Paddy fields are major sources of CH4 emission and a vital source of global warming. Thus, it is important to understand the CH4 cycling in paddy field. The CH4 chemistry, mechanisms of production and emission from paddy fields are also significantly important to understand. This paper discusses about the CH4 cycling, how CH4 emission effect on the global warming, and the mechanisms of CH4 exchange between rice paddy field and atmosphere, factors effecting the CH4 production, oxidation, transportation and calculation. Also try to suggest the CH4 mitigation options of paddy fields. The mitigation of CH4 emission can be achieved by water management, selection of rice cultivar and fertilization. Controlled irrigation can also reduce CH4 production compared to flood irrigation. Cultivation of high-yielding and more heat-tolerant rice cultivars will be promising approach to reduce CH4 emissions and slow down the global warming.
Part of the book: Agrometeorology