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根据 2 90块 I- 6 9杨标准地调查资料 ,采用典型相关分析方法对树冠特性与生长的关系进行了定量分析 ;分别不同立地指数、不同造林密度拟合了胸径、树高、材积的 Richards生长曲线 ,并用有序样本聚类法以树高和胸径连年生长量为分析指标对生长阶段进行了划分 ,分析了不同状态下各生长期的特性。认为 I- 6 9杨是一个速生性十分明显的无性系 ,造林密度太大时会掩盖立地对生长和产量的效应。培育胶合板用材 ,应选择高立地 (2 0、2 2 m)地段和采用小密度 (156、2 0 4株·hm-2 )的栽培技术措施
According to the survey data of 2 90 I-6 9 Yang standards, the relationship between crown characteristics and growth was analyzed by canonical correlation analysis. The Richards with different stand index and different planting densities were fitted with DBH Growth curve. The order of cluster analysis was used to divide the growing stage with tree height and annual DBH as the analysis index, and the characteristics of different growth stages were analyzed. It is believed that I-6 9 Yang is a very fast-growing clonal clotting plant that can mask the site’s growth and yield effects when the plantation density is too high. Nurture plywood timber, should choose the high ground (20,22 m) lots and the use of low-density (156,240 plants · hm-2) cultivation techniques