论文部分内容阅读
非点源污染是影响水源地水质的重要原因。研究以丹江口库区五龙池小流域为研究区,基于2014年相关数据,利用输出系数模型,借助地理信息技术,对该小流域农业非点源污染进行模拟,分析流域非点源污染的空间分布特征,解析其主要污染源,以深入理解丹江口水源地农业小流域的非点源输出特征。研究表明,2014年流域内农业非点源总氮污染负荷为5.674 t,流域内平均负荷强度为2.96 t km-2;农业非点源总氮负荷总量主要分布在耕地和居民地,农业用地是主要污染源,贡献率为47.9;人畜粪便农业非点源总氮负荷强度为39.2 t km-2,是流域平均负荷强度的13倍;缓坡区具有较高的非点源输出风险;改变粗放的农业管理模式,合理处理畜禽排泄物和农村生活污水是流域非点源治理的有效措施。
Non-point source pollution is an important reason for water quality. Taking the Wulongchi catchment in Danjiangkou reservoir area as a research area, based on the relevant data in 2014, using the output coefficient model and geographic information technology, the agricultural non-point source pollution in the small watershed was simulated to analyze the space of non-point source pollution Distribution features, analyze the main sources of pollution, in order to gain a deeper understanding of the non-point source output characteristics of agricultural watershed Danjiangkou source. The results show that in 2014, the total N load of agricultural non-point source pollution in the basin was 5.674 t and the average load intensity in the basin was 2.96 t km-2. The total N load of agricultural non-point source was mainly distributed in cultivated land and residential area, Is the main pollution source, the contribution rate is 47.9; the total N load intensity of non-point source of human and livestock fauna is 39.2 t km-2, which is 13 times of the average load intensity of the basin; Ramp slope area has a higher risk of non-point source output; Agricultural management mode, reasonably dealing with livestock and poultry excrement and domestic sewage in rural areas are the effective measures for non-point source management in the basin.