Factors affecting plant diversity during post-fire recovery and succession of mediterranean-climate shrublands in California, USA

Keeley, J. E.; Fotheringham, C. J.; Baer-Keeley, M.

Abstract:

Plant community diversity, measured as species richness, is typically highest in the early post-fire years in California shrublands. However, this generalization is overly simplistic and the present study demonstrates that diversity is determined by a complex of temporal and spatial effects. Ninety sites distributed across southern California were studied for 5 years after a series of fires. Characteristics of the disturbance event, in this case fire severity, can alter post-fire diversity, both decreasing and increasing diversity, depending on life form. Spatial variability in resource availability is an important factor explaining patterns of diversity, and there is a complex interaction between landscape features and life form. Temporal variability in resource availability affects diversity, and the diversity peak in the immediate post-fire year (or two) appears to be driven by factors different from subsequent diversity peaks. Early post-fire diversity is influenced by life-history specialization, illustrated by species that spend the bulk of their life cycle as a dormant seed bank, which is then triggered to germinate by fire. Resource fluctuations, precipitation in particular, may be associated with subsequent post-fire diversity peaks. These later peaks in diversity comprise a flora that is compositionally different from the immediate post-fire flora, and their presence may be due to mass effects from population expansion of local populations in adjacent burned areas. ?? 2005 Blackwell Publishing Ltd.

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Article

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70027650

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Keeley, J. E.; Fotheringham, C. J.; Baer-Keeley, M.

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537

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English

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Diversity and Distributions

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Factors affecting plant diversity during post-fire recovery and succession of mediterranean-climate shrublands in California, USA; 2005; Article; Journal; Diversity and Distributions; Keeley, J. E.; Fotheringham, C. J.; Baer-Keeley, M.