Diurnal and seasonal variations of tundra CO2 emissions in a polygonal peatland near Salluit, Nunavik, Canada
Polygonal peatlands are carbon-rich permafrost ecosystems that will likely be significantly affected by climate change. However, studies are often constrained to one measurement per day, which impedes assessments of the temporal variability in carbon fluxes. For this reason, we measured ecosystem re...
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ftdoajarticles:oai:doaj.org/article:27d8ce92356143d3987c0683ae510056 2023-05-15T14:23:39+02:00 Diurnal and seasonal variations of tundra CO2 emissions in a polygonal peatland near Salluit, Nunavik, Canada Samuel Gagnon Michel Allard Aurélien Nicosia 2018-03-01T00:00:00Z https://doi.org/10.1139/as-2016-0045 https://doaj.org/article/27d8ce92356143d3987c0683ae510056 EN FR eng fre Canadian Science Publishing https://doi.org/10.1139/as-2016-0045 https://doaj.org/toc/2368-7460 doi:10.1139/as-2016-0045 2368-7460 https://doaj.org/article/27d8ce92356143d3987c0683ae510056 Arctic Science, Vol 4, Iss 1, Pp 1-15 (2018) permafrost tundra polygonal peatland carbon dioxide water table Environmental sciences GE1-350 Environmental engineering TA170-171 article 2018 ftdoajarticles https://doi.org/10.1139/as-2016-0045 2022-12-31T07:21:28Z Polygonal peatlands are carbon-rich permafrost ecosystems that will likely be significantly affected by climate change. However, studies are often constrained to one measurement per day, which impedes assessments of the temporal variability in carbon fluxes. For this reason, we measured ecosystem respiration (ER) of CO2 in a polygonal peatland underlain by continuous permafrost over an entire growing season to determine the effects of temperature and water table depth on the temporal variability of ER. We used four automated closed chambers to measure ER under varying temperature and soil moisture regimes. Temporal variability was approximately the same for the four plots, on both a diurnal and a seasonal scale. Both diurnal and seasonal variations in ER were strongly controlled by changes in soil surface temperature. Fluctuations of the water table depth associated with important rainfall events was also an important factor affecting ER on the seasonal scale. We found that water table level fluctuations below 20–25 cm did not significantly affect ER and that most soil respiration took place in the top 10 cm, likely in the surface 2 cm. Our results highlight the importance of monitoring future changes in tundra hydrology, which will determine the depth of organic matter available for aerobic decomposition. Article in Journal/Newspaper Arctic permafrost Salluit Tundra Nunavik Directory of Open Access Journals: DOAJ Articles Nunavik Canada Salluit ENVELOPE(-75.643,-75.643,62.204,62.204) Arctic Science |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English French |
topic |
permafrost tundra polygonal peatland carbon dioxide water table Environmental sciences GE1-350 Environmental engineering TA170-171 |
spellingShingle |
permafrost tundra polygonal peatland carbon dioxide water table Environmental sciences GE1-350 Environmental engineering TA170-171 Samuel Gagnon Michel Allard Aurélien Nicosia Diurnal and seasonal variations of tundra CO2 emissions in a polygonal peatland near Salluit, Nunavik, Canada |
topic_facet |
permafrost tundra polygonal peatland carbon dioxide water table Environmental sciences GE1-350 Environmental engineering TA170-171 |
description |
Polygonal peatlands are carbon-rich permafrost ecosystems that will likely be significantly affected by climate change. However, studies are often constrained to one measurement per day, which impedes assessments of the temporal variability in carbon fluxes. For this reason, we measured ecosystem respiration (ER) of CO2 in a polygonal peatland underlain by continuous permafrost over an entire growing season to determine the effects of temperature and water table depth on the temporal variability of ER. We used four automated closed chambers to measure ER under varying temperature and soil moisture regimes. Temporal variability was approximately the same for the four plots, on both a diurnal and a seasonal scale. Both diurnal and seasonal variations in ER were strongly controlled by changes in soil surface temperature. Fluctuations of the water table depth associated with important rainfall events was also an important factor affecting ER on the seasonal scale. We found that water table level fluctuations below 20–25 cm did not significantly affect ER and that most soil respiration took place in the top 10 cm, likely in the surface 2 cm. Our results highlight the importance of monitoring future changes in tundra hydrology, which will determine the depth of organic matter available for aerobic decomposition. |
format |
Article in Journal/Newspaper |
author |
Samuel Gagnon Michel Allard Aurélien Nicosia |
author_facet |
Samuel Gagnon Michel Allard Aurélien Nicosia |
author_sort |
Samuel Gagnon |
title |
Diurnal and seasonal variations of tundra CO2 emissions in a polygonal peatland near Salluit, Nunavik, Canada |
title_short |
Diurnal and seasonal variations of tundra CO2 emissions in a polygonal peatland near Salluit, Nunavik, Canada |
title_full |
Diurnal and seasonal variations of tundra CO2 emissions in a polygonal peatland near Salluit, Nunavik, Canada |
title_fullStr |
Diurnal and seasonal variations of tundra CO2 emissions in a polygonal peatland near Salluit, Nunavik, Canada |
title_full_unstemmed |
Diurnal and seasonal variations of tundra CO2 emissions in a polygonal peatland near Salluit, Nunavik, Canada |
title_sort |
diurnal and seasonal variations of tundra co2 emissions in a polygonal peatland near salluit, nunavik, canada |
publisher |
Canadian Science Publishing |
publishDate |
2018 |
url |
https://doi.org/10.1139/as-2016-0045 https://doaj.org/article/27d8ce92356143d3987c0683ae510056 |
long_lat |
ENVELOPE(-75.643,-75.643,62.204,62.204) |
geographic |
Nunavik Canada Salluit |
geographic_facet |
Nunavik Canada Salluit |
genre |
Arctic permafrost Salluit Tundra Nunavik |
genre_facet |
Arctic permafrost Salluit Tundra Nunavik |
op_source |
Arctic Science, Vol 4, Iss 1, Pp 1-15 (2018) |
op_relation |
https://doi.org/10.1139/as-2016-0045 https://doaj.org/toc/2368-7460 doi:10.1139/as-2016-0045 2368-7460 https://doaj.org/article/27d8ce92356143d3987c0683ae510056 |
op_doi |
https://doi.org/10.1139/as-2016-0045 |
container_title |
Arctic Science |
_version_ |
1766296153294372864 |