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 | Acesso ao texto completo restrito à biblioteca da Embrapa Milho e Sorgo. Para informações adicionais entre em contato com cnpms.biblioteca@embrapa.br. |
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Registro Completo |
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Biblioteca(s): |
Embrapa Milho e Sorgo. |
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Data corrente: |
29/12/2001 |
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Data da última atualização: |
07/06/2018 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
ROSCOE, R.; BUURMAN, P.; VELTHORST, E. J.; VASCONCELLOS, C. A. |
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Afiliação: |
EMBRAPA-CNPMS. |
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Título: |
Soil organic matter dynamics in density and particle size fractions as revealed by the 13C/12C isotopic ratio in a cerrado's oxisol. |
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Ano de publicação: |
2001 |
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Fonte/Imprenta: |
Geoderma, Amsterdam, v. 104, p. 185-202, 2001. |
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Idioma: |
Inglês |
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Conteúdo: |
In order to better understand the dynamics of soil organic matter (SOM) in Oxisols and the impact of converting native cerrado (savannah) into pasture, we studied the dynamics of different physically separated SOM pools at different depths in a cerrado oxisol (Typic Haplustox), under natural conditions and after 23 years cultivated pasture (Brachiaria spp.) via the replacement of the native C (C3-derived) by pasture C (C4-derived). Organic C stocks of the original cerrado (15+/- 3 kg m-2) and pasture (17 +/- 3 kg m-2) were not significantly different, which was attributed to the high biomass production of the tropical grasses and the protective effects of the high clay content (> 800 g kg-2). We observed that 89-91% of the total organic C accumulated in the clay + silt fraction. The replacement of cerrado-derived C by pasture-derived C was in average 36%, 34%, and 19% for Ap, AB1, and Bw2 horizons, respectively, suggesting a fast turnover rate of organic C regardless of the high clay content. The replacement decreased in the order: free low-density organic matter (LDOM) > heavy fractions (sand, silt, clay) > occluded-LDOM. The lower replacement of the occluded-LDOM compared to the heavy fractions was attributed to protection inside aggregates and to a possible accumulation of C3-derived charcoal (black carbon). After 23 years of pasture, about 50% of the total organic C in the free-LDOM in the topsoil was still from cerrado, indicating that a significant part of this fraction was relatively recalcitrant. Charcoal fragments observed in the fraction suggested that the recalcitrance was probably due to charred material. MenosIn order to better understand the dynamics of soil organic matter (SOM) in Oxisols and the impact of converting native cerrado (savannah) into pasture, we studied the dynamics of different physically separated SOM pools at different depths in a cerrado oxisol (Typic Haplustox), under natural conditions and after 23 years cultivated pasture (Brachiaria spp.) via the replacement of the native C (C3-derived) by pasture C (C4-derived). Organic C stocks of the original cerrado (15+/- 3 kg m-2) and pasture (17 +/- 3 kg m-2) were not significantly different, which was attributed to the high biomass production of the tropical grasses and the protective effects of the high clay content (> 800 g kg-2). We observed that 89-91% of the total organic C accumulated in the clay + silt fraction. The replacement of cerrado-derived C by pasture-derived C was in average 36%, 34%, and 19% for Ap, AB1, and Bw2 horizons, respectively, suggesting a fast turnover rate of organic C regardless of the high clay content. The replacement decreased in the order: free low-density organic matter (LDOM) > heavy fractions (sand, silt, clay) > occluded-LDOM. The lower replacement of the occluded-LDOM compared to the heavy fractions was attributed to protection inside aggregates and to a possible accumulation of C3-derived charcoal (black carbon). After 23 years of pasture, about 50% of the total organic C in the free-LDOM in the topsoil was still from cerrado, indicating that a significant part of this fractio... Mostrar Tudo |
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Palavras-Chave: |
Carbono organico; Densidade; Factionation; Fragmentacao; Isotop; Organic carbon; Particlesize; Particula; Savanna. |
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Thesagro: |
Cerrado; Isótopo; Matéria Orgânica; Solo; Tamanho. |
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Thesaurus Nal: |
density; organic matter; soil. |
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Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
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Marc: |
LEADER 02624naa a2200361 a 4500
001 1485178
005 2018-06-07
008 2001 bl uuuu u00u1 u #d
100 1 $aROSCOE, R.
245 $aSoil organic matter dynamics in density and particle size fractions as revealed by the 13C/12C isotopic ratio in a cerrado's oxisol.$h[electronic resource]
260 $c2001
520 $aIn order to better understand the dynamics of soil organic matter (SOM) in Oxisols and the impact of converting native cerrado (savannah) into pasture, we studied the dynamics of different physically separated SOM pools at different depths in a cerrado oxisol (Typic Haplustox), under natural conditions and after 23 years cultivated pasture (Brachiaria spp.) via the replacement of the native C (C3-derived) by pasture C (C4-derived). Organic C stocks of the original cerrado (15+/- 3 kg m-2) and pasture (17 +/- 3 kg m-2) were not significantly different, which was attributed to the high biomass production of the tropical grasses and the protective effects of the high clay content (> 800 g kg-2). We observed that 89-91% of the total organic C accumulated in the clay + silt fraction. The replacement of cerrado-derived C by pasture-derived C was in average 36%, 34%, and 19% for Ap, AB1, and Bw2 horizons, respectively, suggesting a fast turnover rate of organic C regardless of the high clay content. The replacement decreased in the order: free low-density organic matter (LDOM) > heavy fractions (sand, silt, clay) > occluded-LDOM. The lower replacement of the occluded-LDOM compared to the heavy fractions was attributed to protection inside aggregates and to a possible accumulation of C3-derived charcoal (black carbon). After 23 years of pasture, about 50% of the total organic C in the free-LDOM in the topsoil was still from cerrado, indicating that a significant part of this fraction was relatively recalcitrant. Charcoal fragments observed in the fraction suggested that the recalcitrance was probably due to charred material.
650 $adensity
650 $aorganic matter
650 $asoil
650 $aCerrado
650 $aIsótopo
650 $aMatéria Orgânica
650 $aSolo
650 $aTamanho
653 $aCarbono organico
653 $aDensidade
653 $aFactionation
653 $aFragmentacao
653 $aIsotop
653 $aOrganic carbon
653 $aParticlesize
653 $aParticula
653 $aSavanna
700 1 $aBUURMAN, P.
700 1 $aVELTHORST, E. J.
700 1 $aVASCONCELLOS, C. A.
773 $tGeoderma, Amsterdam$gv. 104, p. 185-202, 2001.
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Embrapa Milho e Sorgo (CNPMS) |
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| Registros recuperados : 12 | |
| 3. |  | MESCHEDE, D. K.; GAZIERIO, D. L. P.; MELLO, R. A. de. Manejo do de dessecação do capim amargoso (Digitaria insularis) submetido a herbicidas com diferentes mecanismos de ação. In: CONGRESO DE LA ASOCIACIÓN LATINOAMERICANA DE MALEZAS, 21.; CONGRESO MEXICANO DE LA CIENCIA DE LA MALEZA, 34.; SIMPOSIO INTERNACIONAL DE RESISTENCIA Y TOLERANCIA A HERBICIDAS, 4.; SIMPOSIO INTERNACIONAL DE MALEZA ACUÁTICA, 9., 2013, Cancún. [Memoria...]. Cancún: Asociación Latinoamericana de Malezas, 2013. p. 119.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Soja. |
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| 5. | | BRACCINI, A. L.; SCHUAB, S. R. P.; SCAPIM, C. A.; FRANÇA-NETO, J. B.; MESCHEDE, D. K. Avaliação do potencial fisiológico das sementes de soja e sua relação com emergência das plântulas em campo. Informativo ABRATES, Londrina, v. 13, n. 3, p. 312, set. 2003. Número especial, ref. 499. Edição dos Resumos do XIII Congresso Brasileiro de Sementes, Gramado, RS, set. 2003.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Soja. |
|  |
| 6. | | VELINI, E.; ALVES, E.; GODOY, M. C.; MESCHEDE, D. K.; SOUZA, R. T. de; DUKE, S. O. Glyphosate applied at low doses can stimulate plant growth. Pest Management Science, Sussex, v. 64, n. 4, p. 489-496, 2008.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: Internacional - A |
| Biblioteca(s): Embrapa Uva e Vinho. |
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| 7. | | SAMBATTI, V. C.; MESCHEDE, D. K.; DANTAS, G.; AZEVEDO, G.; VANZELLA, L.; DENADAI, J.; GAZZIERO, D. L. P. Manejo de capim-amargoso (digitaria insularis) em áreas com e sem gradagem. In: CONGRESSO BRASILEIRO DE SOJA, 7.; MERCOSOJA, 2015, Florianópolis. Tecnologia e mercado global: perspectivas para soja: anais. Londrina: Embrapa Soja, 2015. 3 p. 1 CD-ROM.| Tipo: Artigo em Anais de Congresso |
| Biblioteca(s): Embrapa Soja. |
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| 8. | | DANTAS, G.; MESCHEDE, D. K.; SAMABATTI, V. C.; AZEVEDO, G.; VANZELLA, L.; DENADAI, J.; GAZZIERO, D. L. P. Roçada como ferramenta no controle do capim amargoso (digitaria insularis) resistente ao glyphosate na cultura da soja. In: CONGRESSO BRASILEIRO DE SOJA, 7.; MERCOSOJA, 2015, Florianópolis. Tecnologia e mercado global: perspectivas para soja: anais. Londrina: Embrapa Soja, 2015. 3 p. 1 CD-ROM.| Tipo: Artigo em Anais de Congresso |
| Biblioteca(s): Embrapa Soja. |
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| 9. | | SCHUAB, S. R.; BRACCINI, A. de L. e.; FRANÇA NETO, J. de B.; SCAPIM, C. A.; MESCHEDE, D, K. Utilização da taxa de crescimento das plântulas na avaliação do vigor de sementes de soja. Revista Brasileira de Sementes, Londrina, v. 24, n. 2, p. 90-95, dez. 2002.| Biblioteca(s): Embrapa Soja. |
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| 10. | | SCHUAB, S. R. P.; BRACCINI, A. L.; FRANÇA NETO, J. B.; SCAPIM, C. A.; MESCHEDE, D. K. Utilização do teste de germinação sob estresse hídrico na avaliação da qualidade das sementes de soja. In: CONGRESSO BRASILEIRO DE SOJA, 2.; MERCOSOJA 2002, 2002, Foz do Iguaçu. Perspectivas do agronegócio da soja: resumos. Londrina: Embrapa Soja, 2002. p. 376. (Embrapa Soja. Documentos, 181). Organizado por Odilon Ferreira Saraiva, Clara Beatriz Hoffmann-Campo.| Biblioteca(s): Embrapa Soja. |
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| 11. | | GAZZIERO, D. L. P.; ADEGAS, F. S.; MESCHEDE, D. K.; VARGAS, L.; KARAM, D.; MACIEL, C. D. de G.; FORNAROLLI, D.; GOMES, M. de M. A era glyphosate. In: MESCHEDE, D. K.; GAZZIERO, D. L. P. A era glyphosate: agricultura, meio ambiente e homem. Londrina: Midiograf II, 2016. Cap. 1, p. 11-21.| Tipo: Capítulo em Livro Técnico-Científico |
| Biblioteca(s): Embrapa Milho e Sorgo; Embrapa Soja; Embrapa Trigo. |
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| 12. | | MESCHEDE, D. K.; MACIEL, C. D. de G.; GAZZIERO, D. L. P.; FORNAROLLI, D. A.; BLAINSKI, E.; GOMES, M. de M. Problemática, aspectos da biologia e manejo de capim-amargoso resistente ao glyphosate: análise de uma rede de pesquisa. In: MESCHEDE, D. K.; GAZZIERO, D. L. P. A era glyphosate: agricultura, meio ambiente e homem. Londrina: Midiograf II, 2016. p. 337-349.| Tipo: Capítulo em Livro Técnico-Científico |
| Biblioteca(s): Embrapa Soja. |
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| Registros recuperados : 12 | |
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| Nenhum registro encontrado para a expressão de busca informada. |
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