01468naa a2200265 a 450000100080000000500110000800800410001902400480006010000250010824501360013326000090026952006320027865000200091065300230093065300110095365300230096465300240098765300290101170000190104070000200105970000200107970000210109970000170112077300650113720711252021-11-11       2017    bl uuuu     u00u1 u    #d7 ahttps://doi.org/10.4236/ojf.2017.720082DOI1 aMARQUES, J. D. de O.  aSoil carbon stocks under amazonian forestbdistribution in the soil fractions and vulnerability to emission.h[electronic resource]  c2017  aTransformations of natural ecosystems in tropical regions, which are usually covered by high-biomass forests, contribute to increased atmospheric CO2. Much of the carbon in forest ecosystems is stored in the soil. This study estimates soil carbon stock in a dense forest in central Amazonia from sets of soil samples collected in three topographic positions (plateau, slope and valley bottom). Soil organic matter (SOM) was fractionated by density and particle size, thus obtaining the free light fraction (FLF), intra-aggregated light fraction (IALF), sand fraction (F-sand), clay fraction (F-clay) and silt fraction (F-silt).  aFísica do Solo  aAquecimento global  aBrasil  aEstoque de carbono  aFloresta Amazônica  aFracionamento de carbono1 aLUIZÃO, F. J.1 aTEIXEIRA, W. G.1 aNOGUEIRA, E. M.1 aFEARNSIDE, P. M.1 aSARRAZIN, M.  tOpen Journal of Forestrygv. 7, n. 2, p. 121-142, Apr. 2017.