Estrutura diamétrica de um remanescente de Cerrado sensu stricto da Amazônia legal

Abstract

The diametric structure of a fragments of cerrado sensu stricto, will provide relevant information on plant typology, successional stages, forest conservation states, ecological groups of species, management regimes, growth dynamics, forest uses, among others, meanwhile. , the information currently available is still insufficient to understand the dynamics of these phytophysiognomies when compared to other vegetation cover. The objective of this study was to carry out a floristic and phytosiological survey and to define the diametric structure of a remnant of cerrado sensu stricto located in the municipality of Cariri do Tocantins. Five permanent plots with dimensions of 50 x 20 m (1000 m2) each were installed, totaling 0.5 ha, being ten meters distant from the edge and between them. All shrub-tree species with diameter ≥ 10 cm, measured at 1.30 m of the soil, were sampled, all living and dead individuals standing. The absolute and relative values of density, frequency, dominance and value of Importance (VI), Shannon diversity index (H ') and Pielou equability (J') were analyzed. The floristic and phytosociological survey registered a total of 1033 shrub-arboreal individuals, distributed in 94 species, referring to 57 botanical families. The dead individuals standing up added 5.51%, whereas the Fabaceae family registered the largest number of species and the Vochysiaceae family had the largest number of individuals, and the two families had the highest values of importance. Callisthene major was the species with the highest number of individuals and importance index. The average height of the vegetation sampled was 5.5 m and the mean diameter found was 9.5 cm, in addition to a basal area of 10.5 m². The diversity index of Shannon (H ') was 3.54 and Pielou equability (J') was 0.781.