This paper analyse plant composition,aboveground biomass,the proportionof good grasses and nutrient element in soil at different degraded grassland in Dari county,Guoluo, Qinghai.

• 研究分析退化草地的植被组成、地上生物量、优良牧草比例、高原鼠兔密度以及土壤理化性质等特征，探讨“黑土型”退化草地的成因及生态过程。 结果表明，中度退化草地生物量最高（50.；3g/0