I-69杨生长过程分析和生长阶段划分

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

Analysis of Growth Process and Partition of Growth Phase on Poplar Clone I-69

According to the survey data of 290 valuation areas,the authors quantitatively analyzed the relationship between the crown characteristic and growth with canonical correlation analysis method;fitted Richards growth model of diameter at breast height,height of tree and volume in different planting density and different site index;distingusished growth phase with ordinal sample cluster method by variable annual growth increment of diameter at breast height and height of tree; analyzed characteristic of each growth phase in different planting density and site index.The results showed that poplar clone I-69 is with characteristic of very distinct fast growth.In the condition of high planting density,the effects of site upon growth and yield are been weaken.For the sake of cultivating plantation for the plywood,the site with SI 20 m or 22 m and planting density 156 or 204 trees·hm^-2 should be adopted.