内蒙古河套灌区荒地水盐运移规律模拟

Simulation of water and salt transport of uncultivated land in Hetao Irrigation District in Inner Mongolia

该文以内蒙古河套灌区为背景展开荒地水盐运移规律研究。在田间试验基础上,分析荒地土壤水盐的运移机理,利用HYDRUS-1D模型对荒地土壤水盐的迁移规律进行了模拟。荒地做为灌区盐分的贮存地,成为灌区水盐平衡的重要调节因素,荒地水盐动态研究对于干旱灌区具有重要意义。结果表明,强蒸发是荒地水盐运移的原动力,5cm土层EC值上升了66.10%,20cm土层EC值上升了63.89%。荒地在作物生育期是积盐的过程,在秋浇期是流失盐分的过程。经检验,HYDRUS-1D模型对盐渍化地区荒地水盐在垂直方向运移的模拟具有较高的精度,为区域水盐管理和灌区的可持续发展提供科学依据。

Water and salt transport was studied in the uncultivated land of Hetao Irrigation District in Inner Mongolia.Based on field experiment,mechanism of water and salt transport of the uncultivated land in the irrigation district was analyzed,and its water and salt transport dynamics were simulated with HYDRUS-1D model.The uncultivated land in the irrigation district had become salt storage area and the important regulator for water and salt balance in the irrigation district,and study on water and salt dynamic in uncultivated land was of significance for uncultivated irrigation district.The results showed that strong evaporation was the driving force for water and salt transport,EC values in soil layers of 5 cm had increased by 66.10%,and EC values in soil layers of 20 cm had increased by 63.89%.The uncultivated land underwent salt accumulating process in crop growing period but salt losing process in autumn irrigation period.Verification using the experiment data indicated that HYDRUS-1D model had a high precision for the simulation of water and salt transport of the uncultivated land in vertical direction.The results can serve as a scientific basis for regional water and salt management and sustainable development of the irrigation districts.