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From fibrous plant residues to mineral-associated organic carbon – the fate of organic matter in Arctic permafrost soils

Prater, Isabel; Zubrzycki, Sebastian; Buegger, Franz; Zoor-Füllgraff, Lena C.; Angst, Gerrit; Dannenmann, Michael; Mueller, Carsten W.

Permafrost-affected soils of the Arctic account for 70 % or 727 Pg of the soil organic carbon (C) stored in the northern circumpolar permafrost region and therefore play a major role in the global C cycle. Most studies on the budgeting of C storage and the quality of soil organic matter (OM; SOM) in the northern circumpolar region focus on bulk soils. Thus, although there is a plethora of assumptions regarding differences in terms of C turnover or stability, little knowledge is available on the mechanisms stabilizing organic C in Arctic soils besides impaired decomposition due to low temperatures. To gain such knowledge, we investigated soils from Samoylov Island in the Lena River delta with respect to the composition and distribution of organic C among differently stabilized SOM fractions. The soils were fractionated according to density and particle size to obtain differently stabilized SOM fractions differing in chemical composition and thus bioavailability. To better understand the chemical alterations from plant-derived organic particles in these soils rich in fibrous plant residues to mineral-associated SOM, we analyzed the elemental, isotopic and chemical composition of particulate OM (POM) and clay-sized mineral-associated OM (MAOM). ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000122309
Veröffentlicht am 03.08.2020
DOI: 10.5194/bg-17-3367-2020
Zitationen: 3
Web of Science
Zitationen: 1
Zitationen: 4
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung - Atmosphärische Umweltforschung (IMK-IFU)
KIT-Zentrum Klima und Umwelt (ZKU)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2020
Sprache Englisch
Identifikator ISSN: 1726-4189
KITopen-ID: 1000122309
HGF-Programm 12.02.01 (POF III, LK 01) Effects of land use and climate change
Erschienen in Biogeosciences
Verlag Copernicus Publications
Band 17
Heft 13
Seiten 3367–3383
Vorab online veröffentlicht am 03.07.2020
Nachgewiesen in Web of Science
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