小黑杨胸径和树高的生长动态

以张家口市坝上地区张北县、沽源县无性繁殖苗造林的小黑杨为研究对象,采用树干解析法获取3种方式繁殖(插条、断根和埋桩)造林的小黑杨的树高和胸径生长数据,利用Richards生长曲线方程和加权平均法,比较分析小黑杨胸径和树高生长,结果表明:1)3种不同方式繁殖的苗木胸径生长曲线均呈“S”状,有较高的相关性; 2)利用Richards生长曲线推测出的胸径值表现为断根小黑杨>埋桩小黑杨>插条小黑杨; 树高推测值表现为埋桩小黑杨≈插条小黑杨>断根小黑杨。

Tree Height and DBH Growth Models of Populus simonii ×P.nigra

Growth conditions of the trees of Populus simonii×P.nigra, which was afforested by asexual reproduction(cutting, purging and pile burying)in Zhangbei and Guyuan of Bashang in Zhangjiakou, Hebei Province were observed. Data such as tree height and diameter at breast height(DBH)were collected by analytical woods. The results showed that the growth curve of DBH of the trees from three breeding methods were exhibited “S” shape, and with high correlations. The calculated values of DBH obtained from Richards growth curve demonstrated purging > pile burying>cutting; tree height was in the order of pile burying≈cutting>purging.