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Characteristics of methane oxidation in a flooded rice soil profile

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Abstract

Laboratory experiments were conducted to study the variation of CH4 oxidation patterns in flooded rice soil profiles. The results indicated that surface soil presented the strongest CH4 oxidation activities as shown by the highest values of the two kinetic parameters of CH4 oxidation, Vmax and Km in the ecosystem without rice plants. Vmax and Km decreased significantly from top to bottom in the paddy rice soil profile, ranging from 12.5 to 1.2 µg h-1 g-1 and 165 to 4.1 µg g-1, respectively. In addition, we studied the effect of headspace N2, O2 and their ratio on CH4 emission and oxidation to provide information on the sensitivity of methanogens and methanotrophs to soil redox change resulted from gas transportation through arenchyma. Methane emission rate increased, however, CH4 oxidation rate decreased with a decrease of O2 concentration in the headspace. Headspace H2 increased CH4 emission rate substantially. In addition to H2 being a substrate for CH4 formation, the change of soil redox potential to a considerably low level H2 should also contribute to the increase in CH4 emission.

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Authors and Affiliations

  1. Wetland Biogeochemistry Institute, Louisiana State University, Baton Rouge, LA, 70803-7511, USA

    Z.P. Wang, D. Zeng & W.H. Patrick Jr.

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  1. Z.P. Wang
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  2. D. Zeng
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  3. W.H. Patrick Jr.
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Wang, Z., Zeng, D. & Patrick, W. Characteristics of methane oxidation in a flooded rice soil profile. Nutrient Cycling in Agroecosystems 49, 97–103 (1997). https://doi.org/10.1023/A:1009762409365

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  • DOI: https://doi.org/10.1023/A:1009762409365

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