Shrub-tree vegetation in a restinga of Jaguaruna, southern coast of Santa Catarina, Brazil

Abstract In order to develop a greater understanding of the coastal land of the state of Santa Catarina, we carried out a phytosociological study of shrub-tree component in the restinga of the Lagoa do Arroio Corrente, in the municipality of Jaguaruna, in the southern part of the state. The study used the “plots” method, including shrub-trees with a diameter at soil height (DSH) minimum of 2.5 cm. We found a difference in the height of shrub-trees individuals in the upper (10 m) and lower (5 m) sections, and opted to carry out sampling in these two vegetation types separately. The restinga’s vegetation of the Lagoa do Arroio Corrente had, in the upper section, low size stratification (1 to 5 m), due to shrubby individuals, with dense vegetation cover, due to the development of clusters of plants and, in the lower section, with emerging individual trees, resulting in two strata: a lower stratum, with predominance of shrubby (2 to 5) and an upper stratum, with tree individuals (up to 10 m). The floristic richness resulted in 17 botanical families, 25 genera and 32 species. The total basal area was 4.3 m2.ha-1 (upper section) and 23.2 m2.ha-1 (lower section). Guapira opposita (Vell.) Reitz exhibited the highest importance value, with other outstanding phytosociological parameters (frequency, density, and dominance). The analyses performed contribute to structural data for restingas of Santa Catarina, assisting in the characterization of vegetation of sand bars of Southern Brazil.