大同盆地地下水硝酸盐分布特征及来源解析

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Abstract This study delved into the origins and transformation processes of nitrate in the groundwater of the Datong Basin, utilizing hydrochemical analysis alongside multi-isotope techniques (δ¹⁸O-H₂O, δ¹⁵N-NO₃^- and δ¹⁸O-NO₃^-). With the MixSIAR model, we quantitatively assessed the contribution of various pollution sources. Research results are as follows, the mean concentrations of NO₃^--N, NO₂^--N and NH₄⁺-N in groundwater were found to be 32.07,0.96和0.61mg/L, respectively, with NO₃^--N being the most prevalent. Remarkably, the peak concentration of NO₃^--N soared to 538.61mg/L, surpassing the Class III groundwater quality benchmark (20mg/L) by a staggering 27 times, with a 39.13% exceedance rate. The NO₃^--N concentration decreased as groundwater depth increased: shallow groundwater averaged at 34.26mg/L, middle groundwater at 22.05mg/L, and deep groundwater at 13.07mg/L. Nitrogen transformation in groundwater was primarily driven by nitrification, whereas denitrification played a minor role. The primary culprits behind nitrate pollution in groundwater were identified as sewage and manure, soil nitrogen and chemical fertilizers. Their respective average contribution rates were as follows: in shallow groundwater, sewage and manure accounted for 33.6%, followed by soil nitrogen at 33.5% and chemical fertilizers at 21.5%. For middle groundwater, the rates were 43.3% for sewage and manure, 34.4% for soil nitrogen, and 18.1% for chemical fertilizers. In deep groundwater, soil nitrogen led with 54.4%, chemical fertilizers followed at 25.1%, and sewage and manure contributed 18.5%. An uncertainty analysis revealed that the contribution rates of chemical fertilizers and soil nitrogen carried significant uncertainty, indicated by their relatively high UI₉₀values. The research results provide a reference for understanding nitrogen transformation and identifying pollution sources in groundwater.

Key words： groundwater nitrate nitrification nitrogen transformation bayesian isotope mixing model

Received: 01 August 2024

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X523

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	GE Qin
	ZHANG Jun-peng
	WANG Yang
	WANG Hui-man
	SHAO Zheng
	LI Xiang
	LIU Hai-yan
	LI Xin-yan

Cite this article:

GE Qin,ZHANG Jun-peng,WANG Yang等. Distribution characteristics and source analysis of nitrate in groundwater of Datong Basin[J]. CHINA ENVIRONMENTAL SCIENCECE, 2025, 45(2): 1004-1015.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2025/V45/I2/1004

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