Changes in soil organic carbon storage under different agricultural management systems in the Southwest Amazon Region of Brazil

Estoques de carbono e nitrogênio no solo cultivado com mamona na Caatinga

“…Atualmente, o carbono (C) e o nitrogênio (N) frequentemente têm sido utilizados como indicadores da qualidade do solo, tanto em sistemas agrícolas como em áreas de vegetação nativa (Jansen, 2005 Em estudos realizados nos diferentes biomas brasileiros, de maneira geral, os autores demonstraram haver relação entre o teor de C e N do solo e o tipo de vegetação (Siqueira Neto et al, 2009Maia et al, 2009Maia et al, , 2010Frazão et al, 2010). Especificamente para o bioma Caatinga, os autores discutem tanto ganhos como perdas nos estoques de C e N nos diferentes usos do solo (Maia et al, , 2007Assis et al, 2010;Sousa et al, 2012), sem que haja consenso sobre a dinâmica da MOS em função da mudança de uso.…”

Changes and controlling factors of cropland soil organic carbon in North China Plain over a 30-year period

“…The data in an LMM can be correlated and the variability is not necessarily constant. LMMs have been used to model the SOC dynamics in a hierarchical sampling structure (Goidts et al 2009;Maia et al 2010;Suuster et al 2012) and have a high prediction accuracy (Suuster et al 2012). In our study, the SOC changes at all soil sampling sites were set as response variables.…”

Brazil’s Amazonian forest carbon: the key to Southern Amazonia’s significance for global climate

“…In Amazonian soils, the fast turnover organic matter is concentrated near the soil surface (de Marques et al 2015), which is where increases in soil temperature are greatest when forests are cleared, and this would also be the layer undergoing the greatest effects of climate change. After deforestation, changes in soil organic matter depend heavily on management, with a variety of techniques resulting in enhanced organic matter retention (e.g., Fujisaki et al 2015;Maia et al 2009Maia et al , 2010Perrin et al 2014). Nevertheless, the dominant land use in Brazilian Amazonia continues to be cattle pasture with minimal management (Fearnside 2005).…”