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Ecosystems

, Volume 17, Issue 6, pp 1053–1067 | Cite as

Do Boreal Forests Need Fire Disturbance to Maintain Productivity?

  • Charles WardEmail author
  • David Pothier
  • David Paré
Article

Abstract

Fire is considered as a major driver of ecosystem processes of the boreal forest with important effects on soil and forest productivity. When the interval between successive forest fires is long, a thick organic layer can develop and eventually interfere with processes involved in tree nutrient uptake. We thus hypothesized that the organic layer of well-drained boreal stands increases with time since last fire and that thick organic layers are associated with low values of soil temperature, nutrient availability, and site productivity. This was tested on a chronosequence composed of 90 boreal stands ranging from 1 to more than 2000 years after fire within which we measured organic layer thickness (OLT), mineral soil and foliage nutrient concentrations, soil temperature, ground cover of Sphagnum sp. and Ericaceae sp., leaf area index, aboveground biomass production, and growth efficiency index (GEI). The OLT increased during the first 64 years after fire but stayed statistically constant thereafter. This initial increase in OLT was accompanied by an increase in the C/N ratio and decreases in soil temperature, foliar N, and GEI. The absence of a significant decrease in productivity from 80 to 2000 years post-fire suggests that these characteristics reach a steady state early in the chronosequence that persists in the absence of major disturbances or changes in site conditions. These results imply that management practices may not be necessary to maintain boreal forest productivity in the absence of fire on well-drained sites.

Keywords

boreal forest post-fire chronosequence site productivity leaf area index organic layer thickness soil temperature soil nutrient concentrations 

Notes

Acknowledgments

We thank the Fonds de Recherche du Québec - Nature et Technologies (FRQNT) and the NSERC-Université Laval Industrial Research Chair in Silviculture and Wildlife for providing financial support for this project. We are also grateful to the people who were involved in the field work and the laboratory work: Louis-Vincent Gagné, Sylvain Pelletier-Bergeron, Camille Bastien, Vanessa Joly, Thomas Bourbonne, and Justine Bertoux. Our gratitude also goes to Jerôme Laganière and David Auty for helpful comments on the manuscript, to Serge Payette, Pierre-Luc Couillard, and Elisabeth Robert for advice on radiocarbon dating, and to Pamela Cheers for editing.

Supplementary material

10021_2014_9782_MOESM1_ESM.docx (22 kb)
Supplementary material 1 (DOCX 21 kb)

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Copyright information

© Springer Science+Business Media New York 2014

Authors and Affiliations

  1. 1.Centre d’étude de la forêt, Département des sciences du bois et de la forêtUniversité LavalQuebecCanada
  2. 2.Ressources naturelles Canada, Service canadien des forêts, Centre de foresterie des LaurentidesQuebecCanada

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