POTENTIAL FOR ORGANIC CARBON SEQUESTRATION EXPLAINED BY MINERALOGY AND MICROBIOLOGY FROM SPECTRAL TRANSFER FUNCTIONS

The soil's capacity to sequester carbon and reduce the concentration of CO2 in the atmosphere is limited and depends on the minerals that constitute the clay fraction and their interaction with the microbiota. The carbon sequestration potential of these minerals of the fine fraction was calculated following the proposal of Hassink [1], in different soils. Microbial activity was mapped using MIR reflectance spectroscopy products. The prediction of carbon sequestration was fitted to a spatial error model (SEM), whose explanatory variables are associated with hematite, kaolinite goethite, relative abundance of fungi, actinomycetes, acidobacteria, microbial biomass carbon, enzymatic activity of glucosidasea and urease, and labile and resistant forms of carbon. The influence of soil use on carbon sequestration potential was observed, highlighting areas with a mosaic of pastures and crops, with a high presence of these minerals.