Fluxes and pools of methane in wetland rice soils with varying organic inputs
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Measurements of methane emission rates and concentrations in the soil were made during four growing seasons at the International Rice Research Institute in the Philippines, on plots receiving different levels of organic input. Fluxes were measured using the automated closed chambers system (total emission) and small chambers installed between plants (water surface flux). Concentrations of methane in the soil were measured by collecting soil cores including the gas phase (soil-entrapped methane) and by sampling soil solution in situ (dissolved methane). There was much variability between seasons, but total fluxes from plots receiving high organic inputs (16–24 g CH4 m−2) always exceeded those from the low input plots (3–9 g CH4 m−2). The fraction of the total emission emerging from the surface water (presumably dominated by ebullition) was greater during the first part of the season, and greater from the high organic input plots (35–62%) than from the low input plots (15–23%). Concentrations of dissolved and entrapped methane in the low organic input plots increased gradually throughout the season; in the high input plots there was an early-season peak which was also seen in emissions. On both treatments, periods of high methane concentrations in the soil coincided with high rates of water surface flux whereas low concentrations of methane were generally associated with low flux rates.
KeywordsMethane Methane Emission Methane Concentration Total Emission International Rice Research Institute
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- de Bont, J. A. M., Lees, K. K. and Bouldin, D. F.: 1978, ‘Bacterial oxidation of Methane in a Rice Paddy’, Ecol. Bull. 26, 91–96.Google Scholar
- Conrad, R. and Rotfuss, F.: 1991. ‘Methane Oxidation in the Soil Surface Layer of a Flooded Rice Fields and the Effect of Ammonium’, Biol. Fertil. of Soils 12, 28–32.Google Scholar
- Higgins, I. J., Best, D. J., Hammond, R. C. and Scott, D. C.: 1981, ‘Methane-Oxidizing Microorganisms’, Microbiol. Rev. 45, 556–590.Google Scholar
- Holzapfel-Pschorn, A., Conrad, R. and Seiler, W.: 1985, ‘Production, Oxidation, and Emission of Methane in Rice Paddiess’, FEMS Microbiol. Ecol. 31, 149–158.Google Scholar
- Neue, H. U., Lantin, R. L., Wassmann, R., Aduna, J. B., Alberto, M. C. R. and Andales, M. J. F.: 1994, ‘Methane Emission from Rice Soils of the Philippines’ in: Minami, K. Mosier, S. R. and Sass, R. L. (eds.), CH 4 and N 2 O-Global Emissions and Controls from Rice Fields and Other Agricultural and Industrial Sources, NIAES Series 2, Tokyo, Japan, pp. 55–77.Google Scholar
- Sass, R. L., Fischer, F. M., Harcombe, P. A. and Turner, F. T.: 1991, ‘Methane Production and Enission in a Texas Rice Field’, Global Biogeochem. Cycles 4, 47–68.Google Scholar
- Wassmann, R., Papen, H. and Rennenberg, H.: 1993a, ‘Methane Emission from Rice Paddies and Possible Mitigation Options’, Chemosphere 26, 201–217.Google Scholar
- Wassmann, R., Wang, M. X., Shangguan, X. J., Xie, X. L., Shen, R. X., Papen, H., Rennenberg, H. and Seiler, W.: 1993b, ‘First Records of a Field Experiment on Fertilizer Effect on Methane Emission from Rice Fields in Human province (PR China)’, Geophys. Res. Lett. 20, 2071–2074.Google Scholar
- Wassmann, R., Neue, H. U., Lantin, R. S., Aduna, J. B., Alberto, M. C. R., Andales, M. J., Tan, M. J., Denier van der Gon, H. A. C., Hoffmann, H., Papen, H., Rennenberg, H. and Seiler, W.: 1994, ‘Temporal Patterns of Methane Emissions from Wetland Ricefields Treated by Different Modes of N Application’, J. Geophys. Res. 99, 16457–16462.Google Scholar
- Yagi, K. and Minami, K.: 1990. ‘Effects of Organic Matter Applications on Methane Emission From Japanese Paddy Fields’, Soil Sc. Plant Nutr. 36, 599–610.Google Scholar