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Revista chilena de historia natural

Print version ISSN 0716-078X

Abstract

GARCIA, RAFAEL A et al. Fire promotes Teline monspessulana (Fabaceae) invasion by increasing its germination. Rev. chil. hist. nat. [online]. 2010, vol.83, n.3, pp.443-452. ISSN 0716-078X.  http://dx.doi.org/10.4067/S0716-078X2010000300011.

Worldwide, it has been reported that invasive species and fire can interact positively changing landscape dynamics and ecosystem cycles. This work aims to study the effect of forest fires on the seed bank of Teline monspessulana (L.) K. Koch (French Broom) and its implications for the invasión of the species in the mediterranean area of south-central Chile. For this aim, soil seedbank samples were subjected to different treatments that simúlate fire conditions through controlled burns. In addition, for seeds taken from mature plants the optimal range of temperatures at which germination occurs was determined. The results show that after a wildfire germination of T. monspessulana increases significantly. Heating of the seeds was the factor that triggers this increase in germination. Furthermore, it was determined that the seeds reach their maximum germination rate when preheated between 80 and 120 °C for 10 minutes. At 140 °C, 100 % of the seeds die. During a fire, optimal temperatures for germination are reached about 2 cm in depth within the soil or at the surface in areas where the accumulation of fuel (biomass) does not exceed 5 tons ha4. The small portion of the seed bank that manages to be stimulated is offset by the large seedbank that can exceed 8000 seeds m"2. This study shows that the fire, a common phenomenon in mediterranean areas and increasingly frequent in central Chile, would be promoting the persistence of T. monspessulana in areas with high human disturbance.

Keywords : Genista; plant invasions; positive feedback.

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