ANÁLISE DA ESTRUTURA VEGETACIONAL EM UMA ÁREA DE CAATINGA NO MUNICÍPIO DE BOM JESUS, PIAUÍ

Abstract

The vegetation of the Caatinga has different types of unique landscapes, in which little is known. Considering the situation, this study aimed to perform a phytosociological survey in area of Ca atinga, located in Bom Jesus, Piauí. Were systematically re leased 15 quadratic plots with 400 m², with spacing of 80 m between plots and between lines. Within each sampli ng unit were measured all individuals with circumfe rence at breast height (CBH) ≥ 6 cm, as measured in these individuals the CBH and the total height. With this, it were calculated the phytosociological parameters, diamet er distribution and diversity index of Shannon-Wean er (H'). In this survey we sampled 640 individuals represent ing 36 species, which provided a density of 1600 in d ha -1 and an estimated basal area of 17.02 m² ha -1 . The species most representatives were Copaifera langsdorffi Desf., Ptyrocarpa moniliformis Benth., Pterodon abruptus (Moric.) Benth and Combretum glaucocarpum (Mart.) Eichl. , with about 43% of the sampled and 40% in the area of ecological importance. The result of the diversity index of Shannon-Weaner was 2.96 nats in d -1 .