Effects of fire severity on early recovery of Patagonian steppes
Luciana Ghermandi A B , Sofía Gonzalez A , María Natalia Lescano A and Facundo Oddi A
+ Author Affiliations
- Author Affiliations
A Laboratorio Ecotono, Instituto Nacional de Investigaciones en Biodiversidad y Medioambiente, CONICET-Universidad Nacional del Comahue, Quintral 1250 (8400), Bariloche, Argentina.
B Corresponding author. Email: lghermandi@yahoo.it
International Journal of Wildland Fire 22(8) 1055-1062 https://doi.org/10.1071/WF12198
Submitted: 23 November 2012 Accepted: 6 June 2013 Published: 13 August 2013
Abstract
Fire severity influences the recovery and biodiversity of plant communities. We compared the early post-fire recovery of plant functional groups in two sites (one burnt with high severity and one with low severity) in the north-western Patagonian steppe. We sampled the post-fire soil seed banks, as well as the composition and cover of aboveground plant species, and calculated richness, diversity and the percentage of exotic species. Low fire severity increased the diversity of aboveground vegetation and seed banks, whereas high fire severity reduced the cover of all functional groups, with the exception of fugitive species. Tiller production of perennial grasses decreased due to bud bank mortality. In the seed bank, high severity fire reduced fugitive species and increased exotic species. Fugitive species need fire to recruit, and the combination of fire cues and post-fire environmental conditions can explain the high abundance of these species after fire. In Patagonia, the use of fire is not considered a management option because fires are believed to be dangerous to humans, goods and services. However, north-western Patagonia is sparsely populated and the frequent wildfires pose no danger. It is necessary to increase the knowledge of the ecological processes of Patagonian ecosystems related to fire regime and land use, to achieve a reasonable balance between sustainable use and conservation in this region.
Additional keywords: fugitive species, functional groups, seed bank, semi-arid grasslands.
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