An analysis of nitrate sources in Nansi Lake based on nitrogen and oxygen isotopes

被引：0

作者：

Ling, Jun-Hong ^{[1
,2
]}

Zhang, Yi-Zhang ^{[1
,2
]}

Cao, Ying-Jie ^{[3
]}

Li, Xu ^{[2
]}

Zhao, Guang-Lei ^{[1
]}

机构：

[1] Chinese Research Academy of Environmental Sciences, Beijing,100012, China

[2] Research Institute for Environmental Innovation (Tianjin Binhai), Tianjin,300457, China

[3] School of Environmental Science and Engineering, Sun Yat-sen University, Guangdong,510275, China

来源：

Zhongguo Huanjing Kexue/China Environmental Science | 2023年 / 43卷 / 06期

关键词：

Alkalinity - Flood control - Lakes - Meteorological problems - Nitrogen fertilizers - River pollution - Sewage;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

The Nansi Lake of the eastern route of the South-to-North Water Diversion Project was selected as the research object. The water chemistry and distribution characteristics of different forms of nitrogen in the study area were elucidated by using δ15N-NO3- and δ18O-NO3- isotope tracing techniques and water chemistry analysis, revealing the transformation process of nitrogen and analyzing the source of nitrate. Meanwhile, according to the MixSIAR model, the contribution rates of different nitrate sources in were also identified quantitatively. There was no obvious thermocline in Nansi Lake and the water here was alkaline, the SO42--Na+ type was main hydrochemical type. Nitrate nitrogen was the main form of nitrogen in the subordinate lake. The concentration gradually decreased with the self-purification of water and the adsorption of sediment. The pollution characteristics of the rivers were consistent with that of the lake. Nitrification occurred in the process of nitrate formation, and the nitrate in the lake mainly came from domestic sewage > soil organic nitrogen > synthetic fertilizer > atmospheric deposition. Based on the MixSIAR model, the contribution ratios were 51.3%, 23.7%, 16.4% and 8.5%, respectively. © 2023 Chinese Society for Environmental Sciences. All rights reserved.

引用

页码：3100 / 3106