Improving water use efficiency is an effective way to conserve water in agriculture. Drip irrigation is a water-saving irrigation technology that has been adopted worldwide. Film mulching can prevent undesired water vaporization losses and enhance soil surface temperature. This study used a meta-analysis to assess the effects of mulching on crop yield (CY) and water use efficiency (WUE) under drip irrigation to determine whether a superposition effect occurs when combining film mulching and drip irrigation and whether the limiting factors of film mulching play a positive role in agricultural production. The results showed that film-mulching drip irrigation (FMDI) increased CY and WUE by about 20% and 30%, respectively, compared with nonmulching drip irrigation (NMDI). These improvements were affected by climatic conditions (climate), soil conditions (SC), crop type (CT), water consumption (WC), and mulching material (MM). For climate, film mulching was most effective in areas with temperature (Te) values below 10 °C and rainfall (RF) less than 400 mm, increasing CY by 17.6% and WUE by 16.2%. For SC, FMDI improved CY and WUE the most in medium-textured (loam) soil types with less than 17% plant available water capacity. As water consumption increased, the effect size of CY and WUE under FMDI decreased. For CT, FMDI increased vegetable CY (13.3–17.5%) and field crop WUE (12.3–53.7%). MM had no significant effect on improving CY or WUE. This study provides a reference for the practice of film mulching under drip irrigation conditions.

提高用水效率是农业节水的有效途径。滴灌是一种已在世界范围内采用的节水灌溉技术。薄膜覆盖可以防止不希望的水蒸发损失并提高土壤表面温度。本研究通过荟萃分析评估滴灌下地膜覆盖对作物产量（CY）和水分利用效率（WUE）的影响，以确定地膜覆盖和滴灌相结合时是否存在叠加效应以及地膜的限制因素是否覆盖对农业生产起到积极作用。结果表明，与非覆盖滴灌 (NMDI) 相比，覆盖膜滴灌 (FMDI)使CY 和 WUE 分别增加约 20% 和 30%。. 这些改进受到气候条件（气候）、土壤条件（SC）、作物类型（CT）、耗水量（WC）和覆盖材料（MM）的影响。对于气候，地膜覆盖在温度 (Te) 值低于 10 °C 且降雨量 (RF) 低于 400 mm 的地区最为有效，使 CY 增加 17.6%，WUE 增加 16.2%。对于 SC，FMDI在植物可用水容量低于 17% 的中等质地（壤土）土壤类型中对 CY 和 WUE 的改善最大。随着用水量的增加，FMDI 下 CY 和 WUE 的影响大小减小。对于 CT，FMDI 增加了蔬菜 CY (13.3–17.5%) 和大田作物 WUE (12.3–53.7%)。MM 对改善 CY 或 WUE 没有显着影响。该研究为滴灌条件下地膜覆盖的实践提供参考。