Características geomorfológicas e relações solo-vegetação em Boa Vista, município de Quatipurú, Pa

Abstract

The coast of Salgado Paraense is part, with Maranhão, of the northern Brazilian river coast, known as the "Pará-Maranhão reentrances". The short-term objective was to emphasize geomorphological processes and soil-vegetation interrelations. The focus of this work was on quantitative analyses and not only on field observations. Soil samples were taken from a profile at the boundary of the mangrove and coastal plateau and are characteristic of the area. The chemical elements Na, K, Ca, Mg, P and AI, the Carbon and Organic Matter contents and pH's in H20 and KCI (EMBRAPA, 1997 EFCAP, 1991) were determined, as well as the granulometry that gave rise to the granulometric curves of the profile. The results of the element analysis showed that the values decreased with the depth of the profile, with the values of the A horizon being much higher than the other horizons. The soil collected in the Boa Vista sector is a sandy loam material, classified as Neo soil. The geomorphological characteristic found in Quatipuru is that of a coastal environment. The presence of sandbanks, beaches, apicuns, dunes, abrasion platform and fluvio-marine terraces, low plateaus, tidal channels, sandy islands and bars, cliffs, small rocky coasts, frontal and estuarine mangroves, swamps, floodable fields, are examples of the great diversity of forms and vegetation randomly grouped in the coastal environment. Geomorphological studies contribute to the knowledge of the physiognomy, structure, and dynamics of the landscape. The laboratory work will be developed in the second semester, and published later. This study serves as a first geomorphological approach, contributing to the study of the morphology and dynamics of the Pará coastal space.