Formation and emission of methane in rice soils: Experimental determination and modeling analysis. Final report
Rice paddy soils have been identified as a major source of methane emissions contributing to the observed atmospheric increase in methane. This points to the need for a method of quantifying and predicting methane emissions for the widely varying conditions used in rice agriculture throughout the world. In the present work, a mathematical model for estimating the emission of methane from rice paddy soils is developed and refined. Kinetic parameters for methanogenesis in a Louisiana rice soil are determined from laboratory data on methane production from acetic acid substrate. Use of a stirred reactor allows simultaneous measurement of acetate consumption and methane production while minimizing mass transfer limitations. An existing model for rice plant growth is utilized to provide data on the availability of root exudates as a carbon source for the methanogens. The final methane model includes the kinetic parameters, plant data, and estimated transport parameters. With adjustments in these parameters, it provides an acceptable match to field data.
- Research Organization:
- California Univ., Davis, CA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- FC03-90ER61010
- OSTI ID:
- 10102641
- Report Number(s):
- DOE/ER/61010-T9; ON: DE93040720
- Resource Relation:
- Other Information: PBD: 31 Aug 1993
- Country of Publication:
- United States
- Language:
- English
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