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对天然林结构的研究,多采取划分林层和年令世代,把复层异令化为单层同令的办法,把它作为一个整体来研究尚不多见。我们根据多年来在川西原始林区所做的29块皆伐标准地3914株伐倒木和176个小班568153株林木的全林调查,对该区主要成林树种岷江冷杉林分的年令(A)、直径(d)、树高(h)等主要结构因子,分别计算了平均数(X)、变动系数(c~v)、偏度(g_1 )、峰度(g_2)等统计特征数,对所有分布序列进行了正态检
Research on the structure of natural forests more often takes the form of demarcation of forest layers and years from generation to generation, and makes it a monolithic one. It is not yet known to study it as a whole. According to the survey of 3914 planted trees and 176 small classes of 568,153 trees in the original forest area of western Sichuan that have been made in the past several years, we conducted a survey on the year (A ), Diameter (d) and height of tree (h), the statistical features such as mean (X), coefficient of variation (c ~ v), skewness (g_1) and kurtosis (g_2) A positive test was performed on all distribution sequences