Methane emission from Thai paddy fields with special reference to Northeast sandy soils
1995
Duangsamorn Taja | Pongsiri Patcharapreecha | Wada, Hidenori (Khon Kaen Univ., Khon Kaen (Thailand). Research Annex. Faculty of Agriculture)
On the basis of field observations and laboratory experiments, the following hypothesis was proposed for methane emission from the rain-fed sandy paddy field in northeastern Thailand. The paddy field in the Northeast is usually plowed at the beginning of rainy season and submerged. Fresh plant debris (weeds and/or green manure plants) is incorporated into the submerged soil and is quickly decomposed in the submerged soil for a rather long period before rice planting. During this period, methane is actively emitted from the paddy field by spontaneous bubbling. At transplanting, the submerged soil is disturbed and the entrapped methane is bubbled out. In the later period, methane production in the soil is slowed down and a large part of the methane is kept in the soil by being entrapped. The entrapped methane is emitted mainly through the rice plant.
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