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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Online Access: | https://doi.org/10.1002/ppp.2039 |
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ftrepec:oai:RePEc:wly:perpro:v:31:y:2020:i:1:p:223-236 2023-05-15T14:52:32+02:00 Microbial carbon and nitrogen processes in high‐Arctic riparian soils Ada Pastor Sílvia Poblador Louis J. Skovsholt Tenna Riis https://doi.org/10.1002/ppp.2039 unknown https://doi.org/10.1002/ppp.2039 article ftrepec https://doi.org/10.1002/ppp.2039 2020-12-04T13:31:28Z 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 CO2 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‐NO3− 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 RePEc (Research Papers in Economics) Arctic Greenland Permafrost and Periglacial Processes 31 1 223 236 |
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Open Polar |
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RePEc (Research Papers in Economics) |
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ftrepec |
language |
unknown |
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 CO2 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‐NO3− 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 |
Ada Pastor Sílvia Poblador Louis J. Skovsholt Tenna Riis |
spellingShingle |
Ada Pastor Sílvia Poblador Louis J. Skovsholt Tenna Riis Microbial carbon and nitrogen processes in high‐Arctic riparian soils |
author_facet |
Ada Pastor Sílvia Poblador Louis J. Skovsholt Tenna Riis |
author_sort |
Ada Pastor |
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 |
url |
https://doi.org/10.1002/ppp.2039 |
geographic |
Arctic Greenland |
geographic_facet |
Arctic Greenland |
genre |
Arctic Climate change Greenland |
genre_facet |
Arctic Climate change Greenland |
op_relation |
https://doi.org/10.1002/ppp.2039 |
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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1766323768268947456 |