大连地区湿沉降氮量浅析

An Initial Study on Wet Deposition of Nitrogen in Dalian

采用雨量器收集雨水和流动分析仪测定雨水含氮量的方法,研究大连地区大气湿沉降的氮浓度与降水量的关系。结果表明:NH4+-N、NO3--N浓度与降水量有较好的负相关(相关系数分别为r=-0.5043和r=-0.5655),NO3--N浓度受降雨量影响较大;氮沉降量、降水量季节性差异明显,NH4+-N沉降量、降水量均在夏季最大,冬季最小,NO3--N沉降量在春季最大,冬季最小;NH4+-N的月沉降量受降水量与频次两方面的影响(相关系数分别为r=0.8552,r=0.6458),受降水量影响更大;NO3--N沉降量受降水量与降水频次影响较小(相关系数分别为r=0.6140,r=0.3593)。

The relationship of nitrogen concentation in atmospheric wet deposition,nitrogen deposition amount and rainfall in Dalian were researched.The results showed that the negative correlation of the concentration of NH4+-N and NO3——N with the rainfall amount was quite explicit(correlation coefficients r=-0.5043 and r=-0.5655,respectively),the rainfall amount had an obvious effect on NO3——N concentration.Seasonal variety was prominent in deposition amount of nitrogen and rainfall,both the rainfall amount and the NH4+-N deposition amount were the most in summer,while the least in winter.For NO3——N,the deposition amount was the most in spring,and the least in winter;the monthly amount of rainfall and the monthly frequency of rainfall influenced monthly average deposition amount of NH4+-N(correlation coefficients r=0.8552**,r=0.6458**,respectively),the rainfall amount had more important action;but for NO3——N,the monthly amount of rainfall and monthly frequency of rainfall had a little function(correlation coefficients r=0.6140**,r=0.3593,respectively).