Régia Estevam Alves
Abstract:
This dissertation aimed to characterize the physiognomy of the landscape from the environmental fragility of the Ribeirão da Picada watershed in Jataí/GO. For this study two methodologies were used: one proposed by Ross (1994), for the determination of environmental fragility based on the slope indexes, and the other, proposed by Bertrand (2007), for landscape characterization using information on environmental fragility. With this in mind, this study was based on mappings of the environmental characteristics of the basin, namely: soil, geology, hypsometry, slope, erosivity, potential and emerging fragility, and land use. Subsequently, a landscape characterization map was generated based on land use evolution mapping, potential and emerging fragility maps, and slope map. The results showed that in the Ribeirão da Picada River Basin potential fragility predominates with strong and very strong classes. However, the emerging fragility of the basin has classes ranging from medium to very strong, depending on the types of land use that the basin has been subjected to. Thus, the basin landscape is characterized by three types of geosystems: marginal mosaic geosystems; degraded geosystems with regressive dynamics; degraded geosystems with progressive to regressive dynamics. In the marginal mosaic geosystems were observed geofatile with ecological potential in resists presenting different types of soil degradation, such as erosion and arenization without vegetation cover, and geofatile with ecological potential in biostasis, where as the areas do not present degradation processes, such as forest areas. In degraded geosystems with regressive dynamics, it was observed that the ecological potential is in biostasis, as these are areas in which there is a certain balance between ecosystems and anthropic actions, and even having agricultural activities, the vegetation has been regenerating in recent years. years. However, degraded geosystems with progressive to regressive dynamics are areas in which they have been intensely anthropized and which are currently in the process of vegetation regeneration, thus considering that the ecological potential is in biostasy. In light of this, the methodologies used for the characterization of the landscape physiognomy of the Ribeirão da Picada Watershed effectively met the needs of the research, enabling both the understanding of ecosystems and anthropic actions.
