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Influence of oxygen on production and consumption of nitric oxide in soil

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Summary

NO and N2O release rates were measured in an acidic forest soil (pH 4.0) and a slightly alkaline agricultural soil (pH 7.8), which were incubated at different O2 concentrations (<0.01 – 20% O2) and at different NO concentrations (40 – 1000 ppbv NO). The system allowed the determination of simultaneously operating NO production rates and NO uptake rate constants, and the calculation of a NO compensation concentration. Both NO production and NO consumption decreased with increasing O2. NO consumption decreased to a smaller extent than NO production, so that the NO compensation concentrations also decreased. However, the NO compensation concentrations were not low enough for the soils to become a net sink for atmospheric NO. The release of N2O increased relative to NO release when the gases were allowed to accumulate instead of being flushed out. The forest soil contained only denitrifying, but not nitrifying bacteria, whereas the agricultural soil contained both. Nevertheless, NO release rates were less sensitive to O2 in the forest soil compared to the agricultural soil.

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  1. Fakultät für Biologie, Universität Konstanz, POB 5560, W-7750, Konstanz, Germany

    M. Krämer & R. Conrad

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  1. M. Krämer
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  2. R. Conrad
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Krämer, M., Conrad, R. Influence of oxygen on production and consumption of nitric oxide in soil. Biol Fertil Soils 11, 38–42 (1991). https://doi.org/10.1007/BF00335832

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