| Cite this article: | 潘大全,陈军锋,薛静,等.冻融期不同时间灌水对土壤蒸发规律影响的模拟研究[J].灌溉排水学报,0,():-. |
| pandaquan,CHEN Jun-feng,XUE Jing,et al.冻融期不同时间灌水对土壤蒸发规律影响的模拟研究[J].灌溉排水学报,0,():-. |
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| Simulation Study on the Effect of Irrigation at Different Times on Soil Evaporation during Freeze-Thaw Period |
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pandaquan1, CHEN Jun-feng1, XUE Jing1, CUI Li-hong1, ZHAO De-xing1, DU Qi2
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1.Taiyuan University of Technology;2.Taigu Water Balance Experimental Field, Hydrology and Water Resources Survey Station of Shanxi Province
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| Abstract: |
| Abstract:【Background】The permafrost regions of our country occupies a wide area, dry and less rainy. In view of the severe changes in climatic conditions, it may lead to water shortages for winter crops. Improve irrigation methods to increase water use efficiency to maintain winter agricultural production.【Objective】 In order to study the effect of irrigation at different times on soil evaporation during freeze-thaw period.【Method】 Field experiments were carried out on unirrigated bare land L0 and 7 different irrigated plots during freeze-thaw period (labeled L1, L2, L3, L4, L5, L6 and L7, irrigated only once with the quota of 225 m3 per hm2); And use the water-heat coupling model (SHAW) to carry on the simulation.【Result】 The cumulative soil evaporation in the irrigated plots during the freeze-thaw period increased by 24.0%-150.0% compared with the non-irrigated plots, and the soil cumulative evaporation was unstable. During the freezing stage, irrigation promoted soil evaporation, and compared with the non-irrigated plots, the cumulative soil evaporation increased by 22.4%~27.0%; in the stable freezing stage, the effect of irrigation on soil evaporation was weak, and the cumulative soil evaporation of L3~L4 was the least, which was 3.8%~67.1% lower than that of other irrigated plots; the soil evaporation of irrigated plot L6 in the thawing and thawing stage was the highest , 55.3%~97.1% higher than other plots.【Conclusion】In the stable freezing stage, the effect of irrigation on the soil evaporation rate within 3 days was weak, and 90.7%-91.4% of the irrigation amount in the freezing and thawing period was stored in the soil. |
| Key words: Seasonal freeze-thaw period, irrigation time, SHAW, soil evaporation, numerical simulation |
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