The initiation and development of small peat-forming ecosystems adjacent to lakes in the north central Canadian low arctic during the Holocene
Small peat-forming ecosystems in arctic landscapes may play a significant role in the regional biogeochemistry of high-latitude systems, yet they are understudied compared to arctic uplands and other major peat-forming regions of the North. We present a new data set of 25 radiocarbon-dated permafros...
Published in: | Journal of Geophysical Research: Biogeosciences |
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ftbowdoincollege:oai:digitalcommons.bowdoin.edu:eos-faculty-publications-1043 2023-05-15T14:43:18+02:00 The initiation and development of small peat-forming ecosystems adjacent to lakes in the north central Canadian low arctic during the Holocene Camill, Philip Umbanhowar, Charles E. Geiss, Christoph Edlund, Mark B. Hobbs, Will O. Dupont, Allison Doyle-Capitman, Catherine Ramos, Matthew 2017-07-01T07:00:00Z application/pdf https://digitalcommons.bowdoin.edu/eos-faculty-publications/44 https://digitalcommons.bowdoin.edu/cgi/viewcontent.cgi?article=1043&context=eos-faculty-publications unknown Bowdoin Digital Commons https://digitalcommons.bowdoin.edu/eos-faculty-publications/44 https://digitalcommons.bowdoin.edu/cgi/viewcontent.cgi?article=1043&context=eos-faculty-publications Earth and Oceanographic Science Faculty Work arctic carbon climate fire Holocene peat text 2017 ftbowdoincollege 2023-02-24T06:38:38Z Small peat-forming ecosystems in arctic landscapes may play a significant role in the regional biogeochemistry of high-latitude systems, yet they are understudied compared to arctic uplands and other major peat-forming regions of the North. We present a new data set of 25 radiocarbon-dated permafrost peat cores sampled around eight low arctic lake sites in northern Manitoba (Canada) to examine the timing of peat initiation and controls on peat accumulation throughout the Holocene. We used macrofossils and charcoal to characterize changes in the plant community and fire, and we explored potential impacts of these local factors, as well as regional climatic change, on rates of C accumulation and C stocks. Peat initiation was variable across and within sites, suggesting the influence of local topography, but 56% of the cores initiated after 3000 B.P. Most cores initiated and remained as drier bog hummock communities, with few vegetation transitions in this landscape. C accumulation was relatively slow and did not appear to be correlated with Holocene-scale climatic variability, but C stocks in this landscape were substantial (mean = 45.4 kg C m ), potentially accounting for 13.2 Pg C in the Taiga Shield ecozone. To the extent that small peat-forming systems are underrepresented in peatland mapping, soil organic carbon (SOC) stocks may be underestimated in arctic regions. Mean fire severity appeared to be negatively correlated with C accumulation rates. Initiation and accumulation of soil C may respond to both regional and local factors, and substantial lowland soil C stocks have the potential for biogeochemical impacts on adjacent aquatic ecosystems. −2 Text Arctic permafrost taiga Taiga shield Bowdoin College: Bowdoin Digital Commons Arctic Arctic Lake ENVELOPE(-130.826,-130.826,57.231,57.231) Canada Journal of Geophysical Research: Biogeosciences 122 7 1672 1688 |
institution |
Open Polar |
collection |
Bowdoin College: Bowdoin Digital Commons |
op_collection_id |
ftbowdoincollege |
language |
unknown |
topic |
arctic carbon climate fire Holocene peat |
spellingShingle |
arctic carbon climate fire Holocene peat Camill, Philip Umbanhowar, Charles E. Geiss, Christoph Edlund, Mark B. Hobbs, Will O. Dupont, Allison Doyle-Capitman, Catherine Ramos, Matthew The initiation and development of small peat-forming ecosystems adjacent to lakes in the north central Canadian low arctic during the Holocene |
topic_facet |
arctic carbon climate fire Holocene peat |
description |
Small peat-forming ecosystems in arctic landscapes may play a significant role in the regional biogeochemistry of high-latitude systems, yet they are understudied compared to arctic uplands and other major peat-forming regions of the North. We present a new data set of 25 radiocarbon-dated permafrost peat cores sampled around eight low arctic lake sites in northern Manitoba (Canada) to examine the timing of peat initiation and controls on peat accumulation throughout the Holocene. We used macrofossils and charcoal to characterize changes in the plant community and fire, and we explored potential impacts of these local factors, as well as regional climatic change, on rates of C accumulation and C stocks. Peat initiation was variable across and within sites, suggesting the influence of local topography, but 56% of the cores initiated after 3000 B.P. Most cores initiated and remained as drier bog hummock communities, with few vegetation transitions in this landscape. C accumulation was relatively slow and did not appear to be correlated with Holocene-scale climatic variability, but C stocks in this landscape were substantial (mean = 45.4 kg C m ), potentially accounting for 13.2 Pg C in the Taiga Shield ecozone. To the extent that small peat-forming systems are underrepresented in peatland mapping, soil organic carbon (SOC) stocks may be underestimated in arctic regions. Mean fire severity appeared to be negatively correlated with C accumulation rates. Initiation and accumulation of soil C may respond to both regional and local factors, and substantial lowland soil C stocks have the potential for biogeochemical impacts on adjacent aquatic ecosystems. −2 |
format |
Text |
author |
Camill, Philip Umbanhowar, Charles E. Geiss, Christoph Edlund, Mark B. Hobbs, Will O. Dupont, Allison Doyle-Capitman, Catherine Ramos, Matthew |
author_facet |
Camill, Philip Umbanhowar, Charles E. Geiss, Christoph Edlund, Mark B. Hobbs, Will O. Dupont, Allison Doyle-Capitman, Catherine Ramos, Matthew |
author_sort |
Camill, Philip |
title |
The initiation and development of small peat-forming ecosystems adjacent to lakes in the north central Canadian low arctic during the Holocene |
title_short |
The initiation and development of small peat-forming ecosystems adjacent to lakes in the north central Canadian low arctic during the Holocene |
title_full |
The initiation and development of small peat-forming ecosystems adjacent to lakes in the north central Canadian low arctic during the Holocene |
title_fullStr |
The initiation and development of small peat-forming ecosystems adjacent to lakes in the north central Canadian low arctic during the Holocene |
title_full_unstemmed |
The initiation and development of small peat-forming ecosystems adjacent to lakes in the north central Canadian low arctic during the Holocene |
title_sort |
initiation and development of small peat-forming ecosystems adjacent to lakes in the north central canadian low arctic during the holocene |
publisher |
Bowdoin Digital Commons |
publishDate |
2017 |
url |
https://digitalcommons.bowdoin.edu/eos-faculty-publications/44 https://digitalcommons.bowdoin.edu/cgi/viewcontent.cgi?article=1043&context=eos-faculty-publications |
long_lat |
ENVELOPE(-130.826,-130.826,57.231,57.231) |
geographic |
Arctic Arctic Lake Canada |
geographic_facet |
Arctic Arctic Lake Canada |
genre |
Arctic permafrost taiga Taiga shield |
genre_facet |
Arctic permafrost taiga Taiga shield |
op_source |
Earth and Oceanographic Science Faculty Work |
op_relation |
https://digitalcommons.bowdoin.edu/eos-faculty-publications/44 https://digitalcommons.bowdoin.edu/cgi/viewcontent.cgi?article=1043&context=eos-faculty-publications |
container_title |
Journal of Geophysical Research: Biogeosciences |
container_volume |
122 |
container_issue |
7 |
container_start_page |
1672 |
op_container_end_page |
1688 |
_version_ |
1766314977758543872 |