Articles | Volume 20, issue 17
https://doi.org/10.5194/bg-20-3625-2023
https://doi.org/10.5194/bg-20-3625-2023
Research article
 | 
31 Aug 2023
Research article |  | 31 Aug 2023

Fractionation of stable carbon isotopes during microbial propionate consumption in anoxic rice paddy soils

Ralf Conrad and Peter Claus

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Short summary
Knowledge of carbon isotope fractionation is important for the assessment of the pathways involved in the degradation of organic matter. Propionate is an important intermediate. In the presence of sulfate, it was degraded by Syntrophobacter species via acetate to CO2. In the absence of sulfate, it was mainly consumed by Smithella and methanogenic archaeal species via butyrate and acetate to CH4. However, stable carbon isotope fractionation during the degradation process was quite small.
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