Abstract

This article reports the floristic and phytosociology of a solid ground forest, located in the Environmental Park Antonio Danubio Lourenço da Silva, municipality of Ananindeua, Pará, Brazil. The inventory of 1 ha considered individuals with diameter at breast height (DBH) ≥ 10 cm, allocated twenty plots in each field, all of size 20 m x 25 m (500 m²) arranged randomly. A total of 239 plants was registered, distributed in 61 species, 51 genera and 27 families, referring to biocenose area. The families with most species, in a decreasing order, were: Leguminosae, Lecythidaceae, Sapotaceae, Urticaceae, Anacardiaceae, Annonaceae, Caryocaraceae, Vochysiaceae, Lauraceae, Arecaceae and Malvaceae. In relation to the importance value index (IVI_i), the highest values ​​were presented by the species: Oenocarpus bacaba, Nectandra cuspidata, Theobroma grandiflorum, Diplotropis purpurea, Piptadenia suavelons, Inga lauriana, Cecropia obtusifolia, Cecropia sciadophylla, Tapirira guianensis and Jacaranda copaia. These species represent 56.06% of the individuals sampled per hectare and 58.63% of the IVI_i. The diversity index of Shannon-Weaver (H '= 3.53) indicates that the park has a floristic diversity less than other native forest fragments in State of Para, Brazil. This is probably due to the park being part of an anthropic area near the federal highway BR-316, where a large number of vehicles circulate daily.

Key words: Phytosociology, biodiversity, conservation, identificacion.