{"id":8580,"date":"2009-03-24T02:18:48","date_gmt":"2009-03-23T19:18:48","guid":{"rendered":"http:\/\/vafs.gov.vn\/vn\/2009\/03\/ket-qua-xac-dinh-mot-so-tinh-chat-go-rung-trong-moc-nhanh-o-viet-nam\/"},"modified":"2019-09-25T10:22:15","modified_gmt":"2019-09-25T03:22:15","slug":"ket-qua-xac-dinh-mot-so-tinh-chat-go-rung-trong-moc-nhanh-o-viet-nam","status":"publish","type":"post","link":"https:\/\/vafs.gov.vn\/vn\/ket-qua-xac-dinh-mot-so-tinh-chat-go-rung-trong-moc-nhanh-o-viet-nam\/","title":{"rendered":"K\u1ebft qu\u1ea3 x\u00e1c \u0111\u1ecbnh m\u1ed9t s\u1ed1 t\u00ednh ch\u1ea5t g\u1ed7 r\u1eebng tr\u1ed3ng m\u1ecdc nhanh \u1edf Vi\u1ec7t Nam"},"content":{"rendered":"

Koichi Yamamoto*, Nguy\u1ec5n Tr\u1ecdng Nh\u00e2n <\/em><\/strong><\/p>\n

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

T\u00e0i nguy\u00ean g\u1ed7 r\u1eebng tr\u1ed3ng ng\u00e0y c\u00e0ng tr\u1edf n\u00ean quan tr\u1ecdng h\u01a1n do thi\u1ebfu t\u00e0i nguy\u00ean g\u1ed7 r\u1eebng t\u1ef1 nhi\u00ean. H\u01a1n n\u1eefa, v\u1ea5n \u0111\u1ec1 qu\u1ea3n l\u00fd r\u1eebng b\u1ec1n v\u1eefng \u0111\u00e3 khi\u1ebfn vi\u1ec7c s\u1eed d\u1ee5ng c\u00e1c ngu\u1ed3n r\u1eebng t\u1ef1 nhi\u00ean trong th\u1ebf k\u1ef7 21 s\u1ebd tr\u1edf n\u00ean kh\u00f3 kh\u0103n h\u01a1n so v\u1edbi tr\u01b0\u1edbc \u0111\u00e2y, c\u00e1c lo\u1ea1i l\u00e2m s\u1ea3n ch\u1ec9 chi\u1ebfm \u0111\u01b0\u1ee3c \u01b0u th\u1ebf tr\u00ean th\u1ecb tr\u01b0\u1eddng Qu\u1ed1c t\u1ebf n\u1ebfu \u0111\u01b0\u1ee3c c\u1ea5p ch\u1ee9ng ch\u1ec9 v\u1ec1 qu\u1ea3n l\u00fd b\u1ec1n v\u1eefng: ISO14001 ho\u1eb7c FSC (Forest Stewardship Council) (WWF 1997).<\/p>\n

Theo t\u00e0i li\u1ec7u c\u1ee7a C\u1ee5c ph\u00e1t tri\u1ec3n l\u00e2m nghi\u1ec7p, lo\u00e0i c\u00e2y tr\u1ed3ng r\u1eebng ch\u00ednh \u1edf Vi\u1ec7t Naml\u00e0 Eucalytus Camaldulensis, Pinus merkusii, Acacia auriculiformis<\/em>, v.v… Hi\u1ec7n nay g\u1ed7 r\u1eebng tr\u1ed3ng \u1edf Vi\u1ec7t Nam\u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng ch\u1ee7 y\u1ebfu l\u00e0m nguy\u00ean li\u1ec7u s\u1ea3n xu\u1ea5t gi\u1ea5y. Trong th\u1eddi gian t\u1edbi, g\u1ed7 r\u1eebng tr\u1ed3ng s\u1ebd tr\u1edf th\u00e0nh ngu\u1ed3n nguy\u00ean li\u1ec7u ch\u1ee7 y\u1ebfu \u0111\u1ec3 ch\u1ebf bi\u1ebfn c\u00e1c s\u1ea3n ph\u1ea9m g\u1ed7 x\u1ebb, v\u00e1n d\u00e1n, v\u00e1n d\u0103m… Do v\u1eady, vi\u1ec7c t\u00ecm hi\u1ec3u v\u00e0 \u0111\u00e1nh gi\u00e1 ch\u1ea5t l\u01b0\u1ee3ng ngu\u1ed3n nguy\u00ean li\u1ec7u \u0111\u1ec3 s\u1eed d\u1ee5ng hi\u1ec7u qu\u1ea3 g\u1ed7 r\u1eebng tr\u1ed3ng l\u00e0 r\u1ea5t c\u1ea7n thi\u1ebft.<\/p>\n

Trong ph\u1ea1m vi nghi\u00ean c\u1ee9u n\u00e0y, ch\u00fang t\u00f4i c\u1ed1 g\u1eafng l\u00e0m s\u00e1ng t\u1ecf m\u1ed9t ph\u1ea7n t\u00ednh ch\u1ea5t c\u1ee7a m\u1ed9t s\u1ed1 lo\u00e0i g\u1ed7 r\u1eebng tr\u1ed3ng \u1edf Vi\u1ec7t Nam, \u0111\u1eb7c bi\u1ec7t l\u00e0 A. mangium, A.auriculiformis, A. hybrid<\/em>.<\/p>\n

I. N\u1ed9i dung v\u00e0 ph\u01b0\u01a1ng ph\u00e1p th\u1ef1c nghi\u1ec7m<\/p>\n

T\u00ecm hi\u1ec3u t\u00ednh ch\u1ea5t c\u00e1c lo\u1ea1i g\u1ed7 r\u1eebng tr\u1ed3ng b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng khoan v\u00e0 thi\u1ebft b\u1ecb truy\u1ec1n s\u00f3ng \u1ee9ng su\u1ea5t th\u00f4ng qua h\u1ec7 th\u1ed1ng \u0111i\u1ec1u h\u00e0nh.<\/p>\n

\u0110\u1ecba \u0111i\u1ec3m ti\u1ebfn h\u00e0nh: Ba V\u00ec (H\u00e0 T\u00e2y), M\u00ea Linh (V\u0129nh Ph\u00fac), C\u1ea7u Hai (Ph\u00fa Th\u1ecd), th\u1ecb x\u00e3 Ho\u00e0 B\u00ecnh v\u00e0 m\u1ed9t s\u1ed1 n\u01a1i kh\u00e1c. Ngo\u00e0i ra, m\u1ed9t s\u1ed1 th\u00f4ng s\u1ed1 nh\u01b0 chi\u1ec1u cao v\u00fat ng\u1ecdn v\u00e0 \u0111\u01b0\u1eddng k\u00ednh c\u00e2y g\u1ed7 th\u00ed nghi\u1ec7m c\u0169ng \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh.<\/p>\n

1. M\u1eabu khoan sinh tr\u01b0\u1edfng <\/strong><\/p>\n

M\u1eabu khoan sinh tr\u01b0\u1edfng \u0111\u01b0\u1ee3c l\u1ea5y b\u1eb1ng khoan (Sounto, Finland) t\u1ea1i chi\u1ec1u cao ngang ng\u1ef1c c\u1ee7a c\u00e2y \u0111\u1ee9ng v\u00e0 m\u1eabu \u0111\u01b0\u1ee3c cu\u1ed9n ngay v\u00e0o gi\u1ea5y chuy\u00ean d\u00f9ng \u0111\u1eb7c bi\u1ec7t (Parafiln USA) \u0111\u1ec3 kh\u00f4ng b\u1ecb m\u1ea5t \u0111\u1ed9 \u1ea9m. M\u1eabu khoan sinh tr\u01b0\u1edfng (bao g\u1ed3m v\u1ecf c\u00e2y v\u00e0 ph\u1ea7n l\u00f5i g\u1ed7 c\u00f3 chi\u1ec1u d\u00e0i t\u1eeb 10 \u0111\u1ebfn 20 cm) \u0111\u01b0\u1ee3c mang v\u1ec1 ph\u00f2ng th\u00ed nghi\u1ec7m \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh \u0111\u1ed9 \u1ea9m v\u00e0 kh\u1ed1i l\u01b0\u1ee3ng th\u1ec3 t\u00edch.<\/p>\n

Kh\u1ed1i l\u01b0\u1ee3ng t\u01b0\u01a1i v\u00e0 kh\u00f4 c\u1ee7a c\u00e1c m\u1eabu \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh. T\u1ed5ng kh\u1ed1i l\u01b0\u1ee3ng \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh b\u1eb1ng ph\u01b0\u01a1ng ph\u00e1p thay th\u1ebf n\u01b0\u1edbc.<\/p>\n

T\u1eeb nh\u1eefng s\u1ed1 li\u1ec7u \u0111o \u0111\u01b0\u1ee3c, s\u1ebd \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh h\u00e0m l\u01b0\u1ee3ng \u1ea9m v\u00e0 kh\u1ed1i l\u01b0\u1ee3ng th\u1ec3 t\u00edch kh\u00f4.<\/p>\n

2. V\u1eadn t\u1ed1c truy\u1ec1n s\u00f3ng \u1ee9ng su\u1ea5t<\/strong><\/p>\n

V\u1eadn t\u1ed1c truy\u1ec1n s\u00f3ng \u1ee9ng su\u1ea5t xuy\u00ean qua th\u00e2n c\u00e2y s\u1ed1ng theo chi\u1ec1u d\u1ecdc \u0111\u01b0\u1ee3c \u0111o tr\u1ef1c ti\u1ebfp b\u1edfi thi\u1ebft b\u1ecb \u0111o Transmission meter [k\u00fd hi\u1ec7u FFKOPP microsecond meter (Alnus, Bt., Hungary)] \u0111\u1ec3 d\u1ef1 b\u00e1o kh\u1ed1i l\u01b0\u1ee3ng th\u1ec3 t\u00edch v\u00e0 \u0111\u1ed9 b\u1ec1n c\u1ee7a g\u1ed7.<\/p>\n

Hai chi\u1ebfc \u0111inh c\u00f3 \u0111\u01b0\u1eddng k\u00ednh 5 mm \u0111\u01b0\u1ee3c \u0111\u00f3ng s\u00e2u 10 mm v\u00e0o th\u00e2n c\u00e2y t\u00ednh t\u1eeb v\u1ecf c\u00e2y t\u1ea1i chi\u1ec1u cao ngang ng\u1ef1c. Kho\u1ea3ng c\u00e1ch gi\u1eefa 2 \u0111inh kho\u1ea3ng 100 cm. G\u00f5 b\u00faa v\u00e0o \u0111inh tr\u00ean v\u00e0 m\u00e1y s\u1ebd t\u1ef1 \u0111\u1ed9ng \u0111o th\u1eddi gian truy\u1ec1n s\u00f3ng \u1ee9ng su\u1ea5t t\u1eeb \u0111inh tr\u00ean xu\u1ed1ng \u0111inh d\u01b0\u1edbi. V\u1eadn t\u1ed1c truy\u1ec1n s\u00f3ng \u1ee9ng su\u1ea5t \u0111\u01b0\u1ee3c t\u00ednh b\u1eb1ng chi\u1ec1u d\u00e0i gi\u1eefa 2 \u0111inh (t\u00ednh b\u1eb1ng m\u00e9t) chia cho th\u1eddi gian truy\u1ec1n trung b\u00ecnh (t\u00ednh b\u1eb1ng gi\u00e2y).<\/p>\n

II. K\u1ebft qu\u1ea3 th\u1ef1c nghi\u1ec7m<\/p>\n

1. H\u00e0m l\u01b0\u1ee3ng \u1ea9m c\u00e2y g\u1ed7 <\/strong><\/p>\n

C\u00e1c s\u1ed1 li\u1ec7u c\u1ee7a h\u00e0m l\u01b0\u1ee3ng \u1ea9m t\u01b0\u01a1i (c\u00e2y s\u1ed1ng) t\u1eeb v\u1ecf c\u00e2y \u0111\u1ebfn l\u00f5i g\u1ed7 c\u1ee7a t\u1eebng c\u00e2y m\u1eabu \u0111\u01b0\u1ee3c ghi trong b\u1ea3ng 1. Nh\u00ecn chung h\u00e0m l\u01b0\u1ee3ng \u1ea9m t\u01b0\u01a1i c\u1ee7a ph\u1ea7n l\u00f5i cao h\u01a1n ph\u1ea7n d\u00e1c m\u1ed9t ch\u00fat, tuy nhi\u00ean s\u1ef1 kh\u00e1c bi\u1ec7t kh\u00f4ng r\u00f5 r\u00e0ng trong ph\u1ea7n l\u1edbn c\u00e1c m\u1eabu. Trong m\u1ed9t nghi\u00ean c\u1ee9u g\u1ea7n \u0111\u00e2y nh\u1ea5t t\u1ea1i Malaixia th\u00ec h\u1ea7u h\u1ebft c\u00e1c c\u00e2y A.mangium<\/em> b\u1ecb hi\u1ec7n t\u01b0\u1ee3ng l\u00f5i \u01b0\u1edbt (Wet heartwoot – l\u01b0\u1ee3ng \u1ea9m ch\u1ee9a trong ph\u1ea7n l\u00f5i cao h\u01a1n r\u1ea5t nhi\u1ec1u so v\u1edbi ph\u1ea7n d\u00e1c – Yamamoto et al. 1998). Hi\u1ec7n t\u01b0\u1ee3ng l\u00f5i \u01b0\u1edbt c\u00f3 th\u1ec3 coi nh\u01b0 m\u1ed9t d\u1ea1ng khuy\u1ebft t\u1eadt c\u1ee7a g\u1ed7 v\u00ec l\u01b0\u1ee3ng \u1ea9m l\u1edbn ch\u1ee9a trong l\u00f5i s\u1ebd g\u00e2y kh\u00f3 kh\u0103n cho qu\u00e1 tr\u00ecnh s\u1ea5y g\u1ed7. Nh\u01b0ng ph\u1ea7n l\u1edbn c\u00e1c c\u00e2y Acacia \u1edf Vi\u1ec7t Namkh\u00f4ng c\u00f3 hi\u1ec7n t\u01b0\u1ee3ng n\u00e0y.<\/p>\n

B\u1ea3ng1. H\u00e0m l\u01b0\u1ee3ng \u1ea9m c\u1ee7a A.mangium, A.auriculiformis, A.hybrid<\/em> t\u1ea1i ph\u1ea7n l\u00f5i trong, l\u00f5i ngo\u00e0i v\u00e0 ph\u1ea7n d\u00e1c<\/p>\n

C\u00e2y No.* Lo\u00e0i** Tu\u1ed5i L\u00f5i (ngo\u00e0i) L\u00f5i (trong) D\u00e1c<\/p>\n

m\u1eabu (n\u0103m) (%) (%) (%)<\/p>\n

B-3 M 6 94-104 113-114 105-111<\/p>\n

V-1 M 12 38-71 84-106 81-91<\/p>\n

V-2 M 12 85-90 85-97 75-86<\/p>\n

V-7 M 5 186-253 122-134 125-138<\/p>\n

C-1 M 8 149-196 113-114 139<\/p>\n

C-2 M 8 110-157 121-129 127-138<\/p>\n

C-3 M 8 123-132 125-136 109-118<\/p>\n

B-2 A 6 100-201 100-104 98-110<\/p>\n

V-3 A 12 119-127 85-108 82-94<\/p>\n

V-4 A 12 117-125 86-105 90-92<\/p>\n

B-1 H 6 97-130 123-145 116-128<\/p>\n

B-4 H 6 90-93 95-103 104-106<\/p>\n

V-5 H 3.5 107-191 118-156 103-111<\/p>\n

V-6 H 3.5 109 113-124 108-139<\/p>\n

V-8 H 5 125-163 135-150 145-170<\/p>\n

H-1 H 3 96-97 —— 93-206<\/p>\n

H-2 H 3 83-116 125 126-178<\/p>\n

*B: Bavi, V: Vinh Phuc, C: Cau Hai, H: Hoa Binh<\/p>\n

**A: A.auriculiformi<\/em>s, M: A.mangium<\/em>, H: A.hybrid<\/em><\/p>\n

2. Kh\u1ed1i l\u01b0\u1ee3ng th\u1ec3 t\u00edch kh\u00f4 c\u1ee7a g\u1ed7<\/strong><\/p>\n

C\u00e1c s\u1ed1 li\u1ec7u v\u1ec1 kh\u1ed1i l\u01b0\u1ee3ng th\u1ec3 t\u00edch kh\u00f4 c\u1ee7a g\u1ed7 t\u00ednh t\u1eeb ngo\u00e0i v\u00e0o th\u00e2n c\u00e2y c\u1ee7a t\u1eebng c\u00e2y m\u1eabu \u0111\u01b0\u1ee3c ghi trong B\u1ea3ng 2. Theo c\u00e1c s\u1ed1 li\u1ec7u thu \u0111\u01b0\u1ee3c, gi\u1eefa c\u00e1c lo\u00e0i c\u00e2y c\u00f3 \u0111\u1ed9 tu\u1ed5i kh\u00e1c nhau c\u0169ng kh\u00f3 t\u00ecm th\u1ea5y xu h\u01b0\u1edbng chung c\u1ee7a kh\u1ed1i l\u01b0\u1ee3ng th\u1ec3 t\u00edch. Kh\u1ed1i l\u01b0\u1ee3ng th\u1ec3 t\u00edch kh\u00f4 bao gi\u1edd c\u0169ng th\u1ea5p nh\u1ea5t \u1edf ph\u1ea7n l\u00f5i v\u00e0 t\u0103ng d\u1ea7n v\u1ec1 ph\u00eda ph\u1ea7n d\u00e1c. \u0110\u00f4i khi c\u0169ng t\u00ecm th\u1ea5y kh\u1ed1i l\u01b0\u1ee3ng th\u1ec3 t\u00edch l\u1edbn nh\u1ea5t trong v\u00f9ng l\u00f5i, c\u0169ng c\u00f3 th\u1ec3 l\u00e0 do s\u1ef1 c\u00f3 m\u1eb7t c\u1ee7a c\u00e1c ch\u1ea5t chi\u1ebft xu\u1ea5t. Trong tr\u01b0\u1eddng h\u1ee3p n\u00e0y, kh\u1ed1i l\u01b0\u1ee3ng th\u1ec3 t\u00edch th\u1ea5p quanh t\u00e2m g\u1ed7 th\u01b0\u1eddng ph\u00e2n b\u1ed1 \u1edf g\u1ea7n ho\u1eb7c xung quanh t\u00e2m g\u1ed7.<\/p>\n

Kh\u1ed1i l\u01b0\u1ee3ng th\u1ec3 t\u00edch c\u1ee7a c\u00e2y A.hybrid<\/em> th\u01b0\u1eddng n\u1eb1m \u1edf v\u1ecb tr\u00ed trung gian c\u1ee7a A.mangium<\/em> v\u00e0 A.auriculiformis <\/em>(Kah 1996, Kah et al. 1997) Hi\u1ec7n t\u01b0\u1ee3ng \u0111\u00e3 n\u00eau c\u0169ng g\u1eb7p trong nghi\u00ean c\u1ee9u n\u00e0y.<\/p>\n

B\u1ea3ng 2. Kh\u1ed1i l\u01b0\u1ee3ng th\u1ec3 t\u00edch kh\u00f4 c\u1ef1c \u0111\u1ea1i v\u00e0 c\u1ef1c ti\u1ec3u c\u1ee7a A.mangium,<\/em> A.auriculiformis<\/em> v\u00e0 A.hybrid<\/em>.<\/p>\n

C\u00e2y No.* Lo\u00e0i* Tu\u1ed5i KLTT ***-min KLTT***-max<\/p>\n

m\u1eabu (n\u0103m) (g\/cm3<\/sup>) (g\/cm3<\/sup>)<\/p>\n

B-3 M 6 0.40(P)*** 0.57(O-S)***<\/p>\n

V-1 M 12 0.38(P) 0.67(M-S)<\/p>\n

V-2 M 12 0.58(P) 0.72(O-S)<\/p>\n

V-7 M 5 0.28(P) 0.57(M-H)<\/p>\n

C-1 M 8 0.39(P) 0.61(O-S)<\/p>\n

C-2 M 8 0.38(P) 0.55(O-S)<\/p>\n

C-3 M 8 0.38(P) 0.52(O-S)<\/p>\n

Trung b\u00d7nh 0.40 0.60<\/em><\/strong><\/p>\n

B-2 A 6 0.38(P) 0.64(M-H)<\/p>\n

V-3 A 12 0.45(P) 0.70(O-H)<\/p>\n

V-4 A 12 0.52(P) 0.82(O-H)<\/p>\n

Trung b\u00d7nh 0.45 0.72<\/em><\/strong><\/p>\n

B-1 H 6 0.42(P) 0.52(O-S)<\/p>\n

B-4 H 6 0.52(P) 0.71(O-S)<\/p>\n

V-5 H 3.5 0.39(P) 0.73(O-S)<\/p>\n

V-6 H 3.5 0.48(P) 0.60(O-S)<\/p>\n

V-8 H 5 0.37(P) 0.50((O-H)<\/p>\n

H-1 H 3 0.30(P) 0.38(O-S)<\/p>\n

H-2 H 3 0.29(P) 0.40(O-S)<\/p>\n

Trung b\u00d7nh<\/em><\/strong> 0.40 0.58<\/em><\/strong><\/p>\n

*B: Ba V\u00ec, V: V\u0129nh Ph\u00fac, C: C\u1ea7u Hai, H: Ho\u00e0 B\u00ecnh<\/p>\n

**A: A.auriculiformis<\/em>, M: A.mangium,<\/em> H: A.hybrid<\/em><\/p>\n

***(P): Ru\u1ed9t c\u00e2y, (O-H): L\u00f5i ngo\u00e0i, (M-H): L\u00f5i gi\u1eefa<\/p>\n

(O-S): D\u00e1c ngo\u00e0i, (M-S): D\u00e1c gi\u1eefa,<\/p>\n

(KLTT) Kh\u1ed1i l\u01b0\u1ee3ng th\u1ec3 t\u00edch<\/p>\n

3. \u0110\u1ed9 tr\u00f2n th\u00e2n c\u00e2y<\/strong><\/p>\n

\u0110\u1ed9 tr\u00f2n th\u00e2n c\u00e2y t\u1ea1i chi\u1ec1u cao ngang ng\u1ef1c \u0111\u01b0\u1ee3c \u0111o b\u1eb1ng s\u1ef1 kh\u00e1c bi\u1ec7t gi\u1eefa \u0111\u01b0\u1eddng k\u00ednh l\u1edbn nh\u1ea5t v\u00e0 nh\u1ecf nh\u1ea5t \u0111\u1ed1i v\u1edbi \u0111\u01b0\u1eddng k\u00ednh trung b\u00ecnh (B\u1ea3ng 3). T\u1ef7 s\u1ed1 n\u00e0y c\u00e0ng nh\u1ecf, c\u00e2y g\u1ed7 c\u00e0ng tr\u00f2n \u0111\u1ec1u h\u01a1n. T\u1ef7 s\u1ed1 trung b\u00ecnh \u0111\u1ed9 tr\u00f2n th\u00e2n c\u00e2y c\u1ee7a A.mangium<\/em> v\u00e0 A.auriculiformis<\/em> v\u00e0 c\u00e2y lai \u1edf trung gian l\u00e0 0,128, 0,087 v\u00e0 0,095. T\u1ef7 s\u1ed1 \u0111\u1ed9 tr\u00f2n th\u00e2n c\u00e2y nh\u1ecf nh\u1ea5t \u1edf A.auriculifomis<\/em> ti\u1ebfp theo l\u00e0 c\u00e2y lai, cu\u1ed1i c\u00f9ng l\u00e0 A.mangium<\/em>. Tuy n\u1eb1m trung gian gi\u1eefa A.mangium<\/em> v\u00e0 A.auriculiformis<\/em> nh\u01b0ng \u0111\u1ed9 tr\u00f2n th\u00e2n c\u00e2y lai g\u1ea7n A.auriculiformis<\/em> h\u01a1n.<\/p>\n

B\u1ea3ng 3. \u0110\u01b0\u1eddng k\u00ednh c\u1ef1c \u0111\u1ea1i, c\u1ef1c ti\u1ec3u v\u00e0 trung b\u00ecnh c\u1ee7a A.mangium, A.auriculiformis<\/em>, v\u00e0 A.hybrid<\/em><\/p>\n

C\u00e2yNo.* Lo\u00e0i** Tu\u1ed5i HS\u0110K*** \u0110KTB *** T\u1ef7 s\u1ed1<\/p>\n

m\u1eabu (n\u0103m) (cm) (cm) (HS\u0110K\/\u0110KTB)<\/p>\n

B-3 M 6 2.8 16.9 0.166<\/p>\n

V-1 M 12 2.0 14.8 0.135<\/p>\n

V-2 M 12 2.0 16.3 0.123<\/p>\n

V-7 M 5 1.9 19.7 0.096<\/p>\n

C-1 M 8 2.6 25.9 0.100<\/p>\n

C-2 M 8 2.4 15.8 0.152<\/p>\n

C-3 M 8 2.8 23.2 0.121<\/p>\n

Trung b\u00d7nh 0.128<\/em><\/strong><\/p>\n

B-2 A 6 1.3 15.1 0.086<\/p>\n

V-3 A 12 1.4 20.3 0.069<\/p>\n

V-4 A 12 1.4 13.2 0.106<\/p>\n

Trung b\u00d7nh 0.087<\/em><\/strong><\/p>\n

B-1 H 6 2.2 16.1 0.138<\/p>\n

B-4 H 6 2.5 28.4 0.088<\/p>\n

V-5 H 3.5 0.8 8.8 0.091<\/p>\n

V-6 H 3.5 0.4 10.4 0.038<\/p>\n

V-8 H 5 5.7 25.4 0.224<\/p>\n

H-1 H 3 0.9 11.3 0.080<\/p>\n

H-2 H 3 0.1 11.3 0.009<\/p>\n

Trung b\u00d7nh 0.095<\/em><\/strong><\/p>\n

*B: Ba V\u00ec, V: V\u0129nh Ph\u00fac, C: C\u1ea7u Hai, H: Ho\u00e0 B\u00ecnh<\/p>\n

**A: A.auriculiformis<\/em>, M: A.mangium<\/em>, H: A.hybrid<\/em><\/p>\n

***(<\/strong>HS\u0110K) hi\u1ec7u s\u1ed1 \u0111\u01b0\u1eddng k\u00ednh l\u1edbn v\u00e0 nh\u1ecf, (\u0110KTB) \u0111\u01b0\u1eddng k\u00ednh trung b\u00ecnh<\/p>\n

4. V\u1eadn t\u1ed1c truy\u1ec1n s\u00f3ng \u1ee9ng su\u1ea5t<\/strong><\/p>\n

\u0110\u00e2y l\u00e0 ph\u01b0\u01a1ng ph\u00e1p x\u00e1c \u0111\u1ecbnh \u0111\u1ed9 b\u1ec1n c\u1ee7a g\u1ed7 m\u00e0 kh\u00f4ng c\u1ea7n ph\u00e1 hu\u1ef7 c\u00e2y g\u1ed7. N\u1ebfu g\u1ed7 c\u00e0ng b\u1ec1n th\u00ec v\u1eadn t\u1ed1c truy\u1ec1n s\u00f3ng \u1ee9ng su\u1ea5t qua g\u1ed7 c\u00e0ng cao. H\u00e0m l\u01b0\u1ee3ng \u1ea9m cao l\u00e0m gi\u1ea3m v\u1eadn t\u1ed1c s\u00f3ng \u1ee9ng su\u1ea5t. B\u1ea3ng 4 ghi k\u1ebft qu\u1ea3 v\u1eadn t\u1ed1c s\u00f3ng \u1ee9ng su\u1ea5t d\u1ecdc theo th\u00e2n c\u00e2y s\u1ed1ng. C\u00f3 m\u1ed1i t\u01b0\u01a1ng quan thu\u1eadn gi\u1eefa kh\u1ed1i l\u01b0\u1ee3ng th\u1ec3 t\u00edch v\u00e0 v\u1eadn t\u1ed1c s\u00f3ng. Tuy kh\u00f4ng th\u1ec3 so s\u00e1nh k\u1ebft qu\u1ea3 gi\u1eefa c\u00e1c lo\u00e0i c\u00e2y v\u00ec tu\u1ed5i c\u1ee7a c\u00e1c c\u00e2y m\u1eabu kh\u00e1c nhau v\u00e0 s\u1ed1 l\u01b0\u1ee3ng c\u00e2y m\u1eabu kh\u00f4ng nhi\u1ec1u, nh\u01b0ng c\u00f3 th\u1ec3 \u01b0\u1edbc \u0111o\u00e1n kh\u1ed1i l\u01b0\u1ee3ng th\u1ec3 t\u00edch v\u00f9ng ngo\u00e0i c\u00f9ng th\u00e2n g\u1ed7 b\u1eb1ng ph\u01b0\u01a1ng ph\u00e1p n\u00e0y.<\/p>\n

5. Hi\u1ec7n t\u01b0\u1ee3ng th\u00e2n c\u00e2y r\u1ed7ng ru\u1ed9t <\/strong><\/p>\n

Trong nghi\u00ean c\u1ee9u n\u00e0y c\u00f3 17 c\u00e2y m\u1eabu \u0111\u1ec1u kh\u00f4ng th\u1ea5y hi\u1ec7n t\u01b0\u1ee3ng r\u1ed7ng ru\u1ed9t xu\u1ea5t hi\u1ec7n trong c\u00e1c m\u1eabu khoan c\u1ee7a c\u1ea3 A.mangium<\/em> v\u00e0 A.auriculiformis<\/em>. T\u1ea1i m\u1ed9t khu th\u00ed nghi\u1ec7m c\u1ee7a t\u1ec9nh Ho\u00e0 B\u00ecnh, b\u1eb1ng m\u1eaft th\u01b0\u1eddng c\u0169ng kh\u00f4ng ph\u00e1t hi\u1ec7n th\u1ea5y hi\u1ec7n t\u01b0\u1ee3ng r\u1ed7ng ru\u1ed9t. T\u01b0\u01a1ng t\u1ef1, khi quan s\u00e1t \u1edf V\u0129nh Ph\u00fac \u0111\u00e3 quan s\u00e1t c\u00e1c c\u00e2y 12 n\u0103m tu\u1ed5i A.mangium<\/em> v\u00e0 A.auriculiformis<\/em> th\u00ec ch\u1ec9 c\u00f3 1 trong 13 c\u00e2y A.mangium<\/em> b\u1ecb r\u1ed7ng ru\u1ed9t v\u1edbi \u0111\u01b0\u1eddng k\u00ednh 3 cm c\u00f2n A.auriculiformis<\/em> th\u00ec kh\u00f4ng. Nhi\u1ec1u ng\u01b0\u1eddi cho r\u1eb1ng A.mangium<\/em> l\u00e0 lo\u00e0i c\u00e2y d\u1ec5 b\u1ecb r\u1ed7ng ru\u1ed9t. Hi\u1ec7n t\u01b0\u1ee3ng b\u1ecb r\u1ed7ng ru\u1ed9t th\u01b0\u1eddng xuy\u00ean \u0111\u01b0\u1ee3c nh\u1eafc t\u1edbi \u1edf Malaxia. Ch\u1ec9 s\u1ed1 r\u1ed7ng ru\u1ed9t chi\u1ebfm t\u1edbi h\u01a1n 50%. C\u00e2y A.mangium<\/em> m\u1ecdc r\u1ea5t nhi\u1ec1u c\u00e0nh t\u1eeb tu\u1ed5i th\u1ee9 3 v\u00e0 c\u00e1c c\u00e0nh ch\u1ebft v\u1eabn ti\u1ebfp t\u1ee5c b\u00e1m tr\u00ean th\u00e2n c\u00e2y t\u1eeb 3 \u0111\u1ebfn 5 n\u0103m. Th\u1ef1c t\u1ebf, t\u1ef7 l\u1ec7 b\u1ecb r\u1ed7ng ru\u1ed9t \u1edf c\u00e2y A. mangium chi\u1ebfm 10-50% sau 4 \u0111\u1ebfn 5 n\u0103m tu\u1ed5i \u1edf v\u00f9ng Sabah-Malaixia (Ito 1998) c\u00f2n A.auriculiformis<\/em> v\u00e0 c\u00e2y lai kh\u00f4ng c\u00f3 hi\u1ec7n t\u01b0\u1ee3ng n\u00e0y (Ito 1998). Trong c\u00e1c s\u1ed1 li\u1ec7u c\u1ee7a \u0111\u1ee3t nghi\u00ean c\u1ee9u n\u00e0y, \u1edf Vi\u1ec7t Nam, hi\u1ec7n t\u01b0\u1ee3ng r\u1ed7ng ru\u1ed9t c\u1ee7a A.mangium<\/em> v\u00e0 A.auriculiformis<\/em> v\u00e0 A.hybrid<\/em> kh\u00f4ng l\u00e0 v\u1ea5n \u0111\u1ec1 l\u1edbn.<\/p>\n

B\u1ea3ng 4. M\u1ed1i t\u01b0\u01a1ng quan gi\u1eefa kh\u1ed1i l\u01b0\u1ee3ng th\u1ec3 t\u00edch kh\u00f4 \u1edf ph\u1ea7n ngo\u00e0i c\u00f9ng v\u00e0 v\u1eadn t\u1ed1c s\u00f3ng \u1ee9ng su\u1ea5t<\/p>\n

C\u00e2y No.* Lo\u00e0i** Tu\u1ed5i (n\u0103m) V\u1eadn t\u1ed1c s\u00f3ng (m\/s) Kh\u1ed1i l\u01b0\u1ee3mg th\u1ec3 t\u00edch (g\/cm3<\/sup>)<\/p>\n

B-3 M 6 3196 0.57<\/p>\n

V-1 M 12 3199 0.62<\/p>\n

V-2 M 12 2941 0.66<\/p>\n

V-7 M 5 2892 0.46<\/p>\n

C-1 M 8 2916 0.54<\/p>\n

C-2 M 8 2718 0.52<\/p>\n

C-3 M 8 3000 0.52<\/p>\n

B-2 A 6 3072 0.58<\/p>\n

V-3 A 12 3029 0.66<\/p>\n

V-4 A 12 2978 0.60<\/p>\n

B-1 H 6 3051 0.50<\/p>\n

B-4 H 6 3333 0.65<\/p>\n

V-5 H 3.5 3132 0.52<\/p>\n

V-6 H 3.5 2895 0.50<\/p>\n

V-8 H 5 2821 0.44<\/p>\n

H-1 H 3 2721 0.36<\/p>\n

H-2 H 3 2741 0.40<\/p>\n

*B: Ba V\u00ec, V: V\u0129nh Ph\u00fac, C: C\u1ea7u Hai, H: Ho\u00e0 B\u00ecnh<\/p>\n

**A: A.auriculiformis<\/em>, M: A.mangium<\/em>, H: A.hybrid<\/em><\/p>\n

III. K\u1ebft lu\u1eadn<\/p>\n

M\u1ed9t s\u1ed1 t\u00ednh ch\u1ea5t c\u1ee7a c\u00e2y g\u1ed7 r\u1eebng tr\u1ed3ng m\u1ecdc nhanh c\u1ee7a Vi\u1ec7t Nam\u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh th\u00f4ng qua ph\u01b0\u01a1ng ph\u00e1p khoan v\u00e0 s\u1eed d\u1ee5ng thi\u1ebft b\u1ecb truy\u1ec1n s\u00f3ng \u1ee9ng su\u1ea5t. B\u1eb1ng ph\u01b0\u01a1ng ph\u00e1p khoan \u0111\u00e3 x\u00e1c \u0111\u1ecbnh \u0111\u01b0\u1ee3c \u0111\u1ed9 \u1ea9m t\u01b0\u01a1i, kh\u1ed1i l\u01b0\u1ee3ng th\u1ec3 t\u00edch t\u1eeb v\u1ecf v\u00e0o t\u00e2m c\u1ee7a A.auriculiformis, A.mangium<\/em>, A.hybrid<\/em> \u1edf m\u1ed9t s\u1ed1 v\u00f9ng Ho\u00e0 B\u00ecnh, C\u1ea7u Hai, Ho\u00e0 B\u00ecnh, V\u0129nh Ph\u00fac. \u0110\u1ed9 tr\u00f2n th\u00e2n c\u00e2y c\u0169ng \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh, A.hybrid<\/em> c\u00f3 \u0111\u1ed9 tr\u00f2n th\u00e2n c\u00e2y n\u1eb1m trung gian gi\u1eefa A.auriculiformis<\/em>, A.mangium<\/em> nh\u01b0ng h\u01a1i ng\u1ea3 v\u1ec1 A.auriculiformis<\/em>. C\u00e1c s\u1ed1 li\u1ec7u thu \u0111\u01b0\u1ee3c trong \u0111\u1ee3t nghi\u00ean c\u1ee9u n\u00e0y kh\u00f4ng nh\u1eadn th\u1ea5y hi\u1ec7n t\u01b0\u1ee3ng r\u1ed7ng ru\u1ed9t c\u1ee7a A.mangium<\/em>. V\u1edbi thi\u1ebft b\u1ecb truy\u1ec1n s\u00f3ng \u1ee9ng su\u1ea5t c\u00f3 th\u1ec3 x\u00e1c \u0111\u1ecbnh \u0111\u01b0\u1ee3c kh\u1ed1i l\u01b0\u1ee3ng th\u1ec3 t\u00edch kh\u00f4 c\u1ee7a c\u00e2y g\u1ed7 \u1edf ph\u1ea7n ngo\u00e0i.<\/p>\n

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

1. Ito, S. (1998): Incidence and severity of heart rot damage in Acacia mangium plantations, In Proceedings of International Conference on Acacia species – Wood properties and utilisation, 72-79, March 16-18 1998, Penang, Malaysia.<\/p>\n

2.Kah, L. D.(1996): Studies on natural hybrids of Acacia mangium and A, auriculiformis in Vietnam. In Tree improvement for sustainable tropical forestry, Vol. 2 (Eds) Dieters, M. J. et al., QFRI-IUFRO Conference, Caloundra, Queensland, Australia, Oct. 27- Nov. 1 1996.<\/p>\n

3.Kah, L. D., Hai, N. D., and Vinh, H. Q. (1997): Clonal tests and propagation options for natural hybrids between Acacia mangium and A. auriculiformis. In Proceedings of Recent Development in Acacia planting, 203-210, (Eds) J. W. Turnbull et al., Oct. 27-30 1997, Hanoi, Vietnam.<\/p>\n

4.Yamamoto, K., Othman Sulaiman, Rokiah Hashim (1998): Wetwood of Acacia mangium in Malaysia, In Proceedings of International Conference on Acacia species – Wood properties and utilisation, 32-35, March 16-18 1998, Penang, Malaysia.<\/p>\n

Results of identifying some characteristics of fast – growing forest plantation wood in Viet Nam<\/strong><\/p>\n

Summary:<\/em><\/strong>The Forest Science Institute of Viet Nam and the Japan International Cooperation Agency (JICA) have jointly conducted a research to identify the wood characteristics of some forest plantation species with the use of increment borer and transmission meter.<\/p>\n

It has been determined through research moisture content of fresh wood, specific gravity of dry wood, roundness of tree stem and velocity of the stem.<\/p>\n

The research has been carried out at Ba Vi (Ha Tay province), Me Linh ( Vinh Phuc province), Cau Hai ( Phu Tho province) and the Hoa Binh township.<\/p>\n

Increment cores obtained in this study reveal no phenomenon of hollow heart of A. mangium<\/em> stem.<\/p>\n

——————<\/p>\n

(*): Vi\u1ec7n Nghi\u00ean c\u1ee9u c\u00e1c s\u1ea3n ph\u1ea9m L\u00e2m s\u1ea3n Nh\u1eadt B\u1ea3n.**************************************<\/p>\n","protected":false},"excerpt":{"rendered":"

Tài nguyên g\u1ed7 r\u1eebng tr\u1ed3ng ngày càng tr\u1edf nên quan tr\u1ecdng h\u01a1n do thi\u1ebfu tài nguyên g\u1ed7 r\u1eebng t\u1ef1 nhiên. H\u01a1n n\u1eefa, v\u1ea5n \u0111\u1ec1 qu\u1ea3n lý r\u1eebng b\u1ec1n v\u1eefng \u0111ã khi\u1ebfn vi\u1ec7c s\u1eed d\u1ee5ng các ngu\u1ed3n r\u1eebng t\u1ef1 nhiên trong th\u1ebf k\u1ef7 21 s\u1ebd tr\u1edf nên khó kh\u0103n h\u01a1n so v\u1edbi tr\u01b0\u1edbc \u0111ây, các lo\u1ea1i lâm s\u1ea3n ch\u1ec9 chi\u1ebfm \u0111\u01b0\u1ee3c \u01b0u th\u1ebf trên th\u1ecb tr\u01b0\u1eddng Qu\u1ed1c t\u1ebf n\u1ebfu \u0111\u01b0\u1ee3c c\u1ea5p ch\u1ee9ng ch\u1ec9 v\u1ec1 qu\u1ea3n lý b\u1ec1n v\u1eefng: ISO14001 ho\u1eb7c FSC (Forest Stewardship Council) (WWF 1997). <\/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\/8580"}],"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=8580"}],"version-history":[{"count":2,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/posts\/8580\/revisions"}],"predecessor-version":[{"id":19321,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/posts\/8580\/revisions\/19321"}],"wp:attachment":[{"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/media?parent=8580"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/categories?post=8580"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/tags?post=8580"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}