Short-term impacts of active layer detachments on carbon exchange in a High Arctic ecosystem, Cape bounty, Nunavut, Canada
Localized permafrost disturbances such as active layer detachments (ALDs) are increasing in frequency and severity across the Canadian Arctic impacting terrestrial ecosystem functioning. However, the contribution of permafrost disturbance-carbon feedbacks to the carbon (C) balance of Arctic ecosyste...
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ftgfzpotsdam:oai:gfzpublic.gfz-potsdam.de:item_5001125 2023-05-15T14:48:17+02:00 Short-term impacts of active layer detachments on carbon exchange in a High Arctic ecosystem, Cape bounty, Nunavut, Canada Beamish, A. Neil, A. Wagner, I. Scott, N. 2014 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5001125 unknown info:eu-repo/semantics/altIdentifier/doi/10.1007/s00300-014-1536-4 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5001125 Polar Biology info:eu-repo/semantics/article 2014 ftgfzpotsdam https://doi.org/10.1007/s00300-014-1536-4 2022-09-14T05:57:16Z Localized permafrost disturbances such as active layer detachments (ALDs) are increasing in frequency and severity across the Canadian Arctic impacting terrestrial ecosystem functioning. However, the contribution of permafrost disturbance-carbon feedbacks to the carbon (C) balance of Arctic ecosystems is poorly understood. Here, we explore the short-term impact of active layer detachments (ALDs) on carbon dioxide (CO2) exchange in a High Arctic semi-desert ecosystem by comparing midday C exchange between undisturbed areas, moderately disturbed areas (intact islands of vegetation within an ALD), and highly disturbed areas (non-vegetated areas due to ALD). Midday C exchange was measured using a static chamber method between June 23 and August 8 during the 2009 and 2010 growing seasons. Results show that areas of high disturbance had significantly reduced gross ecosystem exchange and ecosystem respiration (RE) compared to control and moderately disturbed areas. Moderately disturbed areas showed significantly enhanced net ecosystem exchange compared to areas of high disturbance, but were not significantly different from control areas. Disturbance did not significantly impact soil thermal, physical or chemical properties. According to average midday fluxes, ALDs as a whole (moderately disturbed areas: ?1.942 \ensuremath{μ}}mol m?2 s?1+ highly disturbed areas: 2.969 {\ensuremath{μ}}mol m?2 s?1) were a small CO2 source of 1.027 {\ensuremath{μ}}mol m?2 s?1 which did not differ significantly from average midday fluxes in control areas 1.219 {\ensuremath{μ}mol m?2 s?1. The findings of this study provide evidence that the short-term impacts of ALDs on midday, net C exchange and soil properties in a High Arctic semi-desert are minimal. Article in Journal/Newspaper Arctic Nunavut permafrost Polar Biology GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) Arctic Nunavut Canada Cape Bounty ENVELOPE(-109.542,-109.542,74.863,74.863) Polar Biology 37 10 1459 1468 |
institution |
Open Polar |
collection |
GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) |
op_collection_id |
ftgfzpotsdam |
language |
unknown |
description |
Localized permafrost disturbances such as active layer detachments (ALDs) are increasing in frequency and severity across the Canadian Arctic impacting terrestrial ecosystem functioning. However, the contribution of permafrost disturbance-carbon feedbacks to the carbon (C) balance of Arctic ecosystems is poorly understood. Here, we explore the short-term impact of active layer detachments (ALDs) on carbon dioxide (CO2) exchange in a High Arctic semi-desert ecosystem by comparing midday C exchange between undisturbed areas, moderately disturbed areas (intact islands of vegetation within an ALD), and highly disturbed areas (non-vegetated areas due to ALD). Midday C exchange was measured using a static chamber method between June 23 and August 8 during the 2009 and 2010 growing seasons. Results show that areas of high disturbance had significantly reduced gross ecosystem exchange and ecosystem respiration (RE) compared to control and moderately disturbed areas. Moderately disturbed areas showed significantly enhanced net ecosystem exchange compared to areas of high disturbance, but were not significantly different from control areas. Disturbance did not significantly impact soil thermal, physical or chemical properties. According to average midday fluxes, ALDs as a whole (moderately disturbed areas: ?1.942 \ensuremath{μ}}mol m?2 s?1+ highly disturbed areas: 2.969 {\ensuremath{μ}}mol m?2 s?1) were a small CO2 source of 1.027 {\ensuremath{μ}}mol m?2 s?1 which did not differ significantly from average midday fluxes in control areas 1.219 {\ensuremath{μ}mol m?2 s?1. The findings of this study provide evidence that the short-term impacts of ALDs on midday, net C exchange and soil properties in a High Arctic semi-desert are minimal. |
format |
Article in Journal/Newspaper |
author |
Beamish, A. Neil, A. Wagner, I. Scott, N. |
spellingShingle |
Beamish, A. Neil, A. Wagner, I. Scott, N. Short-term impacts of active layer detachments on carbon exchange in a High Arctic ecosystem, Cape bounty, Nunavut, Canada |
author_facet |
Beamish, A. Neil, A. Wagner, I. Scott, N. |
author_sort |
Beamish, A. |
title |
Short-term impacts of active layer detachments on carbon exchange in a High Arctic ecosystem, Cape bounty, Nunavut, Canada |
title_short |
Short-term impacts of active layer detachments on carbon exchange in a High Arctic ecosystem, Cape bounty, Nunavut, Canada |
title_full |
Short-term impacts of active layer detachments on carbon exchange in a High Arctic ecosystem, Cape bounty, Nunavut, Canada |
title_fullStr |
Short-term impacts of active layer detachments on carbon exchange in a High Arctic ecosystem, Cape bounty, Nunavut, Canada |
title_full_unstemmed |
Short-term impacts of active layer detachments on carbon exchange in a High Arctic ecosystem, Cape bounty, Nunavut, Canada |
title_sort |
short-term impacts of active layer detachments on carbon exchange in a high arctic ecosystem, cape bounty, nunavut, canada |
publishDate |
2014 |
url |
https://gfzpublic.gfz-potsdam.de/pubman/item/item_5001125 |
long_lat |
ENVELOPE(-109.542,-109.542,74.863,74.863) |
geographic |
Arctic Nunavut Canada Cape Bounty |
geographic_facet |
Arctic Nunavut Canada Cape Bounty |
genre |
Arctic Nunavut permafrost Polar Biology |
genre_facet |
Arctic Nunavut permafrost Polar Biology |
op_source |
Polar Biology |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1007/s00300-014-1536-4 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5001125 |
op_doi |
https://doi.org/10.1007/s00300-014-1536-4 |
container_title |
Polar Biology |
container_volume |
37 |
container_issue |
10 |
container_start_page |
1459 |
op_container_end_page |
1468 |
_version_ |
1766319375057420288 |