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

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

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Laurent, Mélissa1, Autor
Fuchs, Matthias1, Autor
Herbst, Tanja1, Autor
Runge, Alexandra1, Autor
Liebner, Susanne2, Autor              
Treat, Claire C.1, Autor
Affiliations:
1External Organizations, ou_persistent22              
23.7 Geomicrobiology, 3.0 Geochemistry, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum, ou_146043              

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 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.

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Sprache(n): eng - Englisch
 Datum: 2023-06-062023
 Publikationsstatus: Final veröffentlicht
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 Identifikatoren: DOI: 10.5194/bg-20-2049-2023
GFZPOF: p4 T5 Future Landscapes
OATYPE: Gold Open Access
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Titel: Biogeosciences
Genre der Quelle: Zeitschrift, SCI, Scopus, oa
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Ort, Verlag, Ausgabe: -
Seiten: - Band / Heft: 20 (11) Artikelnummer: - Start- / Endseite: 2049 - 2064 Identifikator: CoNE: https://gfzpublic.gfz-potsdam.de/cone/journals/resource/journals47
Publisher: Copernicus