Based on the investigation of industry,agriculture,residential live and livestock situation in protected areas of Nanwan reservoir drinking water sources,equivalent standard pollution load method was used to analyze each pollution source,thus clarified the main pollution source,pollutant and its spatial distribution in the protected area,proposed control measures on drinking water source protection.The results show that the main pollution comes from livestock,chemical fertilizer loss and water loss and soil erosion,the main pollutant of both point source and non-point source is TN,while TP is the potential threat to the non-point source water body.Point source pollutant comes most from the 158 piggery along the river,which equivalent pollution load ratio is 87.41％.Non-point pollutant mainly distributed in Tanjiahe Town,Lijiazhai Town,Shihegang Town and Dongjiahe Town,the equivalent pollution load ratio are 31.64％,24.50％,16.95％ and 15.68％ respectively.Relative protective measurements are proposed according to the evaluation results,which can provide reference for the safety and protection of drinking water source.%在对南湾水库饮用水水源地保护区各乡镇工业、农业、生活及养殖情况调查的基础上,采用等标污染负荷法,分析了保护区主要污染源、污染物及其空间分布特征,并提出了永源地保护的防控对策.结果表明:保护区主要污染源为畜禽养殖、化肥流失及水土流失,主要点源及非点源污染物均为氮、磷,为非点源污染的潜在威胁;点源污染源主要为靠近河道的158家养猪场,其等标污染负荷比达87.41％;非点源污染源主要分布在谭家河乡、李家寨镇、浉河港镇及董家河镇,其等标污染负荷比分别为31.64％、24.50％、16.95％与15.68％,累计达88.77％.最后根据污染源评价结果提出了水源地保护的防控对策.
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