| Cite this article: | 谢阳村,高世凯.基于DRAINMOD模型的不同灌排模式稻田水氮运移模拟[J].灌溉排水学报,0,():-. |
| Xie Yang-cun,Gao Shi-kai.基于DRAINMOD模型的不同灌排模式稻田水氮运移模拟[J].灌溉排水学报,0,():-. |
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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 |
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