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中文摘要：
目的估算南水北调中线陕西水源区非点源总氮污染负荷并分析其影响。方法利用输出系数法计算水源区非点源TN污染负荷。结果水源区陕西汉丹江流域非点源TN约为8.2×104t/a,主要来自汉江流域。结论非点源污染是影响陕西水源区水环境质量的一个重要方面,陕西水源区非点源污染的控制管理已刻不容缓。
英文摘要：
Aim To analyze the impacts on the water environment based on the estimation of pollution load of total nitrogen emitted from the non-point sources in Shaanxi province water source area,which is the proposed water source area of the central line of South to North Water Diversion Project. Methods The pollution load of total nitrogen and the pollution proportion of the pollutants originating from the non-point sources in the area are discussed by employing the export coefficient modeling approach. Results The results show that the pollution load of total ni-trogen from the non-point in the water source area amounts to 7. 40 × 104 ton annually. Over 78 percent of the pollutants in HanJiang Basin are from the non-point sources in the wet and flat year,and the proportion of the total nitrogen pollution is above 70 percent even in low flow and normal year. In Danjiang Basin,the pollution from the non-point sources contributes to 86 percent of the total nitrogen load in wet year,and the values keep around 70 percent in the average,low flow and very low flow year. Conclusion Pollution from non-point sources tends to be the significant factor affecting the water quality in Shaanxi province water source. Accordingly,the control of the non-point source pollution in the area should be on the agenda very soon.
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