The Study on Self-Restoration of Different Runoff Plots in PingChang Sichuan

四川省平昌县是长江流域生态修复的试点县之一，生态修复区布设在“长治”工程竣工后治理程度较好的小流域内，主要采取封禁治理的措施，加强植被的自我恢复能力。文章选取不同海拔，坡度，坡向，不同林种配置和林分结构的四个径流区进行研究，通过对植被重要值、物种多样性、优势度、均匀度等的计算分析以及对土壤肥力的测定分析，得出以下结论：（1）物种多样性较高的径流区其土壤肥力也较高，表现为：群落总体物种多度顺序为：深溪沟>许家沟>涵水沟>国林沟，土壤有机质含量大小顺序为：深溪沟>许家沟>涵水沟>国林沟，特别是灌草类越多，土壤肥

The Study on Self-Restoration of Different Runoff Plots in PingChang Sichuan

Pingchang is one of the counties of self-restoration in the upper and middle reaches of Yangtze River. The self-restoration plots, located in the better management small watershed of "Changzhi project", take measures of closing hillsides to improve the abilities of plant self restoration. The article studies on the four runoff plots of different altitude, slope, aspect, collocation of forest types and forest structure, computes the vegetation important value, species diversity, domination degree, evenness degree and soil physiochemical properties. The results show that : (1)The richer species diversity are, the higher the contents of soil organic matter are;(2)The even contents of soil organic matter is more than 20 g/kg after self-restoration of ecology; (3) The species diversity of arbor and the contents of soil organic matter are lower in less than slope of 15 degree.