Effect of gas pressure in the root and stem base zone on methane transport through rice bodies

摘要: Ebullition of gas bubbles from the soil surface is, in some cases (e.g., early growth stage rice), one major pathways for methane transport rice paddies to atmosphere. However, role phase (entrapped gas) paddy plant-mediated transport, which is pathway emission, has not been clarified. To clarify effect below ground on emission rate through plants, we partly exposed root and stem base hydroponically grown a high concentration at various pressures, immersed rest roots solution with concentration. The was measured top plant using flow-through chamber method. drastically increased small increase pressure zone, about 3 times larger being observed 10 × 10-3 atm extra (corresponding cm standing water paddy) compared no pressure. when alginate applied near prevent contact phase, did increasing On other hand, observations paddy, it found that entrapped depth 1 cm) would come into direct part plant. Thus, could enter body directly beneath due resulting exerted by water. Hence, this mechanism involving play an important affecting as well ebullition bubbles.