Carbon Stocks in Compartments of Soil Organic Matter 31 Years after Substitution of Native Cerrado Vegetation by Agroecosystems

Abstract

Changes in carbon stocks in different compartments of soil organic matter of a clayey Latossolo Vermelho Distrófico (Typic Haplustox), caused by the substitution of native savanna vegetation (cerrado sensu stricto) by agroecosystems, were assessed after 31 years of cultivation. Under native vegetation, a stock of 164.5 Mg ha -1 C was estimated in the 0.00-1.00 m layer. After 31 years of cultivation, these changes in soil C stocks were detected to a depth of 0.60 m. In the case of substitution of cerrado sensu stricto by no-tillage soybean-corn rotation, a reduction of at least 11 % of the soil C pools was observed. However, the adoption of no-tillage as an alternative to tillage with a moldboard plow (conventional system) reduced CO 2 emissions by up to 12 %.

Understanding the relations between soil organic matter fractions and N2O emissions in a long‐term integrated crop–livestock system

“…Larger C MIC in no-till systems, especially in CLS-NT, might be attributed to the absence of soil disturbance, which potentially increases the role of soil fauna (Marchão et al, 2009). This loss of microbial biomass was attributed by Ferreira et al (2016) to the lack of readily available substrate in fractions <53 μm because of soil pulverization caused by continuous tillage. The C MIC is a property that is very sensitive to changes caused by land use and could be used as a soil quality indicator.…”

Estado Nutricional E Produtividade Da Soja Após Aplicação De Calcário E Gesso Com E Sem Revolvimento Do Solo

“…KEYWORDS: Availability, fertility, soil. (RAMOS et al, 2015;BEUTLER et al, 2016;FERREIRA et al, 2016;OLIVEIRA et al, 2016;SILVA et al, 2016;TEIXEIRA et al,2016;SILVA et al, 2017 No local de estudo foram selecionadas cinco áreas distintas, limítrofes, sob as mesmas condições topográfi cas e edafoclimáticas (mesmo solo e clima, textura média, relevo plano), diferenciando-se apenas no uso e manejo adotado. As áreas avaliadas foram: A1 sob mata nativa não disturbada; a A2 área com culturas anuais;…”

Cobre No Solo E O Crescimento Inicial De Espécies De Eucalipto

“…O semiárido brasileiro, possui uma área aproximada de 980.134 km², abrange cerca de 12% do país e 63% da região Nordeste, compreendendo os estados de Alagoas, Bahia, Ceará, Paraíba, Pernambuco, Piauí, Sergipe e norte de Minas Gerais (INSA, 2017). A região semiárida é tipificada por temperaturas elevadas, chuvas mal distribuídas, com solos pouco desenvolvidos (MARINHO et al, 2016;NETO et al, 2017 (RAMOS et al, 2015;BEUTLER et al, 2016;FERREIRA et al, 2016;OLIVEIRA et al, 2016;SILVA et al, 2016;TEIXEIRA et al,2016;SILVA et al, 2017 No local de estudo foram selecionadas cinco áreas distintas, limítrofes, sob as mesmas condições topográfi cas e edafoclimáticas (mesmo solo e clima, textura média, relevo plano), diferenciando-se apenas no uso e manejo adotado. As áreas avaliadas foram: A1 sob mata nativa não disturbada; a A2 área com culturas anuais;…”