Carbon dioxide fluxes were more spatially and temporally consistent than were CH4 fluxes (Table 1). The chambers that exhibitedthe highest CO2 fluxes also displayed the highest CH4 emissionrates, suggesting biogas and CH4 oxidation are the two mainsources of CO2in these spots. The mean CO2 fluxes in summer inthis study were above maximum CO2 fluxes reported for a wide range of naturalsoils in temperate regions. The elevated CO2 fluxes observed in thisstudy are indicative of CH4 oxidation by the cover soils
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