Abstract: 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·L^-1 and 2.16 mg·L^-1, respectively, and a total inorganic nitrogen of 4.74 mg·L^-1, which exceeded the water eutrophication level (0.2 mg·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·hm^-2·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.

Key words: Agricultural eco engineering, Structural divers ity, Dominance, Harmony, Xishan village