| 摘要: |
| 摘 要：【目的】优化稻田氨挥发减排的水炭调控模式。【方法】基于田间实测数据，利用DNDC模型构建并验证了水炭调控稻田氨挥发过程模拟模型，分析了不同灌溉模式及生物炭添加水平对稻田氨挥发损失量的影响特征，最终优选出稻田氨挥发减排的水炭调控模式。【结果】基于DNDC模型构建的水炭调控稻田氨挥发过程模拟模型，稻田分蘖肥后1周、穗肥后1周、整个稻季的氨挥发量模拟值和实测值的相对误差均在±8%以内，能够较好的模拟控制灌溉稻田添加不同水平生物炭后土壤氨挥发损失特征。随生物炭添加量的增加，相同灌溉处理稻田氨挥发损失量呈小幅递减趋势；相同生物炭添加水平下，稻田氨挥发损失量随灌水下限的降低出现小幅下降。灌水处理和添加生物炭均显著影响稻田氨挥发损失量，灌水处理是主要影响因素，对稻田氨挥发的作用明显强于添加生物炭。【结论】I3B11处理为稻田水炭调控最优模式，在降低稻田灌溉下限的基础上适当增施生物炭可以有效降低稻田氨挥发量。 |
| 关键词: DNDC；氨挥发；生物炭；控制灌溉；稻田 |
| DOI： |
| 分类号:S274 |
| 基金项目:国家自然科学(51609141)；中央级公益性科研院所基本科研业务费专项资金项目(Y920008、Y921013)；江苏水利科学项目(2021052) |
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| Simulation and emission reduction model of ammonia volatilization from paddy field based on DNDC model |
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biwentong
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Nanjing Hydraulic Research Institute
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| Abstract: |
| Abstract:【Objective】The objective is to optimize the water and carbon control mode for ammonia volatilization and emission reduction in paddy field.【Method】A simulation model for ammonia volatilization process in paddy field controlled by water and biochar was built and validated by DNDC model based on field measured data, and the characteristics of ammonia volatilization loss in paddy field affected by different irrigation modes and biochar addition levels were analyzed. Finally, the water and carbon control mode for ammonia volatilization and emission reduction in paddy field was selected.【Result】The results showed that the relative errors of simulation values and measured values of ammonia volatilization in model paddy field after tillering fertilizer, one week after spike fertilizer and rice season were within <8%, which could better simulate and control the characteristics of ammonia volatilization loss in paddy field after applying different levels of biochar. With the increase of biochar addition, ammonia volatilization loss of paddy fields under the same irrigation treatment showed a small decreasing trend. At the same level of biochar addition, ammonia volatilization loss in paddy field decreased slightly with the decrease of irrigation limit. Irrigation water treatment and application of biochar significantly affect ammonia volatilization loss in paddy field. Irrigation water treatment is the main influencing factor and has a stronger effect on ammonia volatilization in paddy field than application of biochar.【Conclusion】I3B11 treatment is the optimal mode for controlling water and carbon in rice fields,ammonia volatilization emission reduction in paddy field can be effectively achieved by properly increasing biochar application on the basis of lowering the lower irrigation limit of paddy field. |
| Key words: DNDC; ammonia volatilization; biochar; controlled irrigation; paddy fields. |
