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Interaction between Nitrous Oxide Formation and Methane Oxidation in Soils: Influence of Cation Exchange Phenomena

Laboratory of Applied Physical Chemistry, Faculty of Agricultural and Applied Biological Sciences; Univ. of Ghent, Coupure Links 653, B-9000 Gent, Belgium.

^* Corresponding author (oswald.vancleemput{at}rug.ac.be).

ABSTRACT

Ammonium (NH₊) inhibits the microbial oxidation of methane (CH₄), and gives rise to the formation of nitrous oxide (N₂O) in aerobic soils. However, the NH⁺₄ concentration in the soil water is not necessarily proportional to the total NH⁺₄ concentration in the soil, due to cation exchange or fixation phenomena. It was found that introducing the concept of ion exchange or fixation in kinetic models on CH₄ consumption and N₂O formation can increase our knowledge on these processes in soils. A fit of these kinetic models with experimental data showed a standard deviation of slightly more than 10%. The effects of NH⁺₄ on CH₄ oxidation and N₂O formation can only be compared in soils with the same cation exchange capacity (CEC).

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