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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. |
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Registro Completo |
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Biblioteca(s): |
Embrapa Agrobiologia. |
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Data corrente: |
25/10/2007 |
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Data da última atualização: |
18/03/2015 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
ZOTARELLI, L.; ALVES, B. J. R.; URQUIAGA, S.; BODDEY, R. M.; SIX, J. |
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Afiliação: |
Lincoln Zotarelli, UFRRJ; Bruno José Rodrigues Alves, Embrapa Agrobiologia; Segundo Urquiaga, Embrapa Agrobiologia; Robert Michael Boddey, Embrapa Agrobiologia; Joerg Six, University of California. |
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Título: |
Impact of tillage and crop rotation on light fraction and intra-aggregate soil organic matter in two oxisols. |
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Ano de publicação: |
2007 |
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Fonte/Imprenta: |
Soil & Tillage Research, Amsterdam, v. 95, n. 1-2, p. 196-206, sept. 2007. |
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Idioma: |
Inglês |
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Notas: |
Parceria: Colorado State University, UFRRJ, University of California. |
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Conteúdo: |
It is well known that no-tillage (NT) practices can promote greater stocks of soil organic matter (SOM) in the soil surface layer compared to conventional tillage (CT) by enhancing the physical protection of aggregate-associated C in temperate soils. However, this link between tillage, aggregation and SOM is less well established for tropical soils, such as Oxisols. The objective of this study was to investigate the underlying mechanisms of SOM stabilization in Oxisols as affected by different crop rotations and tillage regimes at two sites in southern Brazil. Soils were sampled from two agricultural experiment sites (Passo Fundo and Londrina) in southern Brazil, with treatments comparing different crop rotations under NT and CT management, and a reference soil under native vegetation (NV). Free light fraction (LF) and intra-aggregate particulate organic matter (iPOM) were isolated from slaking-resistant aggregates. Of the total C associated with aggregates, 79?90% was found in the mineral fraction, but there were no differences between NT and CT. In contrast, tillage drastically decreased LF-C concentrations in the 0?5 cm depth layer at both sites. In the same depth layer of NT systems at Londrina, the concentrations of iPOM-C were greater when a legume cover crop was included in the rotation. At Londrina, the order of total iPOM-C levels was generally NV > NT > CT in the 0?5 cm depth interval, but the difference between NT and CT was much less than in Passo Fundo. At Passo Fundo, the greatest concentrations and differences in concentrations across tillage treatments were found in the fine (53?250 ?m) iPOM fractions occluded within microaggregates. In conclusion, even though no aggregate hierarchy exists in these Oxisols, our results corroborate the concept of a stabilization of POM-C within microaggregates in no-tillage systems, especially when green manures are included in the rotation. MenosIt is well known that no-tillage (NT) practices can promote greater stocks of soil organic matter (SOM) in the soil surface layer compared to conventional tillage (CT) by enhancing the physical protection of aggregate-associated C in temperate soils. However, this link between tillage, aggregation and SOM is less well established for tropical soils, such as Oxisols. The objective of this study was to investigate the underlying mechanisms of SOM stabilization in Oxisols as affected by different crop rotations and tillage regimes at two sites in southern Brazil. Soils were sampled from two agricultural experiment sites (Passo Fundo and Londrina) in southern Brazil, with treatments comparing different crop rotations under NT and CT management, and a reference soil under native vegetation (NV). Free light fraction (LF) and intra-aggregate particulate organic matter (iPOM) were isolated from slaking-resistant aggregates. Of the total C associated with aggregates, 79?90% was found in the mineral fraction, but there were no differences between NT and CT. In contrast, tillage drastically decreased LF-C concentrations in the 0?5 cm depth layer at both sites. In the same depth layer of NT systems at Londrina, the concentrations of iPOM-C were greater when a legume cover crop was included in the rotation. At Londrina, the order of total iPOM-C levels was generally NV > NT > CT in the 0?5 cm depth interval, but the difference between NT and CT was much less than in Passo Fundo. At Passo... Mostrar Tudo |
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Palavras-Chave: |
Agregado do solo; Matéria orgânica do solo; Oxissolo; Rotação de culturas. |
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Thesaurus Nal: |
crop rotation; Oxisols; soil aggregates; soil organic matter. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02795naa a2200277 a 4500
001 1629549
005 2015-03-18
008 2007 bl uuuu u00u1 u #d
100 1 $aZOTARELLI, L.
245 $aImpact of tillage and crop rotation on light fraction and intra-aggregate soil organic matter in two oxisols.
260 $c2007
500 $aParceria: Colorado State University, UFRRJ, University of California.
520 $aIt is well known that no-tillage (NT) practices can promote greater stocks of soil organic matter (SOM) in the soil surface layer compared to conventional tillage (CT) by enhancing the physical protection of aggregate-associated C in temperate soils. However, this link between tillage, aggregation and SOM is less well established for tropical soils, such as Oxisols. The objective of this study was to investigate the underlying mechanisms of SOM stabilization in Oxisols as affected by different crop rotations and tillage regimes at two sites in southern Brazil. Soils were sampled from two agricultural experiment sites (Passo Fundo and Londrina) in southern Brazil, with treatments comparing different crop rotations under NT and CT management, and a reference soil under native vegetation (NV). Free light fraction (LF) and intra-aggregate particulate organic matter (iPOM) were isolated from slaking-resistant aggregates. Of the total C associated with aggregates, 79?90% was found in the mineral fraction, but there were no differences between NT and CT. In contrast, tillage drastically decreased LF-C concentrations in the 0?5 cm depth layer at both sites. In the same depth layer of NT systems at Londrina, the concentrations of iPOM-C were greater when a legume cover crop was included in the rotation. At Londrina, the order of total iPOM-C levels was generally NV > NT > CT in the 0?5 cm depth interval, but the difference between NT and CT was much less than in Passo Fundo. At Passo Fundo, the greatest concentrations and differences in concentrations across tillage treatments were found in the fine (53?250 ?m) iPOM fractions occluded within microaggregates. In conclusion, even though no aggregate hierarchy exists in these Oxisols, our results corroborate the concept of a stabilization of POM-C within microaggregates in no-tillage systems, especially when green manures are included in the rotation.
650 $acrop rotation
650 $aOxisols
650 $asoil aggregates
650 $asoil organic matter
653 $aAgregado do solo
653 $aMatéria orgânica do solo
653 $aOxissolo
653 $aRotação de culturas
700 1 $aALVES, B. J. R.
700 1 $aURQUIAGA, S.
700 1 $aBODDEY, R. M.
700 1 $aSIX, J.
773 $tSoil & Tillage Research, Amsterdam$gv. 95, n. 1-2, p. 196-206, sept. 2007.
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Registro original: |
Embrapa Agrobiologia (CNPAB) |
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| Registros recuperados : 5 | |
| 1. |  | SANTOS, V. C. dos; THOMAZINI, M. J. Abundância das principais espécies de moscas-brancas em culturas de importância agrícola no sudeste acreano. In: SEMINÁRIO DE INICIAÇÃO CIENTÍFICA PIBIC/CNPQ/UFAC/EMBRAPA, 15.; MOSTRA DE PESQUISA E PÓS-GRADUAÇÃO, 5., 2006, Rio Branco, AC. Novos rumos, novos caminhos na ciência, tecnologia & inovação: anais. Rio Branco, AC: Ufac, 2006. 1 p. 1 CD-ROM.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Acre. |
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| 2. | | COSTA, G. A. da; SANTOS, V. C. dos; SCHULTZ, E. L.; SOARES, I. P. Reforma a vapor do biogás usando catalisadores de óxidos mistos Ni/Mg-La para produção de gás de síntese. In: ENCONTRO DE PESQUISA E INOVAÇÃO DA EMBRAPA AGROENERGIA, 4.,2017, Brasília, DF. Anais... Brasília, DF: Embrapa, 2017. p. 115-120.| Tipo: Artigo em Anais de Congresso |
| Biblioteca(s): Embrapa Agroenergia. |
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| 3. | | SANTOS, V. C. dos; SAMPAIO, B. L.; COSTA, G. A. da; SCHULTZ, E. L.; SOARES, I. P. Uso de catalisadores multifuncionais à base de Ni e Mo para a produção de diesel verde pelo processo de hidrodesoxigenação a partir de materiais residuais da produção de biodiesel. In: ENCONTRO DE PESQUISA E INOVAÇÃO DA EMBRAPA AGROENERGIA, 4.,2017, Brasília, DF. Anais... Brasília, DF: Embrapa, 2017. p. 148-153.| Tipo: Artigo em Anais de Congresso |
| Biblioteca(s): Embrapa Agroenergia. |
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| 4. | | HAJI, F. N. P.; MOREIRA, A. N.; ALENCAR, J. A. de; MOREIRA, F. R. B.; LEITE, E. M.; COSTA, T. A. S.; FERREIRA, R. C. F.; LOPES, L. M. da M.; SANTOS, C. A. P. dos; SANTOS, V. C. dos. Monitoramento das pragas da videira no contexto da produção integrada de frutas. In: SEMANA INTERNACIONAL DA FRUTICULTURA, FLORICULTURA E AGROINDÚSTRIA. 9.,; SIMPÓSIO DE INOVAÇÕES TECNOLÓGICAS E GERENCIAIS, 2., 2002, Fortaleza. Frutal 2002. Fortaleza : Embrapa Agroindústria Tropical; Instituto Frutal; SINDIFRUTA, 2002. CD-ROM.| Tipo: Artigo em Anais de Congresso |
| Biblioteca(s): Embrapa Semiárido. |
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| 5. | | HAJI, F. N. P.; COSTA, V. S. de O.; LOPES, P. R. C.; MOREIRA, A. N.; SANTOS, V. C. dos; SANTOS, C. A. P. dos; ALENCAR, J. A. de; BARBOSA, F. R. A produção integrada de uvas finas de mesa, no Submédio do Vale do São Francisco. In: SEMINÁRIO BRASILEIRO SOBRE PRODUÇÃO INTEGRADA DE FRUTAS, 5., 2003, Bento Gonçalves. Anais... Bento Gonçalves: Embrapa Uva e Vinho, 2003. p. 103. (Embrapa Uva e Vinho. Documentos, 39).| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Semiárido. |
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| Registros recuperados : 5 | |
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