thiết lập mô hình ước tính sinh khối và carbon của cây rừng lá rộng thường xanh vùng tây nguyên việt nam

1            CÂY  ,     t mô hình    vùng Tây Nguyên  tham gia  + ). Nghiên c(2000m 2 /ô )    thi  DBH)H) WD)thêm Ca)  Brown (2001) 107% 94% khi        cho   sinh t(allometric equat,   1 M carbon 2   trong            +         ()           2                  (allometric equations) - 2001), MacDicken (1997), Chave  (2004, 2005), Pearson (2007), Basuki  (2009), Henry  (2010), Dietz  (2011), Johannes  a  (Carbon Fraction)  (2006). 2 Trong khuôn kh 2010 - 2012,  CO 2       . 2  2.1  2.1.1     2.1.2 u -  -  2.1.3   i)    ; iii)   - 20%, pH =  .  36 0                     83%. 2.2  Ô (ICRAF, 2007).   100m,   2  (destructrue measurement) i 10cm   T   cây. 3          tiêu  - DBH), H),  -  (A) (L). -  .  -  i)     l       4      n cây  2.3    -   105 o   -  phân tích                   2 Cr 2 O 7 (Kali  màu xanh  3+  2 Cr 2 O 7   CO 2 CO 2 = 3.67C.     0 C    2.4 trong si Ca (m 2  2   (WD, g/cm 3 ) (V(cm 3  3  5 khô m(g),  3 ),   cây  2.5     .      Marquardt.                Statgraphics Centurion.     -  2 : 2   2   -    - - Correction factor): CF = exp(RSE 2 /2), CF  RSE (Residual standard error)    -                     p nh -   AIC (Akaike Information Criterion):          AIC   AIC = n*ln(RSS/n) + 2K = - ln(L) + 2K     (Chave et al., 2005). - S%) : 6 S% cho  Mt bin Tuyn nh  Phi tuyn n Tuyn nh  Phi tuyn Mt bin - n Bin y c i bin c nhau: ln(y), sqrt(y), R2 max, P < 0.05 Bi vi P < 0.05 CF >> 1 i s Cp >> p (sô bin s) S% min Bi # 0 Quan hcht nht Mô nh sai s n sbin s t n sbin s m t Sai sgia c lng quan t nht  3  3.1    sinh    trong b   2  DBH (cm) Cst (kg/cây) C(BGB) (kg/cây) Cbr (kg/cây) Cl (kg/cây) Cba (kg/cây)  (kg/cây)  2 (kg/cây) 5 2.0 0.4 0.4 0.1 0.2 3.0 11.0 15 29.2 5.1 6.9 2.5 2.9 46.6 170.9 25 101.8 17.6 26.0 5.0 10.5 160.9 590.4 35 231.6 39.8 62.5 6.7 24.7 365.3 1,340.6 45 428.2 73.1 120.3 7.8 46.8 676.2 2,481.5 7 DBH (cm) Cst (kg/cây) C(BGB) (kg/cây) Cbr (kg/cây) Cl (kg/cây) Cba (kg/cây)  (kg/cây)  2 (kg/cây) 55 699.3 118.8 202.9 8.7 77.8 1,107.5 4,064.5 65 1,051.9 178.0 313.6 9.3 118.9 1,671.7 6,135.3 75 1,492.5 251.7 455.3 9.9 170.9 2,380.2 8,735.3    2    3.2 AGB)    V    AGB).  St t   R 2 adjusted (%) P n Pbi CF AIC S% 1 AGB = f(DBH) AGB_kg = exp(-2.23927 + 2.49596*log(DBH_cm)) 95.721 0.000 161 0.000 1.06 -345.805 27.88% 2 AGB = f(DBH, H, WD) log(AGB_kg) = -2.74348 + 0.693879*log(H_m*DBH_ cm^2) + 0.367445*log(WD_g_cm3* DBH_cm^2) 97.481 0.000 161 0.000 1.03 -430.129 20.34% 3 AGB = f(DBH, H) log(AGB_kg) = -2.9766 + 0.535797*log(DBH_cm) + 0.759321*log(H_m*DBH_ cm^2) 96.804 0.000 161 0.046 1.04 -391.793 23.46% 8 St t   R 2 adjusted (%) P n Pbi CF AIC S% 4 AGB = f(DBH, WD) log(AGB_kg) = -2.05364 + 1.76966*log(DBH_cm) + 0.376371*log(WD_g_cm3* DBH_cm^2) 96.313 0.000 161 0.000 1.05 -368.791 24.76%                c nhau.      2      --    Plot of Fitted Model AGB_kg = exp(-2.23927 + 2.49596*ln(DBH_cm)) 0 10 20 30 40 50 60 DBH_cm 0 400 800 1200 1600 2000 2400 AGB_kg AGB = f(DBH Plot of log(AGB_kg) 0 2 4 6 8 predicted 0 2 4 6 8 observed AGB = f(DBH, H, WD)      -  : AGB (kg/cây) = exp(- 2.134 + 2.530 *ln(DBH)), DBH=5-148cm, n=170 cây, R 2 =0.97,    AGB_kg = exp(-2.23927 + 2.49596*ln(DBH_cm)), DBH=575cm, n=161, R 2 =0.95 -  9    log(AGB_kg) = -2.74348 + 0.693879*log(H_m*DBH_cm^2) + 0.367445*log(WD_g_cm3*DBH_cm^2)  -    -     .        2        log(AGB_kg) = -2.13408 + 1.96454*log(DBH_cm) + 0.619246*log(H_m) + 0.124205*log(Ca_m2) + 1.03509*log(WD_g_cm3)  2 - (log: logarit nepert) 10 Plot of log(AGB_kg) 0 2 4 6 8 predicted 0 2 4 6 8 observed Residual Plot 0 2 4 6 8 predicted log(AGB_kg) -2.6 -1.6 -0.6 0.4 1.4 2.4 3.4 Studentized residual  g(H), log(Ca), log(WD))   2       3.3 MC(AGB) H   , 3.  St t   R 2 adjusted (%) P n Pbi CF AIC S% 1 C(AGB) = f(DBH) C_AGB__kg = exp(- 2.97775 + 2.49711*ln(DBH_cm)) 95.398 0.000 93 0.000 1.07 -186.7 30.8% 2 C(AGB) = f(DBH, H, WD) log(C_AGB__kg) = - 3.40031 - 0.819475*log(DBH_cm) + 0.787115*log(H_m*DBH_ cm^2) + 0.673237*log(WD_g_cm3* DBH_cm^2) 98.459 0.000 93 0.006 1.02 -286.5 16.4% 3 C(AGB) = f(DBH, H) log(C_AGB__kg) = - 3.72664 + 2.05141*log(DBH_cm) + 0.760168*log(H_m) 96.280 0.000 93 0.000 1.05 -205.5 27.1% 4 C(AGB) = f(DBH, WD) log(C_AGB__kg) = - 2.63037 + 1.23621*log(DBH_cm) + 0.662748*log(WD_g_cm3* DBH_cm^2) 97.477 0.000 93 0.000 1.04 -241.6 21.6% [...]... ợ t ết lập ậ ả ả -REDD l ợ ậ I t ự 13 REDD l ợ p ếp t ii) t t ả t i t p p p p t t t t t ợ ì t n ết ả t t t t l t ả ợ T t ă –2 ự ựt ả ết ả ả l t ếH G tì ả l D ả t t pt t t pt 2 p tt ả t l ợ t ả t ự t t t l ợ t t t FRE p t l l t t t t ả t t H H H ì ả Title: Development of allometric equations to estimate biomass and carbon for the Ever-green broad leaved forest in the Central Highlands of Vietnam Summary... Vietnam Summary This research aims to develop allometric equations for estimating biomass and carbon sequestrated from different parts of forest tree such as stem, branch, bark, leave, and root of the ever-green broad leaved forest in the Central Highlands of Vietnam It is basis for measuring and monitoring carbon pools of above and below ground to join the REDD+ (Reducing emissions from degraded and... and WD with S% = 33.8% and for carbon in BGB (C(BGB) with three variables of DBH, H and WD with S% = 46.6% The high average deviation of BGB, C(BGB) models showed differences of the root biomass of tropical forest species Key word: Allometric equation, above ground biomass, below ground biomass, forest carbon, ever-green broad leaved forest, the Central Highlands of Vietnam 1 2 Basuki, T.M., Van Lake,... 0.693879*log(H_m*DBH_cm^2) + 0.367445*log(WD_g_cm3*DBH_cm^2) AGB_kg = exp( -2.9766 + 0.535797*log(DBH_cm) + 0.759321*log(H_m*DBH_cm^2)) AGB_kg = exp(-2.23927 + 2.49596*ln(DBH_cm)) ổ ợ ế ll ì l t t t ậ l t tt t l ợ lập t G t t t lập H log(AGB_kg) = -2.13408 + 1.96454*log(DBH_cm) + 0.619246*log(H_m) + 0.124205*log(Ca_m2) + 1.03509*log(WD_g_cm3) C(AGB) t D t ậ t p ế D H t iii) ế D H H ế t D ế ế l l D H t t ậ ế D H H H H t... established, of which 362 sample tree felled according to proportion number of trees at various diameter classes Based on the sample trees, fresh and dry biomass and carbon of the parts as mentioned above were determined and set of optimal models of carbon and biomass estimate is selected Results showed that: i) Allometric equations of above ground biomass (AGB) from one variable of DBH was with average deviation... S% = 43 – 107%, and Chave (2005) with S% = 52 - 94% This indicates that it is need to specifically model for each eco-region of Vietnam aiming to reliability and accuracy of estimates ii) Similar to AGB equations, the lowest average deviation was found in the model of Carbon of AGB (C(AGB)) involving 4 variables with S% = 13.2% iii) Most average deviation remarkably reduced when adding Ca variable... 9 n gi t ư M n ư B(BGB)) 3.4 tn in t n ối n i n ố n G t t l ư i t t D t G ì G G ết t G ả tì 8 11 i gi t t t ng t ng l t ế t l ì t lự t n ế l ì H lập t ế t tế ợ t ợ n ế t ếp ậ G t t ì ll t t t G ổ t t t t G = 20%*AGB (IPCC, (2006), MacDicken (1997) ì t t t lập 6 C(AGB) = f(DBH, H, WD, Ca) tn G p H p l ậ 8 tì t t t l l p ự l t t ì Plot of log(C_AGB kg) observed t R2 4 5 G p ế ả l D H ng 2 3 4 tn t i... http://www.fao.org/docrep/W4095E/w4095e00.htm#Contents Brown, S 2002 Measuring carbon in forests: current status and future challenges Environmental Pollution, 3(116): 363–372 Brown, S and Iverson, L R., 1992 Biomass estimates for tropical forests World Resources Review 4:366-384 Brown, S., Iverson, L R., Prasad, A., 2001 Geographical Distribution of Biomass Carbon in Tropical Southeast Asian Forests: A database University... estimation through destructive sampling CIFOR MacDicken, K.G., 1997 A Guide to Monitoring Carbon Storage in Forestry and Agroforestry Projects Winrock International Institute for Agricultural Development Pearson, T., R., H., Brown, S., L., Birdsey, R., A., 2007 Measurement Guidelines for the Sequestration of Forest Carbon United States Department of Agriculture (USDA) Forest Service General Technical... M.A., Chambers, J.Q., Eamus, D., Folster, H., Fromard, F., Higuchi, N., Kira, T., Lescure, J.P., Nelson, B.W., Ogawa, H., Puig, H., Riera, B., Yamakura, T., 2005 Tree allometry and improved estimatyion of carbon stocks and balance in tropical forests Oecologia145 (2005): 87-99 DOI 10.1007/s00442-005-0100-x Chave, J., Condit, R., Aguilar, S., 2004 Error propagation and scaling for tropical forest biomass .  2  DBH (cm) Cst (kg /cây) C(BGB) (kg /cây) Cbr (kg /cây) Cl (kg /cây) Cba (kg /cây)  (kg /cây)  2 (kg /cây) 5 2.0 0.4 0.4 0.1 0.2 3.0 11.0 15. 46.8 676.2 2,481.5 7 DBH (cm) Cst (kg /cây) C(BGB) (kg /cây) Cbr (kg /cây) Cl (kg /cây) Cba (kg /cây)  (kg /cây)  2 (kg /cây) 55 699.3 118.8 202.9 8.7 77.8 1,107.5. t mô hình    vùng Tây Nguyên  