【摘要】 农业非点源污染主要是农业活动中引入的外源物质超过土壤环境容量,营养物质大于作物生长所需,过剩物质积累于土壤中形成的污染。在对不同利用类型农耕地土壤理化性质测定的基础上,以林地土壤为参照,选取黏粒含量、pH值、有机质、全N、全P、水解性N、速效P作为研究指标,运用灰关联度的原理及方法,分析了不同土地利用类型、不同耕作制度以及与居民点不同距离所引起的土壤环境污染的差异。结果表明,农耕地土壤污染发生机率水田>菜地>旱地,春秋两季耕作土壤>单季耕作土壤,距居民点越近,土壤污染越严重。更多还原

【Abstract】 Agricultural non-point source pollution is mainly induced by the excess matter accumulated in soil,when the exogenous substances are beyond soil environmental capacity and nutrients are beyond the need of plant growth. Based on the analysis of soil physical and chemical properties in different land uses,clay particle content,pH,organic matter,total nitrogen,total phosphorus,hydrolysis nitrogen,and available phosphorus were chosen as indexes and forest soil was taken as control. Grey relation principle and method were used to analyze soil pollution and its distribution in different land uses,different planting patterns,and different distances from residential areas. Analyses indicate that by soil pollution ratio,cultivated lands are in the order of paddy field>vegetable land>upland and soils are in the order of farmland pollution with two-maturity per year>signal harvest. The shorter distance from a residential area,the heavier soil pollution is.更多还原