VEGETATION COVER AND REGENERATION AS PREDICTORS OF DESERTIFICATION
PROCESS IN DRY FOREST IN BRAZIL
Abstract
The Brazilian Caatinga is one of the most diverse dry forests on the
planet. Half of its original coverage is degraded, and it is currently
identified as one of the main areas undergoing desertification. Natural
regeneration depends on climatic and edaphic conditions, as well as the
adult stratum present in an area. Despite its importance, this process
is little known in the Caatinga. Thus, we aimed to analyze how the
anthropic disturbance, vegetation cover, and soil properties influence
regenerating stratum under different Caatinga vegetation cover levels.
Our study was executed in the driest region of Brazil. We classified our
studied areas as Area I (less vegetation cover) and Area II (greater
coverage). Six plots of 50 x 20 m were delimited for sampling the adult
and regenerating stratum, and the soil in each area. Our results show
interactions between soil characteristics and adult and regenerating
stratum. Area II showed greater diversity and a greater number of
exclusive species; in contrast, a dominance of species more resistant to
limiting conditions was observed in Area I, such as Aspidosperma
pyrifolium Mart. & Zucc. The C and N contents in the soil indicated a
positive and significant correlation with the diversity of the
regenerating stratum. The data revealed that the area with less
vegetation cover, richness, and diversity presented indications of
desertification.