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Trends in tree biomass along topgraphically- and climatically-induced permafrost gradients in the Mackenzie Valley, NWT

Ruth Errington, Jagtar Bhatti, Thierry Varem-Sanders

In the proceedings of: GEO2010 Calgary: 63rd Canadian Geotechnical Conference & 6th Canadian Permafrost Conference

Session: M3-D

ABSTRACT: With permafrost distribution controlled largely by topography and climate, this study examines the influence of climate and permafrost conditions on standing tree biomass along a climatic gradient extending from the Mid-Boreal Ecoclimatic Region in the southern Northwest Territories to the High Subarctic environments near the arctic tree line at Inuvik. At each of 25 sites, plots were established in areas of permafrost-affected peatlands (peat plateaux), areas of permafrost thaw (collapse scars), and adjacent forest environments occurring on mineral soils (upland forests). Significant (=0.05) changes in tree biomass were observed along both the climatic and topographic gradients examined with results demonstrating the complexities of permafrost environments.

RÉSUMÉ: La répartition du pergélisol dépend principalement de la topographie et du climat. Dans le cadre de la présente étude, on a examiné l'effet du climat et de l'état du pergélisol sur la biomasse d'arbres sur pied qui se situe le long d'un gradient climatique s'étendant de la région écoclimatique des terres boréales moyennes, dans les Territoires du Nord-Ouest, jusqu'à la région du haut-subarctique, près de la limite septentrionale des arbres d'Inuvik. À chacun des 25 sites de l'étude, on a établi des placettes dans des tourbières pergélisolées (plateaux de tourbières), des zones de dégel du pergélisol (tourbières oligotrophes effondrées) et des zones forestières adjacentes situées sur des sols minéraux (forêts des hautes terres). Des changements significatifs ( = 0,05) ont été observés dans la biomasse d'arbres le long des gradients climatiques et topographiques qui ont été examinés. Les résultats de l'étude illustrent la complexité des milieux pergélisolés.

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Cite this article:
Ruth Errington; Jagtar Bhatti; Thierry Varem-Sanders (2010) Trends in tree biomass along topgraphically- and climatically-induced permafrost gradients in the Mackenzie Valley, NWT in GEO2010. Ottawa, Ontario: Canadian Geotechnical Society.

@article{GEO2010_165, author = Ruth Errington; Jagtar Bhatti; Thierry Varem-Sanders,
title = Trends in tree biomass along topgraphically- and climatically-induced permafrost gradients in the Mackenzie Valley, NWT,
year = 2010
}