From fibrous plant residues to mineral-associated organic carbon - The fate of organic matter in Arctic permafrost soils.
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...
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Copernicus Gesellschaft Mbh
2020
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fthzmuenchen:oai:opus-zb.helmholtz-muenchen.de:59729 2023-05-15T14:54:23+02:00 From fibrous plant residues to mineral-associated organic carbon - The fate of organic matter in Arctic permafrost soils. Prater, I. Zubrzycki, S. Buegger, F. Zoor-Fuellgraff, L.C. Angst, G. Dannenmann, M. Mueller, C.W. 2020-01-01 application/pdf https://push-zb.helmholtz-muenchen.de/frontdoor.php?source_opus=59729 https://doi.org/10.5194/bg-17-3367-2020 eng eng Copernicus Gesellschaft Mbh info:eu-repo/semantics/altIdentifier/doi/10.5194/bg-17-3367-2020 info:eu-repo/semantics/altIdentifier/wos/WOS:000547397000001 info:eu-repo/semantics/altIdentifier/isbn/1726-4170 info:eu-repo/semantics/altIdentifier/pissn/1726-4170 info:eu-repo/semantics/ https://push-zb.helmholtz-muenchen.de/frontdoor.php?source_opus=59729 doi:10.5194/bg-17-3367-2020 urn:isbn:1726-4170 urn:issn:1726-4170 urn:issn:1726-4189 info:eu-repo/semantics/openAccess Biogeosciences 17, 3367-3383 (2020) Text info:eu-repo/semantics/article 2020 fthzmuenchen https://doi.org/10.5194/bg-17-3367-2020 2022-11-20T09:09:55Z 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 mineralassociated SOM, we analyzed the elemental, isotopic and chemical composition of particulate OM (POM) and claysized mineral-associated OM (MAOM).We demonstrate that the SOM fractions that contribute with about 17 kgCm-3 for more than 60% of the C stock are highly bioavailable and that most of this labile C can be assumed to be prone to mineralization under warming conditions. Thus, the amount of relatively stable, small occluded POM and claysized MAOM that currently accounts with about 10 kgCm-3 for about 40% of the C stock will most probably be crucial for the quantity of C protected from mineralization in these Arctic soils in a warmer future. Using15N as a proxy for nitrogen (N) balances indicated an important role of N inputs by biological N fixation, while gaseous N losses appeared less important. However, this could change, as with about 0.4 kgNm-3 one third of the N is present in bioavailable SOM fractions, which ... Article in Journal/Newspaper Arctic lena river permafrost PuSH - Publikationsserver des Helmholtz Zentrums München Arctic Biogeosciences 17 13 3367 3383 |
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Open Polar |
collection |
PuSH - Publikationsserver des Helmholtz Zentrums München |
op_collection_id |
fthzmuenchen |
language |
English |
description |
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 mineralassociated SOM, we analyzed the elemental, isotopic and chemical composition of particulate OM (POM) and claysized mineral-associated OM (MAOM).We demonstrate that the SOM fractions that contribute with about 17 kgCm-3 for more than 60% of the C stock are highly bioavailable and that most of this labile C can be assumed to be prone to mineralization under warming conditions. Thus, the amount of relatively stable, small occluded POM and claysized MAOM that currently accounts with about 10 kgCm-3 for about 40% of the C stock will most probably be crucial for the quantity of C protected from mineralization in these Arctic soils in a warmer future. Using15N as a proxy for nitrogen (N) balances indicated an important role of N inputs by biological N fixation, while gaseous N losses appeared less important. However, this could change, as with about 0.4 kgNm-3 one third of the N is present in bioavailable SOM fractions, which ... |
format |
Article in Journal/Newspaper |
author |
Prater, I. Zubrzycki, S. Buegger, F. Zoor-Fuellgraff, L.C. Angst, G. Dannenmann, M. Mueller, C.W. |
spellingShingle |
Prater, I. Zubrzycki, S. Buegger, F. Zoor-Fuellgraff, L.C. Angst, G. Dannenmann, M. Mueller, C.W. From fibrous plant residues to mineral-associated organic carbon - The fate of organic matter in Arctic permafrost soils. |
author_facet |
Prater, I. Zubrzycki, S. Buegger, F. Zoor-Fuellgraff, L.C. Angst, G. Dannenmann, M. Mueller, C.W. |
author_sort |
Prater, I. |
title |
From fibrous plant residues to mineral-associated organic carbon - The fate of organic matter in Arctic permafrost soils. |
title_short |
From fibrous plant residues to mineral-associated organic carbon - The fate of organic matter in Arctic permafrost soils. |
title_full |
From fibrous plant residues to mineral-associated organic carbon - The fate of organic matter in Arctic permafrost soils. |
title_fullStr |
From fibrous plant residues to mineral-associated organic carbon - The fate of organic matter in Arctic permafrost soils. |
title_full_unstemmed |
From fibrous plant residues to mineral-associated organic carbon - The fate of organic matter in Arctic permafrost soils. |
title_sort |
from fibrous plant residues to mineral-associated organic carbon - the fate of organic matter in arctic permafrost soils. |
publisher |
Copernicus Gesellschaft Mbh |
publishDate |
2020 |
url |
https://push-zb.helmholtz-muenchen.de/frontdoor.php?source_opus=59729 https://doi.org/10.5194/bg-17-3367-2020 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic lena river permafrost |
genre_facet |
Arctic lena river permafrost |
op_source |
Biogeosciences 17, 3367-3383 (2020) |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/bg-17-3367-2020 info:eu-repo/semantics/altIdentifier/wos/WOS:000547397000001 info:eu-repo/semantics/altIdentifier/isbn/1726-4170 info:eu-repo/semantics/altIdentifier/pissn/1726-4170 info:eu-repo/semantics/ https://push-zb.helmholtz-muenchen.de/frontdoor.php?source_opus=59729 doi:10.5194/bg-17-3367-2020 urn:isbn:1726-4170 urn:issn:1726-4170 urn:issn:1726-4189 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/bg-17-3367-2020 |
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Biogeosciences |
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17 |
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13 |
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3367 |
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3383 |
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1766326093997932544 |