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 | Acesso ao texto completo restrito à biblioteca da Embrapa Agrobiologia. Para informações adicionais entre em contato com cnpab.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Agrobiologia. |
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Data corrente: |
25/04/2008 |
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Data da última atualização: |
25/04/2008 |
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Autoria: |
PEIXOTO, R. S.; COUTINHO, H. L. C.; MADARI, B.; MACHADO, P. L. O. A.; RUMJANEK, N. G.; VAN ELSAS, J. D.; SELDIN, L.; ROSADO, A. S. |
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Título: |
Soil aggregation and bacterial community structure as affected by tillage and cover cropping in the Brazilian cerrados. |
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Ano de publicação: |
2006 |
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Fonte/Imprenta: |
Soil & Tillage Research, Amsterdam, v. 90, n. 1-2, p. 16-28, nov. 2006. |
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Idioma: |
Inglês |
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Conteúdo: |
Microbial-based indicators of soil quality are believed to be more dynamic than those based on physical and chemical properties. Recent developments in molecular biology based techniques have led to rapid and reliable tools to characterize microbial community structures. We determined the effects of conventional and no-tillage in cropping systems with and without cover crops on bacterial community structure, total organic carbon (TOC) and soil aggregation. Tillage and rotation did not affect TOC from bulk soil. However, TOC was greater in the largest aggregate size class (7.98?19 mm), and had greater mean-weight diameter under no-tillage than under conventional tillage in the 0?5 cm soil layer. Soil bacterial community structure, based on denaturing gradient gel electrophoresis of polymerase chain reaction amplified DNA (PCR/DGGE) using two different genes as biomarkers, 16S rRNA and rpoB genes, indicated different populations in response to cultivation, tillage and depth, but not due to cover cropping. Soil bacterial community structure and meanweight diameter of soil aggregates indicated alterations in soil conditions due to tillage system. |
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Thesagro: |
Plantio Direto; Solo. |
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Categoria do assunto: |
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Marc: |
LEADER 01848naa a2200229 a 4500
001 1629854
005 2008-04-25
008 2006 bl --- 0-- u #d
100 1 $aPEIXOTO, R. S.
245 $aSoil aggregation and bacterial community structure as affected by tillage and cover cropping in the Brazilian cerrados.
260 $c2006
520 $aMicrobial-based indicators of soil quality are believed to be more dynamic than those based on physical and chemical properties. Recent developments in molecular biology based techniques have led to rapid and reliable tools to characterize microbial community structures. We determined the effects of conventional and no-tillage in cropping systems with and without cover crops on bacterial community structure, total organic carbon (TOC) and soil aggregation. Tillage and rotation did not affect TOC from bulk soil. However, TOC was greater in the largest aggregate size class (7.98?19 mm), and had greater mean-weight diameter under no-tillage than under conventional tillage in the 0?5 cm soil layer. Soil bacterial community structure, based on denaturing gradient gel electrophoresis of polymerase chain reaction amplified DNA (PCR/DGGE) using two different genes as biomarkers, 16S rRNA and rpoB genes, indicated different populations in response to cultivation, tillage and depth, but not due to cover cropping. Soil bacterial community structure and meanweight diameter of soil aggregates indicated alterations in soil conditions due to tillage system.
650 $aPlantio Direto
650 $aSolo
700 1 $aCOUTINHO, H. L. C.
700 1 $aMADARI, B.
700 1 $aMACHADO, P. L. O. A.
700 1 $aRUMJANEK, N. G.
700 1 $aVAN ELSAS, J. D.
700 1 $aSELDIN, L.
700 1 $aROSADO, A. S.
773 $tSoil & Tillage Research, Amsterdam$gv. 90, n. 1-2, p. 16-28, nov. 2006.
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