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本研究基于帽儿山实验林场和穆棱林业局的119块天然次生林标准地调查数据。运用SB分布、指数分布、正态分布、Weibull分布和β分布函数对其进行拟合,分析林分直径分布规律,采用矩解法求解参数,更精确地比较各种分布函数对实际数据的拟合效果。研究结果表明:指数分布和Weibull分布的拟合效果较好,指数分布优于Weibull分布;指数分布函数的参数a基本不变,参数b变化,参数b与林分平均直径有显著的相关性。
This study was based on the survey data of 119 natural secondary forests in Maoershan Experimental Forest Farm and Muling Forestry Bureau. The SB distribution, exponential distribution, normal distribution, Weibull distribution and β distribution function were used to fit them. The distribution law of stand diameter was analyzed. The moment method was used to solve the parameters, and the fitting of various distribution functions to the actual data was more accurately compared effect. The results show that the fitting effect of exponential distribution and Weibull distribution is better, and the exponential distribution is better than Weibull distribution. The parameter a of exponential distribution function is basically unchanged, the parameter b is changed, and the parameter b is significantly correlated with the mean diameter of forest stand.