Evaluación post-incendio de un bosque mixto de Pinus-Quercus en Zaragoza, Nuevo León

Fire has been a driver of biodiversity, succession, and vegetation dynamics by promoting a wide range of adaptive responses toparticulars fire regimes. The objective of this study was to estimate the recovery of the vegetation and determine if the fire had asignificant influence on the richness, diversity and distribution of the species, after 21 years of its impact. Forty 20 x 20 m plotswere sampled, equally distributed in areas with fire, northeast (NE) and southwest (SW) exposure, and without fire, NE and SWexposure, vegetation was evaluated, and physical variables were estimated. The Importance Value Index was determined. AnANOVA was performed to compare richness and diversity and a multivariate analysis to determine the most relevant factors in thedistribution of the species. In the burned areas, Quercus intricata was more important and Pinus cembroides in the areas withoutfire. ANOVA showed a significant difference (P≤ 0.05) in richness and diversity, and Tukey's test showed that the burned area withSO exposure presented greater richness than the rest of the evaluated areas. The most relevant factors in the distribution of thespecies were fire, altitude and exposure. The opening of the canopy generates favorable conditions for some shrubby species thatare oppressed by the trees