Carbon sequestration in clay and silt fractions of Brazilian soils under conventional and no-tillage systems
Autor(a) principal: | |
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Data de Publicação: | 2014 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRGS |
Texto Completo: | http://hdl.handle.net/10183/118669 |
Resumo: | 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 (<53 μm) was sonicated, the silt and clay fractions were separated in accordance with Stokes' law and the carbon content of whole soil and physical fractions was determined. In the Humic Hapludox, the clay and silt fractions under NT showed a higher maximum C retention (72 and 52 g kg−1, respectively) in comparison to those under CT (54 and 38 g kg−1, respectively). Moreover, the C concentration increase in both fractions under NT occurred mainly in the topsoil (up to 5 cm). The C retention in physical fractions of Rhodic Hapludox varied from 25 to 32 g kg−1, and no difference was observed whether under an NT or a CT management system. The predominance of goethite and gibbsite in the Humic Hapludox, as well as its exposure to a colder climate, may have contributed to its greater C retention capacity. In addition to the organo-mineral interaction, a mechanism of organic matter self-assemblage, enhanced by longer periods of soil non-disturbance, seems to have contributed to the carbon stabilization in both soils. |
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Reis, Cecília Estima Sacramento dosDick, Deborah PinheiroCaldas, Jennifer da SilvaBayer, Cimelio2015-07-07T02:01:44Z20140103-9016http://hdl.handle.net/10183/118669000951036The 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 (<53 μm) was sonicated, the silt and clay fractions were separated in accordance with Stokes' law and the carbon content of whole soil and physical fractions was determined. In the Humic Hapludox, the clay and silt fractions under NT showed a higher maximum C retention (72 and 52 g kg−1, respectively) in comparison to those under CT (54 and 38 g kg−1, respectively). Moreover, the C concentration increase in both fractions under NT occurred mainly in the topsoil (up to 5 cm). The C retention in physical fractions of Rhodic Hapludox varied from 25 to 32 g kg−1, and no difference was observed whether under an NT or a CT management system. The predominance of goethite and gibbsite in the Humic Hapludox, as well as its exposure to a colder climate, may have contributed to its greater C retention capacity. In addition to the organo-mineral interaction, a mechanism of organic matter self-assemblage, enhanced by longer periods of soil non-disturbance, seems to have contributed to the carbon stabilization in both soils.application/pdfengScientia agricola. Piracicaba. Vol. 71, n. 4 (July/Aug. 2014), p. 292-301Solo : Análise químicaQuímica do soloCarbonoPlantio diretoMatéria orgânicaFracionamentoCarbon saturationMineralogyPhysical fractionationSoil organic matterSoil profileCarbon sequestration in clay and silt fractions of Brazilian soils under conventional and no-tillage systemsinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/otherinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFRGSinstname:Universidade Federal do Rio Grande do Sul (UFRGS)instacron:UFRGSORIGINAL000951036.pdf000951036.pdfTexto completo (inglês)application/pdf374332http://www.lume.ufrgs.br/bitstream/10183/118669/1/000951036.pdfec15bf42e040108bccec4b44d7bae45fMD51TEXT000951036.pdf.txt000951036.pdf.txtExtracted Texttext/plain47249http://www.lume.ufrgs.br/bitstream/10183/118669/2/000951036.pdf.txt577595caa9f1d3e790f63a36d18892a8MD52THUMBNAIL000951036.pdf.jpg000951036.pdf.jpgGenerated Thumbnailimage/jpeg1955http://www.lume.ufrgs.br/bitstream/10183/118669/3/000951036.pdf.jpg85d0325a6f4edff42238d8135a530ef7MD5310183/1186692022-02-22 05:00:29.189355oai:www.lume.ufrgs.br:10183/118669Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2022-02-22T08:00:29Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
Carbon sequestration in clay and silt fractions of Brazilian soils under conventional and no-tillage systems |
title |
Carbon sequestration in clay and silt fractions of Brazilian soils under conventional and no-tillage systems |
spellingShingle |
Carbon sequestration in clay and silt fractions of Brazilian soils under conventional and no-tillage systems Reis, Cecília Estima Sacramento dos Solo : Análise química Química do solo Carbono Plantio direto Matéria orgânica Fracionamento Carbon saturation Mineralogy Physical fractionation Soil organic matter Soil profile |
title_short |
Carbon sequestration in clay and silt fractions of Brazilian soils under conventional and no-tillage systems |
title_full |
Carbon sequestration in clay and silt fractions of Brazilian soils under conventional and no-tillage systems |
title_fullStr |
Carbon sequestration in clay and silt fractions of Brazilian soils under conventional and no-tillage systems |
title_full_unstemmed |
Carbon sequestration in clay and silt fractions of Brazilian soils under conventional and no-tillage systems |
title_sort |
Carbon sequestration in clay and silt fractions of Brazilian soils under conventional and no-tillage systems |
author |
Reis, Cecília Estima Sacramento dos |
author_facet |
Reis, Cecília Estima Sacramento dos Dick, Deborah Pinheiro Caldas, Jennifer da Silva Bayer, Cimelio |
author_role |
author |
author2 |
Dick, Deborah Pinheiro Caldas, Jennifer da Silva Bayer, Cimelio |
author2_role |
author author author |
dc.contributor.author.fl_str_mv |
Reis, Cecília Estima Sacramento dos Dick, Deborah Pinheiro Caldas, Jennifer da Silva Bayer, Cimelio |
dc.subject.por.fl_str_mv |
Solo : Análise química Química do solo Carbono Plantio direto Matéria orgânica Fracionamento |
topic |
Solo : Análise química Química do solo Carbono Plantio direto Matéria orgânica Fracionamento Carbon saturation Mineralogy Physical fractionation Soil organic matter Soil profile |
dc.subject.eng.fl_str_mv |
Carbon saturation Mineralogy Physical fractionation Soil organic matter Soil profile |
description |
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 (<53 μm) was sonicated, the silt and clay fractions were separated in accordance with Stokes' law and the carbon content of whole soil and physical fractions was determined. In the Humic Hapludox, the clay and silt fractions under NT showed a higher maximum C retention (72 and 52 g kg−1, respectively) in comparison to those under CT (54 and 38 g kg−1, respectively). Moreover, the C concentration increase in both fractions under NT occurred mainly in the topsoil (up to 5 cm). The C retention in physical fractions of Rhodic Hapludox varied from 25 to 32 g kg−1, and no difference was observed whether under an NT or a CT management system. The predominance of goethite and gibbsite in the Humic Hapludox, as well as its exposure to a colder climate, may have contributed to its greater C retention capacity. In addition to the organo-mineral interaction, a mechanism of organic matter self-assemblage, enhanced by longer periods of soil non-disturbance, seems to have contributed to the carbon stabilization in both soils. |
publishDate |
2014 |
dc.date.issued.fl_str_mv |
2014 |
dc.date.accessioned.fl_str_mv |
2015-07-07T02:01:44Z |
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publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10183/118669 |
dc.identifier.issn.pt_BR.fl_str_mv |
0103-9016 |
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000951036 |
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http://hdl.handle.net/10183/118669 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.ispartof.pt_BR.fl_str_mv |
Scientia agricola. Piracicaba. Vol. 71, n. 4 (July/Aug. 2014), p. 292-301 |
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openAccess |
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