车尔臣河流域农业用水比例过高，水资源供需矛盾突出，明确其农田灌溉用水与地下水化学特征对流域水资源配置和绿洲水生态安全具有重要意义。采用野外调查、数理统计与水化学分析法，对车尔臣河流域平原区地下水、渠水和河水的水化学及稳定氢氧同位素特征进行分析，并探讨了农田灌溉水与地下水间的相互作用关系。结果表明：（1）河水、渠水与地下水均呈弱碱性，且存在F^-含量超标现象，主要水化学类型均为SO₄·Cl-Na型，优势阴阳离子均为SO₄^2-和Na⁺。渠水和地下水均有咸化趋势，河水的水质总体相对较好。（2）地下水、河水和渠水的水化学特征相近，其离子来源均受到岩石风化作用控制，地下水的离子来源同时还受到蒸发浓缩作用影响。（3）河水、渠水和地下水的水线斜率分别为3.70、0.61和1.42，均低于当地大气降水线斜率（5.62），且各水体样点集中分布于大气降水线下方，说明河水和渠水均与地下水的水力联系十分密切，二者均是浅层地下水的重要补给来源，补给比例分别为56.48%和43.52%。研究结果可为车尔臣河流域平原灌区水资源的高效利用及合理配置提供科学依据。

Agricultural water constitutes a significant proportion of total water consumption in the Qargan River Basin. The imbalance between water supply and demand in this region has become increasingly prominent. Understanding the hydrochemical characteristics of irrigation water and groundwater in the Qargan River Basin is crucial for effective water resource allocation and ecological security within the oasis. This study examines the hydrochemical parameters, as well as the stable isotopic compositions of hydrogen and oxygen, in river water, channel water, and groundwater from the plain areas of the basin. Data were collected through field investigations, mathematical statistical analyses, and hydrochemical methods to explore the interaction between irrigation water and groundwater. The key findings are as follows: (1) River water, channel water, and groundwater are all weakly alkaline, with elevated fluoride content in each. The predominant hydrochemical type for all water bodies is SO₄·Cl-Na, with SO₄^2- and Na⁺ as the dominant anion and cation, respectively. Groundwater and channel water show trends of salinization, whereas the river water quality is comparatively better. (2) The three water bodies exhibit similar hydrochemical characteristics. Ion sources in river water and channel water are primarily controlled by rock weathering, while groundwater is influenced by both rock weathering and evaporative concentration. (3) The slopes of the river water, channel water, and groundwater lines are 3.70, 0.61, and 1.42, respectively, which are lower than the slope (5.62) of the local meteoric water line (LMWL). Additionally, nearly all sampling sites for the three water bodies are distributed below the LMWL in a relatively compact manner. This suggests that river and channel waters are closely hydrologically connected to groundwater and act as the primary recharge sources, contributing 56.48% and 43.52%, respectively, to groundwater replenishment.