Levantamento fitossociológico em área de Caatinga no monumento natural Grota do Angico, Sergipe, Brasil

Abstract

The Caatinga is a vegetation that occurs exclusively in Brazil, typically in the Northeastern region and studies on the floristic composition and phytosociological are prerequisites for understanding the behavior, distribution and structure of the vegetation. Therefore, this study aimed to conduct a phytosociological survey of an area approximately 191 hectares of Caatinga, located within of the Unity Conservation area Grota do Angico Natural Monument, Sergipe state, Brazil. To conduct this study, we used the method of fixed area and the process of systematic sampling, where all individuals included in the 30 plots that showed CAP (circumference at breast height) greater than 6 cm were measured. In total of the survey, we identified 24 species in 20 genres and 12 families. The families with the higher number of species were Fabaceae, Euphorbiaceae e Anacardicaceae. Poincianella pyramidalis (Tul.) L. P. Queiroz, Jatropha mollissima (Pohl.) Baill., Bauhinia cheilantha, Anadenanthera colubrina (Vell.) Brenan. and Mimosa tenuiflora were the most representative species for the phytosociological indices (density, cover, frequency and important value index). The basal area at the study site was 6,95 m2 ha-1 and the volume 28,42 m3 ha-1.