Mitigating and Elucidating Net Emission of Greenhouse Gases at Rice Paddy Fields in Various Climatic Asian Regions

点击翻译按钮获取中文摘要

It was observed that the flux of greenhouse gases (CO_2, CH_4, N_2O) in rice paddy fields fluctuated diurnally because the activity of soil microbes might be affected by soil temperature. In comparison of GHG flux at rice paddy fields between in Japan and Thailand, however, it was suggested that the effects of management practices, e.g., fertilizer, in rice paddy fields might be larger than that of soil temperature on the emission and absorption of GHGs. Based on the simulation results using DNDC model, intermittent irrigation in a rice paddy field enhanced the emission of CO_2-equivalent and rice yield so that it was speculated that GHG emissions for unit rice yield would be minimized using the intermittent irrigation.