利用不同地下水埋深的地中仪进行地膜棉的灌溉试验,分析了地膜棉不同生育期时蒸发、入渗的变化特征:受地膜棉的蒸腾作用,灌溉入渗量随其日耗水量增加而显著减少;棉花根系吸水影响深度与其日耗水强度成指数关系,其根系吸水最大影响深度为2.76 m;棉花根系利用地下水量随埋深增加而减小,棉田最佳的灌水湿润深度应小于1.0 m,当灌水湿润深度超过1.5 m时,其根系不能更多利用地下水,即可认为是深层入渗。 The experiment of mulching cotton with different groundwater depths was carried out. The characteristics of evaporation and infiltration of mulching cotton at different growth stages were analyzed. The transpiration of mulching cotton and irrigation infiltration increased with daily water consumption The depth of influence of cotton root water absorption is an exponential relationship with daily water consumption intensity, the maximum depth of water absorption by root system is 2.76 m. The underground water use of cotton roots decreases with the increase of burial depth, and the optimal wetting depth of cotton field should be less than 1.0 m. When the wetting depth of irrigation exceeds 1.5 m, the root system can not make more use of groundwater, which can be considered as deep infiltration.