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This article aims to characterize horizontal and diameter structure of a managed forest using graphic expression techniques. Data for this research is result of complete forest inventory (census) carried out from a block of 800 hectares, before and after selective cutting, inside Tapajos National Forest, located in the Municipality of Belterra, State of Para, Brazil. The analysis revealed that, in relation to horizontal structure, intense cutting resulted in changes of different levels mainly to phytosociological frequency of some species, such as, Manilkara huberi , Carapa guianensis and Tabebuia serratifolia . The diameter structure of some species, such as Sextonia rubra and Dipteryx odorata , revealed changes after selective cutting under technically acceptable rates, because the stock levels of some diameter classes surpassed the limits of balance observed for polycyclic systems with silviculture based on natural regeneration. The inclusion of graphics in the harvest operating plan for the 10 most important species listed in forest management, that is, before and after selective cutting, would lead to the desirable structure maintenance. Keywords :    Diameter distribution; cutting cycle; forest management; Amazonian forest; graphic techniques. Resumo Estrutura diametrica e frequencia fitossociologica de uma Floresta de Terra Firme da Amazonia brasileira antes e depois do corte seletivo . O objetivo da presente pesquisa foi caracterizar a estrutura horizontal e diametrica de uma floresta manejada usando tecnicas de expressao grafica. Os dados provieram de um inventario florestal sob completa enumeracao (censo) efetuado em um bloco de 800 hectares, antes e depois de um corte seletivo dentro da Floresta Nacional do Tapajos, localizada no municipio de Belterra, Para. As analises mostraram que a intensidade de corte utilizada promoveu diferentes niveis de alteracao na estrutura horizontal, com mudancas mais significantes nas taxas de frequencia fitossociologica de algumas especies, tais como Manilkara huberi , Carapa guianensis e Tabebuia serratifolia . A estrutura diametrica de algumas especies, tais como Sextonia rubra e Dipterix odorata , apresentou alteracoes apos o corte seletivo acima de taxas tecnicamente aceitaveis, porque o nivel de estoque de algumas classes de diâmetro ultrapassou limites de balanco observado para sistemas policiclicos com silvicultura baseada na regeneracao natural. A inclusao de graficos no plano de operacao de colheita para as 10 especies mais importantes listadas no manejo, isto e, antes e depois do corte seletivo, induziria a estrutura desejada a ser mantida. Palavras-chave: Distribuicao de diâmetro; ciclo de corte; manejo florestal; Floresta Amazonica; tecnicas graficas.

DIAMETER STRUCTURE AND PHYTOSOCIOLOGICAL FREQUENCY OF A “TERRA FIRME” AMAZON FOREST, BEFORE AND AFTER SELECTIVE CUTTING