Structure and diversity of trees on post-fire regenerated areas in Sierra de Guerrero, Mexico

Abstract

Background: It is known that forest ecosystems have the capacity to regenerate over time. However, the anthropogenic influence over them arises the question on how different the original ecological conditions are after regeneration.
 Question: Do fires and agrochemicals have an influence on tree diversity in the study area?
 Studied species/ Data description/ Mathematical model: The structure and diversity data obtained from tree communities on four different areas were evaluated. The evaluated areas were a control area (mature forest without management) and three areas with different managements: reforested area, restored area and fumigated area.
 Study site and years of study: The study area was located in the Sierra de Guerrero, Mexico on areas affected by a fire that occurred in 2005. Seven years after the fire, in 2012, the investigation was performed.
 Methods: In each selected area a census of all tree species was carried out. The density, dominance, frequency, and importance value index were determined per species. Moreover, the diversity at community level and richness were estimated.
 Results: The control area showed highest values of density and dominance. The regenerated and reforested area showed highest values of specific richness and diversity.
 Conclusions: The evaluated areas showed significant differences when comparing diversity and structure indexes. It is recommended to implement reforestation actions in areas affected by forest fires.