Growth and reproductive post-fire responses of two shrubs in semiarid Patagonian grasslands
S. L. Gonzalez A C , L. Ghermandi A and D. V. Peláez B
+ 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 Centro de Recursos Naturales Renovables de la Zona Semiárida, Universidad Nacional del Sur, Comisión de Investigaciones Científicas de la Provincia de Buenos Aires, Camino a la Carrindanga km 7 (8000), Bahía Blanca, Argentina.
C Corresponding author. Email: sofia903@gmail.com
International Journal of Wildland Fire 24(6) 809-818 https://doi.org/10.1071/WF14134
Submitted: 29 July 2014 Accepted: 20 March 2015 Published: 14 May 2015
Abstract
Variation in fire intensity affects the post-fire survival and growth of shrubs. We examined effects of maximum fire temperature (a proxy for fire intensity) on the survival, growth and reproductive performance of the shrubs Mulinum spinosum and Senecio bracteolatus at 1 and 2 years post-fire in north-west Patagonian grasslands. We applied two fire temperature treatments to plants of each species. All M. spinosum plants survived fire treatments but high fire temperature notably decreased survival of S. bracteolatus. Bud position and plant architecture probably influenced shrub survival. During the first growing season, M. spinosum did not produce seeds whereas S. bracteolatus plants burned at low temperature produced three times more seeds and bigger seeds than unburned plants. Also, seeds from burned plants of S. bracteolatus had higher germinability than seed from unburned plants. High survival and resprouting capacity of M. spinosum even after high fire intensity indicate that this species might be less affected by changes in fire regime.
Additional keywords: fire intensity, grassland, Patagonia, seed production, shrubs.
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