Cdftg nghiip rdng
cm
MOT SO TINH CHAT V A T LY VA CO HOC CUA GO SA M O C DAU {CUNINGHAMIA KONISHII HAYATA) TAI TINH HA GIANG
H S N g o c Sffn', N g u y e n T h j TuySn^
'•^Trudng Dai hgc Nong ldm Thdi Nguyen T 6 M T A T
Sa moc diu (Cunninghamia konishii Hayata) la nguon gen qui hion du^c xep nhom IIa ciia nghi dinh 32/2006/ND-CP vl vific quan ly thirc v|t rimg, dong v^t rimg nguy cap, qm', hiem CJ muc d^ toan cau, Sa mgc dau duoc xip \ko nh6m sap bi tuyet chiing (VU Ale), Sa mQC dau kh&ig chi c6 y nghTa vl mat khoa hoc ma c6n c6 gia trj kinh te rit cao. G6 thugc nhom 1 theo phan ioai nhom go rimg Vi§t Nam. Tuy nhi€n, hi$n nay cac nghi&i Cliu chinh thiic ve co ly go Sa m§c dau rat han che. NghiSn cihi nay dirgrc th\rc hiSn nhim b^ sung tliem cic thnig tin ve tinh chat vat ly va ca h<>c cua go ph\ic v^ cho n g h i ^ ciru va sii dung go Sa mgc dau. Ket qua nghien curu cho thay ckc tinh diat vat ly v i co hoc ciia go Sa mgc d^u deu kha thap: dp bin udn linh (MOR) &k voi go gia 66,1 MPa, g6 non 47 - 48,2 MPa; Mo dun dan hoi go gia 5,1 GPa, go non 4,3 - 4,5 GPa; E>Q ben tadi doi vtii go gia 7,5 KJ/mm^ go non 6,5 - 6,7 KJ/mm^. Go co h? so co rut the tich thap do vety thu5n Igi cho qua trinh phoi siy va sii dung sau nay it bi nut, v&, G6 Sa moc dau p h i hop lam dfi thiJ cong, my ngh§. Go mem va nhe, van gd khdng r5 nhung mat gS min, khong khd khSn trong gia cdng chd bien, gd mau sang nin dl nhugm miu khi cin, Dac bi^t gd cd mui thorn nin rat thich hop d l trong nha, tao huong thorn tu nhien. Danh gi^ diung dio go Sa moc diu la go nhe, Idia nang chju l\ic Ididng cao, gd chi n&i sii dung trong nhOng ciu kien it doi hoi kha nang diiu luc va sii dipig tam didi.
Tix khoa: Co* hgc, Sa mdc d^u, tinh chit vat iy.
I. D^T VAN DE
Sa moc dau {Cunninghamia konishii Hayata) la loai cay co gia tri cao vk kinh te va bao ton nguon gen. Gd va tinh diu la hai san phdm quan trong ciia nguon gen Sa moc diu.
Go Sa mpe diu la lo^i b8n, it mdi mpt, co hoa van, mau sic rit dep v i rit dugc ua diing de lim cic do thii cong my nghe, lam cic vit dung trong gia dinh, lam nha. Sa moc diu li cay im tien trong chircmg trmh trong riing. Go thuOe nhom 1 theo phan loai nhom g6 rimg Viet Nam. G6 Sa mpe dau dugc dgo ggt thinh bon tim, giirang, gh£, die biet dugc chiet xuat thinh tinh diu hoa vao nirde tim hoac diing de uop xic. Nghien cuu, xic dinh tinh chat v§t 1^, CO hpc va thanh phan h6a hgc ciia g5 li m6t nhi?m vu quan trgng trong khoa hgc g5 noi rieng va trong nghien cuu dinh gia gia tri tii nguyen ciy gd noi chung. KSt qua xac dinh tinh chat vat ly, ea hgc vi thinh phin hoa hpe ciia go li ea sa khoa hpc rit ca ban vi quan trpng de tun hieu ve bin chat cua go, la cin cii de sii dung, che bi6n, bio quan g6 hgp ly v i hieu qua tii nguyen g6, la nh&ng tieu chi de danh gia chit lirgng rimg, danh gia tuy^n chgn
giong, nghien ciiu nhOng anh huang cua cac nhin to moi tnrcmg, bien phap kinh doanh.
Nhiem vu nghien cuu xac dinh tinh chit cua g6 phai la mgt boat ddng khoa hge thudng xuyen phuc vu cho nghien eihi, sin xuit trong moi thai ky.
Nhu vay, nghien cuu xac djnh tinh chat v^t ly, CO hgc va thinh phin hoa hgc cua gd va tre d nude ta cd mgt y ngMa to ldn, nhung k6t qua nghiSn ciiu tir trudc cho den nay con rat han chS c i ve sd lugng v i chit lugng, con qui ft so vdi tai nguyen rimg d nude ta, da khdng ddp ling dugc nhung nhu eiu, ddi hdi cua phat trien kmh te xa hpi d nude ta, dac biet trong su nghiSp cdng nghi?p hoa, hien dai hoa dat nude.
Tinh chit vat ly ciia gd la nhirng tinh chat c6 the xac dmh dugc trong di8u kien thi8t lap tuong ttr dieu kien sii dung ed the xiy ra troi^
thue te. Tinh chat vat ly bao gdm cic van de:
nude trong gd, sir co nit, sir giin nd, khoi lugng rieng, do hut am, dd hut nude.
Khi sir dimg go la vat lieu ky thuit can phai xac dinh khi nang go chdng lai tic ddng ngoai lire, dd chmh la tinh chit ca hpc. Khi gd chiu tie dgng cua ngo^i l\rc, nhfing tinh chit ca hpc 142 Ti^P CHi KHOA HQC VA C 6 N G N G H | LAM NGHlfP SO 1-2018
Cong nghiip rimg eua gd se xuit hien: dp ben ca hgc - khi nang
ciia gd ehdng lai su pha buy; bi6n daing eiia gd - kha nang go ehdng lai sir thay ddi kich thudc v i hinh dang; tmh chit cdng nghS v i sir dung.
Hieu biSt tinh chit co hpe cua go cd y nghia het siic quan trpng trong viec tinh toan dp ben ket cau gd. Xic dinh Iua chgn che do gia cdng, chd biSn v i sit dung gd hgp ly va la co sd cho viec dinh phim chit lugng, gii tri cua gd. Khi xac dinh cae thdng sd cdng nghe ciia qua trinh gia cdng ca hgc hole xu I;^ thiiy nhiet, tmh toan kdt ciu gd va cic trudng hgp khac cin thiet phii xic dinh khi nang chiu luc vi bien dang ciia go. Mdi loai gd cd nhimg dac diem cau tao v i tinh chit vit ly, co hgc va thanh phan hda hpc khac nhau, do dd khi hieu ro cac tinh chit cd the tuy theo yeu ciu cu the m i cd nhthig bien phap xii ly thich hgp giiip cho viec su d\mg go hi?u qui, lau ben.
Chinh vi ly do neu tren nghiSn ciiu nay nhim xac dinh duge mdt sd tinh chit vit ly, CO hgc ciia gd Sa mdc dau lam co sd cho che bien, bio quan va sii dung.
n . PHlTONG PHAP NGHIEN CUtJ 2.1. Vat lieu
Miu go thi nghiem dugc thu thip tai huyen Hoang Su Phi va huyen Vi Xuyen tmh H i Giang, mlu liy thi nghiem theo 2 cip tudi 10 tudi (gd non), 40 tudi (go gii). Qua trinh liy mau dugc thue hien theo tieu chuin TCVN 8044 :2009.
2.2. Phu-tfng phap nghien cihi
2.2.2. Xdc dfnh dp dm cho cdc phep thu ca ly Dugc thire hien theo tieu chuin: TCVN 8048-1: 2009. Gd - Phuong phap thu co ly - Phin I: Xac dinh do i m cho cic phep thii co Iy. Chuin bi miu thu l i hmh Iang tru diing cd Idch thudc canh m§t cit ngang 20 mm vi chieu dii dgc thd 25 ± 5 mm. Sau khi chuan bj, bio quan cac miu thii trong dieu kien dp im ciia miu thli khdng thay ddi.
Dp i m gd tinh theo cdng thiic:
Trong dd:
mi - khdi lugng ciia miu thii trudc khi Iam khd kiet;
m2 - khdi lugng miu thii sau khi lam khd kiet.
2.2.Z Xdc dinh lihdi lirgmg riing
E)ugc thirc hien theo tieu ehuin: TCVN 8048-2: 2009. Gd - Phuang phip thii co ly - Phin 2: Xac dinh khdi lugng rieng cho cac phep thli CO ly. Khdi lugng rieng dugc tinh theo cdng thiic:
• a^J}J„ V„
Trong do:
mw - khdi lugng miu tai dp im w (g);
aw,bw,Iw - cic kich thudc cua miu tai do im w(mm);
Vw - the tich mau tgi do im w.
2.2.3. Xdc dinh dp co rut theo phuffng xuyen tdm vd tiep tuyin
Dugc thyc hien theo tieu chuin: TCVN 8048-13: 2009. Gd - Phuong phap thii ca ly - Phin 13: Xac dinh dp co nit theo phuong xuyen tim v i phuong tiep tuyen.
a. Tinh tdng dp co nit tuyen tmh + Ddi vdi phuong xuyen tim:
/.„ -.100
• Ddi vdi phuang tiep tuyen:
/,„ -.100 Trong dd:
Ir max v i It man - ki'ch thudc mlu thu tai do am ldn hon do im tai diem bio hda theo cac phuong (mm);
Ir mm vi It mm - ki'ch thudc Ciia mau sau khi da lam khd (mm).
b. Tmh dg co nit tuyen tinh khi dp i m dat cin bing vai mdi trudng tu nhien
+ Ddi vdi phuong xuyen tam:
. / ™ -ir hr.
-.100
1/1/
D d i v d i p h u o n g tiep t u y e n :
„ A™, -I, , « «
T ^ C H i K H O A H Q C V A C 6 N G N G H E L A M N G H I E P S O 1-2018
Cdng nghi$p riing Trong dd:
If va It - kich thudc mlu thir tai'dd am cin bang vdi dd i m tu nhien theo cac phuong (mm).
2.2.4. Xdc dinh dp co rdt thi tich
Dugc thue hien theo tieu chuin: TCVN 8048-14: 2009. Gd - Phuang phap thii co ly - Phan 14: Xic djnh dp co nit the tich. Ti6n hanh ngim mlu thu trong nude cit trong binh d nhi?t dp 20 ± S^C cho den khi khdng thay ddi kich thudc niia. Kiem tra su thay ddi kich thude 3 ngay 1 lan bang cich do lai 2 hoae 3 mlu thli theo cac phuang thich hpp. Ngung viec ngim khi chenh 16ch giiia hai lan do lien tiep khdng vugt qui 0,02 mm. Do cac kich thudc mat cit ngang ciia mdi mau thii chfnh xae den 0,01 mm d tnmg diem be mat xuyen tim vi h& mat tiSp tuydn ciia miu. Ti6p theo, dn dinh mlu thii d8n dp Im can bing vdi mdi trudng ty nhien (im tuong ddi 65 ± 5%, nhiSt dp 20 ± 2''C sao cho bi£n dang kich thudc v i hinh dang khdng xuat hien. Kiem tra su thay ddi ve kich thudc ciia 2 hoac 3 mau thii kiem soat bing each do lai. Ngimg dn dinh khi dp chSnh lech giiia 2 Ian do lien tiep khdng vugt qua 0,02 mm. Do cac kich thudc mat cat ngang ciia mdi miu thii. Say mau den khd kiet trong tu siy d nhiet do 103 ± 2''C. Lam ngudi miu trong binh hiit im rdi do kich thudc miu thir nhu tren.
2.2.5. Xdc dinh dp ddn net
Ehigc thue hien theo tieu chuin: TCVN 8048-15:2009. Go - Phuong phip thu co ly - Phin 15: Xic dinh do giin nd theo phuong xuyen tam va phuong ti6p tuyen.
Tinh tong gian nd tuyen tinh:
a. E)di vdi hudng xuydn tam:
b. Ddi vdi hudng tiep tuyen:
-.100
Trong do;
Ir max v i \ max - kich thudc mlu thu tai do am
ldn hon do im tz\ diem bio hda theo cat phuong (mm);
Ir mm v i It mm - ki'ch thudc cua mlu sau khi siy (mm).
+ Tinh dg co nit tuydn tmh khi dp im dat can bing vdi mdi trudng tu nhifin:
a. Ddi vdi hudng xuyen tim ir. .100 b. Doi vdi hudng tidp tuydn:
i,^ -i.
An, -.100 Trong do:
Ir va It - kich thudc mau thii t^i d^ im can bing vdi do im t\f nhien theo cac phucmg (mm);
Irmin, Itmin " la kich thudc Ciia mau thli, ti'nh theo mm.
Bieu thi ket qui chinh xic ddn 0,1%.
2.2.6. Xdc dinh dp ben uon tinh
Dugc thue hien theo tieu chuin: TCVN 8048-3:2009. Gd - Phuang phap thii ca ly - Phin 3: Xic dinh do bdn udn tinh.
a. Dd ben udn tmh d dp am w tinh bing MPa:
"'- 2bh' Trong do:
Pmax - tii trpng pha hiiy mau thii (N);
1 - khoang cich giua tim cac gdi dd (mm);
b - be ngang ciia mau thii (mm);
h — chieu cao ciia mau thir (mm).
b. Khi cin phii hieu ehinh dp ben udn tmh cua mlu thu d dp i m w vd dd Im 12%, ap dpg cdng thiic sau:
^M2=o-Mr[l + «(»'-12)]
Trong dd:
a - he sd hieu chinh do am. xac djnh tren co sd thirc nghidm. Khi khdng cd quy dmh rieng thi liy bing 0,02;
w - dp am cua gd tmh theo TCVN 8048-1 (ISO 3130).
2.2.7. Xdc dink mo dun ddn hoi fchi uon tinh Dugc thyc hien theo tieu chuin: TCVN 8048-4:2009. Gd - Phuang phap thii co ly - TAP CHi KHOA HQC VA CONG NGHE LAM NGHIfP SO 1-2018
Cdng nghiip riimg Phin 4: Xic dinh mddun din h^i khi udn tmh.
+ Md dun din hdi tai do Im w
-Khi khoang each truyen tii bing 1/3 khoing each cac gdi do:
36.bJi\f
- Khi khoang cich giiia cae gdi do bing Y2 khoang cich cic gdi dd:
E =-2l^
" 64J>Ji\f Trong dd:
P - t i i t r p n g (N);
1 - khoing each giira tim cac gdi da (cm);
b, h - cic kich thudc mat cit ngang tuang ling theo phuang xuyen tim va tiep tuydn (mm);
f- bien dang trong dien tich udn thyc (mm).
Bang 1. T^Dg hg^p ket qua xic dinh
-*• Khi cin phii hi?u chinh vd dd am 12%, ap dung cdng thiic:
E =
E:^—
'^ l - a ( M - 1 2 ) Trong do: a - li he sd hieu ehinh. Khi khong cd quy djnh rieng liy bing 0,25.
Tieu chi phin nhdm go ip dung theo phin loai ciia Nguyen Dmh Hung (1995). Cac thidt bi phin tich bao gdm may thii siic bdn vat li?u da nang INSTRON 5569, tii trgng tdi da: 50 kN (tuong duong 5000 kgf). Cin phin tich tii trpng tdi da 300g va do dpc chinh xac 1/lOOOg.
Thudc kep do dge chinh xic 1/IOmm, tii siy v i cic thiet bi, dyng cu thi nghiem khic.
IH. KET QUA VA THAO LUAN Ket qui thi nghidm tinh ehit vit ly, co hpc ciia gd Sa mdc diu dugc tdng hgp d bang 1.
vat If, cor hoc ciia go Sa mdc diu TT
So Bon v| liTQUg
ti'nh mau TN
MSU Mau gS M I U gS g5 non DOO gii khuc 1 khuc 2 A V?tly
1 Khdi lugng rigng (12%) 2 Do gian nd hudng xuyen tim
Dp gian nd hudng tiep tuyen Dd gian nd th^ tich
T Dp gian nd tuyen tfnh ddi vdi hudng xuyen tam
Dp gian nd tuyen tinh doi vdi hudng tuyen tuyen
Dp gian nd the tich
. DO CO rut tuyen tinh doi vdi hudng xuyen
^ tim
Dp CO nit tuyen tinh ddi vdi hudng tiep tuyen
Dp CO rut the tich
Dd CO rut tuyen tinh ddi vdi hudng xuyfin tim
Dp CO rut tuyen tinh doi vdi hudng tuyen tuyen
Dp CO rut th^ tfch
6 He so CO nit dof vdi hudng xuyen tam He so CO nit doi vdi hudng tuyin tuyin He so CO rut the tfch
B Cff hge ] Dp ben u6n tihh 3 Dp bSn tich
4 Md dun dan hoi khi udn tinh
g/cm' 45 0,49 0,37 0,37
% 45 3,73 3,79 3,83
% 45 3,21 3,28 3,13
% 45 7,32 7,47 7,35
%
45 2,66 1,94 1,925
%
%
%
%
%
%
%
%
45 45 45 45 45 45 45 45
3,04 5,97 3,73 3,21 7,32 2,66 3,04 5,97
2,28 4,44 3,79 3,28 7,47 1,94 2,28 4,44
2,28 4,42 3,83 3,13 7,35 1,92 2,28 4,42 45 0,26 0,29 0,28 45 0,09 0,11 0,09 45 0,37 0,42 0,39 MPa 30 66,1 47,0 48,2 kJ/mm' 43 7,5 6,5 6,7 GPa 30 5,1 4,5 4,3 T ^ P CHi KHOA HQC VA C 6 N G NGHE L A M N G H I J P SO 1-2018
Cong nghiep riimg
Cac thi nghidm dugc tidn hinh theo tieu ehuin hi^n hinh, sd lugng miu thi nghidm dii ldn theo ydu ciu, dim bao dp chinh xac > 95%
(sai sd < 5%), he sd bien ddng (v) nhd < 15%, dip ling dugc cic yeu cau vd thi nghidm tinh chit vat ly, co hpc eiia gd. Sd lieu thi nghiem dim bio do chinh xic v i ding tin ciy.
Qua bang 1 ta thay:
+ Ve khdi lugng rieng phan gd gii cd khdi Bang 2. Ket qui phin Ioai tfnh chat
lugng rieng cao han 2 phin gd non (0,49 g/cm ). Hai phaii gd non cd khoi lugng riSng bing nhau v i rit thip (0,37 g/cm^);
-1- Vd dd CO nit, din nd thi ci 3 phin gd gja, go non 1, go non 2 khdng cd su sai khic. Nhin chung cd dg co nit, dan nd thip.
Ket qui phin loai cae tmh chit vat Iy, co hijc ciia gd Sa mgc diu dugc thd hien trong bang 2.
v^t 1;^, CO* hgc cua go Sa mdc dau T T
A 1 2
3
B I 2 3 C 1 2
Tinh ch^t V j t l y
Khoi luong riSng (12%)
DO CO rut tuyen tinh doi voi hudng xuyen tam E)Q CO nit tuyin tinh d6i voi
BQ CO rut the tich Dg CO rtit tuyen tinh d6i voi Do CO rut tuyen tinh doi voi Dp CO rut the tich CvhQC Uon tihh tiep tuyen Md dun dan hdi D Q b i n tach D a n h gia theo tieu chuan T C V N 1072-71 Theo Khdi \ltqng rieng Theo do ben khi uon tinh
hudng tiep tuyen
hudng xuyen tam hudng tuyen tuyen
D o n v } ti'nh
g/cm^
%
%
%
%
%
%
M P a GPa kJ/mm'
g/cm^
M P a gia
0,49 3,73 3,21 7,32 2,66 3,04 5,97
66,1 5,1 7,5
0,49 66,1
GS Don k h f i c l
0,37 3,79 3,28 7,47 1,94 2,28 4,44
47,0 4,5 6,5
0,37 47,0
G3 non khuc 2
0,37 3,83 3,13 7,35 1,92 2,28 4,42
48,2 4,3 6,7
0,37 48,2
Sanh gij
RStthip ThSp Thap Thip Thip Thap Thip
Thip Rit thip
Thip
Nhom VI Nhom VI Can cii vio bing danh gia tinh ehat vit ly,
CO hgc ciia gd d bing 2 thiy ring c i 3 phin gd gii, go non khiie 1 v i gd non khiic 2 ciia gd Sa mpe diu ddu cd khdi lugng ridng thip. Do co nit, din nd thap. Kha nang chiu luc thap, chiu dan hdi kem.
Theo dinh gia cho gd diing trong xiy dung va giao thdng van tai, gd Sa mpe diu duge xdp nhdm VI cin cii trdn khdi lugng rieng, kha
ning chiu udn tmh.
Danh gii ehung cho ^ Sa mdc diu la go die, khi ning chiu krc khong cao, gd chi nen su dung trong nhiing ciu kien it doi hdi khi nang ehiu ]\fQ vi su dung t^m thdi
Ddnh gid khd ndng su dung go ldm do moc Gd de sin xuat do moc phu thudc rat nhieu thj hieu v i thi trudng, vd co bin gd dugc danh gia theo nhirng tidu chi chung.
T ^ P c m KHOA HOC VA CONG NGHE LAM NGHIEP SO 1-2018
Bang 3. Danh gia go Sa moc diu theo mot so chi tieu lim do mdc
Cdng nghiep rimg
S^c diem Dp b8n tir nhien (nam) Van go
MatgS
Khdi lugng riSng (g/cm^) Kha nang chl bi^n He so CO nit thd tich Udn tinh (MPa) Mau sac
Gia trj Nhdm
>7 Trung binh
Min 0,49 D l 0,37
66
Cin cii vao danh gia cac chi tieu d bing 3, Gd Sa mdc diu dugc xdp hang II, nhom go ft phii hgp lim dd mdc, dac bidt dd mdc cao cip dii gd cd do bdn tu nhien eao, mat go min, nhung van gd it, khdng ro dep de lim dd mgc ngoai ra go mem vi nh? ciing l i yeu to khdng phu hgp cho lam dd mge ndi ehung v i bin ghe ndi ridng. Gd cd he sd co rut the tfch thip la
thuan lgi cho qua trinh phoi say va sii dung sau niy it bi nut, v5.
Ddnh gid khd nang sti dung go ldm do thu cong, my nghi
Gd de sin xuit dd thii cdng, my nghe phu thudc rit nhidu thi hidu va thi trudng, ve co ban gd dugc dinh gia theo nhirng tidu chi chung nhu trong bang 4.
Bang 4. Panh gia go Sa mdc dau theo mot so chi tieu lim do thu c6Dg, raf nghg Nb6iii
Dac diem Gia t r i
Van go Matgd
Khdi lugng rieng (g/cm^) Kha nang che bien Kha nang gia cdng be mat Mau sac
Trung binh Min 0,49 Dl Dl sang Can cii vio dinh gii cac chi tidu d bing 4,
Gd Sa mdc diu xep h^ng I, nhdm gd phii hgp lim dd thli cdng, my nghd. Gd mem va nh?, van go khdng ro nhung mat gd min, khdng khd khin trong gia cdng che bien, gd miu sing nen dl nhudm mau khi cin. Die bi?t gd ed miii thom nen rit thich hgp dd trong nhi, tao huong thom tu nhien. Gd ngoii ra ft bi co rut, dan nd nen cac do thu cdng my nghe sau khi tao ra eung it bi nut, vd.
IV. KIET LUAN
Cac tfnh chit vat ly va co hge ciia gd Sa mdc diu deu khi thap. Gd cd hd sd co nit the tich thip li thuan lgi cho qui trinh phoi say v i su dyng sau niy it bi nut, vd. Can cii vio danh gia cac chi tidu d bing 4, Go Sa mdc diu xep TAP CHI KHOA HOC VA C 6 N G
hang I, nhdm gd phii hgp iam dd thii cdng, my nghe. Gd mdm v i nhe, vin gd khdng rd nhung mat gd min, khdng khd khan trong gia cdng che bidn, gd miu sang nen dd nhugm mau khi cin. Die biet gd cd miii thom ndn rat thich hgp dd trong nha, t?io huong thom ty nhien. Go ngoii ra it bi co nit, din nd nen cic dd thu cdng my ngh? sau khi tao ra cimg it bi niit, vo.
Theo dinh gii cho go diing trong xiy chmg v i giao thdng v^n tai, gd Sa mOc dau dugc xep nhom VI can cii tren khdi lugng rieng, khi ning chiu udn tinh. Danh gia chung cho go Sa mdc dau la gd nhe, kha nang chiu lye khdng cao, gd chi nen sii dung trong nhtrng cau kien it doi hdi khi nang chiu luc vi su dyng tam thdi.
NGHE LAM NGHIEP SO 1-2018 147
Cong nghiip rirng
T A I L I E U T H A M K H A O '*• Nguyen Dmh Himg (1990). Nghien cuu nlnng 1. Nguyen Dinh Himg (1995). Ket qud nghien cuu "'"'' ^^^' '^° ^^" ™ ^ ' ^ ^?«'' /"^^g su dyng nguSn ik- nhirng tinh chdt ca bdn cua mpt sS cdy gd rimg Viet "S^ye" SO rimg Vi4tNam. Bao cao khoa h(jc cong ngh?
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SOME PHYSICAL CHARACTERISTICS OF CUNINGHAMIA KONISHII HAYATA WOOD GROWN IN HA GIANG PROVINCE
H o N g o c S o n , N g u y e n Thi Tuyen Thai Nguyen University of Agriculture and Forestry
S U M M A R Y
Cunninghamia konishii Hayata is a valuable genetic resource classified in group IIa under the Degree 32/2006/ND-CP about management of endangered plants and animals. At global scale, Cunninghamia koniski Hayata is considered as vulnerable (VU Ale). Cunninghamia konishii Hayata wood also has high economic value. However, there is a lack of information about this wood. This s t u ^ aims at providing fiirther information of physical characteristics for better study and use purposes. Study results show that physical properties of Sa moc dau wood are quite low: MOR of old wood 66,1 MPa, young wood 47 - 48.2 MF^ MOE of old wood 5.1 GPa, young wood 4.3 -4.5 GPa; separation straigth of old wood 7,5 KJ/mm^ young wood 6.5 - 6.7 KJ/mm^, The volumetric shrinkage of the wood is low which is good for drying and using, Cunninghamia konishii Ifayata wood is suitable for making fiimiture. It is quite soft and light, has smooth surface and thus is easy far ^ocessing. Wood is bright thus easy for coloring. Wood has natural fragrant smell which is suitable fw indoor furniture. In general, Cunninghamia konishii Hayata is light wood, stands low bearing force which is only suitable for work with low carrying power.
Keywords: Cunninghamia konishii ^ y a t a , physical properties, strength.
N g i y nhan bai N g i y phan bien N g i y qoyet dinh dang
05/10/2017 04/12/2017 11/12/2017
T ^ CHI KHOA HQC VA CONG NGH$ L A M NGHI?P SO 1-2018
