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在普遍调查云南松天然林分的基础上,根据树种特性和遗传改良的主要性状,确定以树高年平均生长量和木材纹理平均扭转度作为林分选择的主要性状,采用数量化理论Ⅰ的方法,建立环境因子,林分年龄与主要选择性状的回归方程,可对选择性状的环境效应作出定量估计,在多元分析的基础上,按照综合选择指数的大小评价林分优劣的理论,提出了川西地区云南松天然林分的等级划分标准与方法,从而为生产实践中改建母树林选择优良林分提供了科学依据.
Based on the general survey of the natural stands of Pinus yunnanensis, according to the characteristics of the tree species and the main characters of the genetic improvement, the average annual growth rate of tree height and the mean twist degree of wood texture were selected as the main characters of stand selection. Quantitative Theory Ⅰ Method and establish the regression equation of environmental factors, stand age and major selection traits, we can make a quantitative estimation of the environmental effects of selection traits. On the basis of multivariate analysis, according to the theory of comprehensive selection index, The criteria and methods for grade classification of natural Pinus yunnanensis in western Sichuan were provided, which provided a scientific basis for selection of good stands for rebuilding the parent tree in production practice.