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在林分生长模型研究中,选择描述林分直径分布的函数至关重要。以雷州半岛白骨壤种群为研究对象,对其开展直径调查,所得数据以偏度、峰度为指标,并运用正态分布、Weibull分布和Gamma分布等3种概率密度函数进行参数拟合检验,分析白骨壤种群的直径分布特征。研究结果表明:雷州半岛白骨壤种群以中小径阶居多,其偏度和峰度均大于0,直径分布曲线为左偏态,分布曲线比较陡峭,呈尖峰态;正态分布和Weibull分布的拟合效果较差,而Gamma分布则具有较好的拟合效果;通过建立Gamma分布参数预估方程,可预测林分各个径阶的株数及其动态变化。通过对雷州半岛白骨壤种群直径分布规律的调查研究,以期为雷州半岛白骨壤群落的经营管理以及利用提供一定的参考。
In the study of stand growth model, it is very important to choose the function that describes the diameter distribution of stand. The population of Avicennia marina in Leizhou Peninsula was taken as the research object. Diameter investigation was conducted. The data obtained were skewness and kurtosis as indexes, and the parameters were fitted by three kinds of probability density functions, normal distribution, Weibull distribution and Gamma distribution. Analysis of Avicennia marina populations diameter distribution characteristics. The results showed that the population of Avicennia marina in Leizhou Peninsula was dominated by medium-small path, the skewness and kurtosis were all larger than 0, and the diameter distribution curve was left-skewed. The distribution curve was steep with a sharp peak. The normal distribution and Weibull distribution And the Gamma distribution has a good fitting effect. By establishing the estimation equation of Gamma distribution parameters, the number of trees and the dynamic changes of each diameter can be predicted. Based on the investigation of the distribution of Avicennia marina population in Leizhou Peninsula, this paper will provide some reference for the management and utilization of Avicennia marina community in Leizhou Peninsula.