| 摘要: |
| 【目的】为研究不同灌排模式稻田水氮动态变化,【方法】根据试验资料,采用 Morris方法检测DRAINMOD模型水氮运移相关参数的灵敏度,并利用DRAINMOD模型对不同灌排模式稻田水氮动态进行模拟。【结果】研究结果表明：20-40cm土层侧向饱和导水率对稻田水分运移模拟结果影响最大,弥散系数、反硝化参数、硝化反应参数有机质适宜分解温度对稻田氮素运移模拟结果影响较大；DRAINMOD模型能够较好模拟不同灌排模式稻田水氮动态变化,灌排水量、氮素径流总负荷模拟值与实际值差别小于11%；与传统灌排模式相比,控制灌排模式排水量减少33.0~72.6%,灌水量减少9.7%~37.1%,铵态氮径流负荷减少43.6%~45.0%,硝态氮径流负荷分别减少29.8%~53.1%。【结论】因此,控制灌排模式稻田节水减排效果较好,利用 DRAINMOD 模型进行不同灌排模式稻田水氮动态模拟是可行有效的。 |
| 关键词: 水稻;水氮动态;DRAINMOD模型;灵敏度;控制灌排 |
| DOI： |
| 分类号:S276.7；S143.1 |
| 基金项目:国家水体污染控制与治理科技重大专项(2018ZX07111003)；国家自然科学(51879074) |
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| English title Dynamic simulation of water and nitrogen in paddy field using the DRAINMOD model under different irrigation and drainage Modes |
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Xie Yang-cun1, Gao Shi-kai2
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1.Chinese Academy of Environmental Planning;2.North China University of Water Resources and Electric Power,School of Water Conservancy
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| Abstract: |
| 【Background】Farmland drainage model has attracted wide attention, which is helpful to improve farmland management and nitrogen loss. 【Objective】In order to explore the change of water and nitrogen in paddy field under different irrigation and drainage modes, 【Method】 the Morris analysis was adopted to detect the parameters sensitivity of water and nitrogen change in the DRAINMOD model and the change of water and nitrogen in paddy field was simulated. 【Result】The results showed that the lateral saturated water conductivity of 20-40cm soil layer had the greatest influence on the simulation results of water change in the paddy field, the diffusion coefficient, denitrification parameters, nitrification reaction parameters and appropriate decomposition temperature of organic matter had a greater influence on the simulation results of nitrogen change in paddy field. The DRAINMOD model could simulate the change of water and nitrogen in different irrigation and drainage modes, and the difference between the simulated value and actual value of the irrigation and drainage volume and the total load of nitrogen runoff is less than 11%. Compared with the traditional irrigation and drainage mode, the drainage volume of the controlled irrigation and drainage mode was reduced by 33.0~72.6%, the irrigation volume was reduced by 9.7%~37.1%, the ammonium nitrogen runoff load was reduced by 43.6 ~45.0%, and the nitrate nitrogen runoff load was reduced by 29.8%~53.1%. 【Conclusion】Therefore, the water-saving and emission reduction of controlled irrigation and drainage mode is effective in paddy field, and it is feasible and effective to simulate the water and nitrogen dynamic in paddy field under different irrigation and drainage modes by using the DRAINMOD model. |
| Key words: water and nitrogen change; DRAINMOD model; sensitivity; support system; controlled irrigation and drainage |
