Sampling and testing were conducted on the groundwater level depth, soil water content, and vegetation coverage in the delta oasis of the WeiGan-KuChe River Basin, and a method for analyzing soil water balances for groundwater-dependent vegetation (GDV) was developed using the soil water balance model with the Richards equation. Three typical observation points (sites A, B, and C) were selected to understand the relationship between plant transpiration, soil water content changes, and groundwater level depth via HYDRUS-1D model simulations. The model calibration results showed that the simulated water contents at each site and in each soil layer fit well with the measured data and the comparison results of each sites are R²_A = 0.81, R²_B = 0.89, R²_C = 0.78, in respectively. The soil water balance model of the three different sites demonstrated that vegetation transpiration was related to the groundwater level depth, vegetation cover, and plant age (P. euphratica). According to field observations within the WeiGan-KuChe River delta oasis, the groundwater level depth influenced the soil moisture and soil salinity, which are the most important environmental factors determining the distribution and changes in GDV. When the groundwater level depth was below 1 m or above 6 m, the plant species occurrence frequency decreased by 10%, and the degree of land desertification was severe. These simulations and field investigation results showed that the groundwater level threshold for salinity control was approximately 1 m, the ecological warning threshold varied by approximately 5 m, and the preferred groundwater level for GDV growth varied between 2 and 4 m. The findings of this study have important implications for groundwater resource management and ecological preservation in arid and semiarid areas.

对渭干库车河流域三角洲绿洲的地下水位深度，土壤含水量和植被覆盖进行了采样和测试，并提出了一种利用地下水依赖植被分析土壤水分平衡的方法。理查兹方程的土壤水分平衡模型。通过HYDRUS-1D模型模拟，选择了三个典型的观察点（地点A，B和C）来了解植物蒸腾作用，土壤含水量变化和地下水位深度之间的关系。模型标定结果表明，每个站点和每个土壤层的模拟含水量与实测数据吻合得很好，每个站点的比较结果分别为R ² _A  = 0.81，R ² _B  = 0.89，R² _℃ 分别为0.78。三个不同地点的土壤水平衡模型表明，植被蒸腾与地下水位深度，植被覆盖度和植物年龄（P. euphratica）有关。根据渭干库车河三角洲绿洲的实地观察，地下水位深度影响土壤水分和盐分，这是决定GDV分布和变化的最重要环境​​因素。当地下水位深度小于1 m或6 m以上时，植物物种的发生频率降低10％，土地沙漠化程度严重。这些模拟和现场调查结果表明，盐度控制的地下水水位阈值约为1 m，生态警告阈值变化约5 m，GDV生长的首选地下水位在2-4 m之间。这项研究的发现对干旱和半干旱地区的地下水资源管理和生态保护具有重要意义。