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Ecosystems

, Volume 13, Issue 6, pp 932–947 | Cite as

The Origin and Dynamics of Subalpine White Spruce and Balsam Fir Stands in Boreal Eastern North America

  • Guillaume de LafontaineEmail author
  • Serge Payette
Article

Abstract

Associations among the few tree species in the North American boreal landscape are the result of complex interactions between climate, biota, and historical disturbances during the Holocene. The closed-crown boreal forest of eastern North America is subdivided into two ecological regions having distinct tree species associations; the balsam fir zone and the black spruce zone, south and north of 49°N, respectively. Subalpine old-growth stands dominated by trees species typical of the balsam fir forest flora (either balsam fir or white spruce) are found on high plateaus, some of which are isolated within the black spruce zone. Here we identified the ecological processes responsible for the distinct forest associations in the subalpine belt across the eastern boreal landscape. Extensive radiocarbon dating, species composition, and size structure analyses indicated contrasted origin and dynamics of the subalpine forests between the two ecological regions. In the black spruce zone, the subalpine belt is a mosaic of post-fire white spruce or balsam fir stands coexisting at similar elevation on the high plateaus. With increasing time without wildfire, the subalpine forests become structurally similar to the balsam fir forest of the fir zone. These results concur with the hypothesis that the subalpine forests of this area are protected remnants of an historical northern expansion of the fir zone. Its replacement by the fire-prone black spruce forest flora was caused by recurrent fires. In the subalpine belt of the fir zone, no fire was recorded for several millennia. Harsh climate at high altitude is the primary factor explaining white spruce dominance over balsam fir forming a distinct subalpine white spruce belt above the balsam fir dominated forest.

Keywords

14C AMS dating Abies balsamea boreal forest charcoal analysis eastern North America fire disturbance Picea glauca size structure analysis subalpine forest 

Notes

Acknowledgments

We wish to thank Catherine Plasse, Joannie Savard, and William H. Romme and many others who helped us with field work as well as two anonymous reviewers for helpful comments. This work was supported by a NSERC research grant to S.P. and Alexander Graham Bell Canada Graduate Scholarship to G.dL.

Supplementary material

10021_2010_9366_MOESM1_ESM.doc (259 kb)
Supplementary material 1 (DOC 259 kb)

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Copyright information

© Springer Science+Business Media, LLC 2010

Authors and Affiliations

  1. 1.NSERC Northern Research Chair, Centre d’Études Nordiques, Département de BiologieUniversité LavalQuébecCanada

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