| 张文聪,周慧,李环环,王亚晖,崔志谋,单长河,王凤春,史海滨.基于SahysMod的河套灌区不同灌排方式土壤水盐动态研究[J].干旱地区农业研究,2025,(3):245~259 |
| 基于SahysMod的河套灌区不同灌排方式土壤水盐动态研究 |
| 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 |
| 中文关键词: 土壤盐分 SahysMod模型 灌排管理 河套灌区 |
| 英文关键词:soil salinity Sahysmod model irrigation and drainage management Hetao irrigation district |
| 基金项目:河北水利电力学院基本科研业务费专项资金（SYKY2208） |
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| 中文摘要: |
| 土壤盐渍化是制约河套灌区农业可持续发展的重要因素，完善和提高灌排管理对河套灌区土壤盐渍化防治具有关键作用。以河套灌区典型灌排单元为例，基于率定和验证后的SahysMod模型，模拟预测在不同灌排管理情景下未来10年耕地、荒地土壤饱和浸提液的电导率（ECe）动态变化。结果表明：在现状引水总量和灌溉定额下，耕地根区土壤ECe值增长较为缓慢，荒地容纳盐分的效果较好，具体表现为2021—2025年和2026—2030年的耕地根区土壤ECe值分别增加0.51 dS·m-1和1.49 dS·m-1，增速分别为13.38%和34.40%；荒地根区土壤ECe值分别增加8.24 dS·m-1和3.44 dS·m-1，增速分别为29.46%和9.49%。通过工程开挖将排水沟深度增加至1.8 m时最符合耕、荒地的控盐要求，具体表现为2021—2025年和2026—2030年耕地根区土壤ECe值增幅分别为6.92%和19.45%;荒地根区土壤ECe值的增幅为20.26%和8.67%。综合考虑后，推荐典型灌排单元维持现状生育时期总引水量、现状灌溉定额，排水斗沟深度从现状1.5 m增加到1.8 m。 |
| 英文摘要: |
| 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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