不同密度Ⅰ－69杨树生长规律的研究

Studies on the Growth of Poplar Plantation of Different Spacings

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。

Data of Ⅰ-69 poplar plantations of 11 different spacings was used to build the D.B.H. and H growth models. Through comparison of 6 kinds of different models, one best suitable model was selected for the H growth (Logistic model) and one for the D.B.H. growth model (mitscherlich model). The D.B.H. growth of trees of 11 different spacings can be classified into 5 groups: (4m×6m, 4m×7m); (5m×6m, 6m×6m); (5m×8m, 6m×8m, 7m× 7m); (5m×10m, 7m×8m, 8m×8m); (5m×15m). Different spacings didn't affect the H growth of poplar plantations. Through the analysis of annual D.B.H. growth, the tree growth in different stages was studied in detail. It provides a scientific and theoretical basis for the cultivation and mangagement of poplar plantation.