Plots had been established in quarry's areas undergoing reforestation along transects following the reforestation plan for the backfilled areas. Thus, the transect intersected the following formations: Reforestated formations of 2 years (RF-2 years) - Formations not yet reforested of 2 years (FNR-2 years) - Formations not yet reforested of 1 years (FNR-1 years) - Formations not yet reforested of years (FNR-0 years).
Two plots were installed per formation, in which the species were found in presence / absence with a coefficient of abundance. All woody species not belonging to the six species planted by SanTogo are counted in the regeneration. Their stems are counted and their heights measured. The oil palm (although not woody) has been added to the regeneration. Plots have also been installed in a neighboring formation that is not yet exploited as a control. La formation non encore reboisée de quelques mois (FRN-0an) sera revisitée au mois de juin: le moment où la régénération pourra s'exprimer le plus.