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Lab. of Applied Physical Chemistry, Faculty Agricultural and Applied Biological Sciences, Univ. of Ghent, Coupure 653, B-9000 Gent, Belgium.
* Corresponding author (oswald.vancleemput{at}rug.ac.be).
ABSTRACT
Well-managed, aerated cover soils can have a mitigating effect on methane emission from landfills. The influence of moisture content, soil temperature, and N on the methane uptake capacity of a neutral landfill cover soil was examined. A soil moisture content of 15% w/w gave the maximum CH4 oxidation rate (2.36 ng CH4 h–1 g–1 soil). When wetter, CH4 consumption was slower (e.g., 1.6 ng CH4 h–1 g–1 at 30% w/w) because of a limited gas diffusion. At lower soil moisture, microbial activity was reduced and consequently the oxidation capacity decreased (e.g., 0.84 ng CH4 h–1 g–1 at 5% w/w). Optimum temperature was between 25 and 30°C. The calculated activation energy of the CH4 oxidation was 56.5 kJ K–1 mol–1. After NH+4 addition, a negative linear correlation was found between the methane oxidation rate and the nitrous oxide flux (R2 = 0.96, Y1 = 2.7 – 0.44 x Y2). Addition of NO–3 had no significant effect on CH4 oxidation. The effect of organic residue amendments depended on their C/N ratios. Crop residues with a high C/N ratio (wheat [Triticum sativum L.] and maize [Zea mays L.] straw) stimulated N-immobilization and did not affect the methane-oxidizing capacity. On the other hand, addition of crop residues with low C/N ratios (potato [Solanum tuberosum L.] and sugar beet [Beta vulgaris cv. Altissima] leaves) stimulated N-mineralization, resulting in a strong inhibition of the methane oxidation.
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