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| DOI：10.13522/j.cnki.ggps.2025172 |
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| Combined effects of irrigation, drainage and fertilization on soil water and salt dynamics in Yellow River water-irrigated districts |
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CHEN Cheng, LIU Yongfeng, XIAO Meng, YAO Wenyi, LIU Guangming, HOU Liting
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1. Yellow River Water Conservancy Technical University, Kaifeng 475003, China;
2. Henan Hydro-Environmental Consulting & Engineering Co., Ltd., Sanmenxia 472000, China;
3. Yellow River Water Conservancy Committee Yellow River Water Conservancy Science Research Institute, Zhengzhou 450003, China;
4. Chinese Academy of Sciences Nanjing Institute of Soil Science, Nanjing 211135, China;
5. Henan Engineering Research Center of Eco-hydraulic for Small Watershed, Kaifeng 475003, China
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| Abstract: |
| 【Objective】Soil salinization is a major constraint to agricultural production in regions irrigated using diverted exogenous water. This paper presents the results of a field experiment that explored how irrigation, drainage and fertilization can be optimized to alleviate the adverse effects of soil salinization in Yellow River water-irrigated districts in China. 【Method】The experiment was conducted in a drip-irrigated area. It consisted of ten treatments with different combinations of irrigation amounts (ranging between 1 800 and 2 700 m3/hm2), drainage intensity (varying between 3 and 7 cm/d), and nitrogen fertilization (varying between 0 and 300 kg/hm2). During the experiment, we measured the changes in soil pH, soil water and salt content in the 0-100 cm soil profile. 【Result】① Drainage significantly reduced soil pH by 1.54%-4.14% in the 0-100 cm soil profile, while nitrogen fertilization increased pH of the topsoil by 0.2%-1.2%. Irrigation and nitrogen fertilization notably increased soil water content in the top 0-20 cm soil, while drainage reduced it, especially in the subsoil, by up to 10%. ② Combination of irrigation and drainage increased salt leaching by up to 34%, whereas fertilization increased salt accumulation by 18%-37%, compared to the control. ③ Quantitative analysis revealed that irrigation amount had the strongest influence on spatiotemporal dynamics of soil water and salt, followed by drainage frequency and intensity. 【Conclusion】Irrigation amount is the primary factor regulating soil water-salt dynamics in Yellow River water-irrigated areas. Optimizing irrigation and drainage can effectively mitigate soil salinization, whereas excessive fertilization exacerbates salt accumulation. A management strategy combining high-frequency and low-volume irrigation, periodic intensive drainage, and controlled-release fertilization can stabilize soil pH, maintain optimal root-zone soil water content, and reduce salt accumulation. Ou results provide a practical solution for mitigating soil salinization in the study regions. |
| Key words: Yellow River Irrigation District; Irrigation-drainage-fertilization; water-salt transport; influencing mechanisms |
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