水管理が粗放的な農業用排水路におけるメタンの生成

摘要

In this study, distribution and production of the methane in the farm drainage were investigated in order to clarify the effect of careless water management of paddy field on the river. The dissolution CH_4 concentrations were 64-7.21x10~3 nM. GH_4 emission was 0-157 mmol/m~2/day and high in the sites where the mud sedimented over10 cm. These values were higher than CH_4 emission of the eutrophic lake, and close to the emission from the paddy field. It was indicated that the mud which flowout from the paddy field sedimented in the river, and the anaerobic environment formed in the river bed.