We present two models of log-linear equations for biomass estimation in planted staiids ef 3to 1"year-old Acacia mangium Willd. trees, using destructive sampling data of 59 trees in West Java, Indonesia. The log-linear equations include parameters for individual leaf, branch, stem, abeveground, belowground (rooO, and tutal biemass. Average annual increments of stand-level biomass were estimated at 7.77 to 1O.09t ha'' y'i (model A) and at 7.91 to 10,27t hai y'i (model B), with the largest values in the 5year-old stand, Following the methodology presented by IPCC National Greenhouse Gas Inventeries Programme, we calculated basic wood density (D), biomass expansion factors (BEF), and root-to-shoot ratios (R) of the study stands. 'Ihe value of D increased significantly as stand age increased frem 3 to 8 years, but did not significantly differ between & and 10-year-old stands.The value of BEF did not differ among the 3-to &year-old stands (average 1.332) and decreased te 1.180 in the 10-year-old stand. The values ofR increasecl significantly with stand age, from O.157 to O,190. The BEF values of A. mangi"m in this study were smaller than the default values for the tropica] broad-!eaf forest type (dbh > 10 cm) given by IPCC (mean, 3.4; range, 2.0-9.0). Because many factors may affect the parameter values oi log-linear equatiens and D, BEE and R for biomass estimation, the equations and values provided in this study are only applicable to A. mangium forests growing under comparable climatic, stand age, forest management conditions.
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