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利用１１种密度Ⅰ－６９杨树人工林的胸径及树高生长材料，建立树高及胸径的生长模型。通过６种模型的比较，选出最适宜的Ｌｏｇｉｓｔｉｃ树高生长模型及单分子胸径生长模型。探讨了树木的径、高生长规律。１１种密度的胸径生长可划分成５个密度组（４ｍ×６ｍ，４ｍ×７ｍ）；（５ｍ×６ｍ，６ｍ×６ｍ）；（５ｍ×８ｍ，６ｍ×８ｍ，７ｍ×７ｍ）；（５ｍ×１０ｍ，７ｍ×８ｍ，８ｍ×８ｍ）；（５ｍ×１５ｍ）。密度对树高生长影响不大。通过对胸径连年生长量的分析，划分了不同密度组Ⅰ－６９杨树生长的Ⅵ个阶段，为合理培育杨树人工林提供科学的理论根据。
Based on the DBH and height growth materials of 11 kinds of poplar Ⅰ-69 poplar plantations, the growth models of tree height and DBH were established. Through the comparison of the six models, the most suitable Logistic tree height growth model and single-molecule DBH growth model were selected. Explore the diameter and height growth of trees. The DBH growth at 11 densities can be divided into 5 density groups (4m × 6m, 4m × 7m); (5m × 6m, 6m × 6m); (5m × 8m, 6m × 8m, 7m × 7m) 10m, 7m × 8m, 8m × 8m); (5m × 15m). Density has little effect on height growth. Through the analysis of annual growth of DBH, VI stages of growth of Ⅰ-69 poplar in different densities were divided, which provided a scientific theoretical basis for the rational cultivation of poplar plantation.