[Objective] The aim of this study is to explore the effects of grassland degradation on soil physical and chemical properties, [ Method] The ratio of plant root to soil and soil texture on Alpine Meadow were investigated in this study, and soil available N, P, K, Cu, Zn, organic matter and pH value were also analyzed by routine analysis of soil nutrients in different degraded grasslands. [Result] With the intensification of degraded gradient and the soil depth, the ratio of plant root to soil was decreased gradually. The highest ratio of plant root to soil was in 0 - 10 cm depth of soil in grassland with different degraded gradients, while its ratio of plant root to soil changed from 0.001 00 to 0.040 00 with soil type of loam. Soil chemical characteristic changed in different degraded gradients. The content of available N, P, K reduced significantly with the soil depth and the intensification of degraded gradients. The content of Cu and Zn was relatively lack in degraded grassland. [Conclusion] There is no significant correlation between nutrition content or pH value and the succession degree of degraded grassland.%[目的]探讨草地退化对土壤理化性状的影响.[方法]研究退化高寒草甸土壤草土比、土壤质地等物理性状,用土壤养分常规分析法分析不同退化草地土壤速效氮、速效磷、速效钾、有效铜、有效锌、有机质及pH等.[结果]随着退化梯度的加剧和土层的加深,草土比逐渐减小；不同退化梯度的草地草土比在土层0 ～ 10 cm中最大,该层的草土比在0.001 00～0.04000变化,土壤类型为壤土类.不同退化梯度上土壤化学性质均发生变化,其中速效氮、磷、钾含量随土层的加深和退化程度的加剧明显减少.退化草地的微量元素铜、锌含量比较缺乏.[结论]各种养分含量和pH与退化草地演替度的大小无显著相关.
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