Due to existing problems related to drip irrigation under the conditions of mulching and the vigorous promotion of soil covered drip irrigation without film, drip irrigation experiments were conducted in 2017 and 2018 in order to explore the mechanism of water conservation. Three different irrigation treatments were adopted in this study: high, middle, and low irrigation quotas. In addition, two different experiment areas were selected: Taking mulching as an example, Zone I (film covered area) and Zone Ⅱ (bare soil area). For comparison, the division of zone with soil covered drip irrigation without film was the same as that with the mulching film. The two zones were designed to analyze soil evaporation regularity based on a calibrated SIMDualKc model under the conditions of both mulched drip irrigation and soil covered drip irrigation without film, respectively. The results showed that the SIMDualKc model could potentially be applied to simulate the soil water content and evaporation rates with a higher accuracy. The soil evaporation in high-water treatment was 13% higher than that in medium-water treatment, and that in low-water treatment was 5% lower than that in medium-water treatment under the soil covered drip irrigation without film conditions. The evaporation rates were only 0.67 mm and 36.18 mm in the Zone I and Zone II areas under mulched drip irrigation conditions, respectively. The water conservation had mainly occurred in the mulched area (Zone I) where mulched drip irrigation methods were utilized, and the evaporation was much less than that of the areas where soil covered drip irrigation without film methods were implemented. The results obtained in this study may provide a theoretical basis for future maize production under the conditions of both mulched drip irrigation and soil covered drip irrigation without film processes.

由于覆盖条件下滴灌存在的问题以及大力推广无膜覆盖滴灌技术，于2017年和2018年进行了滴灌试验，以探索节水机理。本研究采用了三种不同的灌溉方式：高，中，低灌溉配额。另外，选择了两个不同的试验区域：以覆盖为例，I区（膜覆盖面积）和Ⅱ区（裸土面积）。为了进行比较，没有覆膜的土壤覆盖滴灌的分区与覆膜的分区相同。设计了两个区域，分别基于覆盖膜滴灌和无膜土壤滴灌条件下的SIMDualKc校准模型分析土壤蒸发规律。结果表明，SIMDualKc模型可以潜在地应用于以更高的精度模拟土壤水分和蒸发速率。在没有覆膜条件下的土壤覆盖滴灌条件下，高水处理的土壤蒸发量比中水处理的土壤蒸发量高13％，低水处理的土壤蒸发量比中水处理土壤水分低5％。在覆盖滴灌条件下，I区和II区的蒸发速率分别仅为0.67 mm和36.18 mm。节水主要发生在采用了膜下滴灌的覆盖区（一区），其蒸发量远小于没有覆膜的土壤覆盖滴灌的蒸发量。本研究获得的结果可为在覆膜滴灌和无膜覆盖土滴灌条件下未来玉米生产提供理论依据。