Methane Production and Its Fate in Paddy Fields : IV. Sources of Microorganisms and Substrates Responsible for Anaerobic Methane Oxidation in Subsoil

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A percolation experiment was conducted using soil columns to analyze the sources of microorganisms and organic materials responsible for anaerobic CH_4 oxidation in the subsoil of rice paddies. A glass column packed with plow layer soil and rice straw was connected to a column with sterilized or heated (550℃, 12 h) subsoil. Leachate was periodically collected from the bottom of the subsoil and analyzed for the contents of CH_4, ferrous iron, and carbon in the water soluble organic materials (TOC). Methane concentration in the leachate decreased by percolation into the subsoil. Sterilization and removal of organic materials from the subsoil did not affected appreciably the CH_4 content in the leachate from the subsoil column. Sterilization of the subsoil enhanced the leaching of TOC and ferrous iron from the subsoil and production of ferrous iron in the subsoil. Removal of organic materials from the subsoil decreased ferrous iron production in the subsoil. These observations suggested that CH_4 was oxidized in the subsoil by microorganism(s) appeared to use organic materials which were also leached from thee plow layer soil. Microorganisms and organic materials in the subsoil contributed to ferric iron reduction but not to CH_4 oxidation.
社団法人日本土壌肥料学会の論文