中文关键词石期河岩溶溶丘洼(谷)地物质来源地下水化学特征氢氧同位素 英文关键词Shiqi Riverkarst hill (valley) depressionmaterial sourcegroundwater chemical characteristicshydrogen and oxygen isotopes

作者	单位	E-mail
李笑	桂林理工大学环境科学与工程学院, 桂林 541006 中国地质科学院岩溶地质研究所, 国土资源部、广西岩溶动力学重点实验室, 桂林 541004	lixiao19950207@163.com
于奭	中国地质科学院岩溶地质研究所, 国土资源部、广西岩溶动力学重点实验室, 桂林 541004	yushi@karst.ac.cn
李亮	桂林理工大学环境科学与工程学院, 桂林 541006	liliangjiaxiang@163.com
郭永丽	中国地质科学院岩溶地质研究所, 国土资源部、广西岩溶动力学重点实验室, 桂林 541004

中文摘要 为明确典型岩溶溶丘洼（谷）地区域地下水化学特征及其成因，以石期河流域为研究对象，运用Gibbs图、Piper图、端元分析及离子比例系数等方法，对地下水水化学特征及物质来源进行了定性和定量分析.结果表明，研究区内地下水pH值介于6.06~8.07之间，Ca²⁺、Mg²⁺和HCO₃^-是地下水中的主要离子，其质量浓度范围分别为2.61~108.7、0.54~27.61和8.1~370.74mg ·L^-1，符合岩溶水高钙弱碱性特征；地下水物质成分中，Ca²⁺和Mg²⁺主要受到碳酸参与的灰岩和白云岩风化作用的控制，Na⁺主要来源于硅酸盐岩的溶解，同时，Ca²⁺和Na⁺在地下水流动过程中进行阳离子交替吸附作用；K⁺、Cl^-和NO₃^-主要受到农业化肥施放和生活废水排放的影响.此外，大气降水作为该区域地下水的主要补给来源，对当地地下水化学特征和物质来源也有一定的影响. 英文摘要 To investigate the chemical characteristics of groundwater and material sources in a typical karst hill (valley) depression, 41 groundwater samples were systematically collected in the Shiqi River basin. The statistical analysis of the conventional ion content in the groundwater shows that pH of the groundwater in the study area is between 6.06-8.07, the total solid solubility is between 18.21 mg ·L^-1 and 336.28 mg ·L^-1, and the charges of anions and cations in the water body are balanced. Ca²⁺, Mg²⁺, and HCO₃^- are the main ions in groundwater, with concentrations of 2.61-108.7 mg ·L^-1, 0.54-27.61 mg ·L^-1, and 8.1-370.74 mg ·L^-1, respectively. The groundwater characteristics in the study area are consistent with the high calcium and weak alkalinity characteristics of karst water. By using the Gibbs diagram, piper diagram, end-member analysis, and ion proportional coefficient, hydrochemical characteristics and material sources of groundwater were further analyzed. The results show that Ca²⁺ and Mg²⁺ are mainly controlled by the weathering of limestone and dolomite in which carbonic acid is involved. Na⁺ mainly comes from the dissolution of silicate rocks. At the same time, Ca²⁺ and Na⁺ undergo cationic exchange adsorption in the groundwater flow process. K⁺, Cl^-, and NO₃^- are mainly affected by agricultural fertilizer application and domestic wastewater discharge. The hydrogen and oxygen isotope analysis of groundwater shows that atmospheric precipitation is the main recharge source of groundwater in this region, which impacts the chemical characteristics and material sources of local groundwater. The results of this study show that the geological background of groundwater is the main factor that affects its hydrochemical characteristics and material sources in areas with relatively little anthropogenic activity.

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