Articles | Volume 12, issue 23
https://doi.org/10.5194/bg-12-7169-2015
https://doi.org/10.5194/bg-12-7169-2015
Research article
 | 
08 Dec 2015
Research article |  | 08 Dec 2015

Autotrophic fixation of geogenic CO2 by microorganisms contributes to soil organic matter formation and alters isotope signatures in a wetland mofette

M. E. Nowak, F. Beulig, J. von Fischer, J. Muhr, K. Küsel, and S. E. Trumbore

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Cited articles

Akob, D. M. and Küsel, K.: Where microorganisms meet rocks in the Earth's Critical Zone, Biogeosciences, 8, 3531–3543, https://doi.org/10.5194/bg-8-3531-2011, 2011.
Alewell, C., Giesler, R., Klaminder, J., Leifeld, J., and Rollog, M.: Stable carbon isotopes as indicators for environmental change in palsa peats, Biogeosciences, 8, 1769–1778, https://doi.org/10.5194/bg-8-1769-2011, 2011.
Alfreider, A., Vogt, C., Hoffmann, D., and Babel, W.: Diversity of ribulose-1,5-bisphosphate carboxylase/oxygenase large-subunit genes from groundwater and aquifer microorganisms, Microb. Ecol., 45, 317–328, 2003.
Amha, Y., Bohne, H., and Alsanius, B.: Comparison of physiological and biochemical methods for assessing microbial activity and biomass of peats, in: Peat: Formation, Uses and Biological Effects, 35–56, 2012.
Badger, M. R. and Bek, E. J.: Multiple Rubisco forms in proteobacteria: their functional significance in relation to CO2 acquisition by the CBB cycle, J. Exp. Bot., 59, 1525–1541, 2008.
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Short summary
Microorganisms have been recognized as an important source of soil organic matter (SOM). Autotrophic microorganisms utilize CO2 instead of organic carbon. Microbial CO2 fixation is accompanied with high 13C isotope discrimination. Because autotrophs are abundant in soils, they might be a significant factor influencing 13C signatures of SOM. Thus, it is important to asses the importance of autotrophs for C isotope signatures in soils, in order to use isotopes as a tracer for soil C dynamics.
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