Atmospheric nitrogen wet deposition and its effects on wetland water environment of Shanghai area
上海地区大气氮湿沉降及其对湿地水环境的影响

Based on the observation data of the rainfall and its NO3 (-) -N and NH4 (+) -N concentrations in Shanghai area from 1998 to 2003, and by the method of single factor evaluation, this paper studied the flux of atmospheric nitrogen wet deposition and its effects on wetland water environment of this area. The results showed that in the six years, the nitrogen content in the rainwater was rather high, with an average concentration of NO3 (-) -N and NH4 (+) -N being 2.59 mg x L(-1) and 2.16 mg x L(-1), respectively, and a total inorganic nitrogen of 4.74 mg x L(-1), which exceeded the water eutrophication level (0.2 mg x L(-1)). According to the nitrogen concentration, the rainwater belonged to V and inferior V types of surface water quality. The nitrogen flux by wet deposition in the six years was 58.1 kg x hm(-2) x yr(-1), among which, NO3 (-) -N accounted for 54%. The effects of atmospheric nitrogen wet deposition on the eutrophication of the wetland water environment should be paid more attention.