SSSAJ Journal of Natural Resources and Life Sciences Education
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Published in Soil Sci Soc Am J 61:1526-1531 (1997)
© 1997 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Soil Characteristics that Regulate Soil Reduction and Methane Production in Wetland Rice Soils

J. L. Gaunt*

IACR-Rothamsted, Harpenden, Hertfordshire AL5 2JQ, UK

I. F. Grant

Natural Resources Institute (NRI), Central Avenue, Chatham Maritime, Chatham, Kent ME4 4TB, UK

H. U. Neue and J. Bragais

The International Rice Research Institute (IRRI), P.O. Box 933, Manila 1099, Philippines

K. E. Giller

Wye College, Univ. of London, Wye, Nr Ashford, Kent, UK

*Corresponding author (john.gaunt{at}bbsrc.ac.uk).

ABSTRACT

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.

Received for publication May 23, 1994.


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