Large-scale synchrony of gap dynamics and the distribution of understory tree species in maple-beech forests

Gravel, Dominique; Beaudet, Marilou et Messier, Christian (2010). « Large-scale synchrony of gap dynamics and the distribution of understory tree species in maple-beech forests ». Oecologia, 162, pp. 153-161.

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Résumé

Large-scale synchronous variations in community dynamics are well documented for a vast array of organisms, but are considerably less understood for forest trees. Because of temporal variations in canopy gap dynamics, forest communities—even old-growth ones—are never at equilibrium at the stand scale. This paucity of equilibrium may also be true at the regional scale. Our objectives were to determine (1) if nonequilibrium dynamics caused by temporal variations in the formation of canopy gaps are regionally synchronized, and (2) if spatiotemporal variations in canopy gap formation aVect the relative abundance of tree species in the understory. We examined these questions by analyzing variations in the suppression and release history of Acer saccharum Marsh. and Fagus grandifolia Ehrh. from 481 growth series of understory saplings taken from 34 mature stands. We observed that (1) the proportion of stems in release as a function of time exhibited a U-shaped pattern over the last 35 years, with the lowest levels occurring during 1975–1985, and that (2) the response to this in terms of species composition was that A. saccharum became more abundant at sites that had the highest proportion of stems in release during 1975–1985. We concluded that the understory dynamics, typically thought of as a stand-scale process, may be regionally synchronized.

Type:	Article de revue scientifique
Mots-clés ou Sujets:	canopy gaps, synchrony, Northern hardwoods, sapling dynamics, growth release
Unité d'appartenance:	Centres institutionnels > Centre d'étude de la forêt (CEF) Faculté des sciences > Département des sciences biologiques
Déposé par:	Christian Messier
Date de dépôt:	18 févr. 2010 14:15
Dernière modification:	01 nov. 2014 02:12
Adresse URL :	http://archipel.uqam.ca/id/eprint/2625

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