Abstract
Anaerobic reoxidation of reduced products in paddy soils was investigated. Ferrous iron (Fe2+) and monosulfide ion (S2–) added to the soil chemically reduced MnO2 to Mn2+, and MnO2 and Fe(OH)3 to Mn2+ and Fe2+, respectively, where Fe2+ and S2– were considered to be oxidized to Fe3+ and S0. Elemental sulfur was oxidized to sulfate by anaerobic incubation with NO3– MnO2 and Fe(OH)3. A new conceptual model for the reduction processes in submerged paddy soil including the reoxidation processes of reduced products, in which soil heterogeneity in paddy fields was taken into consideration, was proposed based on the results.
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