首页|裸露型岩溶区人类活动输入对地下河水化学的影响

裸露型岩溶区人类活动输入对地下河水化学的影响

Impact of Anthropogenic Activities on the Hydrochemistry of Subterranean Rivers in Bare Karst Area

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地下河是西南岩溶水的重要赋存形式,在区域人畜供水中发挥重要作用,裸露型岩溶区因其特殊水文地质结构,地下河易受到人类活动输入的影响.利用水文地球化学分析、水化学演化图(Hydrochemical Facies Evolution Diagram,HFE-D)、环境同位素辨析等多手段研究人类活动输入对开阳地下河水化学的影响.结果表明:阴阳主要离子分别是HCO-3、SO24-和Ca2+、Mg2+,水化学类型为HCO3-Ca·Mg,主要受控于岩石风化控制,但地下河系统中SO42-、NO3-及Cl-受到南部县城、垃圾填埋场和渣场输入的影响.HFE-D发现地下河下游始终处于受影响状态,δ34S-SO42-同位素表明SO42-主要来源生活污水输入(71％),其次是大气降雨(22％).δ15N-NO3--δ18O-NO3-同位素计算显示NO3-;主要来源于污水排放(42％)、大气降雨(37％)和农业输入(21％),地下河系统的开放性不利于氮素的反硝化降解.
Subterranean rivers are an important form of karst water in southwestern China,playing a significant role in local water sup-ply for humans and animals.However,subterranean river systems in bare karst areas are susceptible to human activities due to unique hydrogeological structures.Multiple research methods,such as the Hydrochemical Facials Evolution Diagram(HFE-D)and environ-mental isotope analysis,were applied to investigate the effects of human activities on the hydrochemistry of the subterranean river at Kaiyang.The results show that the dominant anions and cations in the groundwater were HCO3-and SO42-,Ca2+and Mg2+respectively,with the hydrochemical type being HCO3-Ca·Mg,mainly controlled by water-rock interaction.The SO42-,NO3-and Cl-in the subter-ranean river system is impacted by the activity from the southern county,landfill and slag yard.The HFE-D indicated that the down-stream section of the subterranean river was consistently affected by anthropogenic activities,and δ34S-SO42-isotopes suggest that sewage input accounts for the majority(71％)of the SO42-source,followed by atmospheric precipitation(22％).Isotope calculations for δ15N-NO3-and δ18O-NO3-indicate that NO3-is mainly sourced from sewage discharge(42％),atmospheric precipitation(37％),and agricul-tural inputs(21％).The openness of the bare karst subterranean river system hinders removal of nitrogen by denitrification.

bare karst underground riverhydrochemistryHFE-Denvironmental isotopesanthropogenic activities

王荷英、吴贻创、杨应增、何守阳、吴攀、罗维

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喀斯特地质资源与环境教育部重点实验室(贵州大学),贵阳 550025

贵州大学资源与环境工程学院,贵阳 550025

贵州喀斯特环境生态系统教育部野外科学观测研究站,贵阳 550025

贵州大学北阿拉巴马大学国际工程技术学院,贵阳 550025

贵州省地质环境监测院,贵阳 550004

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裸露岩溶地下河 水化学 水化学相演化图 环境同位素 人类活动

国家重点研发计划国家自然科学基金项目国家自然科学基金项目贵州省自然科学基金项目贵州省自然科学基金项目

2022YFC37050004176301942267014黔科合JZ字2006号黔科合基础-ZK[2024]重点018

2024

10.14050/j.cnki.1672-9250.2024.52.004

地球与环境
中国科学院地球化学研究所

地球与环境

CSTPCD北大核心
影响因子：0.875
ISSN：1672-9250
年,卷(期)：2024.52(4)
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