目前水质处于中等富营养化程度，非点源是主要污染来源，土地利用则是影响非点源的主要因素。
The water quality of Miyun reservoir is at medium-eutrophication situation, which is mainly caused by the non-point source pollution (NPS) in the watershed.
象农业使用中飘散的杀虫剂这类“非点源”污染又如何控制？这更是个长久和难缠的辩论题。
How to regulate "non-point source" pollution, such as pesticides from agricultural run-off, is a continuing, and harder, debate.
土壤磷素的农业非点源污染是导致水体污染的最主要的原因之一。
Soil phosphorus as agricultural non-point source pollution is one of the main factors which lead to water pollution.
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