坡地固氮植物篱在农业面源污染控制方面的作用与营建技术

随着我国人口不断增长和社会经济的持续发展，耕地面积逐步减少，水土流失十分严重。土壤中的养分进入河流、湖泊，引发水体富营养化。为了从源头上控制农业面源污染，必须根据土壤生物热力学原理，以土壤为中心，大力治理坡地。在查阅文献的同时，结合现有的研究成果，发现在坡地营建等高固氮植物篱是一项有效措施，既可以利用生物固氮，减少化肥施用量，维持土壤一定的生产力，又能够防止水土流失，拦截、减缓地表径流，吸收土壤中的养分；氮、磷在岸边植被带的截留率分别为89％和80％，还可以带来一些经济收益。在此基础上，提出了坡地固氮植物篱的若干关键营建技术及应注意加强抚育管理，防治病虫害。

Effects and Planting Techniques of Hedgerow Intercropping on Sloping Lands in Agricultural Non-point Source Pollution Control

Non-point source pollution is becoming more and more serious in China with population growth and socioeconomic development.Thus,sloping lands are paid a great attention in order to gain much more products.While forest coverage decreases there,when heavy raining happens,soil erosion gets worsening.In this case,much more nutrients enter rivers and lakes which result in eutrophication.For controlling non-point source pollution from the sources,sloping land management in the headwater regions is necessary.It ha...