A fitossociological survey was carried out in a terra firme dense tropical rainforest on a stretch of Estrada da Várzea (Foodplain road) linking Manaus to the counties of Silves and Itapiranga in Amazonas state. The work was aimed at analysing floristic composition fitossociological parameters necessary for determining species ecological importance value index (IVI), as well as, the vegetation structure. Sample distribution was carried out through sattelite image analysis. Sampling was done in a 10 x 1.000m transect, divided into 20 subplots, each measuring 10 x 50m. All arboreal individuals with a circumference at breast height (CBH) ≥ 30cm, such as, palm trees, vines and terrestrial herbs were included from which samples were taken for later identification; according to the Cronquist system. As a result, 527 individuals distributed into 47 families, 118 genera and 196 species, were recorded. Families presenting the highest diversity were Lecythidaceae (20), Lauraceae (19), Sapotaceae (17), Chrysobalanaceae, Burscraceae (12) and Annonaceae (9), representing 47% of the family diversity, showing local diversity to be concentrated within few families. Species with highest importance value index (IVI), Goupia glabra Aubl. (9.34), Ocotea rubra(Meiss.) Allen (8.71), because of their large diameter represented in the relative dominance. Nevertheless, when comparing local density with the one obtained from other works using the same sampling criteria it was concluded that the locality is less abundant in number of individuals per ha., but the diversity of families and species docs not differ from results reached for terra-firme forests within other areas in Amazonia.
Amazon; Fitossociology; Tropical Rainforest; Terra Firme