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Tree-Size Variable Frequency Distribution Modeling for Tropical Forests in Ba Be, Vietnam

机译：Tree-Size Variable Frequency Distribution Modeling for Tropical Forests in Ba Be, Vietnam

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摘要

Tree-size variable frequency distributions are essential for sustainable forest ecosystem management. In Vietnam, a few theoretical distributions have been found to simulate tree-size quantities. Therefore, this study was carried out to understand characteristics of the quantities, select and compare the best distributions for their frequency distributions in Ba Be, Vietnam. The study established 10 plots for three forest types (rich, medium and poor) and measured tree-size quantities. The study tested 64 theoretical distributions for all variables in three forest types. The results indicated that for the diameter quantity: Weibull (3P) (P means parameter), Pearson 6 (4P) and Wakeby were the best. For the height quantity, Pearson 6 (4P), Dagum (4P) and Gen. Extreme Value is the best fit. For the commercial height variable, the best functions were Burr and Burr (4P), while Burr, Pearson 6 (4P) and Gumbel Max were the best distributions for the crown width quantity. All best distributions were significant at p-value < 0.001. Therefore, these best models can be used to propose silvicultural measures and make contributions to sustainable forest management and planning in the study area and regions with similar conditions.

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