牛姆林米槠天然林主要树种直径分布结构特征的研究

运用5种分布函数模型对福建永春县牛姆林米槠天然林主要树种的胸径和地径进行拟合,以筛选出拟合效果较好的分布函数模型,探索其林分直径结构特征。结果表明:1米槠林分直径分布结构应用正态分布模型拟合效果最好;2峭度、偏度和变动系数等特征值可用于描述天然林的生长特点;3正态分布参数可通过较易获取的林分直径实测值来预估,进而预测林分各径阶林木株数、蓄积量及其动态变化,为米槠天然林合理的经营管理提供科学的参考依据。

Study on the Diameter Distribution Strutcure Characte irstics of Principal Species in the Castanopsis carlesii Natural Forest of Niumulin Nature Reserve

Five distribution function models were applied in the fitting of trunk diameter and ground diameter, and then selected the distribution function models with better fitting effect, so as to analyze the diameter structure characteristics of the standing forest in the natural forest of Castanopsis carlesii in Niumulin Nature Reserve. The results showed that ①normal distribution is the best model to express the structure of chest height and place diameter of tree population in natural forest of C. carlesii ; ②Such eigenvalues as kurtosis, skenwess and coefficient of variation may be used to illustrate the growing characteristics of nature forest and ③by establishing normal parameters predicted equa- tion, the individual plants of every diameter grade, the amount of growing stock and dynamic changes were predicted to provide thescientific reference for natural forest management and operation.