Abstract: A simulated experiment was conducted in alpine meadow of Henan county,Qinghai Province to investigate the vegetation reconstruction on pika hill covered grassland,including the species composition,species diversity,vegetation coverage,and determine the contribution rate of native species to the emerged community in pika hill. The aim of this study is to provide data and scientific basis for restoration and succession of pika hill vegetation. The results showed that emerged plant species in pika hill were mainly perennial weeds after the formation of pika hill. The Simpson index,Shannon Weiner index,Richness index and Evenness index of the newly formed plant communities where covered by pika hill for 1-2 years was tend to rise quickly at the begining and then keep stable. The proportion of species from covered native vegetation to the reconstructed pika hill plant community reached up to 47.1%~64.7%. After the pika hills were formed,vegetation restoration succession occured and the overage of vegetation increased steadily.

Key words: Pika hill, Species composition, Species diversity, Vegetation coverage, Contribution rate

摘要： 本研究以青海省河南县高山嵩草高寒草甸高原鼠兔鼠丘为研究对象，进行鼠丘覆压植被模拟试验，探究萌出植物群落的物种组成、物种多样性、植被覆盖度以及原生植被对鼠丘植物群落重建的贡献率，为鼠丘植被恢复演替提供依据。结果显示：随着鼠丘形成时间的推移，萌出植物主要为多年生杂类草；鼠丘覆压1-2年后萌出植物群落的辛普森指数、香农威纳指数、丰富度指数与均匀度指数整体表现为先快速上升后趋于缓和；被覆压的原生植被对鼠丘植物群落重建的贡献在物种组成上达到47.1%~64.7%。随着鼠丘形成时间的延长，鼠丘向有植被定居的恢复演替方向发展，植被覆盖度逐渐增加。

关键词: 鼠丘, 物种组成, 物种多样性, 植被覆盖度, 贡献率