea9m qu\u00e1 cao ho\u1eb7c qu\u00e1 th\u1ea5p \u0111\u1ec1u \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn sinh tr\u01b0\u1edfng v\u00e0 ph\u00e1t tri\u1ec3n c\u1ee7a ch\u00fang. Ng\u01b0\u1ee3c l\u1ea1i, trong qu\u00e1 tr\u00ecnh sinh tr\u01b0\u1edfng v\u00e0 ph\u00e1t tri\u1ec3n c\u00e2y r\u1eebng c\u00f3 kh\u1ea3 n\u0103ng l\u00e0m thay \u0111\u1ed5i \u0111i\u1ec1u ki\u1ec7n ti\u1ec3u kh\u00ed h\u1eadu n\u01a1i m\u00e0 ch\u00fang sinh s\u1ed1ng. \u0110i\u1ec1u n\u00e0y \u0111\u1eb7c bi\u1ec7t quan tr\u1ecdng v\u00e0 c\u00f3 \u00fd ngh\u0129a \u0111\u1ed1i v\u1edbi v\u00f9ng \u0111\u1ea5t c\u00e1t ven bi\u1ec3n mi\u1ec1n Trung – n\u01a1i c\u00f3 \u0111i\u1ec1u ki\u1ec7n kh\u00ed h\u1eadu kh\u1eafc nghi\u1ec7t nh\u1ea5t v\u00e0o nh\u1eefng ng\u00e0y h\u00e8 n\u00f3ng n\u1ef1c. S\u1edf Camellia sasanqua <\/i>l\u00e0 m\u1ed9t trong nh\u1eefng lo\u00e0i c\u00f3 kh\u1ea3 n\u0103ng th\u00edch nghi \u0111\u01b0\u1ee3c v\u1edbi v\u00f9ng c\u00e1t n\u00f3ng B\u00ecnh – Tr\u1ecb – Thi\u00ean, ch\u00fang m\u1ecdc t\u1ef1 nhi\u00ean v\u00e0 \u0111\u01b0\u1ee3c g\u00e2y tr\u1ed3ng h\u00e0ng tr\u0103m n\u0103m nay, tuy nhi\u00ean cho t\u1edbi nay c\u0169ng ch\u01b0a c\u00f3 m\u1ed9t \u0111\u00e1nh gi\u00e1 n\u00e0o v\u1ec1 v\u1ea5n \u0111\u1ec1 n\u00e0y. S\u1ed1 li\u1ec7u nghi\u00ean c\u1ee9u c\u1ee7a \u0111\u1ec1 t\u00e0i \u0111\u01b0\u1ee3c tr\u00ecnh b\u00e0y \u1edf b\u1ea3ng 2.<\/p>\n

 <\/p>\n

B\u1ea3ng 2: Nhi\u1ec7t \u0111\u1ed9 v\u00e0 \u1ea9m \u0111\u1ed9 kh\u00f4ng kh\u00ed trong v\u00e0 ngo\u00e0i r\u1eebng S\u1edf .<\/i><\/p>\n\n\n\n\n\n\n\n\n\n\n
\n

\u00a7\u00e8i t\u00ad\u00eeng<\/b><\/p>\n<\/td>\n

\n

\n

V\u00de tr\u00dd<\/b><\/p>\n<\/td>\n

\n

Nhi\u1ec7t \u0111\u1ed9 ( 0<\/sup>C)<\/b><\/p>\n<\/td>\n

\n

\u1ea9m \u0111\u1ed9 t\u01b0\u01a1ng \u0111\u1ed1i (%)<\/b><\/p>\n<\/td>\n<\/tr>\n

\n

Trung b\u00ecnh<\/b><\/p>\n<\/td>\n

\n

T\u1ed1i cao<\/b><\/p>\n<\/td>\n

\n

T\u1ed1i th\u1ea5p<\/b><\/p>\n<\/td>\n

\n

Bi\u00ean \u0111\u1ed9<\/b><\/p>\n<\/td>\n

\n

Trung b\u00ecnh<\/b><\/p>\n<\/td>\n

\n

T\u1ed1i cao<\/b><\/p>\n<\/td>\n

\n

T\u1ed1i th\u1ea5p<\/b><\/p>\n<\/td>\n

\n

Bi\u00ean \u0111\u1ed9<\/b><\/p>\n<\/td>\n<\/tr>\n

\n

R\u00f3 c\u00b8t h\u00aci k\u00ddn<\/p>\n<\/td>\n

\n\u00a7\u00cat tr\u00e8ng<\/td>\n\n

35<\/p>\n<\/td>\n

\n

40,5<\/p>\n<\/td>\n

\n

31,0<\/p>\n<\/td>\n

\n

9,5<\/p>\n<\/td>\n

\n

65<\/p>\n<\/td>\n

\n

78<\/p>\n<\/td>\n

\n

49<\/p>\n<\/td>\n

\n

29<\/p>\n<\/td>\n<\/tr>\n

\nTrong r\u00f3 c\u00b8t<\/td>\n\n

32,5<\/p>\n<\/td>\n

\n

36,0<\/p>\n<\/td>\n

\n

29,5<\/p>\n<\/td>\n

\n

6,5<\/p>\n<\/td>\n

\n

68<\/p>\n<\/td>\n

\n

88<\/p>\n<\/td>\n

\n

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

\n

36<\/p>\n<\/td>\n<\/tr>\n

\nCh\u00aanh l\u00d6ch<\/td>\n\n

2,5<\/p>\n<\/td>\n

\n

4,5<\/p>\n<\/td>\n

\n

1,5<\/p>\n<\/td>\n

\n

3,0<\/p>\n<\/td>\n

\n

3<\/p>\n<\/td>\n

\n

10<\/p>\n<\/td>\n

\n

3<\/p>\n<\/td>\n

\n

7<\/p>\n<\/td>\n<\/tr>\n

\n

R\u00f5ng tr\u00e5ng<\/p>\n<\/td>\n

\n\u00a7\u00cat tr\u00e8ng<\/td>\n\n

36,5<\/p>\n<\/td>\n

\n

41,0<\/p>\n<\/td>\n

\n

33,5<\/p>\n<\/td>\n

\n

7,5<\/p>\n<\/td>\n

\n

64<\/p>\n<\/td>\n

\n

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

\n

46<\/p>\n<\/td>\n

\n

24<\/p>\n<\/td>\n<\/tr>\n

\nTrong r\u00f5ng s\u00eb<\/td>\n\n

33,5<\/p>\n<\/td>\n

\n

36,5<\/p>\n<\/td>\n

\n

31,5<\/p>\n<\/td>\n

\n

5,0<\/p>\n<\/td>\n

\n

69<\/p>\n<\/td>\n

\n

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

\n

51<\/p>\n<\/td>\n

\n

26<\/p>\n<\/td>\n<\/tr>\n

\nCh\u00aanh l\u00d6ch<\/td>\n\n

3,0<\/p>\n<\/td>\n

\n

5,5<\/p>\n<\/td>\n

\n

2,0<\/p>\n<\/td>\n

\n

2,5<\/p>\n<\/td>\n

\n

5<\/p>\n<\/td>\n

\n

7<\/p>\n<\/td>\n

\n

5<\/p>\n<\/td>\n

\n

2<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Qua b\u1ea3ng 2 th\u1ea5y r\u1eb1ng r\u00fa c\u00e1t v\u00e0 r\u1eebng tr\u1ed3ng S\u1edf c\u00f3 kh\u1ea3 n\u0103ng c\u1ea3i thi\u1ec7n ch\u1ebf \u0111\u1ed9 nhi\u1ec7t v\u00e0 \u1ea9m \u0111\u1ed9 kh\u00f4ng kh\u00ed t\u1ed1t th\u1ec3 hi\u1ec7n: Nhi\u1ec7t \u0111\u1ed9 b\u00ecnh qu\u00e2n \u1edf trong r\u1eebng th\u1ea5p h\u01a1n ngo\u00e0i r\u1eebng t\u1eeb 2,5-30<\/sup>C, nhi\u1ec7t \u0111\u1ed9 t\u1ed1i cao trong c\u00e1c l\u1ea7n \u0111o \u1edf trong r\u1eebng th\u1ea5p h\u01a1n ngo\u00e0i r\u1eebng t\u1eeb 4,5-5,50<\/sup>C v\u00e0 nhi\u1ec7t \u0111\u1ed9 t\u1ed1i th\u1ea5p trong r\u1eebng th\u1ea5p h\u01a1n ngo\u00e0i r\u1eebng t\u1eeb 1,5-20<\/sup>C, bi\u00ean \u0111\u1ed9 nhi\u1ec7t trong r\u1eebng bi\u1ebfn \u0111\u1ed9ng \u00edt h\u01a1n ngo\u00e0i r\u1eebng 2,5-30<\/sup>C. Nhi\u1ec7t \u0111\u1ed9 t\u1ed1i cao \u1edf ngo\u00e0i \u0111\u1ea5t tr\u1ed1ng v\u1ec1 ban ng\u00e0y t\u1eeb 40-410<\/sup>C r\u1ea5t h\u1ea1n ch\u1ebf \u0111\u1ebfn s\u1ef1 sinh tr\u01b0\u1edfng c\u1ee7a c\u00e2y tr\u1ed3ng tr\u00ean v\u00f9ng \u0111\u1ea5t c\u00e1t. Nhi\u1ec7t \u0111\u1ed9 trong r\u1eebng th\u1ea5p h\u01a1n v\u00e0 m\u1ee9c \u0111\u1ed9 bi\u1ebfn \u0111\u1ed5i v\u1ec1 nhi\u1ec7t \u0111\u1ed9 \u00edt h\u01a1n ngo\u00e0i \u0111\u1ea5t tr\u1ed1ng n\u00ean ph\u00f9 h\u1ee3p h\u01a1n v\u1edbi \u0111i\u1ec1u ki\u1ec7n s\u1ed1ng c\u1ee7a nhi\u1ec1u lo\u00e0i th\u1ef1c v\u1eadt th\u1ef1c v\u1eadt tr\u00ean v\u00f9ng \u0111\u1ea5t c\u00e1t kh\u00f4 n\u00f3ng.<\/p>\n

V\u1ec1 \u1ea9m \u0111\u1ed9 t\u01b0\u01a1ng \u0111\u1ed1i, c\u00f3 s\u1ef1 bi\u1ebfn \u0111\u1ed5i theo qui lu\u1eadt khi nhi\u1ec7t \u0111\u1ed9 cao th\u00ec \u1ea9m \u0111\u1ed9 kh\u00f4ng kh\u00ed th\u1ea5p v\u00e0 ng\u01b0\u1ee3c l\u1ea1i. \u1ea9m \u0111\u1ed9 kh\u00f4ng kh\u00ed trung b\u00ecnh v\u00e0 t\u1ed1i th\u1ea5p trong r\u1eebng lu\u00f4n cao h\u01a1n \u1ea9m \u0111\u1ed9 kh\u00f4ng kh\u00ed ngo\u00e0i \u0111\u1ea5t tr\u1ed1ng 3-5%; \u1ea9m \u0111\u1ed9 t\u1ed1i cao trong r\u1eebng cao h\u01a1n ngo\u00e0i \u0111\u1ea5t tr\u1ed1ng 7-10%. Trong ng\u00e0y \u0111\u1ed9 \u1ea9m kh\u00f4ng kh\u00ed bi\u1ebfn \u0111\u1ed5i r\u1ea5t l\u1edbn k\u1ec3 c\u1ea3 trong r\u1eebng v\u00e0 ngo\u00e0i \u0111\u1ea5t tr\u1ed1ng (t\u1eeb 24-36%).<\/p>\n

 <\/p>\n

2.3. Thay \u0111\u1ed5i c\u01b0\u1eddng \u0111\u1ed9 b\u1ee9c x\u1ea1<\/i><\/b><\/b><\/p>\n

 <\/p>\n

B\u1ea3ng 3. C\u01b0\u1eddng \u0111\u1ed9 b\u1ee9c x\u1ea1 trong r\u1eebng v\u00e0 ngo\u00e0i \u0111\u1ea5t tr\u1ed1ng.<\/i><\/p>\n\n\n\n\n\n\n\n\n\n
\n

\u0110\u1ed1i t\u01b0\u1ee3ng – \u0110\u1ecba \u0111i\u1ec3m<\/b><\/p>\n<\/td>\n

\n

V\u1ecb tr\u00ed<\/b><\/p>\n<\/td>\n

\n

C\u01b0\u1eddng \u0111\u1ed9 b\u1ee9c x\u1ea1 (Lux)<\/b><\/p>\n<\/td>\n<\/tr>\n

\nR\u00fa c\u00e1t h\u01a1i k\u00edn, Phong Thu -Phong \u0110i\u1ec1n- Th\u1eeba Thi\u00ean Hu\u1ebf<\/td>\n\nNgo\u00e0i \u0111\u1ea5t tr\u1ed1ng<\/td>\n\n

108177<\/p>\n<\/td>\n<\/tr>\n

\nTrong r\u00fa c\u00e1t<\/td>\n\n

14870<\/p>\n<\/td>\n<\/tr>\n

\nCh\u00eanh l\u1ec7ch<\/td>\n\n

93307<\/p>\n<\/td>\n<\/tr>\n

\nR\u1eebng tr\u1ed3ng S\u1edf, V\u0129nh Ch\u1ea5p- V\u0129nh Linh-Qu\u1ea3ng Tr\u1ecb<\/td>\n\nNgo\u00e0i \u0111\u1ea5t tr\u1ed1ng<\/td>\n\n

95533<\/p>\n<\/td>\n<\/tr>\n

\nTrong r\u1eebng s\u1edf<\/td>\n\n

13280<\/p>\n<\/td>\n<\/tr>\n

\nCh\u00eanh l\u1ec7ch<\/td>\n\n

82253<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

K\u1ebft qu\u1ea3 th\u1ec3 hi\u1ec7n \u1edf b\u1ea3ng 3 cho th\u1ea5y c\u01b0\u1eddng \u0111\u1ed9 b\u1ee9c x\u1ea1 ngo\u00e0i \u0111\u1ea5t tr\u1ed1ng r\u1ea5t l\u1edbn t\u1eeb 95533 Lux (\u1edf Phong \u0110i\u1ec1n) \u0111\u1ebfn 108177 Lux (\u1edf V\u0129nh Linh), cao g\u1ea5p g\u1ea7n 7 l\u1ea7n c\u01b0\u1eddng \u0111\u1ed9 b\u1ee9c x\u1ea1 trong r\u1eebng (14870 Lux \u1edf Phong \u0110i\u1ec1n v\u00e0 13280 Lux \u1edf V\u0129nh Linh). Nh\u1edd gi\u1ea3m \u0111\u01b0\u1ee3c c\u01b0\u1eddng \u0111\u1ed9 b\u1ee9c x\u1ea1 n\u00ean nhi\u1ec7t \u0111\u1ed9 v\u00e0 \u0111\u1ed9 \u1ea9m trong r\u1eebng \u0111\u1ec1u th\u1ea5p h\u01a1n so v\u1edbi ngo\u00e0i \u0111\u1ea5t tr\u1ed1ng, t\u1ea1o m\u00f4i tr\u01b0\u1eddng th\u00edch h\u1ee3p cho nhi\u1ec1u lo\u00e0i c\u00e2y sinh tr\u01b0\u1edfng ph\u00e1t tri\u1ec3n t\u1ed1t.<\/p>\n

 <\/p>\n

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

R\u1eebng tr\u1ed3ng S\u1edf v\u00e0 r\u00fa c\u00e1t trong \u0111\u00f3 S\u1edf l\u00e0 m\u1ed9t trong nh\u1eefng lo\u00e0i c\u00e2y ch\u1ee7 y\u1ebfu (IV= 7,22-75,85%) c\u00f3 kh\u1ea3 n\u0103ng ph\u00f2ng h\u1ed9 ch\u1eafn gi\u00f3, c\u1ea3i thi\u1ec7n ch\u1ebf \u0111\u1ed9 nhi\u1ec7t, \u1ea9m, v\u00e0 c\u01b0\u1eddng \u0111\u1ed9 b\u1ee9c x\u1ea1 t\u1ed1t.<\/p>\n

– Trong ph\u1ea1m vi 100m (kho\u1ea3ng 20H) sau \u0111ai hi\u1ec7u n\u0103ng ph\u00f2ng h\u1ed9 c\u1ee7a r\u00fa c\u00e1t th\u01b0a l\u00e0: 29%; r\u00fa c\u00e1t h\u01a1i k\u00edn l\u00e0: <\/b>35-39% v\u00e0 r\u00fa c\u00e1t k\u00edn l\u00e0: <\/b>31%.<\/p>\n

– Nhi\u1ec7t \u0111\u1ed9 kh\u00f4ng kh\u00ed b\u00ecnh qu\u00e2n gi\u1ea3m \u0111i so v\u1edbi \u0111\u1ea5t tr\u1ed1ng t\u1eeb 2,5-30<\/sup>C.<\/p>\n

– \u1ea9m \u0111\u1ed9 kh\u00f4ng kh\u00ed b\u00ecnh qu\u00e2n t\u0103ng so v\u1edbi \u0111\u1ea5t tr\u1ed1ng t\u1eeb 3-5%.<\/p>\n

– B\u1ee9c x\u1ea1 b\u00ecnh qu\u00e2n gi\u1ea3m so v\u1edbi \u0111\u1ea5t tr\u1ed1ng l\u00e0 86%.<\/p>\n

 <\/p>\n

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

1. \u0110\u1ed7 Xu\u00e2n C\u1ea9m, \u0110\u1eb7ng Th\u00e1i D\u01b0\u01a1ng ( 2001), Nghi\u00ean c\u1ee9u tr\u1ed3ng th\u1eed nghi\u1ec7m m\u1ed9t s\u1ed1 lo\u00e0i c\u00e2y tr\u1ed3ng b\u1ea3n \u0111\u1ecba th\u00e2n g\u1ed7 tr\u00ean v\u00f9ng c\u00e1t n\u1ed9i \u0111\u1ed3ng huy\u1ec7n Phong \u0110i\u1ec1n-TT Hu\u1ebf<\/i>, S\u1edf Khoa h\u1ecdc C\u00f4ng ngh\u1ec7 v\u00e0 M\u00f4i tr\u01b0\u1eddng Th\u1eeba Thi\u00ean-Hu\u1ebf .<\/p>\n

2. Ph\u00e2n Vi\u1ec7n \u0110TQHR Trung Trung B\u1ed9 (2001), D\u1ef1 \u00e1n qui ho\u1ea1ch r\u1eebng ph\u00f2ng h\u1ed9 ven bi\u1ec3n t\u1ec9nh TT- Hu\u1ebf (giai \u0111o\u1ea1n 2001-2010)<\/i>, Th\u1eeba Thi\u00ean Hu\u1ebf.<\/p>\n

3. Ph\u00e2n Vi\u1ec7n \u0110TQHR Trung Trung B\u1ed9 (2001), D\u1ef1 \u00e1n qui ho\u1ea1ch r\u1eebng ph\u00f2ng h\u1ed9 ven bi\u1ec3n t\u1ec9nh Qu\u1ea3ng B\u00ecnh (giai \u0111o\u1ea1n 2001-2010)<\/i>, Th\u1eeba Thi\u00ean Hu\u1ebf.<\/p>\n

4. Ph\u00e2n Vi\u1ec7n \u0110TQHR Trung Trung B\u1ed9 (2001), D\u1ef1 \u00e1n qui ho\u1ea1ch r\u1eebng ph\u00f2ng h\u1ed9 ven bi\u1ec3n t\u1ec9nh Qu\u1ea3ng Tr\u1ecb (giai \u0111o\u1ea1n 2001-2010)<\/i>, Th\u1eeba Thi\u00ean Hu\u1ebf.<\/p>\n

5. Nguy\u1ec5n Ti\u1ebfn Th\u1ea3o, B\u00f9i Ng\u1ea1nh (1966), Tr\u1ed3ng r\u1eebng ph\u00f2ng h\u1ed9<\/i>, Gi\u00e1o tr\u00ecnh tr\u01b0\u1eddng \u0110\u1ea1i h\u1ecdc L\u00e2m nghi\u1ec7p.<\/p>\n

Summary<\/b><\/p>\n

Research on the capability of environment protection of C.sasanqua<\/i> plantation as a base for the planting, tending and thinning aimed at raising the protection value of C.sasanqua<\/i> plantation and bush vegetation on sand is very important. Research results on the capability of C.sasanqua<\/i> plantation and bush vegetation on sand in the Binh Tri Thien region show that:<\/p>\n

– Within 100m (about 20H) behind the belt, the protection effectiveness of thin bush vegetation on sand is 29%; rather closed bush vegetation on sand is 35-39% and closed bush vegetation on sand is 31%.<\/p>\n

– Mean air temperature is 2,5-30<\/sup>C reduced as compared with that in the open place.<\/p>\n

– Mean air humidity is 3-5% increased as compared with that in the open place.Mean radiation is 86% reduced as compared with that in the open place.<\/p>\n","protected":false},"excerpt":{"rendered":"

Ba t\u1ec9nh Qu\u1ea3ng B\u00ecnh, Qu\u1ea3ng Tr\u1ecb, Th\u1eeba Thi\u00ean Hu\u1ebf g\u1ecdi t\u1eaft l\u00e0 B\u00ecnh – Tr\u1ecb – Thi\u00ean c\u00f3 81.408,8 ha \u0111\u1ea5t c\u00e1t ven bi\u1ec3n, chi\u1ebfm 5,45% t\u1ed5ng di\u1ec7n t\u00edch t\u1ef1 nhi\u00ean. V\u00f9ng \u0111\u1ea5t c\u00e1t ven bi\u1ec3n B\u00ecnh -Tr\u1ecb -Thi\u00ean c\u00f3 v\u1ecb tr\u00ed chi\u1ebfn l\u01b0\u1ee3c quan tr\u1ecdng trong ph\u00e1t tri\u1ec3n kinh t\u1ebf – x\u00e3 h\u1ed9i v\u00e0 m\u00f4i tr\u01b0\u1eddng c\u1ee7a khu v\u1ef1c. \u0110\u00e2y c\u00f3 th\u1ec3 n\u00f3i l\u00e0 v\u00f9ng \u0111\u1ea5t r\u1ea5t kh\u00f3 kh\u0103n trong s\u1eed d\u1ee5ng v\u00ec \u0111i\u1ec1u ki\u1ec7n t\u1ef1 nhi\u00ean r\u1ea5t kh\u1eafc nghi\u1ec7t, \u0111\u1ea5t \u0111ai ngh\u00e8o dinh d\u01b0\u1ee1ng v\u00e0 th\u01b0\u1eddng xuy\u00ean ch\u1ecbu t\u00e1c \u0111\u1ed9ng c\u1ee7a gi\u00f3 b\u00e3o bi\u1ec3n.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[21],"tags":[],"_links":{"self":[{"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/posts\/474"}],"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=474"}],"version-history":[{"count":3,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/posts\/474\/revisions"}],"predecessor-version":[{"id":11552,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/posts\/474\/revisions\/11552"}],"wp:attachment":[{"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/media?parent=474"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/categories?post=474"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/tags?post=474"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}