Shallow groundwater has a great influence on crop growth. However, few studies have investigated the impact of different groundwater depth on crop growth. This paper mainly discusses the impact of the groundwater depth on summer maize growth and the groundwater contributions to summer maize evapotranspiration and yield via the AquaCrop crop growth model. Numerical simulation results showed that summer maize growth and soil water in the Shijin irrigation district were highly related to the groundwater depth. With the depletion of the groundwater, the crop coefficient, crop actual transpiration, crop yield and crop water-use efficiency tended to increase and then decrease. Considering the groundwater contribution, maize yield and water-use efficiency, the suitable groundwater table depth for summer maize growth in the Shijin irrigation district was 1.5 m, and the groundwater contribution was 58.8 % in this case. Thus, discussing the impact of groundwater on crop growth is highly pertinent, as it is important for arranging irrigation schedules.

浅层地下水对作物生长有很大影响。但是，很少有研究调查不同地下水深度对作物生长的影响。本文主要通过AquaCrop作物生长模型讨论了地下水深度对夏季玉米生长的影响以及地下水对夏季玉米蒸散和产量的贡献。数值模拟结果表明，石津灌区夏季玉米生长和土壤水分与地下水深度高度相关。随着地下水的枯竭，农作物系数，农作物实际蒸腾量，农作物产量和农作物水分利用效率有先升高后降低的趋势。考虑到地下水的贡献，玉米的产量和用水效率，在石津灌区，夏玉米生长的适宜地下水位深度为1.5 m，在这种情况下，地下水贡献率为58.8％。因此，讨论地下水对农作物生长的影响非常重要，因为这对安排灌溉计划很重要。