Carbon sequestration in clay and silt fractions of Brazilian soils under conventional and no-tillage systems

Authors :: Jennifer da Silva Caldas
Cimélio Bayer
Deborah Pinheiro Dick
Cecília Estima Sacramento dos Reis
Source :: Scientia Agricola, Vol 71, Iss 4, Pp 292-301 (2014), Scientia Agricola v.71 n.4 2014, Scientia Agrícola, Universidade de São Paulo (USP), instacron:USP, Repositório Institucional da UFRGS, Universidade Federal do Rio Grande do Sul (UFRGS), instacron:UFRGS, Scientia Agricola, Volume: 71, Issue: 4, Pages: 292-301, Published: AUG 2014
Publication Year :: 2014
Publisher :: Universidade de São Paulo, 2014.
Abstract: The capacity of soils to sequestrate carbon (C) is mainly related to the formation of organo-mineral complexes. In this study, we investigated the influence of soil management systems on the C retention capacity of soil with an emphasis on the silt and clay fractions of two subtropical soils with different mineralogy and climate. Samples from a Humic Hapludox and a Rhodic Hapludox, clayey soils cultivated for approximately 30 years under no-tillage (NT) and conventional tillage (CT) were collected from six layers distributed within 100-cm soil depth from each site and from an adjacent native forest. After the removal of particulate organic matter (POM), the suspension (

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