2016-05-052007-03-30SOUSA, M. S. As transformações da paisagem: contribuição ao estudo da formação de areais na bacia do Ribeirão Sujo, município de Serranópolis/GO. 2007. 205 f. Dissertação (Mestrado em Geografia) - Universidade Federal de Goiás, Goiânia, 2007.http://repositorio.bc.ufg.br/tede/handle/tede/5518The “Ribeirão Sujo” is a right edge tributary stream of “Rio Verde”, that is, for its time, a tributary of “Paranaíba” river. Its watershed encloses a 40 sq miles (165 km2) area inside Serranópolis municipality, into the Goiás southwest micro region, that features extensive spots of degraded sandy soils, called “sandy spots”. The natural circumstances and landscape transformations by the social processes was analyzed in order to understand this sandy spots development. The analysis was based also on individual and integrated evaluation of the landscape physical elements, from which six landscape units had been selected. The landscape units, potentialities and limitations, were evaluated, based on: soil agricultural capacity, potential fragilities and environment laws. Landscape changes by socioeconomic process and its historical changes were verified by comparing soil use into different cycles, as well as its implications into the landscape units. The Ribeirão Sujo watershed landscape crosses a series of transformations resulting from the social activities that were established on it. The most important of these transformations takes place from the 80's, with the beginning of modern agricultural activities, mainly the sugar cane. Finally, it was analyzed the sandy spots distribution and characteristics, identifying its aspects of origin and evolution, emphasizing the understanding of soil degradation level. The sandy spots growth process wraps up a dynamic that unchained from the improper soil management in a high potential fragility area, originating small sand spots, whose descriptive evolution comprises, generally, the following steps: firstly, the remove of native vegetation and the introduction of sugar cane culture on the area. After, a grass type, naming brachiaria sp, was sowed, whose establishment became precarious in consequence of the low soil fertility and inadequate management, unchaining erosive processes and reduction in nutrients and organic substances. Finally, the relative excess of pasture-pressure determined the total collapse of the pasture and of the weak structure of the topsoil. These facilitate the sandy spots expansion. The sandy spots extension already covers 1.4 % of the watershed area, where the greatest spot reaches approximately 79 ha. This sandy spots occupies various topographic positions, with bigger incidence in convex slopes and, secondarily, in concave slopes and tops. At present, it's verify in the sandy spots the occurrence of sheet erosion and, with lesser extend, rill and aeolian erosion; however, it was not verify exclusive causal analogy between erosion and sandy spots growth, nor the sandy spots occurrence were determined only by the sand deposition. Concluding, one of the main factors that determine the sandy spots growth is the soil use and management. It's suggested, immediately, the implementation of mitigating measures in order to restrain the sandy spots advancement and, in the future, its possible recovering.application/pdfAcesso AbertoCerradoFragilidade ambientalUso e manejo do soloAreaisCerradoEnvironment brittlenessSoil application and handlingSandy spotsGEOCIENCIAS::GEOGRAFIA FISICADissertação