FU Shu1,2, MAO Longfu1,2, LIU Hong 1,2, ZHANG Jingjing1,2, YANG Lirui1,2,
ZHOU Enmin1,2, CAO Min1,2, CAO Wenfeng1,2

（1.School of Earth Sciences, Yunnan University, Kunming 650500;
2.International Joint Research Center for Karstology, Yunnan University, Kunming 650223, China）

Abstract：In order to understand the chemical characteristics and evolution of groundwater in karst spring catchment, the chemical parameters of groundwater in Huanglong spring catchment of Aziying, Kunming city were monitored, and the chemical characteristics and recharge evolution process of groundwater in karst spring catchment were revealed by Piper diagram, Schoeller diagram, main ion ratio method and reverse hydrogeochemistry. The following results were obtained, (1) The cations in karst groundwater in Huanglong spring catchment were mainly Ca2+ and Mg2+, the anions were mainly HCO3- and SO42-, and the hydrochemical types were mainly Ca-HCO3 and Ca-Mg-HCO3; (2) The groundwater ions in spring catchment mainly came from the dissolution of calcite, dolomite and other carbonate rocks, followed by the dissolution of rock salt, sulfate and silicate and cation exchange; (3) The precipitation of calcite, dolomite, gypsum and fluorite, the dissolution of rock salt and the exchange of cations (Ca2+, Mg2+, Na+, K+) occurred along the path from recharge area (cave water) to discharge area (spring water). The chemical process of karst groundwater was affected by weathering and dissolution of carbonate minerals, ion exchange and mixed recharge. This study provides the basis for further explore the chemical characteristics and evolution mechanism of karst groundwater, and provides scientific reference for the protection and development of water resources in karst areas.

Key words：karst groundwater; hydrochemistry; ion source; reverse hydrogeochemistry; Huanglong spring catchment

EARTH AND ENVIRONMENT Vol.51, No.2, Tot No.352, 2023, Page 153