CARACTERIZAÇÃO DE ATRIBUTOS DE SOLOS AO LONGO DE UMA TOPOSSEQUENCIA EM AMBIENTE DE CAMPINARANA NA AMAZÔNIA SUL OCIDENTAL, BRASIL

Abstract

Campinaranas are natural ecosystems which have sandy material as substrate, mainly Spodosols. In the Jurua Valley these environments are used for mineral exploitation and agricultural activities. The objective was to characterize soil attributes in a Campinarana geoenvironment in order to aid its rational use. This study was conducted in the municipality of Cruzeiro do Sul, state of Acre, in a patch derived from sandstones of the Cruzeiro do Sul geological formation. For this study, we used the toposequence procedure, i.e., we studied the soil taking into account the pedologic forms of the environment. From the area study, we opened three soil profiles: in the top, medium slope and lower region. The soils were described and the samples were collected for physical and chemical analyses. The taxonomic classification was conducted according to the Brazilian Soil Classification System. At the top was found the Quartzipsamment, at the lower region a Spodosol and at the medium slope a mix of both soils. The soil physical analyses revealed higher sand proportions in the profiles studied, with predominance of coarse sand, which favours the nutrients leaching, low water holding capacity and increase the susceptibility to soil erosion. The soils are poor in nutrients.