PHYSICO-CHEMICAL CHARACTERIZATION OF SHALLOW TO DEVELOPED SOIL (ASSOCIATION NEOSSOLO QUARTZARÊNICO) AND HYDROMORPHIC SOIL (ASSOCIATION GLEISSOLO HÁPLICO): THE ENVIRONMENTAL CONTEXT OF THE HYDROGRAPHIC BASIN OF CACHORROS RIVER, SÃO LUÍS-MA

Abstract

The assignment aimed to characterize the physico-chemical properties of a shallow to developed soil (association Neossolo Quartzarênico) and a hydromorphic soil (association Gleissolo Háplico) by the environmental context of the hydrographic basin of Cachorros river, São Luís-MA. The materials and methods included the characterization of soils in two representative points which fieldwork and physical and chemical laboratory analysis were carried out. Moreover, cartographic documents were elaborated with emphasis on morphodynamic profiles A-B and C-D. The results showed that the soils are moderately to strongly acid and sandy, indicating values higher than 872 g.Kg-¹ of sand and textural classes “Sand” and “Loamy sand”. The shallow to developed soil are degraded in view of activity of mineral extraction. As a consequence, the vegetation and surface horizon were removed with low organic matter in the soil. The hydromorphic soil, under vegetal formation, has highest quantity of organic matter.