Efficient utilization of the limited water and land resources is critical for global development with a growing population. The widespread saline land remains an important reserved land resource for food security. This study investigated the performance of the raised field-shallow trench pattern on salt removal and water budget in the cotton field by a virtual experiment. The widely-used physically-based HYDRUS (2D/3D) model was used to implement different raise field elevations and slopes. Results showed that the raised land could control the soil salinity in the unsaturated root zone by intensifying the drainage. Compared with the flat land, the desalination effect of the raised land was more effective with the gentler slope and higher raised elevation. Without irrigation, the 30° and 45° slope-raised lands had slight effect on the soil salinity in the unsaturated root zone. Salt removal would be more effective with the addition of irrigation, with the desalination ratio ranging from 10.60% to 41.01% under fresh irrigation, or from 6.76% to 25.92% under saline irrigation, respectively. More importantly, the implementation of irrigation effectively improved the cotton root water uptake, and saline water irrigation for the 15° slope-raised field was proved to nearly meets the cotton water requirement. Therefore, the raised field-shallow trench pattern combined with saline water irrigation may provide local farmers with an alternative solution to saline land reclamation under fresh water scarcity.

有效利用有限的水和土地资源对于人口不断增长的全球发展至关重要。大面积盐碱地仍然是粮食安全的重要后备土地资源。本研究通过虚拟实验研究了凸起的田间浅沟模式对棉田脱盐和水分收支的性能。广泛使用的基于物理的 HYDRUS (2D/3D) 模型用于实现不同的加高场高程和坡度。结果表明，抬高地可以通过加强排水控制非饱和根区土壤盐分。与平地相比，坡度更平缓、高程高的凸起地的海水淡化效果更显着。没有灌溉，30°和45°坡度隆起地对非饱和根区土壤盐分影响较小。加灌除盐效果更佳，鲜灌脱盐率分别为10.60%～41.01%，盐渍灌溉脱盐率分别为6.76%～25.92%。更重要的是，灌溉的实施有效地提高了棉花根系吸水量，15°坡耕地盐水灌溉基本满足棉花需水量。因此，凸起的田间浅沟模式结合咸水灌溉可以为当地农民提供淡水短缺情况下盐渍化土地复垦的替代解决方案。新鲜灌溉下的脱盐率分别为10.60%至41.01%，盐渍灌溉下的脱盐率分别为6.76%至25.92%。更重要的是，灌溉的实施有效地提高了棉花根系吸水量，15°坡耕地盐水灌溉基本满足棉花需水量。因此，凸起的田间浅沟模式结合咸水灌溉可以为当地农民提供淡水短缺情况下盐渍化土地复垦的替代解决方案。新鲜灌溉下的脱盐率分别为10.60%至41.01%，盐渍灌溉下的脱盐率分别为6.76%至25.92%。更重要的是，灌溉的实施有效地提高了棉花根系吸水量，15°坡耕地盐水灌溉基本满足棉花需水量。因此，凸起的田间浅沟模式结合咸水灌溉可以为当地农民提供淡水短缺情况下盐渍化土地复垦的替代解决方案。15°坡耕地咸水灌溉基本满足棉花需水量。因此，凸起的田间浅沟模式结合咸水灌溉可以为当地农民提供淡水短缺情况下盐渍化土地复垦的替代解决方案。15°坡耕地咸水灌溉基本满足棉花需水量。因此，凸起的田间浅沟模式结合咸水灌溉可以为当地农民提供淡水短缺情况下盐渍化土地复垦的替代解决方案。