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This research was carried out to study the floristic composition and phytosociology of tree species in the phenological site of Embrapa Western Amazonia, Suframa Agropecuary District-SAD, Manaus-AM, aiming to help future selection of seed trees, for the establishment of seed collecting areas. Twenty plots of 10m x 50m were studied, along a topographic sequence, where trees with a diameter at breast height (dbh) ≥ 20,0cm were inventoried. A total of 240 trees belonging to 29 families, in 70 genera with 100 species were identified. The most important families, in a decreasing order, were: Lecythidaceae, Sapotaceae, Mimosaceae, Caesalpiniaceae, Chrysobalanaceae, Fabaceae, Humiriaceae, Moraceae, Vochysiaceae and Apocynaceae. These families constituted 67% of the local species richness and 75,8% of the number of individuals, suggesting that diversity is concentrated in a few families. Lecythidaceae had the largest dbh and number of individuals, and Sapotaceae the greatest richness species in the area. The most important species (IVIs) were Eschweilera coriacea (DC.) S.A. Mori; Qualea paraensis Ducke; Vantanea macrocarpa Ducke; Eschweilera atropetiolata S.A. Mori; Couratari stellata A.C. Sm.; Lecythis usidata Miers.; Eperua duckeana R.S. Cowan; Eschweilera amazonica R. Knuth and Chrysophyllum manaosense (Aubr.) T.D. Penn. The Shannon diversity and Sorensen similarity indexes indicated a low diversity and a high dissimilarity floristic among plots in this study for the minimum dbh considered. The diameter of the first class measuring 20cm - 30cm presented the most number of individuals, contributing 45% of samples. Above the center class of 55cm of dbh, around 90% of species have been represented by only one

Composição florística e fitossociologia de espécies arbóreas do Parque Fenológico da Embrapa Amazônia Ocidental