Relations entre spectres polliniques contemporains et topographie dans la vallée de la Coppermine, Territoires du Nord-Ouest
Thirty six moss polster samples from forest tundra and shrub tundra collected along the Coppermine River Valley, N.W.T., result in six pollen assemblages associated with type landforms. Forest sites on moderately steep slopes of approximately 12° yield spectra dominated by spruce. Spectra dominated...
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Canadian Science Publishing
1983
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Online Access: | http://dx.doi.org/10.1139/b83-066 http://www.nrcresearchpress.com/doi/pdf/10.1139/b83-066 |
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crcansciencepubl:10.1139/b83-066 2023-12-17T10:28:57+01:00 Relations entre spectres polliniques contemporains et topographie dans la vallée de la Coppermine, Territoires du Nord-Ouest Geurts, M.-A. 1983 http://dx.doi.org/10.1139/b83-066 http://www.nrcresearchpress.com/doi/pdf/10.1139/b83-066 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Botany volume 61, issue 2, page 586-593 ISSN 0008-4026 Plant Science journal-article 1983 crcansciencepubl https://doi.org/10.1139/b83-066 2023-11-19T13:39:32Z Thirty six moss polster samples from forest tundra and shrub tundra collected along the Coppermine River Valley, N.W.T., result in six pollen assemblages associated with type landforms. Forest sites on moderately steep slopes of approximately 12° yield spectra dominated by spruce. Spectra dominated by Salix (>50%) exist only at isolated sites where the shrub is the principal species found. Flat, well-drained surfaces on gentle slopes exposed to wind produce spectra dominated by more than 50% Betula. The assemblage Betula–Ericales corresponds to gentle slopes actively modified by cryogenic processes. The assemblages Betula–Salix and Salix–Betula are found on gentle, poorly drained slopes or in zones of shrub tundra where Salix is a pioneer species on surfaces newly exposed to weathering. The assemblage Betula–Picea is not a specific indicator since it is found on various topographic sites. The paper proposes one example of the utilization of these relationships between pollen spectra and landforms, for the interpretation of fossil pollen samples. This example shows that the variations in pollen spectra of a stratigraphic diagram do not exclusively reflect climatic variations or ecologic successions, but may be due to environmental change brought about by geomorphologic processes. Article in Journal/Newspaper Coppermine River Territoires du Nord-Ouest Tundra Canadian Science Publishing (via Crossref) Canadian Journal of Botany 61 2 586 593 |
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Canadian Science Publishing (via Crossref) |
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English |
topic |
Plant Science |
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Plant Science Geurts, M.-A. Relations entre spectres polliniques contemporains et topographie dans la vallée de la Coppermine, Territoires du Nord-Ouest |
topic_facet |
Plant Science |
description |
Thirty six moss polster samples from forest tundra and shrub tundra collected along the Coppermine River Valley, N.W.T., result in six pollen assemblages associated with type landforms. Forest sites on moderately steep slopes of approximately 12° yield spectra dominated by spruce. Spectra dominated by Salix (>50%) exist only at isolated sites where the shrub is the principal species found. Flat, well-drained surfaces on gentle slopes exposed to wind produce spectra dominated by more than 50% Betula. The assemblage Betula–Ericales corresponds to gentle slopes actively modified by cryogenic processes. The assemblages Betula–Salix and Salix–Betula are found on gentle, poorly drained slopes or in zones of shrub tundra where Salix is a pioneer species on surfaces newly exposed to weathering. The assemblage Betula–Picea is not a specific indicator since it is found on various topographic sites. The paper proposes one example of the utilization of these relationships between pollen spectra and landforms, for the interpretation of fossil pollen samples. This example shows that the variations in pollen spectra of a stratigraphic diagram do not exclusively reflect climatic variations or ecologic successions, but may be due to environmental change brought about by geomorphologic processes. |
format |
Article in Journal/Newspaper |
author |
Geurts, M.-A. |
author_facet |
Geurts, M.-A. |
author_sort |
Geurts, M.-A. |
title |
Relations entre spectres polliniques contemporains et topographie dans la vallée de la Coppermine, Territoires du Nord-Ouest |
title_short |
Relations entre spectres polliniques contemporains et topographie dans la vallée de la Coppermine, Territoires du Nord-Ouest |
title_full |
Relations entre spectres polliniques contemporains et topographie dans la vallée de la Coppermine, Territoires du Nord-Ouest |
title_fullStr |
Relations entre spectres polliniques contemporains et topographie dans la vallée de la Coppermine, Territoires du Nord-Ouest |
title_full_unstemmed |
Relations entre spectres polliniques contemporains et topographie dans la vallée de la Coppermine, Territoires du Nord-Ouest |
title_sort |
relations entre spectres polliniques contemporains et topographie dans la vallée de la coppermine, territoires du nord-ouest |
publisher |
Canadian Science Publishing |
publishDate |
1983 |
url |
http://dx.doi.org/10.1139/b83-066 http://www.nrcresearchpress.com/doi/pdf/10.1139/b83-066 |
genre |
Coppermine River Territoires du Nord-Ouest Tundra |
genre_facet |
Coppermine River Territoires du Nord-Ouest Tundra |
op_source |
Canadian Journal of Botany volume 61, issue 2, page 586-593 ISSN 0008-4026 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/b83-066 |
container_title |
Canadian Journal of Botany |
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61 |
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2 |
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586 |
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593 |
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1785581206096576512 |