摘要
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,土壤肥力越好,水土保持效益也越好;(2)生态修复措施后平均土壤有机质含量为20g/kg以上,对水土保持起到积极的效果;(3)坡度低于15°的凹平坡地,乔木的物种多度低,有机质含量也低。
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.
出处
《中国农学通报》
CSCD
2005年第4期318-321,共4页
Chinese Agricultural Science Bulletin
基金
长江上游水土保持委员会2003年重点资助项目重庆市科委资助项目(渝科发计字[2003]21号)
