枣庄市黑杨直径结构的模拟研究

Simulation Study on Diameter Structure of Populus nigra Stand in Zaozhuang City

分析了黑杨树的直径结构特征,分别利用5种分布函数即正态分布、Weibull分布、Gamma分布、对数正态分布以及Logistic分布对黑杨树林的直径分布进行了拟合,同时用卡方统计量对5种分布进行了检验。拟合结果和检验结果一致表明,在这5个拟合分布函数中,Weibull分布用于拟合黑杨树林分直径分布的效果最好,Gamma分布的拟合效果次之。

Diameter structural characteristics of Populus nigra stands were analyzed and diameter distribution were fitted by five kinds of distribution functions,that are normal distribution,Weibull distribution,Gamma distribution,lognormal distribution and Logistic distribution. Meanwhile,chi-squared statistic was used to test five kinds of distribution. The consistent result showed that：concerning the diameter distribution of Populus nigra stands,Weibull distribution simulates much better than that of others,next is Gamma distribution.