DEVELOPMENT OF ALLOMETRIC EQUATIONS FOR ESTIMATING BIOMASS AND CARBON STOCKS OF INDIVIDUAL TREES OF Casuarina equisetifolia IN VINH LONG PROVINCE
DOI:
https://doi.org/10.70169/VJFS.1294Keywords:
Allometric equation, biomass, carbon, Casuarina equisetifolia, Vinh Long provinceAbstract
This study was conducted to develop allometric equations for estimating the aboveground biomass and carbon stocks of individual trees of Casuarina equisetifolia in Vinh Long province, Vietnam. Data were collected from 40 destructively sampled trees with diameter at breast height (D1.3) ranging from 4.9 to 33.7 cm. Of these, 34 trees were used to develop the allometric equations, while the remaining six trees were examined for model validation. The equations were developed using Statgraphics software and evaluated based on the coefficient of determination (R²), standard error of estimate (SEE), mean absolute error (MAE), sum of squared residuals (SSR) and relative error. The results indicated that the biomass and carbon stocks of individual trees of Casuarina equisetifolia were strongly correlated with D1.3. Power-function models were identified as the optimal equations for estimating biomass and carbon stock, including: Wtk = 0.1563*D1.3^2.53873 (R² = 98.58%); Wthk = 0.1009*D1.3^2.62568 (R² = 97.71%); Wcak = 0.02042*D1.3^2.47034 (R² = 90.34%); Wlak = 0.01697 *D1.3^2.28415 (R² = 84.19%); and Ctotal = 0.06557*D1.3^2.55408 (R² = 98.57%). The mean relative error of the developed models ranged from 3.4% to 6.2%.
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