岩溶流域地表水和地下水硝酸盐来源定量识别

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Abstract

In this study, the typical agricultural area of Huaxi river basin in Guiyang city was selected as the research object. The distribution characteristics, the source and forming process of nitrate in surface and ground water were revealed by the isotopes (δ¹⁵N-NO₃^-, δ¹⁸O-NO₃^- and δ¹⁸O-H₂O) and hydrochemical analysis. Meanwhile, according to the SIAR (stable isotope analysis in R) model, the contribution rates of different nitrate sources in surface and groundwater were also identified quantitatively. The results showed that:(1) The HCO₃-Ca type was main hydrochemical types controlled by the weathering of carbonatite, and the spatial distribution characteristics of nitrate in the water were significantly affected by land use type; (2) The nitrification played a leading role in the formation of nitrate in the water, and Nitrate in the water mainly came from fertilizers, ammonia salt in rainfall, soil organic nitrogen, feces and sewage. Compared with surface water, nitrate in groundwater was more affected by feces and sewage; (3) Based on the SIAR model, the contribution rates of precipitation, fertilizer, soil organic nitrogen, and manure/sewage were 3.97%, 26.87%, 36.80% and 32.37% to nitrate in surface water and 2.83%, 13.96%, 21.03% and 62.18% to nitrate in groundwater, respectively.

Key words： multi-environmental isotopes nitrate source analysis karst basin SIAR

Received: 08 October 2019

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X523

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	Articles by authors
	ZHAO Ran
	HAN Zhi-wei
	TIAN Yong-zhu
	LI Geng
	ZENG Xiang-ying
	HE Shou-yang

Cite this article:

ZHAO Ran,HAN Zhi-wei,TIAN Yong-zhu等. Quantitative identification of nitrate source of surface water and groundwater in karst basin[J]. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(4): 1706-1714.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2020/V40/I4/1706

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