<b>Controlling Factors of Surface Water Ionic Composition Characteristics in the</b> Lake Genggahai Catchment, NE Qinghai–Tibetan Plateau, China
Yanxiang Jin | Xin Jin | Dengxing Yang | Xufeng Mao
This study has determined the major ion compositions of surface waters within the basin of Lake Genggahai, northeastern Qinghai−Tibetan Plateau, China. The results showed that the anions in the groundwater and river water of Genggahai Lake are mainly HCO<sub>3</sub><sup>−</sup>, and the cations are mainly Ca<sup>2+</sup> + Na<sup>+</sup>. Evaporite, carbonate, and silicate in the basin all have an impact on the chemical composition of river water and groundwater. Among them, carbonate weathering has a relatively larger contribution. The grazing activities of herdsmen in the basin have had a certain degree of impact on the water quality of river basins and groundwater. The anion of lake water is dominated by Cl<sup>−</sup>, and the cation is mainly Na<sup>+</sup>. The content change is mainly affected by the change of corresponding ion content in groundwater coming into the lake and the evaporation of lake water. Among them, Cl<sup>−</sup> in lake water is more affected by the change of Cl<sup>−</sup> content in the groundwater coming into the lake, while Na<sup>+</sup> in lake water is more affected by evaporation. More specifically, the low concentrations of Ca<sup>2+</sup> and HCO<sub>3</sub><sup>−</sup> in lake water were determined to be related to the photosynthesis of aquatic plants in the lake.
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