基于氮氧同位素的南四湖硝酸盐来源解析

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Abstract 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 SO₄^2--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.

Key words： δ¹⁵N-NO₃^-and δ¹⁸O-NO₃^- nitrate source analysis Nansi Lake MixSIAR

Received: 16 November 2022

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X524

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	LING Jun-hong
	ZHANG Yi-zhang
	CAO Ying-jie
	LI Xu
	ZHAO Guang-lei

Cite this article:

LING Jun-hong,ZHANG Yi-zhang,CAO Ying-jie等. An analysis of nitrate sources in Nansi Lake based on nitrogen and oxygen isotopes[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(6): 3100-3106.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I6/3100

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