昆明市云龙水库径流区氮磷非点源污染负荷分析

云龙水库是昆明市最大的城市集中式饮用水源地。水源区农业非点源污染是影响水库水质的主要来源,因此分析水库径流区氮磷非点源污染负荷与来源构成,可为饮用水源区水质保护提供科学依据。采用输出系数模型法,对昆明市云龙水库径流区氮、磷负荷的产生量与入库量进行了估算。结果表明:(1)云龙水库径流区氮、磷非点源污染负荷产生量分别为2079.8和454.32t/a,入库量分别为207.98和24.73t/a。(2)从不同乡镇分析,撒营盘镇的氮、磷负荷产生量最高,云龙乡和茂山镇产出量较低,其余乡镇产生量相近。(3)从不同污染源类型分析,该区非点源污染的主要污染源为农村生活污染和畜禽粪便污染。

An Analysis of Norrpoint Pollution Loads in Yunlong Reservoir Runoff Field of Kunming City

It is important to find out the load and source for the norrpoint source pollution about nitrogen and phosphorus in the runoff field of Yunlong reservoir in order to provide a scientific basis to protect water quality.The nitrogen and phosphorus pollution loads in Yunlong reservoir runoff field were estimated according to the approach of export coefficient modeling.The results showed that:(1)The total nitrogen and total phosphorus loads of norrpoint source in Yunlong reservoir runoff field were 2079.8 and 454.32 t/a respectively and the pollution loads in reservoir were 207.98 and 24.73 t/a respectively.(2)Nitrogen and phosphorus loads in Sayingpan town generated the highest volume,Yunlong and Maoshan town export were the lowest,and the remaining towns produced nearly.(3)The main pollutant sources were domestic pollutant and poultry excrement pollutant.