| 引用本文: | 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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| 摘要: |
| 【目的】为探究河套灌区滴灌条件下玉米各生育期不同土层深度土壤水氮变化规律及不同灌水量对土壤硝态氮累积量的影响。【方法】本文通过田间试验，设置高灌水量（D1：76 mm）处理和低灌水量（D2：60 mm）处理，分析土壤含水率和土壤氮素（铵态氮和硝态氮）的运移规律，利用HYDRUS-2D模型进行模拟验证和预测，并设置了60 mm、90 mm及120 mm等不同的灌溉定额情景。【结果】各处理灌水后土壤含水率呈现增加趋势；而土壤铵态氮和硝态氮在灌水施肥后迅速升高随后下降，D1处理和D2处理不同生育期0~10 cm土层平均降幅分别为60.0%~62.0%和40.0%~46.7%。拔节期、抽雄期和灌浆期各土层灌水后D1处理较D2处理土壤含水率分别增加了5.9%、8.0%和6.7%，而土壤铵态氮和硝态氮随着土层深度增加而降低。不同生育期硝态氮累积量拔节期＞抽雄期＞灌浆期，随生育期的推进硝态氮累积量呈现降低趋势。土壤含水率及土壤氮素模拟值与实测值吻合度较高，统计精度参数R2、RMSE和d均处在合理范围内。【结论】HYDRUS-2D模型模拟预测结果表明，增加滴灌次数并适当提高灌水定额，玉米生育期120 mm的灌溉定额可有效降低0~60 cm土壤硝态氮累积量，并遏制硝态氮在60~100 cm土层的积累。该研究可为当地灌区进行合理的水肥调控及灌溉制度的制定提供参考。 |
| 关键词: 土壤含水率；铵态氮；硝态氮；数值模拟；HYDRUS-2D模型 |
| DOI： |
| 分类号:S |
| 基金项目:国家自然科学基金项目(51609170)；国家重点研发计划项目(2019YFC0409203)；天津市研究生科研创新项目(2021YJSS135)。 |
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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 |
