酸雨对温州三土羊湿地水体氮营养盐数量的影响

为了解酸雨对温州三羊湿地水体氮营养盐数量的影响，本文测定了三土羊湿地水体中不同形态氮的含量，其中氨氮2.90～10.75 mg·L^-1，平均538 mg·L^-1、硝态氮0.16～0.44 mg·L^-1，平均0.31 mg·L^-1；总氮34.04～63.20 mg·L^-1，平均55.75 mg·L^-1和水体的pH值，6.1～6.5，平均6.4；并测算了近两年通过降水输入到三羊湿地和三羊湿地水体中不同形态氮的数量及其占湿地现有水体中各形态氮的比例，其中输入到三羊湿地氨氮、硝态氮和总氮的量分别为2.48～2.86×10⁴ kg、2.87×10⁴～4.96×10⁴ kg和5.35×10⁴～7.82×10⁴ kg，分别占湿地水体现有量的56%～64%、11.21～19.38倍和12%～17%；直接输送到三羊湿地水体各形态氮的数量0.72×10⁴～0.84×10⁴ kg、0.83×10⁴～1.44×10⁴ kg和1.55×10⁴～2.27×10⁴,分别占现有量的16%～19%，3.24～5.63倍和3%～5%.结果表明，酸雨是三，羊湿地水体氮污染的主要来源之一，对三羊湿地水体富营养化产生重要影响.

Effects of acid rain on nitrogen content in the water body of Wenzhou Sanyang wetland

In order to understand the effects of acid rain on the nitrogen (N) content in the water body of Wenzhou Sanyang wetland, this paper measured the concentrations of different N forms in the wetland, of which, NH4+-N was 2.90-10.75 mg x L(-1), average in 5.38 mg x L(-1); NO3(-)-N was 0.16-0.44 mg x L(-1), average in 0.31 mg x L(-1); and total was 34.04-63.20 mg x L(-1), average in 55.75 mg x L(-1). The pH value was 6.1-6.5, average in 6.4. The measurement of the N input from precipitation in the past two years and its proportion to the existed N in the water body of the wetland showed that the input of NH4+-N, NO3(-)-N and total N was 2.48 x 10(4)-2.86 x 10(4) kg, 2.87-4.96 x 10(4) kg and 5.35 x 10(4)-7.82 x 10(4) kg, and its proportion was 56-64%, 11.21-19.38 times and 12%-17%, respectively. The N amount directly to the wetland water body was 0.72 x 10(4)-0.84 x 10(4) kg, 0.83 x 10(4)-1.44 x 10(4) kg and 1.55 x 10(4)-2.27 x 10(4), and its proportion was 16%-19%, 3.24-5.63 times and 3%-5%. The results indicated that acid rain was one of the main sources of pollutant nitrogen which aggravated the water pollution of the Sanyang wetland.