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  Microbial dynamics in a High-Arctic glacier forefield: a combined field, laboratory, and modelling approach

Bradley, J., Arndt, S., Šabacká, M., Benning, L. G., Barker, G. L., Blacker, J. J., Yallop, M. L., Wright, K. E., Bellas, C. M., Telling, J., Tranter, M., Anesio, A. (2016): Microbial dynamics in a High-Arctic glacier forefield: a combined field, laboratory, and modelling approach. - Biogeosciences, 13, 5677-5696.
https://doi.org/10.5194/bg-13-5677-2016

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 Urheber:
Bradley, James1, Autor              
Arndt, Sandra2, Autor
Šabacká, Marie2, Autor
Benning, Liane G.3, Autor              
Barker, Gary L.2, Autor
Blacker, Joshua J.2, Autor
Yallop, Marian L.2, Autor
Wright, Katherine E.2, Autor
Bellas, Christopher M.2, Autor
Telling, Jonathan2, Autor
Tranter, Martyn2, Autor
Anesio, Alexandre2, Autor
Affiliations:
10 Pre-GFZ, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum, ou_146023              
2External Organizations, ou_persistent22              
34.4 Interface Geochemistry, 4.0 Geomaterials, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum, ou_754888              

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 Zusammenfassung: Modelling the development of soils in glacier forefields is necessary in order to assess how microbial and geochemical processes interact and shape soil development in response to glacier retreat. Furthermore, such models can help us predict microbial growth and the fate of Arctic soils in an increasingly ice-free future. Here, for the first time, we combined field sampling with laboratory analyses and numerical modelling to investigate microbial community dynamics in oligotrophic proglacial soils in Svalbard. We measured low bacterial growth rates and growth efficiencies (relative to estimates from Alpine glacier forefields) and high sensitivity of bacterial growth rates to soil temperature (relative to temperate soils). We used these laboratory measurements to inform parameter values in a new numerical model and significantly refined predictions of microbial and biogeochemical dynamics of soil development over a period of roughly 120 years. The model predicted the observed accumulation of autotrophic and heterotrophic biomass. Genomic data indicated that initial microbial communities were dominated by bacteria derived from the glacial environment, whereas older soils hosted a mixed community of autotrophic and heterotrophic bacteria. This finding was simulated by the numerical model, which showed that active microbial communities play key roles in fixing and recycling carbon and nutrients. We also demonstrated the role of allochthonous carbon and microbial necromass in sustaining a pool of organic material, despite high heterotrophic activity in older soils. This combined field, laboratory, and modelling approach demonstrates the value of integrated model–data studies to understand and quantify the functioning of the microbial community in an emerging High Arctic soil ecosystem.

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Sprache(n): eng - Englisch
 Datum: 2016
 Publikationsstatus: Final veröffentlicht
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 Identifikatoren: DOI: 10.5194/bg-13-5677-2016
GFZPOF: p3 PT3 Earth Surface and Climate Interactions
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Titel: Biogeosciences
Genre der Quelle: Zeitschrift, SCI, Scopus, oa
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Seiten: - Band / Heft: 13 Artikelnummer: - Start- / Endseite: 5677 - 5696 Identifikator: CoNE: https://gfzpublic.gfz-potsdam.de/cone/journals/resource/journals47