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The aim of this investigation was to study the structure, distribution patterns, and dynamics of tree species in a remnant of the Semideciduous Seasonal Alluvial Forest in the Upper Paraná River Floodplain, Brazil. Spatial variation of the vegetation was considered mainly in relation to soil and topographic characteristics. The 5,946 m² study area extended along a transect from the bank of the Paraná River across the floodplain, passing through a lake. Phytosociological analysis were performed for 36 plots, each 150 m². Subanalysis were performed for 300 m² zones. Soil characteristics and topographic profile and their relationship to the vegetation were analyzed. Hydrodynamic and sediment processes were the most important factors in vegetation establishment and succession, determining species selection and formation and evolution of the substrate. These processes and their local spatial variability fundamentally affected the dynamics, structure, and patterns of distribution. O objetivo deste trabalho foi analisar a estrutura, o padrão de distribuição e a dinâmica de espécies arbóreas de um fragmento remanescente da Floresta Estacional Semidecidual Aluvial na planície de inundação do alto rio Paraná frente às variações espaciais, principalmente em relação ao solo e às características topográficas. A área de estudo compreendeu um transecto desde a margem do rio Paraná até a várzea, passando por uma lagoa. Foram analisadas fitossociologicamente 36 parcelas de 150m² e realizadas subanálises em faixas de 300m². Foram levantadas as características do solo, o perfil topográfico da área e suas relações com a vegetação. Os processos hidrodinâmicos e hidrossedimentológicos mostram ser os fatores de maior importância no estabelecimento e sucessão da vegetação, determinando a seleção de espécies e a formação e evolução do substrato, refletindo assim, na dinâmica, na estrutura e no padrão de distribuição da vegetação a variabilidade espacial local

brazilian archives of biology and technology

Structure, composition and spatial distribution of tree species in a remnant of the semideciduous seasonal Alluvial Forest of the upper Paraná River Floodplain