Allometric equation for estimating tree above ground biomass modified by ecological and forest environmetal factors in dipterocarp forests
Keywords:
Biomass equation,, dipterocarp forest, ecological factorAbstract
The purpose of the study was to validate and select the best model for estimating
tree above ground biomass (AGB) in dry dipterocar forests under the influence of
ecological and forest environemtal factors to improve the reliability. A total of 329
trees were destructively sampled to obtain a dataset of the dry biomass of AGB; The
estimation methods for equations were weighted nonlinear fixed/mixed models
with/without random effects fit by Maximum Likelihood; Using K-fold cross
validation with K = 10, we compared AGB predictions from developed AGB models
with and without ecological or forest environmetal factors. As a result, each
ecological or forest environmetal factor did not affect AGB, while the combined
factors effect to AGB model through the form: AGB = AVERAGE × MODIFIER
that was significantly more reliable than model without these factors involved.
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