由于岩溶含水介质的不均匀性，岩溶含水系统的水文地质参数不易确定，基于地下水水化学天然示踪剂，利用多元统计方法、图解法、离子比例法等结合岩溶水文地质特征，成为地下水水化学组分的形成演化过程及影响因素研究的重要工具。文中选取北方典型岩溶裂隙含水系统，利用水文地球化学方法和统计学方法分析其地下水水化学特征及其影响因素，发现：（1）沿着地下水主径流路径，地下水水化学类型种类逐年增加，除水岩作用外影响水化学类型的Ca2+、Cl-、Na+、SO42-多来源生活污水、工业废水和生活垃圾，且地下水中挥发性有机污染物的检出及NO3-、VOCs时空输入的多变性，表明区内地下水水化学持续受到人类活动的影响；（2）利用比例系数法和因子分析法等获知影响地下水水化学的主要过程为水岩相互作用、阳离子交替吸附作用及溶滤作用，综合分析水化学类型和聚类分析可解译出监测点接收的物质组分及来源、地下水水化学动态变化过程及影响因素。

Karst aquifer medium are usually inhomogeneous, and hydrogeological parameters are hard to obtain. Using multivariate statistical method, graphic method, ions ratio method combined with karst hydrogeological conditions is an important tool to study hydrogeochemical evolution and its influencing factors. The paper used hydrogeochemical technologies and statistical methods to study groundwater chemistries’ characteristics of a typical karst water source and its influencing factors in North China. The number of groundwater hydrochemistry types was increasing with years along the main groundwater flow path. The ions of Ca2+, Cl-, Na+ and SO42- influencing groundwater hydrochemistry types come from domestic wastewater, industrial sewage and household waste besides water-rock interaction. The detection of volatile organic compounds (VOCs) and the different recharging features of NO3-, VOCs in time and space also indicated groundwater hydrochemistry affected by anthropogenic activities continuously. The mainly processes influencing groundwater environment in the study area are water-rock interaction, cation exchange and adsorption, lixiviation, human activities by using ion ratio, correlation analysis, factor analysis and other methods. Results of hydrochemistry types and cluster analysis can interpret wastewater sources of groundwater sampling points, dynamic variation processes of groundwater chemistries and their influencing factors.

P641

国家自然科学基金项目(41702277)；UNESCO/IUGS项目(IGCP 661)；桂东北岩溶系统基础地质调查(DD20190022)；广西自然科学(2017GXNSFFA198006)；中国地质科学院基本科研业务费(JYYWF20182002)。