Registro Completo
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Biblioteca(s): |
Embrapa Arroz e Feijão. |
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Data corrente: |
03/08/2004 |
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Data da última atualização: |
30/03/2022 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
BALBINO, L. C.; BRUAND, A.; BROSSARD, M.; GUIMARÃES, M. de F. |
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Afiliação: |
LUIZ CARLOS BALBINO, CNPAF; ARY BRUAND; MICHEL BROSSARD; MARIA DE FATIMA GUIMARAES, UEL. |
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Título: |
Comportement de la phase argileuse lors de la dessiccation dand des Ferralsols microagrégés du Brésil: rôle de la microstructure et de la matière organique. |
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Ano de publicação: |
2001 |
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Fonte/Imprenta: |
Comptes Rendus de L'Academie des Sciences. Serie I: Sciences de La Terre et des Planètes. Monterouge, n. 332, p. 673-680, 2001. |
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Idioma: |
Francês |
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Conteúdo: |
Behaviour of the clay fraction during desiccation in microaggregated Ferralsols from Brazil: role of microstructure and organic matter. The physical properties of the microaggregates of Ferralsols are still tinder discussion. Two sites were selected for srudy: in each site. one soil under a native savannah (Cerrado) and another one under pasture were studied. Samples were analysed in the laboratory by using scanning electron microscopy and mercury porosimetry and by measuring ths water content at -0.1 and -1.5 MPa potential. Results showed the presence of microaggregates 50 to 300 pm in size and bigger ones 500 to 1O00 pn in size. The latter were often packed in dense volumes 2 to 20 mm in size, which were numerous in the top soil under pasture. These dense volumes are casts and would result from an imbalance in the faunal population as a consequence of deforestation. Results showed also a shrinkage of the clayey phase for drying and this shrinkage increased with the carbon content of the soil. These results showed that microaggregates are not rigid fabrics and the significant role of organic matter in physical properties of the soils studied. c 3001 Académie des sciences I Éditions scientifiques et médicales Elsevier SAS. |
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Palavras-Chave: |
Cast; Microaggregate; Organic carbon; Termite. |
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Thesagro: |
Cerrado. |
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Thesaurus NAL: |
Brazil; clay; shrinkage. |
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Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/233112/1/cras-2001.pdf
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Marc: |
LEADER 02076naa a2200253 a 4500
001 1212450
005 2022-03-30
008 2001 bl uuuu u00u1 u #d
100 1 $aBALBINO, L. C.
245 $aComportement de la phase argileuse lors de la dessiccation dand des Ferralsols microagrégés du Brésil$brôle de la microstructure et de la matière organique.$h[electronic resource]
260 $c2001
520 $aBehaviour of the clay fraction during desiccation in microaggregated Ferralsols from Brazil: role of microstructure and organic matter. The physical properties of the microaggregates of Ferralsols are still tinder discussion. Two sites were selected for srudy: in each site. one soil under a native savannah (Cerrado) and another one under pasture were studied. Samples were analysed in the laboratory by using scanning electron microscopy and mercury porosimetry and by measuring ths water content at -0.1 and -1.5 MPa potential. Results showed the presence of microaggregates 50 to 300 pm in size and bigger ones 500 to 1O00 pn in size. The latter were often packed in dense volumes 2 to 20 mm in size, which were numerous in the top soil under pasture. These dense volumes are casts and would result from an imbalance in the faunal population as a consequence of deforestation. Results showed also a shrinkage of the clayey phase for drying and this shrinkage increased with the carbon content of the soil. These results showed that microaggregates are not rigid fabrics and the significant role of organic matter in physical properties of the soils studied. c 3001 Académie des sciences I Éditions scientifiques et médicales Elsevier SAS.
650 $aBrazil
650 $aclay
650 $ashrinkage
650 $aCerrado
653 $aCast
653 $aMicroaggregate
653 $aOrganic carbon
653 $aTermite
700 1 $aBRUAND, A.
700 1 $aBROSSARD, M.
700 1 $aGUIMARÃES, M. de F.
773 $tComptes Rendus de L'Academie des Sciences. Serie I: Sciences de La Terre et des Planètes. Monterouge$gn. 332, p. 673-680, 2001.
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Embrapa Arroz e Feijão (CNPAF) |
