| Soil water and salt dynamics under various irrigation and drainage methods in the Hetao irrigation district:A SahysMod\|based analysis |
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| DOI：10.7606/j.issn.1000-7601.2025.03.25 |
| Key Words: soil salinity Sahysmod model irrigation and drainage management Hetao irrigation district |
| Author Name | Affiliation | | ZHANG Wencong | Department of Hydraulic Engineering, Hebei University of Water Resources and Electric Engineering, Cangzhou, Hebei 061001, China | | ZHOU Hui | National Field Scientific Observation and Research Station of Grassland Ecological Hydrology at the North Foot of Yinshan Mountain, Inner Mongolia, China Academy of Water Resources and Hydropower Sciences, Hohhot, Inner Mongolia 010018, China | | LI Huanhuan | Department of Hydraulic Engineering, Hebei University of Water Resources and Electric Engineering, Cangzhou, Hebei 061001, China | | WANG Yahui | Department of Hydraulic Engineering, Hebei University of Water Resources and Electric Engineering, Cangzhou, Hebei 061001, China | | CUI Zhimou | Department of Hydraulic Engineering, Hebei University of Water Resources and Electric Engineering, Cangzhou, Hebei 061001, China | | SHAN Changhe | Department of Hydraulic Engineering, Hebei University of Water Resources and Electric Engineering, Cangzhou, Hebei 061001, China | | WANG Fengchun | Department of Hydraulic Engineering, Hebei University of Water Resources and Electric Engineering, Cangzhou, Hebei 061001, China | | SHI Haibin | College of Water Conservation and Civil Ingineering, Inner Mongolia Agricultural University, Hohhot, Inner Mongolia 010018, China |
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| Abstract: |
| Soil salinization is a significant factor limiting the sustainable development of agriculture in the Hetao irrigation district. Improving irrigation and drainage management plays a crucial role in the prevention and control of soil salinization in the region. Using typical irrigation and drainage units in the Hetao irrigation district as examples, this study simulated and predicted the dynamic changes in soil salinization in both cultivated land and wasteland over the next 10 years under different irrigation and drainage management scenarios, based on the validated SahysMod model. Results indicated that under the current conditions, soil salinity in cultivated land exhibited a slow increase during the early stage of the forecast (2021—2025) and a more pronounced rise in the later stage (2026—2030). In contrast, soil salinity in wasteland increased gradually during the early stage of the prediction and remained relatively stable in the later stage. These scenarios were based on the validated SahysMod model. Compared to wasteland, the reduction in total water diversion had a greater impact on soil salinity changes in cultivated land. As the irrigation quota decreased, soil salinity in cultivated land increased significantly. However, as the irrigation quota increased, the rate of reduction in soil salinity accumulation was not as pronounced. Increasing the irrigation quota continues to play an important role in soil salt leaching and in maintaining the effectiveness of drainage and salt removal in the study area. From the perspective of salt accumulation in cultivated land versus wasteland, the most significant salt control effect is achieved by increasing the current drainage ditch depth from 1.5 meters to 1.8 meters. |
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