Dinâmica do uso e cobertura da terra com a utilização de geotecnologias: estudo na Área de Proteção Ambiental da Margem Direita do Rio Negro, Setor Paduari-Solimões

Abstract

This research main objective is to study the recent dynamics in the usage and coverage of the land in The Área de Proteção Ambiental da Margem Direita do Rio Negro; Setor Paduari - Solimões (Negro River Right Bank Environmental Protection Area; Sector Paduari - Solimões), with the use of remote sensing techniques and geographical information systems GIS. To achieve this, an updated cartographic base has been structured containing biophysical aspects of the area, followed by a multi-temporal mapping of all changes occurred to the land‟s usage and coverage during the years of 2005 and 2011, using images from the Landsat-5 satellite. Finally, all the aspects in the land‟s usage that go against the environmental legislation were identified. The area analyzed is a conservation unit for sustainable use, located in the interfluve of Rivers Negro and Solimões, in the state of Amazonas, Brazil. Its perimeter crosses part of the Iranduba, Manacapuru and Novo Airão cities, all belonging to the metropolitan area of Manaus. Maps were generated for each of the following topics: soil, geology, geomorphology, hypsometry, declivity, hydrography, drainage network, vegetation, deforestation and areas of permanent preservation. The soil class Yellow Podzolic Latosol is predominant in 79.22% of the area. The geological set named Formação Alter do Chão corresponds to 78.51% of the surface. The morphostructural unit Dissected Highlands of the Negro and Uatumã Rivers, dominates geomorphologically with 88.37%. 69.07% is the percentage of ground layers situated between 50 and 80 m of altitude. The relief is predominantly flat and mildly hilly in 81.27% of the surface. The total extension of river channels was calculated in 5,769.28 km that corresponds to a drainage density of 1.27 km/km². The dense ombrophilous forest represents 80.6% of the surface. The accumulated deforestation until 2005 was of 431.06 km² corresponding to 9.25% of the extension of environmental protection area. In the following 6 years the deforestation continued to grow on a yearly average of 3.04%. In 2011 the total deforestation has reached 515.83 km² that represents a growth of 19.66% of the deforested area in the period. The areas of permanent preservation, mainly riparian forests and springs, occupy 11.72% of the area and, of this total, 15.72% have a greater human impact and are considered to have a conflicted usage. The area shows a worrying and accelerated process of human impact influenced mainly by the red ceramics industries and roads. A better application of public policies, that helps arrange and discipline the land‟s occupation and usage, together with a change in the energy matrix adopted nowadays by the local ceramic industry can help to slow down the process of human impacts to forests in the future.