Evaluation of the potential for carbon sink and association with land occupation

Anthropogenic influences on a global scale have caused negative impacts on the environment, among the most prominent being the increase in the concentration of carbon dioxide (CO2). In this study, the objective was then to estimate the potential of carbon flux (CO2 flux) in the riparian vegetation of the Jacareí–Jaguari reservoir, using the digital processing of orbital images of the CBERS 4A system. To determine the CO2 flux, vegetative indices were used: Normalized Difference Vegetation Index (NDVI); Photochemical Reflectance Index (PRI) and the scaled Photochemical Reflectance Index (sPRI), associating them with land use and occupation classifications from the MapBiomas collection, determining the histogram of each class for CO2 flux analysis, revealing CO2 flux between −0.136 and 0.4049. The lower values of CO2 flux in the reservoir are due to the decrease in vegetative classes, indicating the need for (re)planting and plant conservation, confirming the importance of areas with an ecosystem function, of carbon sink. HIGHLIGHTS The vegetation indices show the need for plantation.; The indices were established to have no relationship with aquatic vegetation.; The sPRI presents good correlations with the efficiency of solar energy for photosynthesis.; The NDVI can be used to detect seasonal and temporal variations along the various vegetative stages.; Many factors, diurnal and seasonal, can affect PRI patterns at foliar, canopy and ecosystem levels.;