White spruce dynamics in the forest-tundra ecotone, the southwest Yukon Territory.
Dendrochronological techniques were used to study white spruce ( Picea glauca [Moech] Voss) dynamics in the altitudinal forest-tundra ecotone in the southwest Yukon Territory. At two sampling sites, all Picea glauca individuals within 9 delineated quadrats in the forest-tundra and forest were sample...
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Université d'Ottawa / University of Ottawa
2002
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ftdatacite:10.20381/ruor-14712 2023-05-15T18:39:33+02:00 White spruce dynamics in the forest-tundra ecotone, the southwest Yukon Territory. Ayotte, Nicole. 2002 https://dx.doi.org/10.20381/ruor-14712 http://www.ruor.uottawa.ca/handle/10393/6152 unknown Université d'Ottawa / University of Ottawa Biology, Ecology. Text Thesis article-journal ScholarlyArticle 2002 ftdatacite https://doi.org/10.20381/ruor-14712 2021-11-05T12:55:41Z Dendrochronological techniques were used to study white spruce ( Picea glauca [Moech] Voss) dynamics in the altitudinal forest-tundra ecotone in the southwest Yukon Territory. At two sampling sites, all Picea glauca individuals within 9 delineated quadrats in the forest-tundra and forest were sampled to estimate dates of establishment and growth variations using tree-ring chronologies. Regeneration in the forest-tundra ecotone was low from the late 1800s to the mid-1900s, however has increased since the 1920s. Recent peak periods of establishment parallel increased radial growth trends, which may have resulted from the long-term warming trend of the 20 th century. Seedling proximity to pre-established individuals in the forest-tundra ecotone suggests regeneration from a local seed source. Growth in height of pre-established krummholz individuals accelerated around the 1950s. Tree establishment in the forest-tundra and forest appear to be influenced by summer temperatures of the current growing season, and a high degree of similarity in tree growth at different sites in the southwest Yukon suggests a regional response to a large-climate signal. An increase in krummholz height and improved seedling establishment in the forest-tundra ecotone could result in a shift from krummholz to symmetrical trees and/or from patch forest to continuous forest. Thesis Tundra Yukon DataCite Metadata Store (German National Library of Science and Technology) Yukon |
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Open Polar |
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DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
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language |
unknown |
topic |
Biology, Ecology. |
spellingShingle |
Biology, Ecology. Ayotte, Nicole. White spruce dynamics in the forest-tundra ecotone, the southwest Yukon Territory. |
topic_facet |
Biology, Ecology. |
description |
Dendrochronological techniques were used to study white spruce ( Picea glauca [Moech] Voss) dynamics in the altitudinal forest-tundra ecotone in the southwest Yukon Territory. At two sampling sites, all Picea glauca individuals within 9 delineated quadrats in the forest-tundra and forest were sampled to estimate dates of establishment and growth variations using tree-ring chronologies. Regeneration in the forest-tundra ecotone was low from the late 1800s to the mid-1900s, however has increased since the 1920s. Recent peak periods of establishment parallel increased radial growth trends, which may have resulted from the long-term warming trend of the 20 th century. Seedling proximity to pre-established individuals in the forest-tundra ecotone suggests regeneration from a local seed source. Growth in height of pre-established krummholz individuals accelerated around the 1950s. Tree establishment in the forest-tundra and forest appear to be influenced by summer temperatures of the current growing season, and a high degree of similarity in tree growth at different sites in the southwest Yukon suggests a regional response to a large-climate signal. An increase in krummholz height and improved seedling establishment in the forest-tundra ecotone could result in a shift from krummholz to symmetrical trees and/or from patch forest to continuous forest. |
format |
Thesis |
author |
Ayotte, Nicole. |
author_facet |
Ayotte, Nicole. |
author_sort |
Ayotte, Nicole. |
title |
White spruce dynamics in the forest-tundra ecotone, the southwest Yukon Territory. |
title_short |
White spruce dynamics in the forest-tundra ecotone, the southwest Yukon Territory. |
title_full |
White spruce dynamics in the forest-tundra ecotone, the southwest Yukon Territory. |
title_fullStr |
White spruce dynamics in the forest-tundra ecotone, the southwest Yukon Territory. |
title_full_unstemmed |
White spruce dynamics in the forest-tundra ecotone, the southwest Yukon Territory. |
title_sort |
white spruce dynamics in the forest-tundra ecotone, the southwest yukon territory. |
publisher |
Université d'Ottawa / University of Ottawa |
publishDate |
2002 |
url |
https://dx.doi.org/10.20381/ruor-14712 http://www.ruor.uottawa.ca/handle/10393/6152 |
geographic |
Yukon |
geographic_facet |
Yukon |
genre |
Tundra Yukon |
genre_facet |
Tundra Yukon |
op_doi |
https://doi.org/10.20381/ruor-14712 |
_version_ |
1766228480172752896 |