上海地区氮素湿沉降及其对农业生态系统的影响

Nitrogen in wet deposition in Shanghai area and its effects on agriculture ecosystem

  • 摘要: 试验研究上海地区N素湿沉降及其对农业生态系统的影响结果表明,上海地区湿沉降中N营养盐含量较高,其中NO-3为2.587mg/L,NH+4达2.155mg/L,TIN的含量均在4.000mg/L以上。湿沉降输入到上海地区农业生态系统N营养盐的年通量较高,其中NH+4平均为26.580kg/hm2,1999年达到38.930kg/hm

    Abstract: N is the necessary nutrition for plant growth and NH4+,NO3- are two major forms when N is absorbed by plants. NH4+ and NO3- in wet deposition are two very important factors to compensate the N loss of agricultural ecosystem. In order to learn the situation of N in the wet deposition of Shanghai District and its effects on agricultural ecosystem in this area, the amount, forms and ecological effects of N in the wet deposition were studied. Results show that in recent years, the content of N nutrition in the precipitation is fairly high in the region, among which NO3-> is 2.587mg/L,NH4+ 2.155mg/L and TIN more than 4.000mg/L. The N imported to the agriculture ecosystem of the area by wet deposition is abundant, with 26.580kg/hm2·a NH4+. In 1999, NH4+ was 38.930kg/hm2, NO3- was 31.545kg/hm2. The average annual TIN imported from wet deposition is 58.123kg/hm2·a equal to 124.549kg/hm2·a CO(NH2)2 or 327.980kg/hm2·a NH4HCO3 and in 1999 the quantity of TIN was 77.750kg/hm2 equal to 166.607kg/hm2 CO(NH2)2 or 438.732kg/hm2 NH4HCO3, accouting for 35% of the national average application amount of fertilizer(N) in 1998.

     

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