杨树为我区西部的乡土树种,初步统计,其中仅杨树的新种、新变种就分布有15种之多。我们选择阴山东段有代表性的4个区域的北京杨等六个树种,以树干解析法、多元线性回归法确定它们的生长量与当地气候因子的定量关系,探讨其对气候环境条件的选择性。为进一步扩大杨树造林,适 Poplar trees for the western region of our region native species, preliminary statistics, of which only the new species of poplar, the new varieties are distributed as many as 15 species. We chose six representative Beijing tree species such as Beijing Yang in 4 representative areas in the east of Yinshan Mountain to determine the quantitative relationship between their growth and local climatic factors using tree trunk analysis and multivariate linear regression to explore their selection of climatic and environmental conditions Sex. To further expand poplar afforestation, fitness