策勒河山区段河水水化学与同位素特征及补给来源OA

The Qira River,as the only source of surface runoff sustaining the Qira Oasis,plays a vital role in the sustainable development of the basin.To achieve rational development and ecological protection of water resourc-es in the Qira River Basin,this study employed hydrochemical analysis and hydrogen and oxygen stable isotope techniques to investigate the composition and hydrochemical types of major ions in water bodies of the Qira Riv-er Basin and to analyze the contributions of atmospheric precipitation,snow and ice meltwater,and spring water to river recharge.The results show that the hydrochemical types in the Qira River Basin are predominantly SO42--Na+-Cl-,influenced mainly by rock weathering processes.The δ18O values range from-11.42‰ to 4.19‰,and the δD values range from-51.38‰ to 35.40‰.IsoSource model analysis indicates that spring water is the prima-ry recharge source of the Qira River,accounting for an average proportion of 0.57 throughout the year,with a re-charge proportion as high as 0.77 in June.The contribution of snow and ice meltwater to river recharge increases markedly during summer,peaking at 0.47.Atmospheric precipitation also contributes to river recharge,showing a notable upward trend in May and August.The findings of this study can provide a scientific basis for water re-source management in the Qira River Basin.