CONSERVA\uc7\uc3O DAS FLORESTAS DO PROJETO DE ASSENTAMENTO BENFICA, SUDESTE DA AMAZ 4NIA

In this study we analyze the floristic and structure of forest remnants in Benfica Settlement Project located in the municipality of Itupiranga, in southeastern Amazon. Eleven areas of forests located in different properties and different levels of disturbance were selected. Within each area, plants in one plot of 500 m2, were surveyed considering three strata: upper, middle and inferior. The species were classified in five life forms: tree, scrub, liana, palm and herb; and two functional groups, the pioneer and forest species. Two houndred and eighty-six (286) species, 173 genera and 68 families were found. Most woody species (51 %) occurred in only one stratum. The richness of species was 70 % of estimated richness by Jack-nife of first order. The percentage of rare species was high, 138 species occurred in only one area. In all strata, the trees had higher density, except in inferior stratum, where the grasses were denser. The forest species, in all strata, were dominant. There was significant difference between the forest and pioneer in all forms of life, in all strata. The principal components analysis showed heterogeneity among the studied plots, forming three groups which appear to be related to the different disturbance levels.Este trabalho teve como objetivo descrever e analisar a composi\ue7\ue3o flor\uedstica e a estrutura de remanescentes florestais do Projeto de Assentamento Benfica, no munic\uedpio de Itupiranga, Par\ue1. Foram selecionadas 11 \ue1reas de florestas localizadas em diferentes propriedades e com diferentes n\uedveis de perturba\ue7\ue3o. No interior de cada \ue1rea foi inventariada a vegeta\ue7\ue3o em um transecto de 500 m2, considerando tr\ueas estratos: superior, m\ue9dio e inferior. A vegeta\ue7\ue3o foi classificada em cinco formas de vida: \ue1rvores, arbustos, lianas, palmeiras e herb\ue1ceas; e dois grupos funcionais: pioneiras e florestais. Foram encontradas 286 esp\ue9cies, 173 g\ueaneros e 68 fam\uedlias. A maioria das esp\ue9cies lenhosas (51 %) ocorreu em apenas um estrato. A riqueza de esp\ue9cies correspondeu a 70 % da riqueza estimada por Jack-nife de primeira ordem (J1 = 418,45). A porcentagem de esp\ue9cies raras foi alta; 138 esp\ue9cies ocorreram em apenas uma \ue1rea. Em todos os estratos, as \ue1rvores apresentaram maior densidade, exceto no estrato inferior, onde as herb\ue1ceas foram mais densas, seguida das \ue1rvores. As esp\ue9cies florestais predominaram em todos os estratos. Houve diferen\ue7a significativa entre as florestais e pioneiras em todas as formas de vida, em todos os estratos. A an\ue1lise de componentes principais mostrou heterogeneidade entre os transectos estudados, formando tr\ueas grupos que parecem estar relacionados com os diferentes n\uedveis de perturba\ue7\uf5es