【摘要】 以闽楠天然次生林作为研究对象,通过标准地调查获取数据,利用Weibull分布、正态分布、对数正态分布、Г分布和β分布等5种概率密度函数对其直径分布规律进行分析,采用χ2法检验拟合效果,并以其最优分布函数建立参数预估模型。结果表明:(1)直径分布主要为反J型或正偏山状曲线形式,其最优直径分布函数为Weibull分布,接受率为81.3%;(2)Weibull分布预估尺度参数(b)模型的R2为0.996 6,形状参数(c)模型的R2为0.791 5,经检验其预估模型的通过率为100%。研究结果可为闽楠天然次生林相关经营数表的编制及科学经营管理等提供参考依据。更多还原

【Abstract】 Based on the data of sample plot investigation,the diameter distribution law of natural second?ary Phoebe bournei forest was analyzed by five kinds of probability density functions’ namely,Weibull distribu?tion,normal distribution,lognormal distribution,gamma distribution and beta distribution.The five diameter dis?tribution functions were tested through χ2 test.And the parameter estimation model was established by its opti?mal distribution function.The results showed that:(1)the diameter distribution curve was mainly inverse Jshape or positively skewed;the optimal diameter distribution function was Weibull distribution,whose accep?tance rate was 81.3%;(2)the R2 of Weibull distribution prediction scale parameter(b)model and shape param?eter(c)model were 0.996 6 and 0.791 5,respectively,and the passing rate of the prediction model was 100%.The study results can provide a reference for the establishment of related management tables and scientific man?agement of natural secondary Phoebe bournei forest.更多还原