Hydrogeochemical Characteristics and Controlling Factors of the Karst Ground water in the Area of Fuyuan,Estern Yunnan
The karst groundwater is an important source of water supply for industrial and agricultural production and domestic drinking water of residents in the area of Fuyuan,Eastern Yunnan.In order to support the rational development,utilization and protection of karst groundwater resources,68 groups of karst groundwater samples were systematically collected in Fuyuan.The chemical character-istics,hydrogen and oxygen isotopes and influencing factors of karst groundwater were studied by comprehensive use of water chemical analysis,hydrogen and oxygen isotope analysis,multivariate statistical analysis and other methods.The results indicate that the average pH value of karst groundwater in the study area is 7.69,which is generally weakly alkaline.The hydro-chemical types are mainly HCO3-Ca and HCO3-Ca·Mg,with a small portion being HCO3·SO4-Ca·Mg.Except for Ca2+and HCO3-,all other major ions exhibit strong spatial variability.The mass concentration of Sr in karst groundwater in the area is 30.00-3 150.00 µg/L,with an average val-ue of 522.38 µg/L.Among them,40 karst groundwater samples meet the boundary standard for strontium mineral water.In addition,some samples have high levels of Fe,Mn and Al,exceeding the Class Ⅲ water quality standard.The karst groundwater in the area is mainly supplied by local atmospheric rainfall,and the solute components are mainly affected by dissolution of carbonate rocks,human activities and the cation exchange reaction,but the cation exchange effect is generally weak.Ca2+,Mg2+,HCO3-and Sr mainly come from the dissolution of carbonate minerals.Cl-,K+and Na+mainly come from domestic sewage.Fe,Mn,Al and SO42-mainly come from acidic wastewater generated by coal mining activities.NO3-mainly come from agricultural fertilization activities.Factor analysis shows that the contribution rates of carbonate rock dissolution,domestic sewage discharge,coal mining activities,and agricultural ferti-lization to the hydrochemistry of karst groundwater are 45.85％,22.24％,21.51％and 10.40％,respectively.This indicates that hu-man activities have an undeniable impact on karst groundwater quality,and targeted prevention and control measures are needed.
karst groundwaterhydrogeochemical characteristicscontrolling factorsfactor analysisarea of Fuyuan,Eastern Yunnan
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