上海城市降水径流营养盐氮负荷及空间分布

在野外采样和室内化学分析的基础上，研究了上海市区，郊区各不同功能区内降水径流中营养元素氮的含量水平及其空间分布差异，研究结果表明，城市降水径流中营养元素氮具有较高的含量水平，其中TIN，NH4－N，NO3－N的均值含量分别为7．45，3．14，2．98和1．33mg/L，与同期河流水体中氮含量相比，降水径流中营养元素氮对河流水中氮含量水平具有重要的贡献，反映城市降水径流是一种不容忽略的非点污染源，从城市降水径流中营养元素氮负荷的空间分布来看，在工业区，交通要道，氮含量普遍偏高，而在居民居住区和商业区，氮含量普遍较低，此外，市区和郊区相比，在市区内氮含量普遍比郊区高。

Nutrient Nitrogen Loading and Spatial Distribution of Storm-water Runoff in Shanghai City

The concentration levels and spatial distribution of storm-water runoff taken from various functional areas in Shanghai city have been investigated based on field sampling and experimental analysis.Results have shown higher concertration levels of nitrogen in urban runoff.Mean values for TIN,NH 4-N,NO 2-N and NO 3-N are 7.45 ,3.14,2.98 and 1.33mg/L,respectively.In comparison with urban rivers,runoff nitrogen contributes greatly to river nitrogen concentrations,reflecting that urban runoff may be not an optimistic non-point source.On the spatial scale,the distribution of urban runoff nitrogen concentration is characterized by higher level located in industrial areas and traffic roads,and followed by decrease in residential and commercial areas.Meanwhile,in contrast to suburban areas,urban areas have higher concentration levels of nitrogen.