Análise do estágio de recuperação de áreas degradadas em locais que foram desenvolvidos prads na usina hidrelétrica Machadinho

Abstract

Degraded Area Recovery Plans (PRADs) play a fundamental role in environmental management and in the restoration of areas impacted by human activities. Among the projects that most alter land cover and landscape dynamics, hydroelectric plants stand out, generating significant impacts on local ecosystems. However, some of these impacts can be mitigated through PRADs, which include strategies such as soil recomposition, planting native seedlings and promoting natural regeneration. This study aimed to evaluate the recovery stage of degraded areas of the Machadinho Hydroelectric Power Plant, located in the Uruguay River Basin. To this end, were analyzed ecological indicators of environmental recovery, using as reference the parameters and methodology established by Resolution SMA 32/2014 and Ordinance CBRN 01/2015 of the State of São Paulo, in addition to complementary indicators. The evaluation was carried out through floristic and phytosociological surveys, allowing a detailed diagnosis of the ecological recovery process. The results indicated a positive trend in the regeneration of vegetation cover over time. The average soil coverage by native vegetation exceeded 80%, with 64% of the analyzed plots being classified as having an adequate level of recovery. There was an increase in the density of regenerating native individuals in the number of regenerating native species. More than 90% of the evaluated plots (94%) were in a medium or advanced successional stage of regeneration. The data suggest a progressive advance in environmental reestablishment, driven both by the natural dynamics of ecological succession and by the restoration interventions implemented.