中文摘要：

在锡林郭勒高原和呼伦贝尔高原典型草原区选取19个调查点,对典型草原羊草＋大针茅群落在长期牧压下的植被状况进行了调查。处在不同退化演替序列的植物群落优势种的类型、活力和恢复力均存在很大差异,原生生态系统保持了健康的种类组成,能充分利用环境资源,形成较高的群落生产力。根据草地生态系统健康评价的研究,结合典型草原生态系统的群落特征及其退化演替模式,计算了不同植物群落的活力和恢复力指标。以1981年的羊草样地植物群落为参照系统,对不同退化状态的植物群落进行了量化分级,此可为草原管理、植被恢复重建和生态系统健康评价提供一定的参考。

英文摘要：

In this paper,19 survey sites in the typical steppe of the Xilin Gol Plateau and Hulunbeier Plateau in Inner Mongolia were selected.As the representative of typical steppe,the state of Leymus chinensis＋Stripa grandis vegetation was surveyed in the long term of in sustained and superstrong grazing.According to the research of the grassland ecosystem health assessment,we calculated the vigor and the resilience of different plant communities combining with the characteristics of the typical steppe ecosystem and the regressive succession pattern.Using the sample of Leymus chinensis in 1981 as a reference system,we quantitatively graded plant communities with different states of degradation,which could be used as a reference for the steppe management,vegetation restoration,assessment of typical steppe ecosystem health.