| In Brazil, Gmelina arborea is a common tree to produce char and the content of carbon is an important factor to correlate with the energy content or carbon sequestration capability, whereas Araucaria angustifolia occupies 6 % of its original territory and Brazilian laws protect old native specimens, since the commercial use of wood is restricted for young cultivated specimens. Electron paramagnetic resonance (EPR) spectroscopy is used for detection and quantification of organic free radicals (OFR) and, in this study, it was utilized for exploring OFR content along the rings of one log from G. arborea and A. angustifolia trees, both randomly chosen. The amount of OFR correlated with the carbon content in G. arborea and the age of rings in G. arborea and A.... |
