赣州北部丘陵地区地下水溶质溯源及评价OA

[Objective]The hilly area of northern Ganzhou has a high degree of groundwater development and utilization and is significantly affected by human activities.To clarify the main sources of groundwater solutes,the impact of human activities on groundwater,and the suitability of groundwater for drinking and irrigation in this region,and to provide a scientific basis for the scientific development and protection of regional groundwater resources.[Methods]Taking the groundwater in the hilly area of northern Ganzhou as the research object,based on spatial groundwater sampling,comprehensive methods such as statistical analysis,ion comparison,water-rock interaction analysis,and water quality evaluation were applied to systematically conduct the research.[Results]① The main cations in groundwater from wells and springs in the study area are Ca2+and Na+,and the dominant anion is HCO3-.① The main cations in well and spring groundwater in the study area are Ca2+and Na+,and the main anion is HCO3-.The concentrations of major ions in wells are higher than in springs,indicating significant interference from human activities.② The chemical composition of groundwater is primarily controlled by the weathering of silicate minerals,and the groundwater has a strong mineral dissolution capacity.③ The main source of groundwater pollution in the area is fertilizer contamination,with some well points also experiencing superimposed effects from domestic pollution and fecal contamination.④ Evaluation using the Water Quality Index(WQI)method shows that the overall groundwater quality in the area is good and meets drinking water requirements.Evaluations based on indicators such as Soluble Sodium Percentage(SSP),Sodium Adsorption Ratio(SAR),and Permeability Index(PI)indicate that the sodium hazard for irrigation is relatively weak,but long-term use may reduce soil permeability.[Conclusion]The sources of groundwater solutes in the study area are influenced by both natural geological processes and human activities.Among natural factors,the weathering of silicate minerals is the dominant factor controlling the hydrochemical composition of groundwater.Among anthropogenic factors,fertilizer use is the main source of groundwater solutes.The groundwater generally meets basic requirements for drinking and irrigation.However,the relatively high ion concentrations in wells and the potential negative impact of long-term irrigation on soil permeability require focused attention.It is recommended to strengthen precise control and scientific utilization guidance for regional groundwater pollution to ensure the sustainable use of groundwater resources.