青土湖区是腾格里沙漠和巴丹吉林沙漠之间重要的生态屏障，1950s青土湖干涸导致了一系列严重的生态问题，其生态风险极高，因此在政府主导下于2010年开始向青土湖地区注入生态用水，但是目前生态输水的水文效应还不明朗，开展生态输水对水文过程的影响研究非常有必要。本研究拟选取石羊河尾闾青土湖区域为研究区，基于稳定同位素和水化学方法，通过对输水前、中、后期的青土湖集水区及周边区域地表水、地下水、土壤水等要素进行系统的观测研究，定量识别青土湖区域不同水体的水分补给来源和水体之间的相互联系及转化关系。研究可揭示生态输水对干旱区尾闾湖区域水文过程的影响，提升对生态输水水文效应的认知水平，对石羊河流域生态建设及水资源的综合管治和合理利用具有现实意义。

As an important ecological barrier, the Qingtu Lake region located in the middle of the Tengger and Badan Jaran Desert. Qingtu Lake drying up caused a series of serious ecological problems, and its ecological risk is extremely high. Therefore, ecological water has been injected into the Qingtu Lake area since 2010, but the hydrological effects of the ecological water transport are not clear. Therefore, it is necessary to carry out ecological water transport and its impact on hydrological processes. In this study, the Qingtu Lake area is selected as the study area. Based on the stable isotope and water chemistry methods, surface water, groundwater, and soil water in the Qingtu Lake catchment area are selected. The water recharge sources and water bodies in the different regions of the Qingtu Lake area are quantitatively identified. The study can reveal the impact of ecological water transport on hydrological processes in the arid lake region, to understand hydrological effects of ecological transport, and have realistic implications for the ecological construction of the Shiyang River Basin, the comprehensive control and rational use of water resources.