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Edge fires drive the shape and stability of tropical forests

Author(s): Hébert-Dufresne, Laurent; Pellegrini, Adam F.A.; Bhat, Uttam; Redner, Sidney; Pacala, Stephen W.; et al

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Abstract: In tropical regions, fires propagate readily in grasslands but typically consume only edges of forest patches. Thus, forest patches grow due to tree propagation and shrink by fires in surrounding grasslands. The interplay between these competing edge effects is unknown, but critical in determining the shape and stability of individual forest patches, as well the landscape-level spatial distribution and stability of forests. We analyze high-resolution remote-sensing data from protected Brazilian Cerrado areas and find that forest shapes obey a robust perimeter–area scaling relation across climatic zones. We explain this scaling by introducing a heterogeneous fire propagation model of tropical forest-grassland ecotones. Deviations from this perimeter–area relation determine the stability of individual forest patches. At a larger scale, our model predicts that the relative rates of tree growth due to propagative expansion and long-distance seed dispersal determine whether collapse of regional-scale tree cover is continuous or discontinuous as fire frequency changes.
Publication Date: Jun-2018
Electronic Publication Date: 25-Mar-2018
Citation: Hébert-Dufresne, Laurent, Pellegrini, Adam FA, Bhat, Uttam, Redner, Sidney, Pacala, Stephen W, Berdahl, Andrew M. (2018). Edge fires drive the shape and stability of tropical forests. Ecology Letters, 21 (6), 794 - 803. doi:10.1111/ele.12942
DOI: doi:10.1111/ele.12942
ISSN: 1461-023X
Pages: 794 - 803
Type of Material: Journal Article
Journal/Proceeding Title: Ecology Letters
Version: Final published version. This is an open access article.

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