Concentration, Flux, and Emission Factor of N 2 O in Rivers with Different Nitrogen Pollution Features

被引：3
|
作者：
Wang M. [1 ,2 ]
Li Y.-F. [1 ]
Lei K. [2 ]
Yang L.-B. [2 ]
机构：
[1] School of Municipal and Environmental Engineering, Shenyang Construction University, Shenyang
[2] Institute of Water Environmental Research, Chinese Research Academy of Environmental Science, Beijing
来源：
Huanjing Kexue/Environmental Science | 2018年 / 39卷 / 12期
关键词：
Emission factor; Flux; N pollution; N [!sub]2[!/sub] O; River;
D O I：
10.13227/j.hjkx.201803082
中图分类号：
学科分类号：
摘要：
In this study, 22 rivers in Tieling City were selected to study the concentration, flux, and emission factor (EF 5r ) of N 2 O. Based on the concentrations and components of nitrogen (N), the 22 rivers can be divided into ammonia nitrogen (NH 4 + )-polluted rivers (mean NH 4 + =5.86 mg•L -1 ), nitrate nitrogen (NO 3 - )-polluted rivers (mean NO 3 - =3.05 mg•L -1 ), and N-limited rivers [mean DIN (NH 4 + + NO 3 - )=1.04 mg•L -1 ]. Overall, the concentration of N 2 O ranges from 17.03 to 9 028.60 nmol•L -1 , with a mean value of 546.75 nmol•L -1 (mean saturation=6 256%). The emission fluxes across the water-air interface range from 17.21 to 15 655.3 μg•(m 2 •h) -1 , with a mean value of 949.36 μg•(m 2 •h) -1 , indicating that those rivers are net sources of atmospheric N 2 O. The concentration and flux of N 2 O observed in NH 4 + -polluted rivers are significantly higher than that in the NO 3 - -polluted and N-limited rivers. According to the method proposed by the IPCC, EF 5r varies greatly among the three types of rivers and the coefficient of variation of EF 5r is 445%. The EF 5r for NO 3 - -polluted rivers is on average 0.0005, which is lower than the recommended value of 0.002 5. However, the EF 5r for NH 4 + -polluted rivers is on average 0.445 6, which is 180 times the recommended value and may be caused by the lower NO 3 - concentration of those rivers. The EF 5r of N-limited rivers averages 0.005 0 and is two times the recommended value. Thus, it is necessary to assess the pollution status of N before calculating the EF 5r for the riverine system. We suggest that the EF 5r for NH 4 + -polluted and N-limited rivers should be calculated using [N 2 O]/[NH 4 + ] and [N 2 O]/[DIN], respectively, without assessing the composition and concentration of N. © 2018, Science Press. All right reserved.
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页码：5400 / 5409
页数：9
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