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| DOI：10.13522/j.cnki.ggps.2025375 |
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| Impact of irrigation reduction on groundwater and associated ecological consequences in the Yinbei Plain |
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DU Mingyi, YU Suyue, WANG Zhongjing, ZHANG Na, WANG Tao, LI Yanbin
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1. College of Civil and Hydraulic Engineering, Ningxia University, Yinchuan 750021, China;
2. School of Civil Engineering, Tsinghua University, Beijing 100084, China;
3. Ningxia Institute of Water Conservancy Science, Yinchuan 750021, China;
4. Ningxia Hanyan Canal Management Office, Yinchuan 750003, China
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| Abstract: |
| 【Objective】The Yinbei Plain in Northwest China is characterized by scarce water resources, intensive irrigation agriculture, and fragile ecological conditions. This paper develops a framework to assess the impact of regional agricultural water conservation on ecological systems, including groundwater level, vegetation, and soil salinization under reduced irrigation conditions in this region.【Method】The assessment framework was based on remote sensing inversion, groundwater depth, natural vegetation coverage, and secondary soil salinization. Using this framework, we analyzed the impact of different water-saving irrigation scenarios on groundwater depth and the associated consequences for vegetation ecology and soil salinization, and evaluated the optimal irrigation reduction and potential water rights transfer volume.【Result】The results showed that the optimal groundwater depth for non-zonal vegetation in the Yinbei Plain ranged from 2.50 to 3.25 m, and the critical groundwater depth for secondary salinization was in the range of 0.30-2.50 m. Based on these results, the Huinong Irrigation District is the only sub-irrigation district among the five districts in the Ningxia Yellow River diversion irrigation area that still has potential for agricultural water savings.【Conclusion】Under the premise of maintaining ecological stability, the transferable water right in the Huinong sub-irrigation district is approximately 169 million m3. The proposed method provides a useful tool for evaluating agricultural water-saving potential and water resource management in irrigation districts in arid regions. |
| Key words: groundwater; numerical simulation; irrigation reduction; vegetation coverage; soil salinization |
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