Soil carbon stocks under amazonian forest: distribution in the soil fractions and vulnerability to emission.

• Autor(a) principal: MARQUES, J. D. de O.
• Data de Publicação: 2017
• Outros Autores: LUIZÃO, F. J., TEIXEIRA, W. G., NOGUEIRA, E. M., FEARNSIDE, P. M., SARRAZIN, M.
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice)
• Texto Completo: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1071125; https://doi.org/10.4236/ojf.2017.72008
• topic: Fracionamento de carbono; Estoque de carbono; Aquecimento global; Floresta Amazônica; Brasil; Física do Solo

Transformations 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).