Temperature response of permafrost soil carbon is attenuated by mineral protection
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 abou...
Published in: | Global Change Biology |
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2018
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Online Access: | https://doi.org/10.1111/gcb.14316 https://www.openagrar.de/receive/openagrar_mods_00044611 https://www.openagrar.de/servlets/MCRFileNodeServlet/openagrar_derivate_00018083/dn060325.pdf |
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ftopenagrar:oai:www.openagrar.de:openagrar_mods_00044611 2023-06-18T03:39:23+02:00 Temperature response of permafrost soil carbon is attenuated by mineral protection Gentsch, Norman Wild, Birgit Mikutta, Robert Čapek, Petr Diakova, Katka Schrumpf, Marion Turner, Stephanie Minnich, Cynthia Schaarschmidt, Frank Shibistova, Olga Schnecker, Jörg Urich, Tim Gittel, Antje Santruckova, Hana Barta, Jiri Lashchinskiy, Nikolay Fuß, Roland Richter, Andreas Guggenberger, Georg 2018 https://doi.org/10.1111/gcb.14316 https://www.openagrar.de/receive/openagrar_mods_00044611 https://www.openagrar.de/servlets/MCRFileNodeServlet/openagrar_derivate_00018083/dn060325.pdf eng eng Global Change Biology -- Global Change Biol -- 1354-1013 -- 1365-2486 -- 1281439-8 https://doi.org/10.1111/gcb.14316 https://www.openagrar.de/receive/openagrar_mods_00044611 https://www.openagrar.de/servlets/MCRFileNodeServlet/openagrar_derivate_00018083/dn060325.pdf only signed in user all rights reserved info:eu-repo/semantics/openAccess Text ddc:630 carbon mineralization -- incubation -- mineral-organic association -- permafrost soils -- radiocarbon -- temperature sensitivity article Text 2018 ftopenagrar https://doi.org/10.1111/gcb.14316 2023-06-04T23:06:22Z 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~c 9% of the bulk CO2 respiration as compared to a share of 63 ~c 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 (HFOC), clay-size minerals and Fe or Al oxyhydroxides. Temperature sensitivity (Q10) decreased with increasing soil depth from 2.4 to 1.4 in the bulk soil and from 2.9 to 1.5 in the HF. A concurrent increase in the metal-to-HF-OC ratios with soil depth suggests a stronger bonding of OM to minerals in the subsoil. There, the younger 14C signature in CO2 than that of the OC indicates a preferential decomposition of the more recent OM and the existence of a MOA fraction with limited access of OM to decomposers. These results indicate strong mineral controls on the decomposability of OM after permafrost thaw and on its temperature sensitivity. Thus, we here provide evidence that OM temperature sensitivity can be attenuated by MOA in permafrost soils. Article in Journal/Newspaper Arctic Climate change permafrost OpenAgrar (OA) Arctic Moa ENVELOPE(15.184,15.184,67.286,67.286) Global Change Biology 24 8 3401 3415 |
institution |
Open Polar |
collection |
OpenAgrar (OA) |
op_collection_id |
ftopenagrar |
language |
English |
topic |
Text ddc:630 carbon mineralization -- incubation -- mineral-organic association -- permafrost soils -- radiocarbon -- temperature sensitivity |
spellingShingle |
Text ddc:630 carbon mineralization -- incubation -- mineral-organic association -- permafrost soils -- radiocarbon -- temperature sensitivity Gentsch, Norman Wild, Birgit Mikutta, Robert Čapek, Petr Diakova, Katka Schrumpf, Marion Turner, Stephanie Minnich, Cynthia Schaarschmidt, Frank Shibistova, Olga Schnecker, Jörg Urich, Tim Gittel, Antje Santruckova, Hana Barta, Jiri Lashchinskiy, Nikolay Fuß, Roland Richter, Andreas Guggenberger, Georg Temperature response of permafrost soil carbon is attenuated by mineral protection |
topic_facet |
Text ddc:630 carbon mineralization -- incubation -- mineral-organic association -- permafrost soils -- radiocarbon -- temperature sensitivity |
description |
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~c 9% of the bulk CO2 respiration as compared to a share of 63 ~c 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 (HFOC), clay-size minerals and Fe or Al oxyhydroxides. Temperature sensitivity (Q10) decreased with increasing soil depth from 2.4 to 1.4 in the bulk soil and from 2.9 to 1.5 in the HF. A concurrent increase in the metal-to-HF-OC ratios with soil depth suggests a stronger bonding of OM to minerals in the subsoil. There, the younger 14C signature in CO2 than that of the OC indicates a preferential decomposition of the more recent OM and the existence of a MOA fraction with limited access of OM to decomposers. These results indicate strong mineral controls on the decomposability of OM after permafrost thaw and on its temperature sensitivity. Thus, we here provide evidence that OM temperature sensitivity can be attenuated by MOA in permafrost soils. |
format |
Article in Journal/Newspaper |
author |
Gentsch, Norman Wild, Birgit Mikutta, Robert Čapek, Petr Diakova, Katka Schrumpf, Marion Turner, Stephanie Minnich, Cynthia Schaarschmidt, Frank Shibistova, Olga Schnecker, Jörg Urich, Tim Gittel, Antje Santruckova, Hana Barta, Jiri Lashchinskiy, Nikolay Fuß, Roland Richter, Andreas Guggenberger, Georg |
author_facet |
Gentsch, Norman Wild, Birgit Mikutta, Robert Čapek, Petr Diakova, Katka Schrumpf, Marion Turner, Stephanie Minnich, Cynthia Schaarschmidt, Frank Shibistova, Olga Schnecker, Jörg Urich, Tim Gittel, Antje Santruckova, Hana Barta, Jiri Lashchinskiy, Nikolay Fuß, Roland Richter, Andreas Guggenberger, Georg |
author_sort |
Gentsch, Norman |
title |
Temperature response of permafrost soil carbon is attenuated by mineral protection |
title_short |
Temperature response of permafrost soil carbon is attenuated by mineral protection |
title_full |
Temperature response of permafrost soil carbon is attenuated by mineral protection |
title_fullStr |
Temperature response of permafrost soil carbon is attenuated by mineral protection |
title_full_unstemmed |
Temperature response of permafrost soil carbon is attenuated by mineral protection |
title_sort |
temperature response of permafrost soil carbon is attenuated by mineral protection |
publishDate |
2018 |
url |
https://doi.org/10.1111/gcb.14316 https://www.openagrar.de/receive/openagrar_mods_00044611 https://www.openagrar.de/servlets/MCRFileNodeServlet/openagrar_derivate_00018083/dn060325.pdf |
long_lat |
ENVELOPE(15.184,15.184,67.286,67.286) |
geographic |
Arctic Moa |
geographic_facet |
Arctic Moa |
genre |
Arctic Climate change permafrost |
genre_facet |
Arctic Climate change permafrost |
op_relation |
Global Change Biology -- Global Change Biol -- 1354-1013 -- 1365-2486 -- 1281439-8 https://doi.org/10.1111/gcb.14316 https://www.openagrar.de/receive/openagrar_mods_00044611 https://www.openagrar.de/servlets/MCRFileNodeServlet/openagrar_derivate_00018083/dn060325.pdf |
op_rights |
only signed in user all rights reserved info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1111/gcb.14316 |
container_title |
Global Change Biology |
container_volume |
24 |
container_issue |
8 |
container_start_page |
3401 |
op_container_end_page |
3415 |
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1769004143430598656 |