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| DOI：10.13522/j.cnki.ggps.2026047 |
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| Effect of straw interlayers on salt leaching in saline-alkali soils under saline water drip irrigation |
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YIN Fang, DONG Xingzhi, ZHANG Wenbo, ZHAO Song, TANG Guangmu, XU Wanli, FENG Di
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1. Xinjiang University College of Ecology and Environment, Urumqi 830017, China;
2. Institute of Agricultural Resources and Environment, Xinjiang Academy of Agricultural Sciences, Urumchi 830091, China;
3. Resource and Environment College of Xinjiang Agricultural University, Urumqi 830052, China;
4. Tianjin Agricultural University College of Hydraulic Engineering, Tianjin 300392, China
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| Abstract: |
| 【Objective】Using saline water as a supplementary irrigation resource is a mitigation strategy to safeguard agricultural production and vegetation restoration in regions facing soil salinization and freshwater scarcity. However, how to safely use saline water remains a major challenge. We investigated the efficacy of straw layering (straw return stratification) on salt leaching in saline-alkali soil under drip irrigation.【Method】The experiment was conducted using soil columns and consisted of three straw treatments: no stratification, a single stratification with a straw layer 5 cm thickness buried at the depth of 20 cm, and double stratification with straw layers of 2.5 cm thickness buried at depths of 20 cm and 40 cm; each straw treatment had two irrigation treatments: freshwater irrigation (0.3 g/L, 500 mm; FF) and alternating saline-freshwater irrigation (254 mm saline water + 246 mm freshwater; SF). During the experiment, we measured soil water and salt distribution immediately after the irrigation and one year after the irrigation.【Result】All treatments resulted in a significant desalination in the 0-40 cm soil layer. Soil desalination rate after leaching (SDRL) in the FF treatment was 90.9%, 78.6% and 76.1% for no stratification, single stratification and double stratification, respectively; their associated salt return rate (SRR) after one year was 432.9%, 47.9% and 14.5%, and final soil desalination rate (SDRF) was 42.0%, 68.2%, and 71.7%, respectively. The SDRL in SF was 77.7%, 89.0% and 78.8% for no stratification, single stratification and double stratification, and their associated SRR values were 185.4%, 162.7%, and 76.3%, and SDRF be 35.1%, 68.9%, and 62.1%, respectively.【Conclusion】The combination of single straw stratification and alternating saline-freshwater irrigation was most effective for salt leaching and salt return suppression. The combination of double straw stratification and alternating saline-freshwater irrigation showed superior performance in water retention and long-term soil desalination, effectively reducing salt accumulation while maintaining soil structure stability. These results provide valuable insights for saline-alkali soil improvement and efficient utilization of water resources. |
| Key words: straw interlayer; alternating saline-freshwater irrigation; water-salt movement; desalination efficiency; saline-alkali soil improvement |
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