| Cite this article: | 崔赫钊,周青云,韩娜娜.基于HYDRUS-2D模型的滴灌条件下土壤水氮动态模拟研究[J].灌溉排水学报,2022,():-. |
| cuihezhao,zhouqingyun,hannana.基于HYDRUS-2D模型的滴灌条件下土壤水氮动态模拟研究[J].灌溉排水学报,2022,():-. |
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| Simulation of soil water and nitrogen dynamics under drip irrigation based on HYDRUS-2D |
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cuihezhao, zhouqingyun, hannana
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Tianjin Agricultural University
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| Abstract: |
| 【Objective】In order to explore the change law of soil water and nitrogen in different soil depths and the effect of different irrigation amount on soil nitrate nitrogen accumulation under drip irrigation in Hetao Irrigation Area.【Method】Through field experiments, high irrigation water (D1:76 mm) and low irrigation water (D2:60 mm) treatments were set up to analyze the soil moisture content and soil nitrogen (ammonium nitrogen and nitrate nitrogen) transport regular and the HYDRUS-2D model was used for simulation and prediction. On this basis, three different irrigation quota scenarios of 60 mm, 90 mm and 120 mm were set. 【Result】After irrigation, the soil moisture content of different growth stages (jointing stage, tasseling stage and filling stage) showed an increasing trend; However, soil ammonium nitrogen and nitrate nitrogen increased rapidly after irrigation and fertilization, and then decreased. The average decreases of 0-10 cm soil layer in different growth stages of D1 and D2 treatments were 60.0%~62.0% and 40.0%~46.7%. After irrigation, the soil moisture content of D1 treatment increased by 5.9%, 8.0% and 6.7% respectively compared with that of D2 treatment at different growth stages, while the soil ammonium nitrogen and nitrate nitrogen decreased with the increase of soil depth. Nitrate nitrogen accumulation in different growth stages (jointing stage > heading stage > filling stage) showed a decreasing trend with the advancement of growth stage. The simulated values of soil moisture content and soil nitrogen are in good agreement with the measured values, and the statistical precision parameters R2, RMSE and d are all within a reasonable range. 【Conclusion】The simulation and prediction results of HYDRUS-2D model show that the irrigation quota of 120 mm during the growth period of corn can effectively reduce the accumulation of nitrate nitrogen in 0~60 cm soil layer of the irrigation area and curb the accumulation of nitrate nitrogen in 60~100 cm soil layer by increasing the number of drip irrigation and properly increasing the irrigation quota. The simulation scenario can provide reference for water and fertilizer regulation and formulation of appropriate irrigation system in local irrigation area. |
| Key words: Soil moisture content; Ammonium nitrogen; Nitrate nitrogen; numerical simulation; HYDRUS-2D model |
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