In order to study the characteristics of hydrochemical composition in rivers, water samples were collected in Baishui, Sanshu and Geji hydrological stations around Yulong Mountain. The results indicated that water of the three rivers is mildly alkaline with rich with Ca2+ and HCO3-. Obvious variations have been perceived during the rainy season. According to sources study of major ions, water of the three rivers were mainly influenced by precipitation and rock weathering function. The proportions of Na+, K+, Ca2+, Mg2+ and SO42- from precipitation in water are 23.44%, 9.66%, 3.10%, 17.81%, and 10.48%, respectively. In addition, the ion characteristics of river water were mainly influenced by carbonating weather. The human activities should not be ignored though its influence was little.
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