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林业科学 ›› 1997, Vol. 33 ›› Issue (5): 412-417.

• 论文及研究报告 • 上一篇    下一篇

落叶松人工林威布尔分布参数与林分因子模型的研究

刘君然,赵东方   

  1. 内蒙古根河林业局 根河 022350
  • 收稿日期:1996-04-08 出版日期:1997-09-25 发布日期:1997-09-25

WEIBULL DISTRIBUTION PARAMETERS AND STAND FACTOR MODEL OF LARIX PLANTATION

Junran Liu,Dongfang Zhao   

  1. Gen He Forestry Bureau, The Innea Mongolia Autonomac Region GenHe 022350
  • Received:1996-04-08 Online:1997-09-25 Published:1997-09-25

摘要:

以落叶松人工林258块标准地为材料,求解了各标准地威布尔分布概率密度函数参数。多数普遍随上层高、直径的增大而增大,随密度增大而降低,据此构建林分因子与参数、参数间拓广Richards模型。通过精度、显著性、适用性、断面积平均直径等检验,参数模型与密度、上层高、直径模型结合最佳。模型可动态预测林分株数分布,为森林抚育间伐设计各生长阶段间伐方法、强度,预测林分蓄积等提供依据。

关键词: 威布尔分布, 参数, 密度, 直径, 上层高, 模型

Abstract:

Taking 258 plots of Larix plantation as the experimental material, probability density function parameters fitted to Weibull distribution of every plot were calculated. It was found that the parameters increased with increasing of upper height and diameter, but decreased with increasing of density. Thus, the Richards model extended relations between stand factor and parameter, among parameters was established. The combination of parameter model with density, upper height, and diameter model was determined the best, after precision, significance, applicability, and the average diameter of basal area were tested. The tree distribution of a forest stand can be predicted by the model. And the model can provide the base for intermediate cuttings at different growth stages and intensities, and predicting stand volume.

Key words: Weibull distrbution, Parameter, Density, Diameter, Upper height, Model