Composição florística e estrutura de Campinaranas na Reserva de Desenvolvimento Sustentável do Rio Negro, Amazônia Central

Abstract

We studied the tree flora of the white-sand vegetation (WSV) in the Lower Rio Negro basin, in the Amazonas state, Central Amazon, Brazil. We established nine plots of 0.03 ha in vegetation formations on sandy soils, and we marked all individuals of trees with a diameter (DBH)> 1 cm. We registered 2387 individuals included in 205 species, 118 genera and 46 families. On average, we registered 265 individuals per plot. The families with the largest number of species in the study area were Fabaceae (30 species), Lauraceae (20), Rubiaceae (16), Chrysobalanaceae (13), Burseraceae and Myrtaceae (10). The genera with the highest species richness were Licania (11 species), Ocotea (11), Protium (9), Macrolobium (7) and Myrcia (7). The most abundant species were Adiscanthus fusciflorus (109 ind.), Acmanthera minima (82), Myrcia grandis (63), Caraipa sp2. (61) and Myrcia clusiifolia (56). Similarity analyzes with other WSV areas suggest that our study area is more floristically similar with geographically close areas than with areas located in the same biogeographic region.