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Relationships between greenhouse gas production and landscape position during short-term permafrost thaw under anaerobic conditions in the Lena Delta

Urheber*innen

Laurent,  Mélissa
External Organizations;

Fuchs,  Matthias
External Organizations;

Herbst,  Tanja
External Organizations;

Runge,  Alexandra
External Organizations;

/persons/resource/sliebner

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

Treat,  Claire C.
External Organizations;

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5018479.pdf
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Zitation

Laurent, M., Fuchs, M., Herbst, T., Runge, A., Liebner, S., Treat, C. C. (2023): Relationships between greenhouse gas production and landscape position during short-term permafrost thaw under anaerobic conditions in the Lena Delta. - Biogeosciences, 20, 11, 2049-2064.
https://doi.org/10.5194/bg-20-2049-2023


Zitierlink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5018479
Zusammenfassung
Soils in the permafrost region have acted as carbon sinks for thousands of years. As a result of global warming, permafrost soils are thawing and will potentially release greenhouse gases (GHGs) such as methane (CH4) and carbon dioxide (CO2). However, small-scale spatial heterogeneities of GHG production have been neglected in previous incubation studies. Here, we used an anaerobic incubation experiment to simulate permafrost thaw along a transect from upland Yedoma to the floodplain on Kurungnakh Island. Potential CO2 and CH4 production was measured during incubation of the active layer and permafrost soils at 4 and 20 ∘C, first for 60 d (approximate length of the growing season) and then continuing for 1 year. An assessment of methanogen abundance was performed in parallel for the first 60 d. Yedoma samples from upland and slope cores remained in a lag phase during the growing season simulation, while those located in the floodplain showed high production of CH4 (6.5×103 µg CH4-C g−1 C) and CO2 (6.9×103 µg CO2-C g−1 C) at 20 ∘C. The Yedoma samples from the permafrost layer started producing CH4 after 6 months of incubation. We conclude that landscape position is a key factor triggering CH4 production during the growing season time on Kurungnakh Island.