Análise florística e estrutural do estrato arbóreo em floresta de várzea no município de Santa Bárbara do Pará, estado do Pará, Brasil.

Abstract

The objective of this research went know to composition and structure floristic of a forest floodplain located in the Santa Bárbara of Pará, State of Pará, Brazil. This study were realized in four areas of 1 hectare and divided in five transects of 20 x 100 meters. Soon after mensured the trees with DAP> 10 cm and palm trees with CAP >10 cm and was estimated height. In the açaí palm were quantify number multiple stems, plants and rebrotations. For analysis floristic and structure were utilized and FITOPAC Program; Biostat 3.0 for stratication and classes and circuference of açaí palm and Origin 5.0 Program for regression analysis. Determination coeficients and graphics. This results showed 70 species distributed in 29 families and 50 genera; Caesalpiniaceae and Mimosaceae obtained ligh diversity (8 and 9 species respectably); Arecaceae obtained high density (27,75%) and Fabaceae high index of importance (68,21). The index diversity in floodplain forest of (2,63) considered low, equability of 0,63 and similarity of 0,6. The areas 1, 3 and 4 were relatively abundant in number of plants and rebrotations. This height, circunference and rebrotations showed elevated variations coefficients with positive correlations in the four areas. The circunference classes to correlate cositively only in area 2 and this height classes to correlate negatively in the four areas. The Classe II apresented high in number plants with circunference and height. This floristic and structures analysis in the species showed informations importants for management of açaí palm.