思茅松人工幼龄林和中龄林直径分布规律的研究

以40块思茅松幼、中龄人工林样地资料为依据,利用正态分布和Weibull分布密度函数对林分的直径分布进行拟合。卡方检验表明,正态分布的适合率为95.0%,Weibull分布的适合率为97.5%;Weibull分布、正态分布都可以用来描述思茅松幼、中龄林林分直径分布。林木竞争、分化激烈的林分,用Weibull分布来描述其林分直径分布较正态分布适合;而竞争、分化不太剧烈的林分,尤其是自疏开始前的幼龄林,用正态分布来描述其林分直径分布较Weibull分布适合。

Study on the Diameter Distribution Laws of Young and Middle Aged Pinus kesiya var. langbianensis Plantation

On the basis of the investigation of 40 standard plots of young and middle aged Pinus kesiya var.langbianensis plantation,and normal distribution and Weibull distribution density function were used to imitate the diameter distribution of Pinus kesiya var.langbianensis plantation.According to the Pearson test result,normal distribution was followed by 95.0% and Weibull distribution by 97.5%;both distributions could describe the diameter distribution of young and middle aged Pinus kesiya var.langbianensis pla...