Film-mulched drip irrigation is an effective water-saving irrigation technology that can help to conserve soil moisture while also increasing crop yield. This study aims to disclose the effects of the water temperature on Xi’an silty loam water infiltration characteristics under film-mulched drip irrigation. The laboratory experiments were carried out with film-mulched drip irrigation by using four water temperature treatments (T = 5, 15, 25, and 35℃). The cumulative infiltration, migration distance of the wetting front, soil moisture content, and soil temperature in the wetted body were all observed. The power function models regarding the correlation among the horizontal and vertical migration distances of the wetting front, infiltration duration, and the water temperature were established. The findings indicated that water temperature had a substantial effect on the moisture content distribution and soil temperature in the wetted body. The dripper discharge and migration distance in the wetting front increased with the increase of water temperature throughout the same infiltration duration. With increasing water temperature, the average moisture content in the wetted body decreased. The temperature variation in the soil was more prominent in soil layer 0 ~ 15 cm within 400 min of infiltration. The findings of this study could be useful for the theoretical development and application for irrigation water temperature management under film-mulched drip irrigation.

覆膜滴灌是一种有效的节水灌溉技术，有助于保持土壤水分，同时提高作物产量。本研究旨在揭示水温对覆膜滴灌下西安粉质壤土渗水特性的影响。室内试验采用覆膜滴灌，采用四种水温处理（T = 5、15、25 和 35℃）。观测了湿润体的累积入渗量、湿润锋的迁移距离、土壤含水量和土壤温度。建立了湿锋水平和垂直迁移距离、入渗持续时间和水温之间相关性的幂函数模型。研究结果表明，水温对湿体中的水分含量分布和土壤温度有显着影响。在同一入渗持续时间内，随着水温的升高，湿润锋中的滴头排放和迁移距离增加。随着水温的升高，润湿体的平均含水量下降。入渗400 min内0～15 cm土层土壤温度变化更为显着。本研究结果对膜下滴灌灌溉水温管理的理论发展和应用具有重要意义。