敕勒川草原生态恢复群落动态演替

为揭示退化草原生态恢复过程群落动态变化规律，在阴山南麓敕勒川草原开展生态恢复试验，通过连续10年监测，研究不同年际退化草原生态恢复物种数、个体数、地上生物量和物种多样性变化，比较人工恢复、自然恢复与原生植被之间的物种多样性差异。结果表明：随着恢复时间的增加，草地Margarlef指数、Shannon-Wiener指数、Simpson指数均出现先增加后减少再稳定的趋势，而Pielou均匀度指数呈现先减少后增加趋势;不同恢复方式下，自然恢复样地和原生样地多样性指数均显著高于人工恢复样地(P<0.05)。人工干扰引导自然恢复能够促进退化草原生态恢复，提高植物多样性，加速恢复演替进程。

Ecological Restoration and Community Dynamic Succession in Chilechuan Grassland

To reveal the dynamic change law of community in the process of ecological restoration of degraded grassland,an experiment was carried out in chilechuan grassland at the south foot of Yinshan Mountain. Through continuous observation for 10 years,the changes in species number,individual number,aboveground biomass,and species diversity of ecological restoration of degraded grassland in different years were studied,and the differences in species diversity between artificial restoration,natural restoration,and primary vegetation were compared. The results showed that the margarlef index,Shannon Wiener index,and Simpson index all showed a trend of first increasing,then decreasing,and then stabilizing with time,while the Pielou evenness index showed a trend of first decreasing and then increasing. Under different restoration methods,the diversity indexes of natural restoration plots and original plots were significantly higher than those of artificial disturbance plots (P<0.05). The natural restoration guided by artificial disturbance can promote the ecological restoration of degraded grassland,improve plant diversity,and accelerate the process of restoration succession.