DYNAMICS OF THE ALTERATIONS OF VEGETAL COVER AND LAND USE WITH THE SUPPORT OF GEOTECHNOLOGY IN THE DESQUITE WATERSHED-SC/DINAMICA DA ALTERACAO DA COBERTURA VEGETAL E USO DA TERRA COM SUPORTE DE GEOTECNOLOGIA NA BACIA HIDROGRAFICA DO RIO DESQUITE--SC

Studies related to the temporal characterization of land use and occupation are indispensable for defining public policies of territorial ordering, allowing to understand the dynamics of the territories occupation and how it affects the water resources of a watershed. The demand for water is increasing and the maintenance of its quality in the springs is a challenge due to the urbanization advance to the neighboring areas and areas of springs recharge, besides interventions in the natural environments for economic activities. This work shows a detailed spatiotemporal analysis of the land use dynamics and occupation in the Desquite watershed, in the municipality of Otacilio Costa, state of Santa Catarina, from the years 1976 to 2016. From the classification of Landsat satellite images, the evolution of the territorial occupation was analyzed comparing the uses and the environmental laws regarding the Areas of Permanent Preservation. A progressive reduction of the areas of native vegetation was noticed, as well as an increase of areas destined to silviculture, including around watercourses. The evolution of the alteration of land use happened rapidly, especially in the periods between 1976 and 2006. As a result of the analysis of conflicts of use in APPs, the results showed that 55,90% of the strips around water courses are occupied with diverse classes of native vegetation.