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A variacao da composicao floristica e estrutural da regeneracao natural (0,10 < altura < 3,0 m; CAP ≤ 15 cm) foi avaliada em areas perturbadas de fragmento florestal secundario em estagio medio e pastagem, em ambiente Estacional Semidecidual de Nova Iguacu (RJ). O levantamento floristico foi realizado durante periodo chuvoso (145 mm) e de estiagem (15 mm) no ano 2008, utilizando-se metodo fitossociologico de pontos. Os resultados evidenciaram a saida de 8 especies (37,50% de trepadeiras e 37,50% de arbustivas deciduas) na floresta e 7 especies (71,43% de herbaceas) na pastagem. A diversidade e o tipo de habito das especies regenerantes na floresta sinalizam a adaptacao das especies permanentes ao sistema ecologico com marcado periodo de estiagem, em que os efeitos climaticos afetam rapidamente as dinâmicas populacionais dos ecossistemas em fase de restauracao. Palavras-chave: Sazonalidade; sucessao vegetal; restauracao florestal. Abstract Evaluation of regeneration in disturbed ecosystems as indicator of restoration in environments with marked seasonality, Nova Iguacu (RJ) . The variation of the floristic and structural composition of the natural regeneration (0.10 <height <3.0 m; CAP ≤ 15 cm) were evaluated in disturbed area of middle stage secondary forest fragment  and pasture, in Semideciduous Seasonal Environment of Nova Iguacu (RJ). The floristic survey was done during rain period (145 mm) as well as drought (15 mm) along the year 2008. It was used phytosociology point method. The results evidenced emergency of 8 species (creepers 37.50% and shrub 37.50%) in forest, and 7 species (71.43% herbaceous) in pasture. Diversity and kind of habit of species in regeneration in the forest point to adaptation of permanent species to the ecological system with marked drought period, as the climatic effects quickly affect population dynamics of the ecosystems in restoration phase. Keywords: Seasonality; vegetable succession; forest restoration.

AVALIAÇÃO DA REGENERAÇÃO EM ECOSSISTEMAS PERTURBADOS COMO INDICADOR DA RESTAURAÇÃO EM AMBIENTES COM MARCADA ESTACIONALIDADE, NOVA IGUAÇU (RJ)