Microbial carbon and nitrogen processes in high‐Arctic riparian soils
Abstract 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 p...
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crwiley:10.1002/ppp.2039 2024-06-02T08:01:25+00:00 Microbial carbon and nitrogen processes in high‐Arctic riparian soils Pastor, Ada Poblador, Sílvia Skovsholt, Louis J. Riis, Tenna European Cooperation in Science and Technology Fundación Ramón Areces Carlsbergfondet 2020 http://dx.doi.org/10.1002/ppp.2039 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fppp.2039 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ppp.2039 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/ppp.2039 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Permafrost and Periglacial Processes volume 31, issue 1, page 223-236 ISSN 1045-6740 1099-1530 journal-article 2020 crwiley https://doi.org/10.1002/ppp.2039 2024-05-03T11:58:09Z Abstract 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 Climate change Greenland Permafrost and Periglacial Processes Wiley Online Library Arctic Greenland Permafrost and Periglacial Processes 31 1 223 236 |
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English |
description |
Abstract 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. |
author2 |
European Cooperation in Science and Technology Fundación Ramón Areces Carlsbergfondet |
format |
Article in Journal/Newspaper |
author |
Pastor, Ada Poblador, Sílvia Skovsholt, Louis J. Riis, Tenna |
spellingShingle |
Pastor, Ada Poblador, Sílvia Skovsholt, Louis J. Riis, Tenna Microbial carbon and nitrogen processes in high‐Arctic riparian soils |
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 |
publisher |
Wiley |
publishDate |
2020 |
url |
http://dx.doi.org/10.1002/ppp.2039 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fppp.2039 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ppp.2039 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/ppp.2039 |
geographic |
Arctic Greenland |
geographic_facet |
Arctic Greenland |
genre |
Arctic Climate change Greenland Permafrost and Periglacial Processes |
genre_facet |
Arctic Climate change Greenland Permafrost and Periglacial Processes |
op_source |
Permafrost and Periglacial Processes volume 31, issue 1, page 223-236 ISSN 1045-6740 1099-1530 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
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 |
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236 |
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1800745782903570432 |