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Effects of a long‐term anoxic warming scenario on microbial community structure and functional potential of permafrost‐affected soil

Authors
/persons/resource/syang

Yang,  Sizhong
3.7 Geomicrobiology, 3.0 Geochemistry, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/sliebner

Liebner,  Susanne
3.7 Geomicrobiology, 3.0 Geochemistry, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Walz,  Josefine
External Organizations;

Knoblauch,  Christian
External Organizations;

Bornemann,  Till L. V.
External Organizations;

Probst,  Alexander J.
External Organizations;

/persons/resource/dwagner

Wagner,  D.
3.7 Geomicrobiology, 3.0 Geochemistry, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Jetten,  Mike S. M.
External Organizations;

in‘t Zandt,  Michiel H.
External Organizations;

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Citation

Yang, S., Liebner, S., Walz, J., Knoblauch, C., Bornemann, T. L. V., Probst, A. J., Wagner, D., Jetten, M. S. M., in‘t Zandt, M. H. (2021 online): Effects of a long‐term anoxic warming scenario on microbial community structure and functional potential of permafrost‐affected soil. - Permafrost and Periglacial Processes.
https://doi.org/10.1002/ppp.2131


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5007679
Abstract
Permafrost (PF)-affected soils are widespread in the Arctic and store about half the global soil organic carbon. This large carbon pool becomes vulnerable to microbial decomposition through PF warming and deepening of the seasonal thaw layer (active layer [AL]). Here we combined greenhouse gas (GHG) production rate measurements with a metagenome-based assessment of the microbial taxonomic and metabolic potential before and after 5 years of incubation under anoxic conditions at a constant temperature of 4C in the AL, PF transition layer, and intact PF.Warming led to a rapid initial release of CO2 and, to a lesser extent, CH4 in all layers. After the initial pulse, especially in CO2 production, GHG production rates declined and conditions became more methanogenic. Functional gene-based analyses indicated a decrease in carbonand nitrogen-cycling genes and a community shift to the degradation of less-labile organic matter. This study reveals low but continuous GHG production in long-term warming scenarios, which coincides with a decrease in the relative abundance of major metabolic pathway genes and an increase in carbohydrate-active enzyme classes.