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为了有目的的培育杨树人工林，并为其合理设计、投入、抚育管理及采伐等提供科学依据，讨论Ⅰ－６９杨树人工林５个密度组（１１种密度）的林分生长规律，建立了三种具有Ｓ型增长的林分生长模型．并选出最适宜的ｃｈａｎｔｅｒ模型预测林分的生长，探讨林分的数量成熟龄。结果表明，不同密度组达到数量成熟的年龄不一样、密度较大的林分，首先进入数量成熟，密度较稀疏的林分达到数量成熟相对较晚。林木的单株材积生长随密度的增加而递减，林分总蓄积量的初期生长随造林密度的增加而递增，密度为（５ｍ×６ｍ，６ｍ×６ｍ）的林分后期生长量最大。不同密度林分连年生长量在６～１３ａ间处于生长峰值。
In order to provide a scientific basis for the rational design, investment, management and harvesting of poplar plantations, the stand growth patterns of five density groups (11 densities) of Ⅰ-69 poplar plantations were discussed. Three stand growth models with S-type growth were established. And select the most suitable chanter model to predict the growth of the forest, to explore the number of mature forest age. The results showed that in different densities, the mature population was not the same in age. The higher densities of the stands were the first to enter the mature stage and the sparsely-demarcated stands were relatively late in quantity and maturity. The growth of single plant volume per plant decreased with the increase of density. The initial growth of stand volume increased with the increase of plantation density, and the stand with the density of (5m × 6m, 6m × 6m) had the largest growth at later stage. The annual growth of different density stands in 6 ~ 13a in peak growth.