摘要
以偏度、峰度为指标研究了北京山区栎类天然林直径分布特征,运用Weibull分布、Normal分布、Lognormal分布和Gamma分布4种概率密度函数研究了栎树林分的直径分布规律,并利用Kolmogorov-Smirnov(KS)检验法来检验4种概率分布的拟合效果,结果表明:栎树林分中等稍偏小胸径的林木占大多数,Gamma分布拟合效果最好,并建立该分布的参数预估方程。
Some characters of diameter skewness and kurtosis. The stand dia distribution of meter ity density functions. Weibull distribution, distribut Normal oak plants in Beijing were studied by using ions in the oak plants were simulated by four distribution, Lognormal distribution and Ga indices of probabilmma distribution. The four distribution functions were tested through Kolmogorov-Smirnov test. The results showed that the majorities of oak plants were medium and small diameter at breast height trees and Gamma distribution simulates much better than that of the others. In the end, the relations between Gamma function parameters and stand variables were established.
出处
《西北林学院学报》
CSCD
北大核心
2009年第6期1-5,共5页
Journal of Northwest Forestry University
基金
"十一五"国家科技支撑计划重点项目(2006BAD23B0202-1)
关键词
栎树
直径分布
偏度
峰度
oak plants
diameter distribution
skewness
kurtosis
