直径分布模型在尼日利亚Oluwa森林保护区大构造林体积估算中的应用

I. Y. Egonmwan, F. N. Ogana
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引用次数: 3

摘要

预测林分直径分布的能力对于森林管理者作出明智的管理决策(如造林处理和采伐制度的处方)至关重要。这种信息最好是从合适的分布模型中得到的。本研究评估了四种分布模型在描述尼日利亚奥卢瓦森林保护区柚木林分结构方面的表现。数据采集于柚木林内12块面积为20 × 20 m的临时样地。使用极大似然估计器拟合分布模型:beta、gamma、Johnson SB和Weibull与柚木林直径数据的拟合。利用四项指标的相对秩和,得出了林分最适宜的分布。结果表明,威布尔分布最适合柚木林分,其相对秩和为4.0。应用威布尔分布和合适的高径和体积模型,估算了木材粒径级(直径≥30 cm)的产量为136.281 m ha。估算林分面积为3096.4 m ha。还提供了其他产品规格。这将有助于看台的日常管理。
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Application of diameter distribution model for volume estimation in Tectona grandis L.f. stands in the Oluwa forest reserve, Nigeria
The ability to predict the distribution of diameters in a stand is essential for forest managers to make informed management decisions such as prescription of silvicultural treatments and harvesting regimes. Such information is preferably derived from suitable distribution model. This study evaluated the performance of four distribution models in describing the structure of the teak stands in Oluwa Forest Reserve, Nigeria. Data were collected from 12 temporary sample plots of 20 × 20 m size in the teak stand. Maximum likelihood estimator was used to fit the distribution models: beta, gamma, Johnson SB, and Weibull to the diameter data from the teak stand. Relative rank-sum derived from four indices was used to conclude on the most suitable distribution for the stand. The results showed that the Weibull distribution was the most suitable function for the teak stand with a relative rank-sum of 4.0. Application of Weibull distribution together with suitable height-diameter and volume models estimated yield of 136.281 m ha within timber size class (diameter ≥30 cm). And a total of 309.640 m ha was estimated for the stand. Other product specifications were also provided. This would help in the routine management of the stand.
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