Modeling above-ground biomass for three tropical tree species at their juvenile stage

다국어 초록 (Multilingual Abstract)

Accurate prediction of biomass for juveniles (sapling and seedling) of any stand is important to estimate total biomass orcarbon stock in the stand. In this study allometric biomass models were developed for prediction of above-ground biomassfor three major tropical tree species (Shorea robusta, Terminalia tomentosa, and Acacia catechu) at their juvenile stage.
Biomass data for this study were acquired from 120 destructively sampled juvenile individuals (40 for each species) ofthese species in the lowland of western Nepal. Among several mathematical models tested, an exponential model withdiameter and total height as explanatory variables showed the best fits to the data (i.e. smallest root mean square error(RMSE) and Akaike information criterion (AIC), and largest R2adj). Also the same model form with diameter, height andwood density as explanatory variables fitted the data equally well. All other models with diameter alone or its combinationwith other variables showed relatively poorer fits. The first two best models of the forms yi ¼ expfb1ðD2i HiÞb2g andyi ¼ expfb1ðrD2i HiÞb2g explained >92% above-ground biomass proportion, resulting in a small random variation ofresiduals around zero (RMSE ¼ 62 g). Thus, for more accuracy, one of these two models was recommended to predictabove-ground biomass of juveniles of three species. Since the models developed in this study are explicitly site-specific,their application should be restricted to site, size and stand conditions similar to the basis of this study. Further works forvalidation and verification of the presented models with new data from a wider range of site, size and stand conditions ofShorea robusta, Terminalia tomentosa, and Acacia catechu are recommended.

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