北京密云水库流域非点源污染现状研究

密云水库流域非点源污染现状的初步研究表明 :流域非点污染源主要有化肥损失、畜禽粪便流失、水土流失三种类型。水土流失是最主要、最直接的污染源 ,同时也是其它二种污染的载体 ;不同土地利用类型及耕作方式对污染物流失影响强烈 ,农田流失最严重 ,其中坡耕地形式流失量最大 ;汛期污染物流失量约占全年流失量的 60 % ,表明非点源污染已成为影响水库水质的主要污染源。应推广水土保持技术 ,防止水土流失 ;合理施肥 ,重视畜禽养殖业的环境管理。

Investigation of Non-point Pollution in Watershed of Miyun Reservoir

Investigation of non point pollution carried out in the watershed area of Miyun Reservoir in suburban Beijing indicates three main kinds of non point source loads threatening water quality of the Reservoir: chemical fertilizer, wastes from animal husbandry and loading from soil erosion. Soil erosion in particular plays a most important role in loads of non point source. It is also found the variety of land use evidently affects the intensity of loss of nutrients and the loss of nutrients (TN and TP) in wet season account for 60% of the annual total nutrients loading. Compared with point pollution sources, which have been mostly brought under control around the Reservoir, non point pollution has constituted a prominent cause impairing the water quality. Suggestion was made in so far as soil conservation, proper use of chemical fertilizers and restrictions on poultry and livestock farms.