Recovery of forest structure and composition to harvesting in different strata of mixed even-aged central Appalachian hardwoods |
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| Authors: | Eric K Zenner Yvette L Dickinson JeriLynn E Peck |
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| Institution: | 2. School of Forest Resources, The Pennsylvania State University, 305 Forest Resources Building, University Park, PA, 16802, USA
1. School of Forest Resources, The Pennsylvania State University, 117 Forest Resources Building, University Park, PA, 16802, USA
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| Abstract: | Context Implementing nature-based silviculture requires understanding the structural and compositional changes that occur in forested stands under known disturbance types and intensities. Aims The objectives were to assess the (a) resistance of hardwood forests to change, (b) their trajectory of recovery following disturbance, and (c) how closely resulting forests resemble original forests. Methods We characterized tree structure and composition at three points in time (pre-disturbance, 1-year post-disturbance, and ～15 years following disturbance) along a harvesting disturbance gradient created by removing trees in different forest canopy strata. Results Significant differences to pre-disturbance conditions were noted immediately post-harvest for tree basal area, density, species richness, and tree species composition; treatment differences were observed for all parameters except diversity. Plots exposed to the least extreme harvesting disturbances (cutting small and intermediate trees) had returned to pre-disturbance conditions for most parameters after 15 years, while the most extreme harvesting disturbance (cutting large trees) had not yet recovered. Conclusions Although not initially resistant, Central Appalachian eastern hardwoods are fairly resilient to the removal of trees in the subcanopy or a mixture of the subcanopy and canopy; only the removal of solely canopy trees (i.e., high grading) and complete removal (i.e., clearcutting) appear to impose harvesting disturbances to which these forests may not be resilient. |
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