Descritores fitossociológicos estruturais e ecounidades do mosaico silvigênico da floresta ombrófila densa no município de Presidente Figueiredo/Balbina-AM

Abstract

There were evaluated the phytosociological structure and the eco units of the Silvigenic mosaic of a Dense Ombrophilous Forest (plateau), located in the municipality of President Figueiredo at km 19 of Morena (brunette)-road Balbina-AM, for the phytosociological study . it used the method of multiple plots in which were considered all individual trees with DAP equal or upper to 10 cm in 5 rectangular plots 50 m x 100 m. In vegetal community of the plateau, it registered 167 tree species, 88 types and 39 families. According to the values of density, frequency and dominance, it was observed that the specie Eschweilera Coriaceae was what took a higher value of importance in this community, followed by the species Pouteria rostrata, eschweilera truncata, Protium apiculatum and Protium hebetatum. In the vertical structure has been found that the stratum medium is concentrated the largest number of individuals (68,13%) with heights between 12m-19,3 m, in the lower stratum (18,13%) small heights to 12m and the upper stratum (13,5%) trees with heights larger than 19,3 m. The Diametric distribution of the individuals was represented by a “ J” inverted, in the first class (10,2 cm – 18,0 cm) occurred 49,1% of the total of sampled trees. The result of the Shannon index allowed to conclude that in the forest there is a high heterogeneity of species, with a value of 3,9 and an equability of 0,78. In relation to the Jaccard index it found a value higher of the 30% among the plots, indicating that exist similarity between the plots. In the determining of the spatial pattern was observed that most of the species (74,25%) shown a distribution of uniform type. The analysis of the mosaic silvigenic mosaic was performed using the method of inventory of intercepted lines, worked in the same plots, it was found that the percentages of area occupied by the developing eco units were 42,4%, 46,8%, 54,6 %, 49,7% and 50,3% respectively in the 5 areas studied, for the eco units in degradation, 8,2%, 5,7%, 5,5%, 6,8% and 3.2% and for the eco units in equilibrium, 42,3%, 47,5%, 40%, 43,6% and 50,3% respectively. Concluding that the eco units in developing and equilibrium it found equally distributed.