Français : Stacking of thousands of "Landes pine" stumps, after mechanical removal of pine stumps in an industrial big clearcutting, on an oligotrophic sandy substrate, in a context of very intensive silviculture, in France ( Landes de Gascogne ), august 2018. These stumps could have been a source of carbon and of mycelium favorable to the conservation of water and carbon in the soil, and to the improvement of soil (originally non-forested in this sandy region). In this sort of industrial silviculture, this biomass is difficult to valorize thermally because those remnants contain yet sand and pebbles that use or break the shredding knives.