[Objective] This paper aimed at revealing the rules of phenotypic variation of Leymus chinensis in Zhalong wetlands and providing the scientific and theoretical bases for devising protection strategies of Leymus chinensis populations in Zhalong National Nature Reserve. [ Method] Four phenotypic traits of five Leymus chinensis populations in Zhalong Wetlands were comparison and analysis using principal component analysis method and UPGMA cluster analysis method. [ Result] There were significant differences among the four phenotypic traits of five populations, the order of coefficients of variation were node number > plant height > leaf width > leaf length; the order of variation degrees of the populations from large to small was KQH ,MD,JZ,ZK,TTG population. Results of principal component analysis suggested that the four traits were all factors led to the phenotypic differences among the populations of Leymus chinensis. Leymus chinensis of five populations were divided into three groups by cluster analysis, MD, JZ and TTG were classified as one group, KQH and ZK population were individually classified as one group. [ Conclusion] Leymus chinensis had large-scale phenotypic variations and showed strong adaptability to different habitats, which was very important for selection, breeding of fine varieties and germplasm conservation.%[目的]揭示扎龙湿地羊草(Leymus chinensis)表型变异规律,为扎龙自然保护区羊草居群保护策略的制订提供科学的理论依据.[方法]采用主成分分析和UPGMA聚类分析对扎龙湿地5个羊草居群的4个性状进行了比较分析.[结果]5个居群4个性状差异显著,变异系数节数＞株高＞叶宽＞叶长；居群间的变异程度由大到小依次为克钦湖(KQH)、满代(MD)、局址(JZ)、赵凯(ZK)、唐土岗(TTG).主成分分析结果显示,这4个性状都是造成羊草表型差异的主要因素.聚类分析将5个居群的羊草分为3类,其中满代、局址、唐土岗聚为一类,克钦湖和赵凯居群各单独聚为一类.[结论]羊草的表型变异较大,对不同生境表现出较强的适应性,这对开展良种选育、种质资源保存具有重要意义.
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