Soil Characteristics that Regulate Soil Reduction and Methane Production in Wetland Rice Soils
1997
Gaunt, J. L. | Grant, I. F. | Neue, H.-U. | Bragais, J. | Giller, K. E.
Methane production in soil is a microbiological process that occurs under strict anaerobic conditions. A laboratory incubation study was conducted using 10 wetland rice (Oryza sativa L.) soils from the Philippines to establish soil characteristics that govern the redox characteristics and CH₄ production of soils upon wetting. Labile soil organic matter in the Ap horizon was quantified as enrichment of C and N and non-clay-protected C and N fractions. The C/N ratio of the enriched fraction controlled the rate of reduction upon flooding, whereas the buffering capacity, measured as extractable Fe³⁺ content, controlled the reduction capacity for the soils. Methane production was influenced both by the reduction characteristics of the soils and labile organic substrates.
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