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以峰度、偏度和变动系数为指标研究了辽东山区天然次生林直径株数分布特征。运用Johnson’s SB分布、Gamma分布、3参数和2参数Weibull分布等4种概率密度函数研究了辽东山区天然次生林直径株数分布规律,同时利用Kolmogorov-Smirnov(KS)检验法来检验4种概率分布的拟合效果,结果表明:林分直径的株数分布以Johnson’s SB分布拟合效果最好,Weibull分布(包括2参数和3参数)仅仅适合中度区和弱度区,但不是最好。所有的分布模型均通过了优势度检验,说明均适用于直径株数分布的拟合。
Based on the kurtosis, skewness and coefficient of variation, the distribution characteristics of diameter of natural secondary forest in eastern Liaoning were studied. The distribution law of the diameter of natural secondary forest in Liaodong mountainous area was studied by using four kinds of probability density functions such as Johnson’s SB distribution, Gamma distribution, 3-parameter and 2-parameter Weibull distribution. At the same time, Kolmogorov-Smirnov (KS) test was used to test four kinds of probability distribution The results showed that the distribution of plant diameter was the best in Johnson’s SB distribution, and the Weibull distribution (including 2 and 3 parameters) was only suitable for moderate and weak areas, but not the best. All distribution models passed the dominance test, indicating that they are suitable for the fitting of the diameter number distribution.