中文摘要：

我们在北中国从五起源调查了 Populus simonii 的 phenotypic 变化。我们的结果证明重要差别词法、生理的特点地在不同起源的植物之间存在，除了叶柄长度和叶边缘的数字。为所有特点的变化的系数从 14.77% ～ 81.49%。区别(V 圣) 的吝啬的 phenotypic 系数是 47.1% ，它意味着在起源以内的变化是为在 P 的 phenotypic 变化的主要来源。simonii。基于一个平均连接计算方法给我们的簇起源的分析， P 的五起源。调查的 simonii 能被划分成三个组。我们的结果为基因资源保存和自然 P 的起源选择提供一个理论基础。在北中国的 simonii。

英文摘要：

We investigated phenotypic variation ofPopulus simonii from five provenances in northern China. Our results show that significant differences exist between plants of different provenances in morphological and physiological traits, except for leaf-stalk length and the number of leaf margins. The coefficient of variation for all traits ranges from 14.77% to 81.49%. The mean phenotypic coefficient of differentiation （VST） is 47.1%, which means that the variation within provenances is the major source for phenotypic variation in P. simonii. Given our cluster analysis of provenances based on an average linkage computing method, the five provenances ofP. simonii investigated could be divided into three groups. Our results provide a theoretical basis for genetic resource conservation and provenance selection of natural P. simonii in northern China.