Estrutura da vegetação em remanescentes de caatinga com diferentes históricos de perturbação na região de 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 carried out a phytosociological survey of adult vegetation and natural regeneration in areas with different histories of disturbance. For sampling of the shrub / adult tree and natural regeneration, settled in a systematic, 18 sampling units in each area (preserved and cleared), with dimensions of 10 x 25 x 5 m and 10 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. Preserved in the area were sampled 1155 individuals belonging to 6 families and 12 species, and the deforested area were sampled 286 individuals belonging to 3 families and 6 species. The diversity index was 1.5 and 0.23 for 1-nats.individual preserved area and cleared respectively. We sampled 636 individuals in natural regeneration, being deforested area in 360 and 276 in the preserved area. The diversity index of natural regeneration for the area preserved and cleared were 1.21 and 0.8 nats.individual-1. It was concluded that human actions were able to change significantly the deforested area, changing the entire dynamics existing in the ecosystem.