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Characterization of organic matter in areas under different covers in the Savannah biome (SP) - Brazil. Repositório Alice
PICCOLO, M. C.; BIELUCZYK, W.; REIS, L. C.; PEREIRA, M. G.; BALIEIRO, F. C..
The identification and quantification of labile and recalcitrant soil organic matter (SOM) forms can be used to evaluate the impacts of management on soil quality (SQ). This study characterized the SOM through chemical and granulometric fractionation in areas located in the Savannah biome. Preserved, cultivated and environmental recovering areas were evaluated. For all fractions of SOM, except for the particulate organic carbon (POC), the preserved areas showed higher levels. The SOM had a positive correlation with the cation exchange capacity and negative with bulk density of soil (p ≤ 0.01). The results showed that SOM improved the physical and chemical SQ, and crops reduced the levels of carbon (C) in SOM fractions, negatively affecting the SQ.
Tipo: Anais e Proceedings de eventos Palavras-chave: Fracionamento de carbono; Qualidade do solo; Latossolos; Agricultura tropical; Preservação ambiental; Fracionamento; Carbono; Latossolo; Agricultura; Preservação da natureza; Solo; Qualidade; Carbon; Fractionation; Soil quality; Oxisols; Tropical agriculture.
Ano: 2014 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1001611
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Soil carbon stocks under amazonian forest: distribution in the soil fractions and vulnerability to emission. Repositório Alice
MARQUES, J. D. de O.; LUIZÃO, F. J.; TEIXEIRA, W. G.; NOGUEIRA, E. M.; FEARNSIDE, P. M.; SARRAZIN, M..
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).
Tipo: Artigo de periódico Palavras-chave: Fracionamento de carbono; Estoque de carbono; Aquecimento global; Floresta Amazônica; Brasil.; Física do Solo..
Ano: 2017 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1071125
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