基于水化学及氮氧同位素技术的硝酸盐来源解析——以鄱阳湖湿地为例

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Abstract In order to identify the sources, transformation and source apportionment of nitrate in Poyang lake wetland, surface water samples were collected in Poyang lake wetland, including Bang lake wetland, Shahushan wetland and Lushan wetland, in January 2019, a typical dry season. The ion composition, and nitrogen and oxygen isotope values of nitrate in the water samples were determined. Results showed that the relationship between the molar ratio of NO₃^- to Cl^- and Cl^- concentration indicated the source of nitrate mainly from agricultural activities and rainfall in the three wetlands. The range of δ¹⁵N-NO₃^- and δ¹⁸O-NO₃^- values in the three wetlands were -6.19‰~4.67‰ and 3.41‰~39.95‰, -4.14‰~1.45‰ and 31.54‰~68.30‰, -6.98‰~3.83‰ and 2.80‰~ 30.43‰, respectively. Nitrogen and oxygen isotope values of nitrate showed that the nitrate sources may be influenced by precipitation NO₃^-, nitrate nitrogen fertilizer, ammonia nitrogen fertilizer and soil organic nitrogen in the three wetlands. The relationship between nitrogen and oxygen isotopes of nitrate and the ratio relationship between NO₃^- and Cl^- suggested that there was no obvious denitrification in these wetlands. The results of SIAR model showed that the contribution of precipitation NO₃^- to nitrate sources was the largest, then followed by fertilizer and soil organic nitrogen, feces and domestic sewage was the least in three wetlands.

Key words： Poyang Lake nitrate source nitrogen and oxygen isotopes denitrification SIAR model

Received: 15 February 2022

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X52

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	LI Zhi-tao
	XIAO Hong-wei
	WU Zuo-ting
	MA Yan
	XIAO Yang-ning
	CHEN Zhen-ping
	TAO Ji-hua

Cite this article:

LI Zhi-tao,XIAO Hong-wei,WU Zuo-ting等. Hydrochemistry, nitrogen and oxygen isotope composition of nitrate to trace its source in Poyang Lake wetland[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(9): 4315-4322.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I9/4315

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