<正>通过林带对太湖地区农业非点源污染的控制效应研究,结果表明:农田生态系统中N、P等主要水污染物的迁移、淋失状况随轮作方式、作物种类及施肥状况而变化;农田与沟渠间的缓冲林带有利于截留和净化土壤径流中的N、P等物质,从而在一定程度上控制农业非点源污染。杨树生长快、用途广,适于太湖地区营造水环境保护林带。根据缓冲林带模型研究结果,农田与林带宽度比例(100～150)∶40或(150～200)∶60较为合理,这种模型既能少占耕地,又能净化水质、保护生态环境。

Through the research on the the controlling effects of shelter forest on nonpoint source pollution of agricultural lands in Taihu Lake area,we get some conclusions:The transfer and loss of N and P(main water pollutants) vary with means of rotation,types of crops and the amount of fertilizer.Shelter forest betweens farmlands and ditches can effectively stop and purify such elements as N and P in soil runoffs,thus controlling nonpoint source pollution of agricultural lands.Poplars with the characteristics of quickgrowing and high value are suitable to be planted as shelterforest in Taihu Lake Watershed.Based on the model of shelter forest,the width ratio of farmland to shelter forest is either between 100∶40 and 150∶40 or between 150∶60 and 200∶60. Such a model can not only save more farm land,but also purify water quality and protect ecological environment.