| Quantitative analysis of dry drainage effect on heavily salinized cultivated land in the Hetao Irrigation District |
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| DOI：10.7606/j.issn.1000-7601.2025.02.27 |
| Key Words: alinized cultivated land dry drainage land use type 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 | | SHI Haibin | College of Water Conservation and Civil Engineering, Inner Mongolia Agricultural University, 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 | | 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 |
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| Abstract: |
| This study used a typical irrigation and drainage unit in the Hetao Irrigation District as a case study to identify the area of saline\|alkali cultivated land with a dry drainage function and to propose adjustments to its land use type. Based on the water and salt balance model and its component calculation, the effect of dry drainage on saline\|alkali cultivated land was quantified, and the influence of land use type change on dry drainage system was analyzed. The results showed that by adjusting the land use type of the saline\|alkali cultivated land, the area of wasteland increased by 1.93 hm2, the proportion increased by 0.58%, but the water migration from cultivated land to wasteland increased by 18.59%. The dry drainage increased by 18.56%, and the salt deposit in cultivated land decreased by 55.80%. During the growth period from 2019 to 2020, the amount of salt discharged from the study area accounted for 41.61% and 36.46% of the total introduced salt, respectively. The salt excreted to the wasteland through dry drainage accounted for 52.39% and 53.5% of the total introduced salt, respectively. The accumulated salt in cultivated land accounted for 6.00% and 10.04% of the total introduced salt, respectively. In conclusion, it is feasible to convert saline\|alkali cultivated land into salt discharge wasteland, effectively serving as dry drainage. However, the open\|ditch drainage system in the Hetao Irrigation District still requires improvement to ensure effective salt discharge. |
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