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

作　　者：王荷英 吴贻创 杨应增 何守阳 吴攀[1,2] 罗维 WANG Heying;WU Yichuang;YANG Yingzeng;HE Shouyang;WU Pan;LUO Wei(Key Lab of Karst Georesources and Environment of Ministry of Education,Guizhou University,Guiyang 550025,China;College of Resources and Environmental Engineering,Guizhou University,Guiyang 550025,China;Guizhou Karst Environmental Ecosystems Observation and Research Station,Ministry of Education,Guiyang 550025,China;North Alabama International of College of Engineering and Technology,Guizhou University,Guiyang 550025,China;Guizhou Geo-environment Monitoring institute,Guiyang 550004,China)

机构地区：[1]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 [2]贵州大学资源与环境工程学院,贵阳550025 [3]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 [4]贵州大学北阿拉巴马大学国际工程技术学院,贵阳550025 [5]贵州省地质环境监测院,贵阳550004

出　　处：《地球与环境》2024年第4期466-478,共13页Earth and Environment

基　　金：国家重点研发计划(2022YFC3705000);国家自然科学基金项目(41763019、42267014);贵州省自然科学基金项目(黔科合JZ字2006号,黔科合基础-ZK[2024]重点018)。

摘　　要：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)^(-)、SO_(4)^(2-)和Ca^(2+)、Mg^(2+),水化学类型为HCO_(3)-Ca·Mg,主要受控于岩石风化控制,但地下河系统中SO_(4)^(2-)、NO_(3)^(-)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,δ^(34) S-SO_(4)^(2-)同位素表明SO_(4)^(2-)主要来源生活污水输入(71%),其次是大气降雨(22%)。δ^(15) N-NO_(3)^(-)-δ^(18) O-NO_(3)^(-)同位素计算显示NO_(3)^(-)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 supply 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 environmental 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 HCO_(3)^(-) and SO_(4)^(2-),Ca^(2+)and Mg^(2+)respectively,with the hydrochemical type being HCO_(3)-Ca·Mg,mainly controlled by water-rock interaction.The SO_(4)^(2-),NO_(3)^(-) and Cl^(-)in the subterranean river system is impacted by the activity from the southern county,landfill and slag yard.The HFE-D indicated that the downstream section of the subterranean river was consistently affected by anthropogenic activities,and δ^(34) S-SO_(4)^(2-) isotopes suggest that sewage input accounts for the majority(71%)of the SO_(4)^(2-) source,followed by atmospheric precipitation(22%).Isotope calculations for δ^(15) NNO_(3)^(-) and δ^(18) O-NO_(3)^(-) indicate that NO_(3)^(-) is mainly sourced from sewage discharge(42%),atmospheric precipitation(37%),and agricultural inputs(21%).The openness of the bare karst subterranean river system hinders removal of nitrogen by denitrification.

关 键 词：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 

分 类 号：P641.3[天文地球—地质矿产勘探]