Abstract
Changes in carbon stocks in different compartments of soil organic matter of a clayey Latossolo Vermelho Distrofico (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 CO2 emissions by up to 12 %.
Highlights
Soil organic matter (OM) is all the organic material in the fraction
Recent investigations showed that methodological differences are a source of variability in estimates of soil C storage (Batlle-Bayer et al, 2010), with regard to conversion of land use, which always brings about changes in bulk density (Ellert et al, 2002; Don et al, 2011)
Whereas in the upper 0.30 m, reductions of 9 and 12 % were observed in the conventional systems (CT-DP and conventional tillage with moldboard plow (CT-MP)), respectively, compared to the corresponding no-tillage treatments (NT1 and NT2), there was no significant difference between agricultural systems in the 0.30 to 1.00 m layer
Summary
Soil organic matter (OM) is all the organic material in the fraction
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