基于水化学与氮氧同位素的喀斯特山区水体硝酸盐来源示踪与估算——以平寨水库为例

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Abstract Pingzhai reservoir is located in the karst mountainous area. It is one of the important irrigation and drinking water reservoirs in Guizhou province, the water environment quality has a profound impact on the production and life of residents. Taking Pingzhai reservoir as the research object, this essay adopted hydrochemical analysis method, nitrogen and oxygen dual isotope technology combined with MixSIAR model to quantitatively identify the contribution rate of each pollution sources of nitrate in the water body of the study area. The results showed that:(1)Dissolved inorganic nitrogen in rivers and reservoir water bodies mainly exists in the form of nitrate nitrogen, which is manifested in time as flat season>wet season>dry season. In space, there is a significant difference in concentration in the upstream of each river, while the concentration in the downstream is close to that in the reservoir area. The nitrate concentration in the wet season before the dam is relatively high.(2)The conversion of nitrate in the water body of the research area is mainly through nitrification. The main sources are domestic sewage, livestock manure, and soil organic nitrogen during the dry and flat seasons, while chemical fertilizers are the mail sources during the wet season. (3) In terms of nitrate sources, the contribution rates of domestic sewage and livestock manure in the reservoir area were higher than that of rivers, and the contribution rates of soil organic nitrogen and chemical fertilizer were lower than that of rivers. In terms of contribution rates of domestic sewage and livestock manure, the numbers are 59.3% and 70.8% in the dry season of rivers and reservoirs respectively, and 58.3% and 72.6% respectively during the normal water period of rivers and reservoirs. And the number is quite small during wet season. From the perspective of soil organic nitrogen contribution rate and chemical fertilizer contribution rate, the contribution rate during the wet season is higher than that during the dry and flat season. The contribution rates of soil organic nitrogen from rivers and reservoirs during the wet season are 35.1% and 32.8% respectively, and the contribution rates from chemical fertilizers are 36.4% and 30.7% respectively. The protection of water environment quality in Pingzhai Reservoir should focus on strengthening the control of domestic sewage discharge for urban and rural residents, especially the reduction of the discharge of domestic sewage and improvement of centralized sewage treatment of the Nayong River basin. Besides, in order to protect the water environment, it is necessary to enhance the prevention and control of agricultural pollution in various watersheds, reasonably dispose of the discharge and stacking of livestock and poultry manure from individual livestock breeding in each watershed, avoid pollutants from entering the water body and causing pollution, and provide guarantees for the safety of drinking water and ecological protection of residents.

Key words： karst mountainous area nitrate source hydrochemical characteristics Nitrogen and oxygen isotope MixSIAR model Pingzhai Reservoir

Received: 27 February 2023

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X142

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	WANG Yan-bi
	ZHOU Zhong-fa
	KONG Jie
	WANG Cui
	ZOU Yan
	ZHANG Fu-qiang
	LI Li

Cite this article:

WANG Yan-bi,ZHOU Zhong-fa,KONG Jie等. Tracing and estimation of nitrate sources based on hydrochemistry and nitrogen and oxygen isotopes in karst mountainous water: A case study of the Pingzhai reservoir[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(10): 5265-5276.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I10/5265

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