Abstract
Recent studies of Spodosols developed in tropical regions, especially in the Amazon basin, have showed the large capacity of these soils to store carbon in deep Spodic horizons, which occur between 2.5 and 3 m depth. Because of the storage capacity of these horizons, the amount of carbon in Amazon soils is probably higher than we know nowadays, around 13.6 PgC, 12.3 PgC above what had bee…