ECOLOGICAL SUPPORT PROCESSES IN PLANNING AND DESIGN OF REGIONAL GREEN INFRASTRUCTURE: Studies of carbon fluxes in the landscape
Landscape; Regional planning; Green infrastructure; Ecosystem Services; Carbon; Remote sensing.
Ecosystem services comprise all the benefits and assets provided by nature to support human activities through the provision of resources and regulation of the environment, providing sociocultural well-being. In cities, the absence of ecosystem services can be associated with droughts, climate changes, floods and landslides, reflections of a territorial order dissociated from nature. They are services anchored in the environmental integrity resulting from the link between the ecological support processes: primary production, nutrient cycle and soil formation. Such processes have, in the presence of vegetation and carbon flow in the landscape, their best expression and demand the knowledge about how to plan, design and monitor the access to ecosystem services. This understanding demands that the planning of the territory should consider and have the means to measure their presence and support decisions about the use and land occupation. Therefore, this thesis proposes guidelines for structuring a network of multiscale and multifunctional green infrastructures, for the territory of the Distrito Federal (DF), aiming at the integrity of the ecological support processes, and, as a result, of the ecosystem services considered as finals (regulation, provision and culture). As a method of identifying potentially structuring areas for this network, the CO2flux spectral index (related to carbon fluxes and the photosynthetic efficiency of vegetation) and the Topographic Wetness Index (TWI), (which expresses the tendency of accumulation and flow of water through the topography) were applied to the DF landscape. The intersection of these indices resulted in different demands for ecological recovery, whose areas with ecological integrity subsidized analyses in Landscape Ecology. By using Geodesign, the information generated, along with other layers of information from official databases, integrated a workshop of specialists, which in co-design defined the general contours of a network of regional green infrastructures for the district territory. After analyzing the results of the workshop, a mosaic of biophysical types was proposed, consisting of hotspots, ecological corridors, and ecological support patches, forming a corridor through the São Bartolomeu Hydrographic Basin. The proposition of preservation, adaptability and transformability strategies was based on Landscape Ecology studies, considering the spatialization and approximate calculation of areas that should receive such actions. This step also led to the dimensioning of trees and carbon stored in tree biomass with an estimate of carbon credits. The study showed that the biophysical processes not only support ecosystem services, but also enable the design of green infrastructure networks from the regional scale, through understanding the degree of implementation of ecological support processes in the territory.