Variações ecológicas, fitofisionômicas, edáficas e distribuição das espécies em um gradiente ambiental entre campinarana e campina–bacia do rio Demini, AM

Abstract

Campinas and campinaranas are Amazon phytophysiognomies occurring mainly in the Rio Negro basin. There are a few studies about the floristic composition and origin of these vegetation types. Works that seek to relate the geographical distribution of species and vegetation types with soil variables are even rarer. This work has the following goals: to perform a phytosociological study in an area which has transitions between forested campinarana, wooded campinarana and campina; point the relationships between soil and vegetation characteristics along an ecological gradient that permeates these vegetation types. The study area is located in the center-eastern region of the Barcelosmunicipality. Soil samples were also collected in each parcel center. To analyze the relationship between soil and biotic variables were used the PCA and CCA analysis besides the geoecologic profile. The results suggest the flora of the region seems to beoriginated mainly from Guyana highlands and some species may originate from terra firme forests. There was a significant change in floristic composition and other environmental aspects over the ransect. The variables most related to these changes are the groundwater level and particle size.