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 | Acesso ao texto completo restrito à biblioteca da Embrapa Arroz e Feijão. Para informações adicionais entre em contato com cnpaf.biblioteca@embrapa.br. |
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Registro Completo |
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Biblioteca(s): |
Embrapa Arroz e Feijão. |
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Data corrente: |
21/05/2004 |
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Data da última atualização: |
01/06/2022 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
BALBINO, L. C.; BRUAND, A.; COUSIN, I.; BROSSARD, M.; QUÉTIN, P.; GRIMALDI, M. |
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Afiliação: |
LUIZ CARLOS BALBINO, CNPAF. |
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Título: |
Change in the hydraulic properties of a Brazilian clay ferralsol on clearing for pasture. |
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Ano de publicação: |
2004 |
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Fonte/Imprenta: |
Geoderma, v. 120, n. 3/4, p. 297-307, June 2004. |
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ISSN: |
0016-7061 |
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DOI: |
10.1016/j.geoderma.2003.08.017 |
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Idioma: |
Inglês |
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Conteúdo: |
Ferralsols under native vegetation have a weak to moderate macrostructure and a well-developed microstructure corresponding to subrounded microaggregates that are usually 80 to 300 um in size. The aim of this study was to analyze how the hydraulic properties of a clay Ferralsol were affected by a change of structure when the native vegetation is cleared for pasture. We studied the macrostructure in the field and microstructure in scanning electron microscopy. The water retention properties were determined by using pressure cell equipment. We determined the saturated hydraulic conductivity, Ks, by applying a constant hydraulic head to saturated core samples, and the unsaturated hydraulic conductivity, Ks, by applying the evaporation method to undisturbed core samples. Results showed a significant decrease in the water retained at --1 and --10 hPa from 0- to 40-cm-depth when the native vegetation is cleared for pasture. That decrease in the water retained was related to a smaller development of microaggregation and greater proportion of microaggregates in close packing. For smaller water potential, there was no difference of water retained at every depth between native vegetation and pasture. Pedotransfer functions established earlier for Brazilian Ferralsols and using clay content as single predictor gave pretty good results but the precision of the estimation decreased when the water potential increased. This decrease in the precision was related to the lack of predictor taking structure into account. Ks and K(Y) showed an upward trend with depth under native vegetation and pasture. Except at 0?7-cm depth between the Brachiaria clumps in the pasture where smaller Ks and K(Y) than at the other depth was recorded whatever land use, we did not record any significant difference of Ks and K(Y) at every depth between native vegetation and pasture. The upward trend shown by the hydraulic conductivity with depth was related to the increase in the development of microaggregation with depth. MenosFerralsols under native vegetation have a weak to moderate macrostructure and a well-developed microstructure corresponding to subrounded microaggregates that are usually 80 to 300 um in size. The aim of this study was to analyze how the hydraulic properties of a clay Ferralsol were affected by a change of structure when the native vegetation is cleared for pasture. We studied the macrostructure in the field and microstructure in scanning electron microscopy. The water retention properties were determined by using pressure cell equipment. We determined the saturated hydraulic conductivity, Ks, by applying a constant hydraulic head to saturated core samples, and the unsaturated hydraulic conductivity, Ks, by applying the evaporation method to undisturbed core samples. Results showed a significant decrease in the water retained at --1 and --10 hPa from 0- to 40-cm-depth when the native vegetation is cleared for pasture. That decrease in the water retained was related to a smaller development of microaggregation and greater proportion of microaggregates in close packing. For smaller water potential, there was no difference of water retained at every depth between native vegetation and pasture. Pedotransfer functions established earlier for Brazilian Ferralsols and using clay content as single predictor gave pretty good results but the precision of the estimation decreased when the water potential increased. This decrease in the precision was related to the lack of predictor tak... Mostrar Tudo |
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Palavras-Chave: |
Microaggregate; Pedotransfer function; Water retention. |
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Thesagro: |
Argila; Condutividade Hidráulica. |
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Thesaurus Nal: |
bulk density; hydraulic conductivity. |
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Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
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Marc: |
LEADER 02853naa a2200289 a 4500
001 1212341
005 2022-06-01
008 2004 bl uuuu u00u1 u #d
022 $a0016-7061
024 7 $a10.1016/j.geoderma.2003.08.017$2DOI
100 1 $aBALBINO, L. C.
245 $aChange in the hydraulic properties of a Brazilian clay ferralsol on clearing for pasture.$h[electronic resource]
260 $c2004
520 $aFerralsols under native vegetation have a weak to moderate macrostructure and a well-developed microstructure corresponding to subrounded microaggregates that are usually 80 to 300 um in size. The aim of this study was to analyze how the hydraulic properties of a clay Ferralsol were affected by a change of structure when the native vegetation is cleared for pasture. We studied the macrostructure in the field and microstructure in scanning electron microscopy. The water retention properties were determined by using pressure cell equipment. We determined the saturated hydraulic conductivity, Ks, by applying a constant hydraulic head to saturated core samples, and the unsaturated hydraulic conductivity, Ks, by applying the evaporation method to undisturbed core samples. Results showed a significant decrease in the water retained at --1 and --10 hPa from 0- to 40-cm-depth when the native vegetation is cleared for pasture. That decrease in the water retained was related to a smaller development of microaggregation and greater proportion of microaggregates in close packing. For smaller water potential, there was no difference of water retained at every depth between native vegetation and pasture. Pedotransfer functions established earlier for Brazilian Ferralsols and using clay content as single predictor gave pretty good results but the precision of the estimation decreased when the water potential increased. This decrease in the precision was related to the lack of predictor taking structure into account. Ks and K(Y) showed an upward trend with depth under native vegetation and pasture. Except at 0?7-cm depth between the Brachiaria clumps in the pasture where smaller Ks and K(Y) than at the other depth was recorded whatever land use, we did not record any significant difference of Ks and K(Y) at every depth between native vegetation and pasture. The upward trend shown by the hydraulic conductivity with depth was related to the increase in the development of microaggregation with depth.
650 $abulk density
650 $ahydraulic conductivity
650 $aArgila
650 $aCondutividade Hidráulica
653 $aMicroaggregate
653 $aPedotransfer function
653 $aWater retention
700 1 $aBRUAND, A.
700 1 $aCOUSIN, I.
700 1 $aBROSSARD, M.
700 1 $aQUÉTIN, P.
700 1 $aGRIMALDI, M.
773 $tGeoderma$gv. 120, n. 3/4, p. 297-307, June 2004.
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Registro original: |
Embrapa Arroz e Feijão (CNPAF) |
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Registro Completo
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Biblioteca(s): |
Embrapa Agroindústria Tropical. |
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Data corrente: |
23/11/2015 |
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Data da última atualização: |
04/03/2016 |
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Tipo da produção científica: |
Resumo em Anais de Congresso |
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Autoria: |
MENDONÇA, J. F. M. de; VIEIRA, F. de O.; FONSECA, I.; ARCURI, E. F.; RIBEIRO, J. B.; BORGES, M. de F.; MARTINS, M. F. |
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Afiliação: |
JULIANA FRANÇA MONTEIRO de MENDONÇA, UNIVERSIDADE FEDERAL DE JUIZ DE FORA, mestranda; FELIPE de OLIVEIRA VIEIRA, Centro de Ensino Superior Juiz de Fora, Bolsista CNPq; ISABELA FONSECA, Pós-doutorado - Bolsista CNPq; EDNA FROEDER ARCURI, CNPGL; JOAO BATISTA RIBEIRO, CNPGL; MARIA DE FATIMA BORGES, CNPAT; MARTA FONSECA MARTINS, CNPGL. |
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Título: |
Detecção de células viáveis de patógenos em queijo Minas Padrão pela técnica de PCR em Tempo Real. |
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Ano de publicação: |
2015 |
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Fonte/Imprenta: |
In: CONGRESSO INTERNACIONAL DO LEITE, 13., 2015, Porto Alegre. Anais... Juiz de Fora: Embrapa Gado de Leite, 2015. |
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Páginas: |
1 CD-ROM. |
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Idioma: |
Português |
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Palavras-Chave: |
Derivados lácteos; Micro-organismos patogênicos; QPCR; Viabilidade. |
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Thesagro: |
Ema. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/133729/1/RES15037.pdf
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Marc: |
LEADER 00798nam a2200241 a 4500
001 2029283
005 2016-03-04
008 2015 bl uuuu u00u1 u #d
100 1 $aMENDONÇA, J. F. M. de
245 $aDetecção de células viáveis de patógenos em queijo Minas Padrão pela técnica de PCR em Tempo Real.$h[electronic resource]
260 $aIn: CONGRESSO INTERNACIONAL DO LEITE, 13., 2015, Porto Alegre. Anais... Juiz de Fora: Embrapa Gado de Leite$c2015
300 $a1 CD-ROM.
650 $aEma
653 $aDerivados lácteos
653 $aMicro-organismos patogênicos
653 $aQPCR
653 $aViabilidade
700 1 $aVIEIRA, F. de O.
700 1 $aFONSECA, I.
700 1 $aARCURI, E. F.
700 1 $aRIBEIRO, J. B.
700 1 $aBORGES, M. de F.
700 1 $aMARTINS, M. F.
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Embrapa Agroindústria Tropical (CNPAT) |
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