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TECHNICAL REPORT
Wetlands and Aquatic Processes

Methane Production and Oxidation in an Anoxic Rice Soil as Influenced by Inorganic Redox Species

^a Division of Soil Science and Microbiology, Central Rice Research Institute, Cuttack 753 006, India
^b Kerala Forest Research Institute, Peechi 680 653 Kerala, India
^c CSIRO Div. of Soils and Cooperative Research Centre for Soil and Land Management, Private Main Bag No. 2, Glen Osmond, Adelaide SA 5064, Australia

* Corresponding author (crrictc{at}ori.nic.in)

Received for publication August 31, 2000. The effects of addition of inorganic redox substances (species of NO^-₃, Mn⁴⁺, Fe³⁺, and SO^2-₄) on methane production and oxidation in anoxic rice (Oryza sativa L.) soil samples were examined. Sulfate was the most inhibitory for methane production followed by Fe³⁺, NO^-₃, and Mn⁴⁺, in that order. Addition of rice straw at a rate of 1% (w/w) as a carbon source to increase the electron donor to the electron acceptor ratio did not completely alleviate the inhibitory effects of redox species on methane production. Interestingly, laboratory incubation studies showed that addition of MnO₂ and K₂SO₄ enhanced aerobic methane oxidation in soil samples held at 60% water holding capacity. The suspensions of pretreated soil samples with different redox species, when tested for their ability to oxidize methane in soil solution equivalent medium supplemented with respective redox species under aerobic and anaerobic conditions showed differential effects of redox species. Nitrate and Fe³⁺ stimulated methane oxidation under anaerobic conditions and retarded it under aerobic conditions. Manganese(IV) ion retarded methane oxidation under anaerobic conditions, but enhanced it under aerobic conditions. However, SO^2-₄ stimulated methane oxidation in soil solution equivalent medium under both aerobic and anaerobic conditions.

Abbreviations: sMMO, soluble methane monooxygenase

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