EGU21-16305
https://doi.org/10.5194/egusphere-egu21-16305
EGU General Assembly 2021
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

Microbial functional limitations and rhizosphere priming effect in permafrost

Sylvain Monteux and the co-authors*
Sylvain Monteux and the co-authors
  • *A full list of authors appears at the end of the abstract

Considering the potential positive feedback between climate warming and the release of greenhouse gases following the increased decomposition of the organic matter stored in permafrost soils as they thaw is an important challenge for the upcoming climate change assessments. While our understanding of physico-chemical constraints on thawing permafrost SOM decomposition has vastly improved since IPCC’s fifth assessment report, biotic interactions can still be the source of large uncertainties. Here we discuss the effects of two biotic interactions in the context of thawing permafrost: rhizosphere priming effect and microbial functional limitations. Rhizosphere priming effects are still-unclear mechanisms that result in increased SOM decomposition rates in the vicinity of plant roots. We consider these effects through the PrimeSCale modeling framework, discussing its predictions and its limitations, in particular which observations and data should be acquired to further improve it. Microbial functional limitations were recently evidenced in permafrost microbial communities and consist in missing or impaired functions, likely due to strong environmental filtering over millennial time-scales. We present what this mechanism can imply in terms of permafrost soil functioning and briefly discuss what could be the next steps before its inclusions in modeling efforts.

co-authors:

Frida Keuper, Birgit Wild, Christian Beer, Gesche Blume-Werry, Sébastien Fontaine, Konstantin Gavazov, Norman Gentsch, Georg Guggenberger, Sara Hallin, Gustaf Hugelius, Mika Jalava, Jaanis Juhanson, Charles Koven, Eveline J. Krab, Peter Kuhry, Matti Kummu, Sandrine Revaillot, Andreas Richter, Tanvir Shahzad, Erik Verbruggen, Josefine Walz, James T. Weedon, Ellen Dorrepaal

How to cite: Monteux, S. and the co-authors: Microbial functional limitations and rhizosphere priming effect in permafrost, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-16305, https://doi.org/10.5194/egusphere-egu21-16305, 2021.

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