Abstract
All forest ecosystems are subject to canopy disturbance events that influence species composition and stand structure, and drive patterns of succession and stand development. Disturbances may be categorized by a variety of characteristics, but they are most often classified along a gradient according to their spatial extent, magnitude, and frequency. This gradient spans from broad-scale, stand-replacing events where most of the overstory is removed to fine-scale events which result from the removal of a single canopy individual or a small cluster of trees. The disturbance regimes of most stands in the Central Hardwood Region are characterized by fine-scale events. At the stand scale, these localized and asynchronous events can create a patchwork mosaic of microsites comprised of different tree species, ages, diameters, heights, crown spreads, and growth rates. Through the modification of fine-scale biophysical conditions, these localized canopy disturbances promote heterogeneity and biodiversity in forest ecosystems. Forest management based on natural disturbance processes should consider elements of the gap-scale disturbance regime, such as frequency, size, shape, and closure mechanisms, and the historical range of variation associated with these characteristics. Silvicultural prescriptions are available for gap-based management designed to promote oak regeneration and mimic natural disturbance processes.
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Acknowledgments
I would like to thank Merrit Cowden, Lauren Cox, Tom Weber, James Rentch, Beverly Collins, and Cathryn Greenberg for their many helpful comments on earlier drafts.
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Hart, J.L. (2016). Gap-Scale Disturbances in Central Hardwood Forests with Implications for Management. In: Greenberg, C., Collins, B. (eds) Natural Disturbances and Historic Range of Variation. Managing Forest Ecosystems, vol 32. Springer, Cham. https://doi.org/10.1007/978-3-319-21527-3_2
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