Soil organic matter molecular composition and state of decomposition in three locations of the European Arctic
Increased mineralization of the organic matter (OM) stored in permafrost is expected to constitute the largest additional global warming potential from terrestrial ecosystems exposed to a warmer climate. Chemical composition of permafrost OM is thought to be a key factor controlling the sensitivity...
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Online Access: | http://hdl.handle.net/11250/2469671 https://doi.org/10.1007/s10533-017-0373-2 |
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ftunivmob:oai:nmbu.brage.unit.no:11250/2469671 2023-05-15T13:05:40+02:00 Soil organic matter molecular composition and state of decomposition in three locations of the European Arctic Pengerud, Annelene Dignac, Marie-France Certini, Giacomo Strand, Line Tau Forte, Claudia Rasse, Daniel 2017-09-15T18:21:18Z application/pdf http://hdl.handle.net/11250/2469671 https://doi.org/10.1007/s10533-017-0373-2 eng eng Biogeochemistry. 2017, 135 (3), 277-292. urn:issn:0168-2563 http://hdl.handle.net/11250/2469671 https://doi.org/10.1007/s10533-017-0373-2 cristin:1494233 Attribution-NonCommercial-NoDerivatives 4.0 Internasjonal http://creativecommons.org/licenses/by-nc-nd/4.0/deed.no CC-BY-NC-ND 277-292 135 Biogeochemistry 3 Journal article Peer reviewed 2017 ftunivmob https://doi.org/10.1007/s10533-017-0373-2 2021-09-23T20:15:02Z Increased mineralization of the organic matter (OM) stored in permafrost is expected to constitute the largest additional global warming potential from terrestrial ecosystems exposed to a warmer climate. Chemical composition of permafrost OM is thought to be a key factor controlling the sensitivity of decomposition to warming. Our objective was to characterise OM from permafrost soils of the European Arctic: two mineral soils—Adventdalen, Svalbard, Norway and Vorkuta, northwest Russia— and a ‘‘palsa’’ (ice-cored peat mound patterning in heterogeneous permafrost landscapes) soil in Neiden, northern Norway, in terms of molecular composition and state of decomposition. At all sites, the OM stored in the permafrost was at an advanced stage of decomposition, although somewhat less so in the palsa peat. By comparing permafrost and active layers, we found no consistent effect of depth or permafrost on soil organic matter (SOM) chemistry across sites. The permafrost-affected palsa peat displayed better preservation of plant material in the deeper layer, as indicated by increasing contribution of lignin carbon to total carbon with depth, associated to decreasing acid (Ac) to aldehyde (Al) ratio of the syringyl (S) and vanillyl (V) units, and increasing S/V and contribution of plant-derived sugars. By contrast, in Adventdalen, the Ac/Al ratio of lignin and the Alkyl C to O-alkyl C ratio in the NMR spectra increased with depth, which suggests less oxidized SOM in the active layer compared to the permafrost layer. In Vorkuta, SOM characteristics in the permafrost profile did not change substantially with depth, probably due to mixing of soil layers by cryoturbation. The composition and state of decomposition of SOM appeared to be site-specific, in particular bound to the prevailing organic or mineral nature of soil when attempting to predict the SOM proneness to degradation. The occurrence of processes such as palsa formation in organic soils and cryoturbation should be considered when up-scaling and predicting the responses of OM to climate change in arctic soils. acceptedVersion Article in Journal/Newspaper Adventdalen Arctic Climate change Global warming Ice Northern Norway Northwest Russia palsa permafrost Svalbard Vorkuta Open archive Norwegian University of Life Sciences: Brage NMBU Arctic Svalbard Norway Adventdalen ENVELOPE(16.264,16.264,78.181,78.181) Neiden ENVELOPE(29.377,29.377,69.696,69.696) Biogeochemistry 135 3 277 292 |
institution |
Open Polar |
collection |
Open archive Norwegian University of Life Sciences: Brage NMBU |
op_collection_id |
ftunivmob |
language |
English |
description |
Increased mineralization of the organic matter (OM) stored in permafrost is expected to constitute the largest additional global warming potential from terrestrial ecosystems exposed to a warmer climate. Chemical composition of permafrost OM is thought to be a key factor controlling the sensitivity of decomposition to warming. Our objective was to characterise OM from permafrost soils of the European Arctic: two mineral soils—Adventdalen, Svalbard, Norway and Vorkuta, northwest Russia— and a ‘‘palsa’’ (ice-cored peat mound patterning in heterogeneous permafrost landscapes) soil in Neiden, northern Norway, in terms of molecular composition and state of decomposition. At all sites, the OM stored in the permafrost was at an advanced stage of decomposition, although somewhat less so in the palsa peat. By comparing permafrost and active layers, we found no consistent effect of depth or permafrost on soil organic matter (SOM) chemistry across sites. The permafrost-affected palsa peat displayed better preservation of plant material in the deeper layer, as indicated by increasing contribution of lignin carbon to total carbon with depth, associated to decreasing acid (Ac) to aldehyde (Al) ratio of the syringyl (S) and vanillyl (V) units, and increasing S/V and contribution of plant-derived sugars. By contrast, in Adventdalen, the Ac/Al ratio of lignin and the Alkyl C to O-alkyl C ratio in the NMR spectra increased with depth, which suggests less oxidized SOM in the active layer compared to the permafrost layer. In Vorkuta, SOM characteristics in the permafrost profile did not change substantially with depth, probably due to mixing of soil layers by cryoturbation. The composition and state of decomposition of SOM appeared to be site-specific, in particular bound to the prevailing organic or mineral nature of soil when attempting to predict the SOM proneness to degradation. The occurrence of processes such as palsa formation in organic soils and cryoturbation should be considered when up-scaling and predicting the responses of OM to climate change in arctic soils. acceptedVersion |
format |
Article in Journal/Newspaper |
author |
Pengerud, Annelene Dignac, Marie-France Certini, Giacomo Strand, Line Tau Forte, Claudia Rasse, Daniel |
spellingShingle |
Pengerud, Annelene Dignac, Marie-France Certini, Giacomo Strand, Line Tau Forte, Claudia Rasse, Daniel Soil organic matter molecular composition and state of decomposition in three locations of the European Arctic |
author_facet |
Pengerud, Annelene Dignac, Marie-France Certini, Giacomo Strand, Line Tau Forte, Claudia Rasse, Daniel |
author_sort |
Pengerud, Annelene |
title |
Soil organic matter molecular composition and state of decomposition in three locations of the European Arctic |
title_short |
Soil organic matter molecular composition and state of decomposition in three locations of the European Arctic |
title_full |
Soil organic matter molecular composition and state of decomposition in three locations of the European Arctic |
title_fullStr |
Soil organic matter molecular composition and state of decomposition in three locations of the European Arctic |
title_full_unstemmed |
Soil organic matter molecular composition and state of decomposition in three locations of the European Arctic |
title_sort |
soil organic matter molecular composition and state of decomposition in three locations of the european arctic |
publishDate |
2017 |
url |
http://hdl.handle.net/11250/2469671 https://doi.org/10.1007/s10533-017-0373-2 |
long_lat |
ENVELOPE(16.264,16.264,78.181,78.181) ENVELOPE(29.377,29.377,69.696,69.696) |
geographic |
Arctic Svalbard Norway Adventdalen Neiden |
geographic_facet |
Arctic Svalbard Norway Adventdalen Neiden |
genre |
Adventdalen Arctic Climate change Global warming Ice Northern Norway Northwest Russia palsa permafrost Svalbard Vorkuta |
genre_facet |
Adventdalen Arctic Climate change Global warming Ice Northern Norway Northwest Russia palsa permafrost Svalbard Vorkuta |
op_source |
277-292 135 Biogeochemistry 3 |
op_relation |
Biogeochemistry. 2017, 135 (3), 277-292. urn:issn:0168-2563 http://hdl.handle.net/11250/2469671 https://doi.org/10.1007/s10533-017-0373-2 cristin:1494233 |
op_rights |
Attribution-NonCommercial-NoDerivatives 4.0 Internasjonal http://creativecommons.org/licenses/by-nc-nd/4.0/deed.no |
op_rightsnorm |
CC-BY-NC-ND |
op_doi |
https://doi.org/10.1007/s10533-017-0373-2 |
container_title |
Biogeochemistry |
container_volume |
135 |
container_issue |
3 |
container_start_page |
277 |
op_container_end_page |
292 |
_version_ |
1766390346253598720 |