摘要
林木直径分布及其变化规律的研究,至今并未很好解决。本文对单一林分总体提出一套对直径分布一致性和非一致性林分具有兼容性的模型,将有助问题的解决。一、分布预测模型的构造 (一)分布函数的选择和参数估计 1.分布函数的选择本文采用K.Pearson分布系来描述直径分布,所选6种分布函数详见表1。其中,x是随机变量,a、b、c、p和q是参数。
Family of Pearson type was selected as the function of diameter distribution in this paper, and the moment of first order 4 about the orgin was used as a link with distribution function. By means of analytical technology of time series, it recommended a series of dynamic models to express and predict future diameter distribution of existing stand. The practical data from the man made Populus even-aged stand were used to examine the effects of these models and the result was satisfactory.
出处
《林业科学》
EI
CAS
CSCD
北大核心
1990年第5期470-474,共5页
Scientia Silvae Sinicae
关键词
林木
直径分布
动态模型
林分
Family of Pearson type
Method of moments
Time series analysis
Moment about the origin
Diameter distribution
