Microbial carbon and nitrogen processes in high-Arctic riparian soils
The aim of this work was to assess the biogeochemical role of riparian soils in the High Arctic to determine to what extent these soils may act as sources or sinks of carbon (C) and nitrogen (N). To do so, we compared two riparian areas that varied in riparian vegetation coverage and soil physical p...
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ftuniaarhuspubl:oai:pure.atira.dk:publications/33ce888d-54c0-4eab-b68b-4462cacd61df 2023-05-15T14:24:10+02:00 Microbial carbon and nitrogen processes in high-Arctic riparian soils Pastor, Ada Poblador, Sílvia Skovsholt, Louis J. Riis, Tenna 2020-01 https://pure.au.dk/portal/da/publications/microbial-carbon-and-nitrogen-processes-in-higharctic-riparian-soils(33ce888d-54c0-4eab-b68b-4462cacd61df).html https://doi.org/10.1002/ppp.2039 http://www.scopus.com/inward/record.url?scp=85077859773&partnerID=8YFLogxK eng eng info:eu-repo/semantics/restrictedAccess Pastor , A , Poblador , S , Skovsholt , L J & Riis , T 2020 , ' Microbial carbon and nitrogen processes in high-Arctic riparian soils ' , Permafrost and Periglacial Processes , vol. 31 , no. 1 , pp. 223-236 . https://doi.org/10.1002/ppp.2039 net nitrification net nitrogen mineralization soil organic matter soil respiration thermo-erosion gully article 2020 ftuniaarhuspubl https://doi.org/10.1002/ppp.2039 2022-04-27T22:51:44Z The aim of this work was to assess the biogeochemical role of riparian soils in the High Arctic to determine to what extent these soils may act as sources or sinks of carbon (C) and nitrogen (N). To do so, we compared two riparian areas that varied in riparian vegetation coverage and soil physical perturbation (i.e., thermo-erosion gully) in NE Greenland (74°N) during late summer. Microbial soil respiration (0.4–3.2 μmol CO 2 m −2 s −1 ) was similar to values previously found across vegetation types in the same area and increased with higher temperatures, soil column depth and soil organic C degradation. Riparian soils had low nitrate concentrations (0.02–0.64 μg N-NO 3 − g −1 ), negligible net nitrification rates and negative net N mineralization rates (−0.58 to 0.33 μg N g −1 day −1 ), thus indicating efficient microbial N uptake due to low N availability. We did not find any effects of physical perturbation on soil respiration or on N processing, but the dissolved fraction of organic matter in the soil was one order of magnitude lower on the disturbed site. Overall, our results suggest that riparian soils are small N sources to high-Arctic streams and that a depleted dissolved organic C pool in disturbed soils may decrease exports to the adjacent streams under climate change projection. Article in Journal/Newspaper Arctic Arctic Climate change Greenland Permafrost and Periglacial Processes Aarhus University: Research Arctic Greenland Permafrost and Periglacial Processes 31 1 223 236 |
institution |
Open Polar |
collection |
Aarhus University: Research |
op_collection_id |
ftuniaarhuspubl |
language |
English |
topic |
net nitrification net nitrogen mineralization soil organic matter soil respiration thermo-erosion gully |
spellingShingle |
net nitrification net nitrogen mineralization soil organic matter soil respiration thermo-erosion gully Pastor, Ada Poblador, Sílvia Skovsholt, Louis J. Riis, Tenna Microbial carbon and nitrogen processes in high-Arctic riparian soils |
topic_facet |
net nitrification net nitrogen mineralization soil organic matter soil respiration thermo-erosion gully |
description |
The aim of this work was to assess the biogeochemical role of riparian soils in the High Arctic to determine to what extent these soils may act as sources or sinks of carbon (C) and nitrogen (N). To do so, we compared two riparian areas that varied in riparian vegetation coverage and soil physical perturbation (i.e., thermo-erosion gully) in NE Greenland (74°N) during late summer. Microbial soil respiration (0.4–3.2 μmol CO 2 m −2 s −1 ) was similar to values previously found across vegetation types in the same area and increased with higher temperatures, soil column depth and soil organic C degradation. Riparian soils had low nitrate concentrations (0.02–0.64 μg N-NO 3 − g −1 ), negligible net nitrification rates and negative net N mineralization rates (−0.58 to 0.33 μg N g −1 day −1 ), thus indicating efficient microbial N uptake due to low N availability. We did not find any effects of physical perturbation on soil respiration or on N processing, but the dissolved fraction of organic matter in the soil was one order of magnitude lower on the disturbed site. Overall, our results suggest that riparian soils are small N sources to high-Arctic streams and that a depleted dissolved organic C pool in disturbed soils may decrease exports to the adjacent streams under climate change projection. |
format |
Article in Journal/Newspaper |
author |
Pastor, Ada Poblador, Sílvia Skovsholt, Louis J. Riis, Tenna |
author_facet |
Pastor, Ada Poblador, Sílvia Skovsholt, Louis J. Riis, Tenna |
author_sort |
Pastor, Ada |
title |
Microbial carbon and nitrogen processes in high-Arctic riparian soils |
title_short |
Microbial carbon and nitrogen processes in high-Arctic riparian soils |
title_full |
Microbial carbon and nitrogen processes in high-Arctic riparian soils |
title_fullStr |
Microbial carbon and nitrogen processes in high-Arctic riparian soils |
title_full_unstemmed |
Microbial carbon and nitrogen processes in high-Arctic riparian soils |
title_sort |
microbial carbon and nitrogen processes in high-arctic riparian soils |
publishDate |
2020 |
url |
https://pure.au.dk/portal/da/publications/microbial-carbon-and-nitrogen-processes-in-higharctic-riparian-soils(33ce888d-54c0-4eab-b68b-4462cacd61df).html https://doi.org/10.1002/ppp.2039 http://www.scopus.com/inward/record.url?scp=85077859773&partnerID=8YFLogxK |
geographic |
Arctic Greenland |
geographic_facet |
Arctic Greenland |
genre |
Arctic Arctic Climate change Greenland Permafrost and Periglacial Processes |
genre_facet |
Arctic Arctic Climate change Greenland Permafrost and Periglacial Processes |
op_source |
Pastor , A , Poblador , S , Skovsholt , L J & Riis , T 2020 , ' Microbial carbon and nitrogen processes in high-Arctic riparian soils ' , Permafrost and Periglacial Processes , vol. 31 , no. 1 , pp. 223-236 . https://doi.org/10.1002/ppp.2039 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1002/ppp.2039 |
container_title |
Permafrost and Periglacial Processes |
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31 |
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1 |
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223 |
op_container_end_page |
236 |
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