[Objective]This study investigated and analyzed the Leymus chinensis communities characteristics of Hu-lunbeier prairies under various degrees of degradation in order to lay out relevant developmental foundations on protecting and promoting the sustainable utilization of Hulunbeier prairie resources. [ Method ] Based on the residential location from farthest to nearest, 3 different degrees of degradation samples, including mild, moderate, and severe, were sequentially provided to investigate and analyze the plot plant community characteristics. [ Result ]From the results, the plant community species' important values in every sample increased. Important values of the Leymus chinensis community increased as the degree of degradation increased, but the important values of relative Stipa baicalensis species decreased as the degree of degradation increased. Compared to those from the mild and moderate areas, Stipa baicalensis community plant species from the severe regions decreased obviously; their quantitative characteristics also declined. As the degree of degradation increased, the ct-diversity index also decreased. [Conclusion]The prairie degradation succession not only changed the community species composition significantly, but also led to changes in the species diversity.%[目的]调查分析呼伦贝尔草原不同程度退化下羊草群落特征,为保护和促进呼伦贝尔草地资源的可持续利用和发展提供依据.[方法]距居民点位置由远而近依次设置了轻度、中度和重度3个不同程度的退化样地,对样地内植物群落的特征值进行调查分析.[结果]各样方羊草群落中物种的重要值变化较大,随退化程度增加,重要值为上升趋势,重度退化区明显升高;α多样性指数随着退化程度的增加均表现出降低的趋势.植物群落的物种优势度、多样性、丰富度、均匀度指数依次为:轻度退化草地＞中度退化草地＞重度退化草地.[结论]草地的退化演替使群落物种组成发生重大变化,同时会导致物种多样性发生改变,但随着干扰和退化程度的加剧而降低.
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