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Abstract
A model experiment using soil columns was conducted to determine the site of methane production and decomposition (anaerobic oxidation) in the plow layer soil of paddy fields. Plow layer soil with or without rice straw was packed in a glass column consisting of two soil layers with different concentrations of rice straw. The column was submerged and the leachate was periodically collected. Methane content in the leachate from the upper layer soil with rice straw decreased by percolation through the lower layer of the soil without rice straw. This phenomenon was attributed to the presence of anaerobic methane oxidation in the lower layer. Water soluble organic carbon (TOC) responsible for the decomposition of rice straw was also consumed in the lower layer of soil. The contents of inorganic carbon and ferrous iron increased in the lower layer, reflecting the microbial consumption of methane and TOC. No significant differences in anaerobic methane oxidation were observed between the two soils used, while TOC consumption differed in each soil.
