Growth and reproductive post-fire responses of two shrubs in semi-arid Patagonian grasslands
GONZALEZ S.; GHERMANDI L.; PELAEZ D.
INTERNATIONAL JOURNAL OF WILDLAND FIRE
Lugar: Collingwood; Año: 2015 vol. 24 p. 809 - 818
Abstract. Variation in fire intensity affects the post-fire survival and growth of shrubs. We examined effects ofmaximum fire temperature (a proxy for fire intensity) on the survival, growth and reproductive performance of the shrubsMulinum spinosum and Senecio bracteolatus at 1 and 2 years post-fire in north-west Patagonian grasslands. We appliedtwo fire temperature treatments to plants of each species. All M. spinosum plants survived fire treatments but high firetemperature notably decreased survival of S. bracteolatus. Bud position and plant architecture probably influenced shrubsurvival. During the first growing season, M. spinosum did not produce seeds whereas S. bracteolatus plants burned atlow temperature produced three times more seeds and bigger seeds than unburned plants. Also, seeds from burned plantsof S. bracteolatus had higher germinability than seed from unburned plants. High survival and resprouting capacityof M. spinosum even after high fire intensity indicate that this species might be less affected by changes in fireregime.