Resumo

FLORES RODRIGUEZ, Ana Graciela et al. Pine and oak natural regeneration under different levels of forest fire disturbance. Rev. mex. de cienc. forestales [online]. 2021, vol.12, n.65, pp.3-25.  Epub 30-Ago-2021. ISSN 2007-1132.  https://doi.org/10.29298/rmcf.v12i65.776.

The behavior of forest fires varies due to various factors, where the level of severity conditions the response that ecosystems will have to fire, such as the ability of natural regeneration. Not much has been studied in this regard in Mexico, which has limited restoration strategies. Therefore, a comparative analysis of the natural regeneration of trees in three height ranges (0 -0.30 m, 0.31-1.0 m and 1.1-3.0 m) was made, considering an experimental design with two factors: 1) different conditions of severity of the fire (without fire, moderate fire, extreme fire); and 2) three regions of pine-oak forests (Sierra de Quila, Bosque La Primavera and Sierra de Tapalpa). For the comparative analysis ANOVA and Tukey test were generated, based upon an experimental factorial design (region and severity). Results suggest that there is a significant difference between the conditions of severity of the fires and between the regions, for the height range of 0 to 0.30 m, with a greater regeneration in areas with moderate fires. This is highlighted, in Tapalpa where an average 160 000 ha-1 individuals are estimated. In regard to the other regeneration strata (0.31 -1.0 m and 1.1-3.0 m) no significant differences were found between the severities of fire conditions, only on the regeneration of pine. It is concluded that the occurrence of a moderate fire can lead to a higher incidence of natural regeneration.

Palavras-chave : fire; intermediate disturbance; fire regime; resilience; vegetation response; severity of forest fires.

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