Climate-induced changes in nutrient transformations across landscape units in a thermokarst subarctic peatland
Across the circumpolar north, the degradation of permafrost has resulted in an increase in the extent of thermokarst landforms. Within thermally disturbed ecosystems, climatically driven changes to hydrology and temperature regimes have the potential to modify nutrient cycling processes. To assess t...
Published in: | Arctic, Antarctic, and Alpine Research |
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2018
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ftdoajarticles:oai:doaj.org/article:4fcf469dbcde4dfbace4a192aa1849c2 2023-05-15T14:14:30+02:00 Climate-induced changes in nutrient transformations across landscape units in a thermokarst subarctic peatland Matthew Q. Morison Merrin L. Macrae Richard M. Petrone LeeAnn Fishback 2018-01-01T00:00:00Z https://doi.org/10.1080/15230430.2018.1519366 https://doaj.org/article/4fcf469dbcde4dfbace4a192aa1849c2 EN eng Taylor & Francis Group http://dx.doi.org/10.1080/15230430.2018.1519366 https://doaj.org/toc/1523-0430 https://doaj.org/toc/1938-4246 1523-0430 1938-4246 doi:10.1080/15230430.2018.1519366 https://doaj.org/article/4fcf469dbcde4dfbace4a192aa1849c2 Arctic, Antarctic, and Alpine Research, Vol 50, Iss 1 (2018) nitrogen phosphorus nutrient cycling peatland thermokarst Environmental sciences GE1-350 Ecology QH540-549.5 article 2018 ftdoajarticles https://doi.org/10.1080/15230430.2018.1519366 2022-12-31T10:49:42Z Across the circumpolar north, the degradation of permafrost has resulted in an increase in the extent of thermokarst landforms. Within thermally disturbed ecosystems, climatically driven changes to hydrology and temperature regimes have the potential to modify nutrient cycling processes. To assess the impacts of changing moisture and thermal conditions on the mineralization of nutrients in the Hudson Bay Lowlands, subarctic Canada, soil cores were extracted along gradients of moisture and topographic position (peat plateaus, sedge lawns, channel fens, and thermokarst collapse scars). Soil subsamples were then subjected to a factorial design of temperature (4°C, 12°C, and 20°C) and moisture treatments (saturated, field moist, and air dried) in oxic conditions for three weeks. Nitrogen transformation rates were highly variable across landscape units (ranging from −1 to 96 μg N-NO3− and from −53 to 73 μg N-NH4+ g−1 dry soil for the incubation period). Shoreline collapse scar material showed the greatest potential for nitrification, with rates two orders of magnitude higher than other landscape positions, under warm (20°C) and saturated conditions. This work shows the potential of increased plant-available nitrate for rapid vegetative colonization of thermokarst collapse scars, and provides novel insight into nutrient cycling processes in permafrost peatland landscapes. Article in Journal/Newspaper Antarctic and Alpine Research Arctic Hudson Bay Peat permafrost Subarctic Thermokarst Directory of Open Access Journals: DOAJ Articles Canada Hudson Hudson Bay Arctic, Antarctic, and Alpine Research 50 1 e1519366 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
nitrogen phosphorus nutrient cycling peatland thermokarst Environmental sciences GE1-350 Ecology QH540-549.5 |
spellingShingle |
nitrogen phosphorus nutrient cycling peatland thermokarst Environmental sciences GE1-350 Ecology QH540-549.5 Matthew Q. Morison Merrin L. Macrae Richard M. Petrone LeeAnn Fishback Climate-induced changes in nutrient transformations across landscape units in a thermokarst subarctic peatland |
topic_facet |
nitrogen phosphorus nutrient cycling peatland thermokarst Environmental sciences GE1-350 Ecology QH540-549.5 |
description |
Across the circumpolar north, the degradation of permafrost has resulted in an increase in the extent of thermokarst landforms. Within thermally disturbed ecosystems, climatically driven changes to hydrology and temperature regimes have the potential to modify nutrient cycling processes. To assess the impacts of changing moisture and thermal conditions on the mineralization of nutrients in the Hudson Bay Lowlands, subarctic Canada, soil cores were extracted along gradients of moisture and topographic position (peat plateaus, sedge lawns, channel fens, and thermokarst collapse scars). Soil subsamples were then subjected to a factorial design of temperature (4°C, 12°C, and 20°C) and moisture treatments (saturated, field moist, and air dried) in oxic conditions for three weeks. Nitrogen transformation rates were highly variable across landscape units (ranging from −1 to 96 μg N-NO3− and from −53 to 73 μg N-NH4+ g−1 dry soil for the incubation period). Shoreline collapse scar material showed the greatest potential for nitrification, with rates two orders of magnitude higher than other landscape positions, under warm (20°C) and saturated conditions. This work shows the potential of increased plant-available nitrate for rapid vegetative colonization of thermokarst collapse scars, and provides novel insight into nutrient cycling processes in permafrost peatland landscapes. |
format |
Article in Journal/Newspaper |
author |
Matthew Q. Morison Merrin L. Macrae Richard M. Petrone LeeAnn Fishback |
author_facet |
Matthew Q. Morison Merrin L. Macrae Richard M. Petrone LeeAnn Fishback |
author_sort |
Matthew Q. Morison |
title |
Climate-induced changes in nutrient transformations across landscape units in a thermokarst subarctic peatland |
title_short |
Climate-induced changes in nutrient transformations across landscape units in a thermokarst subarctic peatland |
title_full |
Climate-induced changes in nutrient transformations across landscape units in a thermokarst subarctic peatland |
title_fullStr |
Climate-induced changes in nutrient transformations across landscape units in a thermokarst subarctic peatland |
title_full_unstemmed |
Climate-induced changes in nutrient transformations across landscape units in a thermokarst subarctic peatland |
title_sort |
climate-induced changes in nutrient transformations across landscape units in a thermokarst subarctic peatland |
publisher |
Taylor & Francis Group |
publishDate |
2018 |
url |
https://doi.org/10.1080/15230430.2018.1519366 https://doaj.org/article/4fcf469dbcde4dfbace4a192aa1849c2 |
geographic |
Canada Hudson Hudson Bay |
geographic_facet |
Canada Hudson Hudson Bay |
genre |
Antarctic and Alpine Research Arctic Hudson Bay Peat permafrost Subarctic Thermokarst |
genre_facet |
Antarctic and Alpine Research Arctic Hudson Bay Peat permafrost Subarctic Thermokarst |
op_source |
Arctic, Antarctic, and Alpine Research, Vol 50, Iss 1 (2018) |
op_relation |
http://dx.doi.org/10.1080/15230430.2018.1519366 https://doaj.org/toc/1523-0430 https://doaj.org/toc/1938-4246 1523-0430 1938-4246 doi:10.1080/15230430.2018.1519366 https://doaj.org/article/4fcf469dbcde4dfbace4a192aa1849c2 |
op_doi |
https://doi.org/10.1080/15230430.2018.1519366 |
container_title |
Arctic, Antarctic, and Alpine Research |
container_volume |
50 |
container_issue |
1 |
container_start_page |
e1519366 |
_version_ |
1766286930501173248 |