Estudos florísticos e fitossociológico de um campo de restinga da APA da costa do Urumajó, município de Augusto Corrêa-PA

Abstract

In Pará, the municipalities bordering the Atlantic Ocean make up the salt marsh physiographic zone. This region presents different types of vegetation, such as fields, restingas, secondary forest, remaining areas of primary forest, among 44 others. The Environmental Protection Area (APA) of the Urumajó coast is located in the municipality of Augusto Corrêa in northeastern Pará, with central geographic coordinates 00°52'54" Se 46°26'54" W. The present work aims to characterize floristically and phytosociologically a restinga field, which is one of the vegetation types that make up the APA, thus contributing to the environmental management plan of the area and to the promotion of knowledge about the coastal ecosystems of the State. A phytosociological survey was carried out using the Muller-Dombois & Ellenberg (1974) plot method. The restinga fields occur in the central portions of the APA, occupying different extensions, and are composed of herbaceous vegetation, mainly Cyperaceae and Gramineae. A total of 22 species, distributed in 9 families, were sampled in 100 m2. In terms of importance, the Gramineae, Cyperaceae and Leguminosae families occupied the first three positions, with the first two, when added together, reaching 83.95% of the total VI. The three most representative species in VI, Sporobolus virginicus, Paspalum pleostachyum and Fimbristylis cymosa, together correspond to 65.98% of the total. Paspalum pleostachyum ranks 2nd in relation to VI, although its relative frequency is higher than that of Sporobolus virginicus (1st in VI). When compared to other studies in similar areas, the field in question shows a low specific richness, reinforcing the need for botanical studies on our coast.