Analysis of the evolution and causes of groundwater chemistry after ecological water replenishment of the Jialu River, China.

Evaporation intensifies salt accumulation, resulting in an increasing trend of TDS in groundwater along the river flow direction.

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From a temporal perspective, compared with 2015, the high-concentration area of K + in groundwater gradually decreased in 2019, and the overall concentration of K + showed a decreasing trend.

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The HCO 3 − concentration varies irregularly over time, showing an overall trend of first decreasing and then increasing.

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