岩溶洞穴水中硝酸盐浓度变化及其来源与估算

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Abstract Nitrate (NO₃^-) pollution of groundwater caused by anthropogenic activities has become a significant environmental problem with global concern. Accurate identification of mixing sources of NO₃^- pollution in aquatic environments is the key to controlling NO₃^- input and improving water quality. To clarify the distribution of NO₃^- in karst cave water, this paper selects Mahuang Cave as the research object. A comprehensive analysis of the cave hydrochemistry, the variation characteristics and sources of NO₃^- and the biogeochemical processes by using the hydrochemical methods and stable isotope values, the results showed that the pH of the water was 8.36 on average, and the main anions and cations were mainly HCO₃^-, Ca²⁺ and Mg²⁺, respectively. The hydrochemical type was Ca·Mg-HCO₃ type, and the water was weakly alkaline. The δD-H₂O and δ¹⁸O-H₂O values were distributed near the local atmospheric precipitation line equation, indicating that atmospheric precipitation was the primary source of cave water recharge. The seasonal variation of NO₃^-concentration in the water was stable, with average values of 13.46mg/L and 13.93mg/L in the dry and wet seasons, respectively. The water quality met the class II water standard (in terms of N). The ratio of [NO₃^-] and [Cl^-] and the isotopic values of NO₃^- indicated that fertilizer, soil N, manure&sewage, and atmospheric deposition were the mixing sources of NO₃^- in water. The process of NO₃^- conversion in water was dominated by microbial nitrification, and no significant denitrification occurred. The results estimated from the SIAR model showed that the average contribution rates of mixing pollution sources to the NO₃^-content in water during dry and wet seasons were CF(55%), SN(24%), M&S(12%), AD(8%), and CF (52%), SN (24%), M&S (19%), AD (5%), respectively, where CF and SN were the mainly contributing sources of nitrate concentration in the study area, followed by M&S and AD.

Key words： groundwater Mahuang Cave isotope nitrate hydrochemistry SIAR model

Received: 06 April 2023

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	SU Dan
	ZHOU Zhong-fa
	GONG Xiao-huan
	DING Sheng-jun
	DONG Hui
	YAN Li-hui
	XIONG Yong

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SU Dan,ZHOU Zhong-fa,GONG Xiao-huan等. Variation of nitrate concentration in karst cave water and its sources and estimation[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(11): 5812-5822.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I11/5812

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