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通过对由１５７个优良无性系组成的毛白杨种源试验林的研究，提出了优良无性系选择的定量公式，并对前５０名无性系进行了排序，结果表明，毛白杨生长的主要因子是年降雨量和平均温度
Based on the study of Populus tomentosa provenance forest consisting of 157 elite clones, the quantitative formulas for selecting excellent clones were put forward and the top 50 clones were sequenced. The results showed that the main factors of Populus tomentosa growth were Annual rainfall and average temperature