Floristic composition and phytosociological structure of a fragment of Dense Ombrophilous Forest in the municipality of Macaíba, RN=Composição florística e estrutura fitossociológica de um fragmento de Floresta Ombrófila Densa no município de Macaíba, RN
2016
Luan Henrique Barbosa de Araújo | Richeliel Albert Rodrigues Silva | Kyvia Pontes Teixeira das Chagas | Camila Costa da Nóbrega | José Augusto da Silva Santana
Phytosociological studies in forest remnants are extremely important when characterising the horizontal structure of forest communities, as the data generated serves both as the basis for forest management projects and for restoring biodiversity. The aim therefore, was to analyse the phytosociology of the vegetation, and characterise the horizontal structure, of a fragment of Dense Ombrophilous Forest in the municipality of Macaíba in the State of Rio Grande do Norte (RN), Brazil. To collect data on the arboreal component, the pointquarter method was used, allocating five transects spaced 15 m apart, giving a total of 175 quarter points along the tracks, with a distance of 8 m between points. The sample included all individuals with a diameter at breast height (DBH) ≥10 cm and a minimum height of 1.0 m. The estimated density of the fragment was 1,873 individuals ha-1, with a basal area of 22.11 m² ha-1, Shannon diversity index of 3.19 nats/ind and Pielou evenness index of 0.79. The greatest proportion of individuals was distributed across the ranges of 3.18 to 8.19 cm in diameter and 3.79 to 5.79 m in height. Based on the analysed data from the floristic survey, the study area is characterised as Dense Ombrophilous Forest at an intermediate medium stage of regeneration, with Copaifera cearenses as the species having the highest importance value in the fragment.
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