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首页> 外文会议>International Conference on Regional Carbon Budgets; 20060816-18; Beijing(CN) >Mitigation options for methane emissions from rice fields
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Mitigation options for methane emissions from rice fields

机译：稻田甲烷排放的缓解方案

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摘要

The revised DNDC model was simulated against field observation data under irrigated rice field in Thailand. The model was run over 24 years with constant input data of climate and varying cultivation parameter in order to consider changing in soil carbon and other characters over cultivation period. The results shown rice straw incorporation into rice soil enhances methane emission. The magnitude of methane emission depends on amount of rice straw incorporation. Rice straw incorporation leads to higher soil organic carbon available in rice soil and induces lower soil Eh when compared to cultivation without rice straw incorporation. The simulation under different field drainage shown field drainage induces dry condition in rice soil and leads to lower soil Eh compared to normal flooded condition. Drainage during different growing period and different drainage duration results in different magnitude of methane emission. Possible mitigation options for methane emission were proposed regarding to the results of this study. 1) Reduce amount of rice straw incorporation into rice soil, and 2) conduct field drainage during growing period. However, field drainage may induce weeds and possible to reduce rice grain yield. Therefore, optimum drainage period in optimum growth stage of rice plant needs to concern to obtain the practical mitigation option.
机译：根据泰国灌溉稻田的实地观测数据对修订后的DNDC模型进行了仿真。该模型运行了24年，具有恒定的气候输入数据和变化的耕作参数，以考虑耕作期间土壤碳和其他特征的变化。结果表明，将稻草掺入稻田土壤中可提高甲烷排放量。甲烷排放量取决于稻草的掺入量。与未掺入稻草的耕作相比，掺入稻草可提高稻田土壤中的土壤有机碳含量，并降低土壤Eh。在不同的田间排水条件下进行的模拟表明，田间排水条件导致水稻土处于干旱状态，与正常的淹水状态相比导致土壤Eh降低。在不同的生长期和不同的排水时间下的排水导致甲烷排放量的不同。针对这项研究的结果，提出了可能的甲烷排放缓解方案。 1）减少稻草掺入水稻土壤的量，并且2）在生长期进行田间排水。但是，田间排水可能会引起杂草，并可能降低稻谷的产量。因此，为获得实用的减缓方案，需要考虑水稻最佳生育期的最佳排水期。

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