Tapchi sd 18. thang 6-2016. trudng Dai hgc Tay Nguyfin ISSN 1859-4fin P H A N T I C H , X E P N H O M K H O I L l T O N G T H £ T I C H G O ( W D ) V A X A Y D\J>iG M 6 I Q U A N H E G I U A W D V O I C A C N H A N T O D I E U T R A R l T N G L A M CO SCf JX(SC
T I N H C A R B O N C U A C A C L O A I C A Y C H U Y E U R U l N G K H O P N g u y i n Thj TinV Ngay nhan bar 25/5/2016: Ngay phan bifin thflng qua: 01/06/2016; Ngay duyet dang: 07/6/2016
T O M T A T
Bai bao trinh bay kfit qua nghien cim xac dinh khfli lirgng thfi tich gd (WD,g/cm^) cac loii chu yeu rirng khflp. kifim tra, xfip nhdm cac loai cd cimg WD va xac dinh mdi quan he giiia W D cac nhSn t^
difiu ira rimg Kfil qua nghien ciiu cho thiy gia tri WD ciia 12 loai chii yfiu ciia rung khdp bifin dpng tii 0,501 - 0,759g/cm^ chiing lo nang lyc tich liiy carbon kha ldn W D cac loai cay gfl ning khdp dugc x ^ thanh ba nhdm vdi gia tri binh quan la. 0,517; 0,620; 0,750 g/cm^ va khoang each giua cac nhdm 1^ Kd
= 0,076g/cm\ Mat khac, mdi quan he gnia WD theo DBH, H, CA chung cac loai cay rung khdp va theo loai dfiu cfl mdi quan hfi yfiu, nghia la thflng qua cac chi tifiu difiu tra nay chua thfi xac dinh dugc WD Do do de xac dinh WD cho cac loai cd thfi su dung gia t n W D binli quan cua tat ca cac loai va nfiu yeu cau chinh xac hon thi sir dung WD tmng binh cho nhdm loai. Sii- dung W D kfit hgp cac md hinh thfi tich (quan hfi vdi cac nhan td difiu tra) se cd dii co sd dfi chuyfin ddi tir thfi lich cay riing sang sinh khdi vi carbon lich luy.
Tir khda: Carbon, khoi luang the lich g I. M O DAU
Bien ddi khi hau va mdi quan he ciia nd vdi phal thai khi CO^ lir suy thoai va mk rimg la mdt van dc dang dugc quan tam ciia toan cau, Dfi giam phal thai ni suy thoai va mat rimg, Vifit Nam da tham gia cimg Lifin Hiep Quflc chuong trinh REDD+, n-ong dd can tinh toan duoc kha nang hip Ihu CO, dc lam co sd tinh toan phat thai va hdp thu carbon
Rimg_ khfip !a mflt kicu rimg thua, dac tnmg vdi da sfl cac loai cay thude ho Dku (Diplerocar- paceac), cfl la rdng va rung la trong miia khd. Su lan pha difin tich ning ndi chung va rimg khdp ndi nfing. khflng nhimg gay mil can bSng sinh thai ma cdn lam giam khd nang hip ihu CO^ va gian tifip lam tang Ihcm lucmg khi CO, phat ihai vao khi quyfin, lam cho bifin dfli khi hau loan cku lang nhanh. Vi vay, mdt irong nhirng each Ihiic quan ly ben vung loai rirng nay nhSm phal trifin kmh tfi, xa hoi vdi van dfi bdo ve moi trudng do la udc tinh duoc gia tn hap ihu CO, ciia loai rimg nay dfi tham gia chuong irinh REDD.
Trong (hue tfi xac dinh smh khfli, Iuong C lich luy tmc tifip ciia cay va lam phkn la vkn dfi rit khd khan va phiic tap Mat khac, carbon lich luy Iheo loai duoc phan anh thong qua WD Do do vkn dfi nghien ciiu duoc dai ra la, i) Xac dinh WD cac loai chu yfiu rimg khdp ,i) WD cd ihfi udc tfnh Jhong qua cac bicn difiu ira rdng cd thfi do dfim hay Idiong. tu dd Iam co sd lap mfl hinh udc tinh carbon ihco nhom WD clio
/ TliS. Klioa N6ng Ldi.
Tac gu, bt->i lie .Xguyl
^ac^oai cay rimg khflp
, lirng khdp, sinh khdi
2. N O I D U N G VA P H U ' O N G P H A P N G H I £ N ClTU
2.1. Npi dung nghiin cuu
- Xac dinh duac WD, nhdra W D cho cac loSi eay chii yfiu rimg khgp
^ - Xay dung mdi quan he giiia W D vdi nhin t^
difiu tra ning cd thfi do dfim,
- x a y dung rad hinh xac dinh thfi ti'ch cay ning thdng qua cac nhan Id difiu tra
2.2. Phu-ffngphdp nghiin ciru i. Phuffng phdp lugn
Kha nang tich luy carbon ciia cay rung ngoai viec phu thugc vao kich thude cay thi cdn ph\i thuoc vao dac difim sinh hpc loai, thfi hifin qua W D Do vay nghifin ciiu tich luy carbon theo WD la CO sd de udc ti'nh hSp thu CO^ theo loii.
Phuong phap nghien cim chii yfiu la nil miu thuc nghiem theo timg ddi tugng dfi xac dinh WD;
phan tich phuang sai mdt nhan tfl xem xet s\r sai khac dfi phan chia nhdm loai, lira ra each phan nhom tdi mi nhdl; irng dung phuong phap him da b^en dfi xay dyng cac md hinh WD theo cac nhin td difiu tra, thfi tich cay ning vdi cac bifin difiu tra ning, Su dung WD kfil hgp cac rad hinh thfi tich se dfi dang chuyfin ddi hi thfi tich cay rimg sang sinh khdi va carbon tich luy
iL Phumig phdp nghiin cam cu thi - Su dung phuang phap khoan tang tnrdng dfi thu thap m i u ciia cac loai mi thfi chu yfiu trong Nghiep. Tnrang Da, hoc Toy Nguyen
Th, r,nh. DT 01685S57887, Email-nguyentinh lyr@gmaU com.
Tap chi so 18, Ihang 6-2016, ttuimg Dai hpc Tay Nguyei
ISSN 1859^611
" m g khop (Tram k i l m lam s6 1, VQG Yok Don) D i t a b a cac chi tieu sinh tnrong ciia cay go.
Thu Ihap m i u va xac dmh W D cho hing loai cay go rimg khop Iheo phuong phap: Khoan cay theo hai huong Bac va Nam d l lly m i u va xac dinh WD: tai vj tri 1,3 m ciia eay rimg, sii dung khoan t t a g tmong d j khoan p h t o gd or ngoai vao tam cay theo hai huong d l lly m i u gO. M6i loai khoan khotag 10 eay rai 6 d p kinh: Duoi 10cm, 10- 2qcm, 20-30cm, 30- 40cm, 40-50em, am 50cm.
Tong epng 12 loai voi 120 cay, 240 m i u dieo hai huong bac, nam.
_ Do c h i t a dai L (mm), duong kmh D (mm) mSn go va can mau ciia hai hucing d l xac dinh khii lupng mau m (g). Do sau ciia mau khoan > 40mm, L thay d l i vao cac d p kmh ciia cay
V^=H,5i2:xLxl0'
4
^^ ™i™' V,™ xac dinh WD m i u tuai.
- X I I Iy va p h a n tich mau
Cac mau jay d hifin trumig dugc dem siy d lOS^c cho dfin khi m i u khd hoan loan, co khdi lugng khflng ddi (khoang 48 gid), can trong luong mau kho.
Tir day tinh dugc WD cua mau theo cdng thiic sau:
W d - 1 + S22- V Xep n h o m W D :
Trfin CO sd WD cac loai, xfip nhdm cac loai cd WD gan nhau va kifim tra su sai khac bing phan tich phucmg sai mdt nhan lfl.
_ + Neu khdng sai khac thi diing chung WD cho tat ca cac Ioai.
^ + Nfiu khac thi xfip nhdm WD cho cac loai cay go rimg Khdp:
T i a h W D t r u n g binh moi loai:
U-rf = i + -icd^traiininilliB, so cay cua loai dd Phan chia n h d m :
w d „ - wd so n h d m
wd^: Khoi luong the tich go tmng binh ciia loaj (g/cm'); K ^ : Khoang each khdi luona Ehfi tich eo giua cac nhdm (g/'cm'); w d ^ ; KJidi lugng thfi tich gfl ldn nhat trong cac ioai (g'cra'); wd^^-Khdi lugng thfi tich go nhd nhit trong cac loai (g/cm--)
P h i n tich phinrag sai mot nhan tfl (theo loai), nfiu cd su sai khac thi se chip nhan phan chia nhdra. Thu chia iam 2, 3, 4 nhdm dfi xem raiic dfl sai khac tir dd chgn ra cich phan nhdm lfli uu nhai.
Neu khdng cd su sai khac thi bit budc phai chia iai nhom cho den khi cd sy khac bifit,
^ - Thiet ke m o h m h gifra khfli IiroTig t h i tich go W D Vffi cac n h a n tfl difiu t r a r i m g
Md hinh dang tdng quat: yj = f(.xi) Trong dd: Yj: WD. V; Xi: Cac nhan id difiu tra rimg: DBH, H. CA,
Phuong phap tifip can dfi lua chgn bifin tham gia vao md hinh va ham dugc xay dimg nhu sau:
He so lucmg quan, quan he. .xdc dinh R'-Vk long quat thi ham tflt nhit khi R-dat max va tfln tai d miic sai P < 0.05.
Tieu chudn i kiem tra su ldn tai cua cdc tham s6 ciia mo hinhrVai gia thuyfii Ho: bi - 0, gia thuyfit bi bac bd khi P < 0,05; cd nghia la cac tham sd tdn t ^ va khac 0 rfl ret. Chi lifiu nay chi ap dung cho ham da bien.
3. K E T QUA VA T H A O LUAN
3.1. Phdn tich xip nhdm khoi lugng thi ti'ch go (WD, g/cm") cda lodi cay gS chu yiu rimg khop.
Dua vao W D ^ c u a c a c miu s i y tinh dugc W D trung bmh ciia loai. Ket qua thu dugc ciia cac loai difiu tra d bang 1.
^ B a n g 1. W D cua cac Ioai cay r u n g k h o p STT Ten loai W D
til^gTai ^^^^^
1 Bang lang di 0,759 10 2 Cachit 0,675 10 3 Cam Lifin 0,645 lo 4 C a m x e 0,728 10 5 Chifiu lieu den 0,662 10 6 Dau dflng 0,698 10 Gao Vang 0.578 10 8 Giang Huong 0.622 10 9 Sao den 0,637 10 10 Vimg 0,547 10 11 Thau tiu 0.501 lo 12 Lira-set 0.502 10
ciia cac
loai 0.630 120
WD cua cac ioai cay rimg khdp bifin ddng ni 0.501 - 0./59. cho Ihay da sd cac ioai cay rimg khop la gd kha ciing %di WO > 0.5 (gd ciing tmng binh). Khd! luong ihfi tich cang cao"ihi sir^ khdi 23
Tap chi sd 18. thang 6-2016. irudng Bai hoc TayNguyen ISSN 1859-4611 va carbon tich luy cang ldn khi cay cimg thfi tich,
difiu nay cho thay cac loai cay rimg khdp cd kha nang tich liiy carbon kha cao, cho dii hinh than cay la khflng ihang, pham chat xau ve hinh dang gd.
Bang 2. K i t q u a p h a n tich phirong sai 1 n h a n to W D theo l o i i
De xem xet sir khac nhau vfi W D giiia cac loii cay, tifin hanh phan lich phuong sai mpt nhfln ^ de danh gia sir khac biet W D ciia 10 loai. Kfit qua d bane 2.
Source of Variation SS Between Groups 526.8288778
df MS
I 526.8289 F 150836.5
P-value 1 0 6 7 E ^ 3
Fcrh 4.300949 Vdi F=150836,5 > ¥^^= 4.3009, cho thay d
cac loai khac nhau co su khac bifit rd ret ve WD, hay ndi khac su tich luy carbon thay ddi rd ret theo loai, vi vay cac md hinh chi lap dfi udc tinh carbon chung cac loai se cd sai sd ldn,
Tifin hanh xep nhdm WD ciia cac loai, chia WD ciia loai ra lam 3 nhdm, khoang each giira cac nhflm WD, kj = 0,076 g/cra\ kfit qua xfip nhdm WD Ihfi hifin d bang 3
Bang 3. Xep nhom WD cac Ioai cay rirng k h o p . Ten
nhom
1 Thau lau; Lim xet; Vimg Gao vang; Giang 2 Huong; Sao Den; C i m
Lifin
Chifiu heu der; Ca chit;
3 Dau ddng, Cam Xe;
Bang lang di
0,501; 0,502;
0,547 0,578, 0,622;
0,637; 0,645 0,662, 0,675, 0,698; 0,728;
0,759 Vdi F=28 916 > Fg„j= 4,256, cho thiy giua cac nhdm da co su khac biet ldn vfi WD, viec xfip thanh 3 nhdm dam bao su chinh xac hon khi dua vao WD dc phan nhdm cac loai cd ciing WD.
Trong thuc le cd ihfi don gian hem, mdi loai thuflc nhdm WD nao, cd ihfi sd dung gia tn binh quan WD ciia nhdm dd dfi xac dinh sinh khfli va carbon thdng qua cac md hinh. WD tmng binh cua 3 nhdm !oai cay dugc ihfi hifin d bang 4
Bang 4. WD binh quan cua 3 nhdm Ioai cay trong rimg khop STT
1 2 3 4 5
» d
Nhom 1 0,501 0,502 0,547
0.517 Nhom 2 0,578 0,622 0,637 0,645
0,621 Nhom 3
0,662 0,675 0,698 0,728 0,759 0,704
Tir W D , trong t n r a n g h g p chtra lap dugc m o h i n h u a c tinh sinh khdi v a carbon cho loai, thi CO th^ ling d u n g d e chuySn d6i tir ihh tich c a y s a n g sinh khoi va c a r b o n : Sinh kh6i (kg/
cay): A G B ( k g / c a y ) = W D * V (m^)* 10^
N h u vay chi cin difiu tra rimg thdng thudng nhu do dudng kinh, chifiu cao dfi xac djnh V, c6 thfi suy ra sinh khdi timg cay thdng qua WD. D^ng thdi nfiu chap nhtn dp lin cay khflng cao theo IPCC (2006) thi lugng C = 0,47*sinh khoi, tit day CO the udc tinh dugc lugng C trong cay va lirpng CO, tichluy-=3,67*C.
3.2. Md hinh quan hf giua WD vdi cdc chl tieu dieu tra cda cdc lodi uu thi trong rung Khpp.
Tir sd lieu ciia cac loai cay da do dfim cdc chi tifiu difiu tra, xac dinh WD, su dung cac him khde nhau de mfl phdng tuong quan WD theo DBH H CA
3 2. J. Mo hinh quan hi giira WD theo DBH. H. CA chung cdc lodi cdy rimg Khop
Tim kifim quan hfi giua WD vdi DBH, H, CA chung cho cdc loai uu thfi rimg khpp, nghTa li danh gia xem cd sy diay dfli W D theo dudng kinh, chieu cao va dien tich tan la ciia cay ning hay khflng. Sau khi thir nghiem nhifiu mfl hinh t o ^ khac nhau, kfit qua trinh bay d bang 5 vd hinh I cho ham cd R^ cao nhit.
Cac md hinh quan he giua WD theo DBH, H, CA chung loai cd he sd xac dinh rat thip cho tb^y giQa WD va DBH, H, CA cd mfli tuang quan h§
rat yfiu. Nghia la khong thfi xac djnh WD gidn ti^p thdng qua ba nhan td la DBH, H va CA chung cho cac loai.
Trong thuc tfi kho co thfi xac dinh WD ncil khdng liy raiu cay rimg va ti'nh WD, tuy nhien trong Ihir nghiem nay cho thiy chua thfi xac djnh WD ciia cac loai thflng qua gia Iri do dfim thflng thudng la DBH, H va CA. Difiu nay cd nghia WD neu xfip chung cac loai la chua phat hifin dugc sir thay ddi Iheo kich thude, difiu nay cd thfi giai thich do mfli loai cd WD khac nhau d timg eip DBH hoac H hoac CA va bifin ddng quanh gia tri trung binh WD ciia cac loai. Tir kfit qua nay c6 thfi W.
luan WD chung cac loai khflng cd quan h? r5 ring 24
Tap chi so 18, thapi; 6-2016, tmong Bai hpc Tay Nguyen
ISSN 1859^611
Mo hinh W D = f(DBH) WD = f(H) WD = f(CA) W D . f ( D B H , H )
WD=f(DBH,CA) WD = f(H,CA)
B i j g 5, Mo hinh tiromg q u a n theo D B H , H , CA c h u n g cac loai cay r i m g k h o p R' (%) F r Phirong trinh
log(WD) = .0.673212 + 0.0548473*log(DBH) log(WD) = .0.926755 + O.I57968*log(H) log(WD) = .0.574588 + 0,0240772'log(CA) log(WD) - .0.975949 - 0.00222765*DBH + O.I99796»log(H)
log(WD) = .0.686883 +0.0610097*log(DBH) -0,0001127I6«CA
log{WD) = -0,920908 + 0.164694'log(H) - 0,00414l39*sqif(CA)
120 120 120
1.7681 11368 1.2522
2.12 15 1 1.5
0.147 0.001 0.223 120 12,783 8.57 0.000
120 2,6381 1.59 0.209 120 11.892 7.9 0.000 WD=f(DBH H CA) ^°80VD) = -0.9285 - 0.03532*sqrtCDBH) +
0.2Q7008*log(H) + 0.0160347 *log(CA) (log: Logaru neper)
^°?. ^^^' ^ y^ ^^- ^ ° ^^y ° ^ " sir WD chung cac loai thi chi can Sli dung gia tri binh quan ma khflng can quan tam dfin kich thude cay
Ptatcfk - - ^ •
120 13.121 5.84 0.001
e giira WD theo DBH. H, CA 3.2.2. Mo hinh quan h
cua limg lodi.
6 cac loai khac nhau hinh thanh WD khac nhau, WD phan anh nang luc tfch liiy carbon ciia loai cay gfl khac nhau. Dfli vdi 12 loai chu yfiu trong rung Khflp cilng tifin hanh tira kifim mdi quan he giira WD theo DBH, H va CA cho timg loai Tuy nhifin nghifin cuu cd chu dich thir nghifim phuong phap va loai nghifin cuu trfin dfli nrgng miu nhd (10 cay/loai) nfin kfil luan budc diu dua ra quan hfi W D = f(DBH,H,CA) theo mdi loai la chua ro, the hifin % ciia R^ tir thip dfin qua thip va Rvalue
> 0,05. Ket qua tham dd mdi quan hfi WD vdi 2 va , 3 ^ ^ td cho rimg Ioai, kfit qua cac bang 6 7 8 9 -0.3 0.1 0 5 0.9 <= . . ,
Fredcted
Hinh I. M o hinh q u a n he W D =f(DBH, H, CA) chung cho cac loai
Bang 6, Mo hinh q u a n he W D » f(DBH,H) ciia 12 loai mi t h j trong rirng khop ' - " " „ Phirong t r i n h „ R , ,.^„, P , p Bang Lang Oi " " " ' " ^ " " ^ " 0 I4790l'log(DBH) - ^—^
' 0.138037«log(H)
Ca Chit l°g(Wr>) - -0.886084 + 0.206231 'logtDBH) - 0.00983494«H
c a m Lien '"gOVD) = -0,360877 - 0 000715557«DBH - 0.00451962«H
c a m x e I<'E(WD) = -0.3I300I +0,0224134«log(DBH)- 0.0O346637»H
Chieu Lieu WD - 0.91843 + 0.00771253«DBH - Ben O.I69159'log(H) DSu D6ng 1°S(WD) - -3.0951 + 1.47132«log(DBH) -
' 0,0974879«H
Gao Vane '°8(WD) = -0.574017 - 0.00287824»DBH + 1,15048'1/H
10 9.34884 0,36 0.7093 10 36 8587 2.04 0.2 10 4.02182 0.15 0 8662 10 6.33 0 24 0,7954 10 15 4709 0.64 0 5553 10 44 3153 2.79 0 1288 10 13 7956 0.56 0.5948
Tap chi so 18, thang 6-2016, tnrcmg Bai hoc Tay Nguyen ISSN 1859-4ti]l _ . . ,, WD = 0.0846136+ 0,0924027«sqrt(DBH)-f , „ „ „ , ,
Giang Huong , 2 6 7 1 9 » I , ( H ) H t y , Q 53 , 3 5 ( , , 3 ^ ^ , ., sqrt(WD) = 0 6 0 2 8 7 7 - 0 . 0 0 2 9 5 7 6 3 » D B H + , „ , ,
' - ™ ' = " 0})162568«H ' " 'S-^^O^ 2.02 0.2034
„ „ log(WD) = -0 5 9 2 3 - 6 . 8 3 6 5 5 « l / D B H +
S I O B ™ 8 . 2 1 0 7 7 « 1 , ' H ' ° ' " ° " " 3 0.5142 .rv.-- -r, log(WD) = -13676-i-0.295981*log(DBH)-
™ ' " ^ ' ' " 0.0386395«H ' » '^-3539 0,68 0,5353 , , , WD = 0.556863 - 0.000790587»DBH +
^ " " g 0 00100721'H 10 2.48425 0.09 0.9157
(log Logan, neper) ' Bang 7, Mo hinh quan he VM) - f(DBH,CA) cua 12 loai iru the trong r i m g khop
Loai PhuoTig trinh n R^ (%) F r P R5„„ I 3„„ A, WD = 1 35587 - 0,127888*log(DBH) -
Bang Lang Ol „ ( , 6 3 6 2 9 5 - 1 O E ( C A ) ' " '-54676 0,37 0,7039 Ci, CK, log(WD) = -0.736869 -I- 0 0770459«sqrt(DBH) -
' ^ ' ' ^ ' ' " 0,00182091«CA ' " 31.7887 1,63 0.2621 r i m T ien W D - O 713191 - 0.040501 l«log(DBH) +
' • ^ " " - ' ° ° 0.00199098«CA •» 23,5889 1.08 0.39 C a m x e WD = 0.718166 + 0 00194629*DBH-
0.00146017'CA •» l t . 9 3 0.61 0.5678 Chicu Lieu Ben l°8<WD> = -0-579831 - 0.00940945«log(DBH) + , „
t , n i e u u e u o e n o.0669183'log(CA) ' " 21.7646 0.97 0.4236 D i u D d n s '»g(WD) = - 0 . 6 7 6 7 3 6 - 0 100512»sqrt(DBH) +
^ 0.238586'log(CA) 1" 27.3933 1.32 0.3262 Gao Vane sqn(WD) = 0 873425 - 0.00393784«DBH -
0 573009* 1/(CA) l " 28.3183 1.38 0.3118 Oiang Huong WD = 0.481781 -1-0.00622861«DBH-t-
"* 0 0569353*1/CA ' 0 59.0759 5.05 0.0438 Lim Xet log(WD) = -0 556608 - 0 0113604«DBH +
0.00408547'CA 10 55 2534 20,23 0,0012 Sao Dcn * ' ' = '' ^35648 - 1 03223*1/DBH -t 1.17595*1/
CA 10 3.6381 0.55 0.5986 Thau Tin * ° = 0.359133 + 0 0361611*sqrt(DBH) -
0 01125*log(CA) 10 140659 0.57 0.5883 Vimg * D ' 0,309724 -1- 1 56298*1/DBH -1-
0.0518465'log(CA) 10 13.7066 0.56 0,5969 (log. Logaru neper)
_ g j : ; g J : M o J i i n h ^ a n he WD - f(H,CA) eua 12 loii u u th^ trong r i m g k h ^ p J ' ' " " ™ 8 ' ™ 1 ' n H ' ( % ) F r Bing Lang 61 * ° ° ' 57694 - 0 177953*log(H) -
0 0840953*log(CA) 10 11.4336 0.45 0.6538 Ca Chit losCWD) - -0 440104 - 0 0106343*H -t
0 0410547*sqrt(CA) 10 33.5671 1.77 0.239 t im Lien * ° = " ' 1 7 5 0 4 - O.I42266*log(H) +
0 00219622*CA 10 32.9059 1.72 0.2474
Tap chi so 18, thang 6-2016, tiubng Dai hoe Tay Nguyen
ISSN 1859-4611 Cam Xe
Chieu Lieu Den Dau Dong Gao Vang Giang Huong Lim xet Sao Den Thau Tau Vimg
W D = 0.797453 - 0.0113657*log(H) - 0.00607319*sqrt(CA)
log(WD) - -0.570162 - 0.0121652*H + 0.115557*log(CA)
log(WD) = 0.279397 - 0,412192*sqrt(H) + 0.37421*log(CA)
log(WD) = -0.709243 + 2.65105*1/H - 0.733286* l/CA
WD = 0.484599 -1- 0,169463*1/(H) + 0.0259932*sqrt(CA)
WD = 0.633745 - 0.06429l8*sqrt(H) + 0.00161278*CA
log(WD) =-1.04376-t 0 155681*log(H)-1- 2,385*1/CA
W D = 0.557272 - 0,313685* 1/H - 0,00521 l9*log(CA)
sqrt(WD) = 0,671934 + 0.117041*1/H + 0.016283'log(CA)
(log: Logard neper)
Bang 9, Mo hlnh quan he WD = f(DBH,H,CA) cua
0 9 74 0.38 0.6987 0 34 8807 1.87 0.2228 0 38.3751 2.18 0 1837 0 17.6456 0.75 0 5069 0 48 5234 3.3 0 0979 0 56 3898 4 53 0 0548 0 12 9931 0 52 0.6144 0 3.75083 0.14 0.8748 0 6 94932 0 26 0.7772
Phu-ong trinh
12 loai im thi trong rimg khop
Bang Lang 6i Ca Chit Cam Lien Cam xe Chieu heu den Dau Dong Gao Vang Giang Huong Lim Xet Sao Den Thau Tau Vimg
(log Logaril neper)
WD - 1.64662 - 0.0641393*log(DBH) - 0.150476*log(H) - 0.068874*log(CA) log(WD) = -0.7425 -t 0.143519*log(DBH) - 0.0124614*H-t 0.0189788*sqrt(CA) WD = 0.97525 - 0.000894513*DBH - 0.143675*log(H)-t 0.00237618*CA W D = 0.751115 + 0.00295854*DBH - 0.00253923'H - 0 00160407*CA log(WD) = -0.821975 i- 0.223953*log(DBH) - 0 0417085*H + 0.0738939*sqrt(CA) log(WD) - -2 0586 + 0.943619*log(DBH) - 0 0977592'H -1- 0.222731 *log(CA) WD = 0 751311 - 0.0384634*sqrl(DBH) -i- 0 630207*1/H - 0.84678* 1/(CA) W D = 0 . 6 7 6 6 5 1 -i-0.0117017*DBH- 0.114888*log(H) - 0 000895078*CA log(WD) = -0.693249 - 0 012056*DBH + 0.068179*log(H) + 0.00390368*CA sqit(WD) = 0.601666 - 0 00389436*DBH + 0,0128235*H+1.07368*1/CA log(WD) - -0 789323 -t 0 0154994*DBH - 0.0396807*H - 0.0000386796*CA sqrt(WD) = 0 954038 - 0.120525*log(DBH) + 0 00326948'H -i- 0.0241689'sqit(CAl
n R" (%) F r 10 11,8583 10 38 8392 10 37.7491 10 20.46
10 57.3853 10 51.0553 10 26.7855 10 71 2464 10 55 6927 10 23 8499 10 22 7988 10 34 4464
0.27 0.8457 1.27 0.3661 1.21 0.383 0.51 0 6872 2 69 0.1394 2.09 0 2035 0.73 0 5698 4 96 0.046 11 98 0 0061 0.63 0 6238 0.59 0,6434 1.05 0 4361
27
Tap chi sd 18. ihang 6-2016, Inrdng Dai hoc Tay Nguyen ISSN 1859-4611 Nhu vay trong mdi Ioai quan he giira WD vdi
cac kich thude cay nhu DBH. H. CA la chua ro, do vay cd the su dung WD tmng binh theo loai hoac theo nhdm Ioai dfi don gian hon.
3.3. Mo hinh tuang quan the tich cdy (V) v&i chieu cao (H), dudng kinh thdn cdy (DBH) va
dien tich ldn Id (CA).
Dua vao sd lieu do dem ngoai thuc dia, ISp cfc md hinh quan he giira V vdi cac nhan tfl difiu tra cay ca the DBH, H va CA. Cac md hinh hrong quan duoc the hien d bang 10
Bdng 10. Mo hinh tuang quan V vai DBH, H vd CA
Phtrong trinh n R^ (%)
V V V
v=
V-
v- v =
= f(DBH)
= f(H)
= f(CA) f(DBH,H)
f(DBH,CA) f(H,CA)
li:DBH,H,CA)
log(V) = -9.3781 -t 2.57196*log(DBH) log(V) = -7 72546 + 2.43694*log(H) log{V) = -4 11624 + 0 930705*log(CA) log(V) = -8.66125 + 2.04646*log(DBH) -t 0.0570018*H
log(V) = -9.41487 -f 2 58853*log(DBH) - 0,000303162*CA
log(V) = -8.24847 + 1 95158*log(H) -I- 0.571992*log(CA)
log(V) = -12,3001 +0,0409953*log(CA) -1- 2,9792 l*log(DBH-l-H)
120 93.3802 120 66,7378 120 44,9382 120 99.3421
120 93.5313 120 81 064
120 99.4937 1664.52 236.76 96,3 8833,97
845.86 250.43
11494,84 0 0 0 0 0
0 0 (log Logaril neper)
Kfil qua bang 10 cho thay tuong quan giiia thfi tich vdi 3 nhan tfl DBH, H, CA va vdi 2 nhan tfl DBH, H la rat chat the hifin d he sfl xac dinh R- cao (R= = 99,49%). Nhin chung khi dudng kinh.chifiu cao. difin tich lang Ifin thi thfi tich cung tang iheo, dac biei su gia tang nay thfi hifin dfiu nhau d cac cap kinh, tang manh d nhimg cay cd dudng kinh 1cm Phuong trinh tren la co sd dfi xac dinh gian tifip thfi lich dua vao DBH, H, CA ma khdng c i n chai ha Tuy nhicn dfi dcm gian cd ihfi sir dung mfl hinh mdt nhan Id la DBH, v i n cho dd lin cay kha cao vdi R= = 93,38%. Dfli ydi mfl hinh V vdi H, CA cd hfi sfl tuong quan thip, chung Id cac nhan td rifing le nay chua phan anh dugc diy dii Ihfi tich cay rimg
Ngoai ra cd the xac dmh gian lifip H qua DBH Iheo mfl hinh' Ln (H) = 0 872822 + 0,57I958*Ln(DBH), vdi R^ - 61,09%
TCr md hinh nay kfil hop vdi WD cho limg loai hoac nhdm loai xac dinh dugc sinh khdi, carbon cua cay ning Khop nhu sau
- Lap 6 m i u dieu tra loai, D B H , H (hoac gian ticp qua m o hinh).
- T u DBH, H, CA qua m o hinh V = f(DBH H,CA) hoac V = f(DBH, H) suy ra thfi tich n m g cay theo nhom loai.
- Tir W D trung binh theo n h o m loai va V cay irong nhom loai d o , suy d u a c s m h kh6i - cua cay iren mat d i t la A G B (kg/cay) = kho
W D * V ( m ' ) * 1 0 \
- T a p h g p cac cay trong 6 m i u , suy ra dupc tong sinh khoi p h i n t h u c v a t tren mat dit, tii d a y xac dinh C = 0 , 4 7 * A G B ( I P C C , 2006), va C O , h i p t h u = C * 3 , 6 7 .
4. K E T L U A N
- Xac djnh WD cac loii chu yeu rihig Kh§p, kiem tra, xep nhom cac Ioai cd ciing WD:
Xac dinh dugc WD ciia 12 loai chii yfiu cua rimg Khdp, bifin dflng tii 0,501 - 0,759g/cm'. GiS tri WD ciia cac loai cay rimg khop kha cao, chiing td nang luc tich luy carbon kha Idn.
WD cac loai cay gfl rimg Khdp du^rc xfip thanh ba nhom, khoang each giiia cac nhdra la 0.076g/
cm' Ba nhdm WD ning khdp cd gia tri binh quan la: 0,517; 0,620, 0,750 g/cm'.
Gia Iri WD duoc sii dung dfi chuyfin dfli lir thfi tich cay gfl sang sinh khdi thuan lgi thflng qua cdng thirc. Smh klidi (kg/cay) = WD*V (m')*10\
- Mo hinh quan hfi gifra WD vdi cac chl tieu dieu tra cua cac Ioai trong rimg kh^p;
Giira WD Iheo DBH, H, CA chung cac loai cay rimg Khdp va WD Iheo DBH, H, CA theo loai dfiu cd moi quan he yfiu. Do dd dfi xac dinh WD cho cac loai cd Ihfi su dung gia tri WD binh quan cua (at ca cac loai va nfiu yfiu cau chinh xac hon thi Sli dung WD (rung binh cho nhdm loai.
