Temperature response of permafrost soil carbon is attenuated by mineral protection

Global Change Biology
Norman GentschGeorg Guggenberger

Abstract

Climate change in Arctic ecosystems fosters permafrost thaw and makes massive amounts of ancient soil organic carbon (OC) available to microbial breakdown. However, fractions of the organic matter (OM) may be protected from rapid decomposition by their association with minerals. Little is known about the effects of mineral-organic associations (MOA) on the microbial accessibility of OM in permafrost soils and it is not clear which factors control its temperature sensitivity. In order to investigate if and how permafrost soil OC turnover is affected by mineral controls, the heavy fraction (HF) representing mostly MOA was obtained by density fractionation from 27 permafrost soil profiles of the Siberian Arctic. In parallel laboratory incubations, the unfractionated soils (bulk) and their HF were comparatively incubated for 175 days at 5 and 15°C. The HF was equivalent to 70 ± 9% of the bulk CO2 respiration as compared to a share of 63 ± 1% of bulk OC that was stored in the HF. Significant reduction of OC mineralization was found in all treatments with increasing OC content of the HF (HF-OC), clay-size minerals and Fe or Al oxyhydroxides. Temperature sensitivity (Q10) decreased with increasing soil depth from 2.4 to 1.4 in the bul...Continue Reading

References

Apr 16, 2010·Ecology·Kristiina KarhuJari Liski
Oct 8, 2011·Nature·Michael W I SchmidtSusan E Trumbore
Oct 12, 2012·Frontiers in Microbiology·Joshua P Schimel, Sean M Schaeffer
Apr 10, 2015·Nature·E A G SchuurJ E Vonk

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Citations

Nov 30, 2019·Global Change Biology·Yuwan WangGuoqiang Zhuang
Jan 17, 2021·FEMS Microbiology Ecology·Milan VarsadiyaJiří Bárta
Jan 7, 2022·World Journal of Microbiology & Biotechnology·Dinesh Sanka LoganathachettiK P Krishnan

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