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中文摘要：
通过对比西安市皂河多次水质监测结果,分析了城市小流域水环境中氨氮（NH4-N）的污染特征。结果表明：1）皂河NH4-N平均浓度在空间上的变化为上游和中游高于下游;2）枯水期24h的河流流量与NH4-N浓度负相关;3）洪水统计分析,NH4-N浓度峰均超前于流量峰;4）洪水过程中NH4-N污染物负荷主要以点源污染为主,非点源污染仅占6.0%。
英文摘要：
The water characteristics were analyzed during the flood and non-flood periods according to the water monitoring data of Zaohe River in Xi＇an city from March to August in 2010.The conclusion is that：1） the average concentration of ammonia nitrogen in the upstream and midstream are higher than in downstream in Zaohe River;2） the ammonia nitrogen concentration is negatively correlated with the river flow in dry season;3）in the flood statistic analysis,the concentration peak of ammonia nitrogen is ahead of the flow peak;4）the ammonia point source pollution load gives first place to the total pollution load,and the non-point source pollution is only 6.0% in the flood period in Zaohe River.
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