Evaluation of CH4 Emission in Two Paddy Field Areas, Khonkaen and Ayutthaya, in Thailand

In anthropogenic activities, flooded paddy field is one of those events that emits CH4 and that comes the necessity of leveling down CH4 production from soil so the study on mechanisms of CH4 production in paddy soil is vital. This study was conducted for an aim of investigating CH4 influential factors in wide range of soil texture in paddy soil in Thailand and interrogating a model for predicted CH4 production potential map. Our result showed that soil carbon and sandy soil are the important factors generating CH4 production. To be exact, soil carbon works as a provider that implements an energy to soil microorganism to anoxically produce CH4 and sandy soil, that carries less iron oxide, accelerates the CH4 production. In conclusion, CH4 production in paddy field under flooding period is triggered when large amount of soil carbon exists, and the reduction being processed quickly due to a smaller number of iron oxide in the soil, especially sandy soil. The knowledge of factors influencing CH4 production brings about a better crop and water management. Further than that, predicted map of CH4 production potential can be utilized to identify whereabout of highly emitted CH4 production potential, which attention should be paid.