潇河灌区地表水无机化学特征及离子来源解析

为研究潇河灌区无机水化学特征及其控制因素，本研究于2021年10月至2022年8月对潇河灌区地表水进行采样分析，综合运用相关性分析、数理统计和离子比值等方法，分析研究区地表水化学类型及离子来源特征。结果表明：研究区水化学类型主要为HCO₃-Na·Mg·Ca型，优势离子为Mg²⁺和HCO₃^-，分别占阳离子和阴离子的35.41%和68.49%。地表水体受岩石风化影响显著，离子含量的时间变化特征显著，2月和6月总溶解性固体含量最高。Ca²⁺、Mg²⁺和K⁺来源于硅酸岩风化，HCO₃^-来源于碳酸岩风化，Cl^-、SO₄^2-和NO₃^-主要受人类活动影响。

Hydro-chemical characteristics and ion source analysis of surface water in the Xiaohe irrigation area

To study the chemical characteristics and control factors of surface water in the Xiaohe irrigation area, this study sampled and analyzed the surface water from October 2021 to August 2022, and combined correlation analysis, mathematical statistics, ion ratio, and other methods to analyze the hydro-chemical types and characteristics of ion sources in the study area. The results showed that HCO₃-Na· Mg·Ca was the main hydro-chemical type, and the dominant ions were Mg²⁺ and HCO₃^-, accounting for 35.41% and 68.49% of cations and anions, respectively. The surface water was significantly affected by rock weathering, and the spatio-temporal variation of ion content was significant. Total dissolved solids content reached its highest value in February and June. Ca²⁺, Mg²⁺, and K⁺ were derived from silicate weathering, HCO₃^- was derived from the carbonatite weathering, and the sources of Cl^-, SO₄^2-, and NO₃^- were mainly affected by human activities. Thus, this study can provide a theoretical reference for water resource management and ecological restoration in agriculturally irrigated areas.