摘要
土壤及土壤养分流失是农业非点源污染的主要形式。选择珠江三角洲地区典型小流域——正坑小流域为研究区,在GIS技术支持下,建立流域数字高程模型并获取下垫面相关参数,采用通用土壤流失方程、固态污染物负荷方程,进行小流域农业非点源污染负荷估算与分析。结果表明,正坑小流域年土壤流失量为455061.60kg,旱坡地和果园两类土地利用景观类型具有相对较高的侵蚀模数;土壤N、P养分流失年负荷量分别为6335.32,1150.35kg,不同土地利用类型对非点源污染负荷的贡献率不同,水田中氮、磷流失对非点源污染负荷有重要影响。
Soil and soil nutrients loss is the main way of non-point source pollution(NPS). Taking a typical small watershed, Zhengkeng watershed of Zhujiang delta area as an example, this paper integrated GIS and the USLE, solid pollutant load equations and soluble pollutant load experimental equations, amount of soil and nutrients loss from different landuse landscape types were estimated and analyzed. The results indicated that the amount of soil loss is 455 061.60 kg/a. The erosion modulus of dry land and orchard were respectively 25 682.29 kg/(km^2·a), 61 132.97 kg/(km^2·a), which were more than others relatively in the watershed. The fixed pollutant loads of N and P were respectively 6 335.32 kg/a, 1 150.35 kg/a. The research showed it was the main contribution for agricultural NPS loads that N and P loss from farmland in Zhengkeng small watershed.
出处
《水土保持学报》
CSCD
北大核心
2004年第1期100-102,114,共4页
Journal of Soil and Water Conservation
基金
广东省科技攻关项目(2002C31617
2002C32203)
广东省环保局科技研发资助项目
