Title

Spatial and temporal dynamics in canopy dominance of an old-growth central Appalachian forest

Document Type

Article

Publication Date

6-2006

DOI

10.1139/X06-046

Abstract

Many old-growth deciduous forests in eastern North America exhibit dynamics that suggest succession from dominance by oaks (Quercus spp.) to dominance by maples (Acer spp.). We examined this phenomenon using 20 years of vegetation data from an old-growth central Appalachian forest. Considering the site as a whole, the importance of Quercus spp. declined and that of Acer spp. increased. In particular, Acer rubrum L. exhibited increasing importance in the overstory canopy on upper slopes, and Quercus spp. exhibited a contraction in spatial distribution, particularly in the midstory (P < 0.05). This narrowing of distribution in Quercus spp. was associated with regeneration being restricted to dry, acidic sites. We also considered successional dynamics within three previously identified ecological communities in the study area: oak, mixed mesophytic, and beech. This analysis indicated that increased A. rubrum importance was limited to the upper-slope oak community. A successional dynamic was not apparent in the mixed mesophytic community, and the beech community was characterized by increasing importance of Tsuga canadensis (L.) Carr. Our results suggest that ecological communities have distinct successional trajectories and that predictions of future dynamics must consider topographic and ecological gradients.

Comments

"This study (No. 02-09-93) was connected with a project of the Kentucky Agricultural Experiment Station and is published with the approval of the director. This is publication 18 of the Lilley Cornett Woods: Appalachian Research Station of Eastern Kentucky University, Richmond, Kentucky. © 2006 NRC Canada McEwan and Muller 1547 We thank M.A. Arthur, R.D. Paratley, S.K. Gleeson, M.A. Albrecht, A.L. Goff-Yates, and two anonymous reviewers for providing comments that greatly improved the manuscript." (p. 1547-1548)