ESTRUTURA DA VEGETAÇÃO EM REMANESCENTES DE CAATINGA COM DIFERENTES HISTÓRICOS DE PERTURBAÇÃO EM CAJAZEIRINHAS (PB)

Abstract

The Caatinga is one of the least known biomes in terms of structure and floristic composition, worrying aspect because it undergoes an intense process of human disturbance. With this assumption, we car- ried out a phytosociological survey of adult vegetation and natural regeneration in areas with different histories of disturbance. For a sampling of the shrub/adult tree and natural regeneration, settled in a systematic, 18 sam- pling units in each area (Habitat I and Habitat II), with dimensions of 10 x 25 m and 10 x 5 m respectively. Individuals were surveyed adults with CAP ≥ 6.0 cm, and natural regeneration measured the individuals taller than 0.5 m and CNB <6.0 cm. Habitat II in the were sampled 1155 individuals belonging to 6 families and 12 species, and the habitat I was sampled 286 individuals belonging to three families and six species. The diversity index was 1.5 and 0.23 for Nats.individual - 1 Habitat II and habitat I respectively. We sampled 636 individuals in natural regeneration, being habitat I in 360 and 276 in the Habitat II. The diversity index of natural regenera- tion for the Habitat II and habitat I were 1.21 and 0.8 Nats.individual - 1 . It was concluded that human activities were able to change the vegetation structure and species diversity in both habitats significantly.