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Registro Completo |
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Biblioteca(s): |
Embrapa Arroz e Feijão. |
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Data corrente: |
29/04/2003 |
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Data da última atualização: |
29/04/2022 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
BALBINO, L. C.; BRUAND, A.; BROSSARD, M.; GRIMALDI, M.; HAJNOS, M.; GUIMARAES, M. F. |
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Afiliação: |
LUIZ CARLOS BALBINO, CNPAF. |
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Título: |
Changes in porosity and microaggregation in clayey Ferralsols of the Brazilian Cerrado on clearing for pasture. |
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Ano de publicação: |
2002 |
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Fonte/Imprenta: |
European Journal of Soil Science, v. 53, n. 2, p. 219-230, June 2002. |
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Idioma: |
Inglês |
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Conteúdo: |
Ferrasols have a macrostructure that is weak to moderate and a strong microstructure consisting of near spherical microaggregates. We have studied the evolution of the structure under changing land use in two Ferralsols under a native Cerrado and under pasture after recent clearing by measuring bulk density. We studied the microaggregates characteristics and resulting porosity using scanning electron microscopy and mercury porosimetry, respectively. Microaggregates 50-300 um in diameter are attributed to termites. They were in a much closer arrangement from the surface to 1 m depth under pasture than under Cerrado. Larger microaggregates, 500-1000 um in diameter, that are closely packed, resulted from earthworm activity. They were more numerous under pasture than under Cerrado. Thus within a few years, clearing and grazing have caused a dramatic decrease in microstructure that is one of the rare favourable characteristics of Ferralsols of agriculture. This evolution that affects the subsoil to 80-90 cm cannot be attributed to compaction by mechanical deforestation alone but seems to result from a change in the faunal activity in the faunal activity in the soil. Finally, the packing of the clay particles within the microaggregates was similar whatever the type microaggregate and land use. Our results accord with ealier studies showing that the porosity resulting from clay packing varies little in Ferralsols in which the fine material is mainly kaolinite. |
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Palavras-Chave: |
Densidade; Pasto; Pasture. |
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Thesagro: |
Cerrado; Pastagem; Solo. |
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Thesaurus Nal: |
Ferralsols. |
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Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
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Marc: |
LEADER 02219naa a2200265 a 4500
001 1210819
005 2022-04-29
008 2002 bl uuuu u00u1 u #d
100 1 $aBALBINO, L. C.
245 $aChanges in porosity and microaggregation in clayey Ferralsols of the Brazilian Cerrado on clearing for pasture.$h[electronic resource]
260 $c2002
520 $aFerrasols have a macrostructure that is weak to moderate and a strong microstructure consisting of near spherical microaggregates. We have studied the evolution of the structure under changing land use in two Ferralsols under a native Cerrado and under pasture after recent clearing by measuring bulk density. We studied the microaggregates characteristics and resulting porosity using scanning electron microscopy and mercury porosimetry, respectively. Microaggregates 50-300 um in diameter are attributed to termites. They were in a much closer arrangement from the surface to 1 m depth under pasture than under Cerrado. Larger microaggregates, 500-1000 um in diameter, that are closely packed, resulted from earthworm activity. They were more numerous under pasture than under Cerrado. Thus within a few years, clearing and grazing have caused a dramatic decrease in microstructure that is one of the rare favourable characteristics of Ferralsols of agriculture. This evolution that affects the subsoil to 80-90 cm cannot be attributed to compaction by mechanical deforestation alone but seems to result from a change in the faunal activity in the faunal activity in the soil. Finally, the packing of the clay particles within the microaggregates was similar whatever the type microaggregate and land use. Our results accord with ealier studies showing that the porosity resulting from clay packing varies little in Ferralsols in which the fine material is mainly kaolinite.
650 $aFerralsols
650 $aCerrado
650 $aPastagem
650 $aSolo
653 $aDensidade
653 $aPasto
653 $aPasture
700 1 $aBRUAND, A.
700 1 $aBROSSARD, M.
700 1 $aGRIMALDI, M.
700 1 $aHAJNOS, M.
700 1 $aGUIMARAES, M. F.
773 $tEuropean Journal of Soil Science$gv. 53, n. 2, p. 219-230, June 2002.
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Registro original: |
Embrapa Arroz e Feijão (CNPAF) |
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Registro Completo
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Biblioteca(s): |
Embrapa Instrumentação. |
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Data corrente: |
23/08/2013 |
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Data da última atualização: |
13/12/2018 |
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Tipo da produção científica: |
Artigo em Anais de Congresso |
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Autoria: |
LACERDA, L. H. da S.; LAZARO, S. R. de; RIBEIRO, R. A. P.; OLIVEIRA, C. R. de. |
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Afiliação: |
CAUE RIBEIRO DE OLIVEIRA, CNPDIA. |
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Título: |
Simulação da estrutura cristalina do material ZnO:N. |
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Ano de publicação: |
2013 |
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Fonte/Imprenta: |
In: WORKSHOP DA REDE DE NANOTECNOLOGIA APLICADA AO AGRONEGÓCIO, 7.; ESCOLA DE NANOTECNOLOGIA, 3., 2013, São Carlos, SP. Anais... São Carlos, SP: Embrapa Instrumentação, 2013. p. 425-427 Editores: Maria Alice Martins, Odílio Benedito Garrido de Assis, Caue Ribeiro, Luiz Henrique Capparelli Mattoso. CD-ROM. Editores: Maria Alice Martins, Odílio Benedito Garrido de Assis, Caue Ribeiro, Luiz Henrique Capparelli Mattoso. |
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ISSN: |
2175-8395 |
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Idioma: |
Português |
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Palavras-Chave: |
Células solares; Despoluição de água; Dopagem; Propriedades elétricas; Semicondutores; Wurtzita. |
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Thesagro: |
Simulação. |
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Categoria do assunto: |
-- |
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URL: |
https://www.alice.cnptia.embrapa.br/alice/bitstream/doc/964638/1/Proci13.00092.pdf
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Marc: |
LEADER 01051nam a2200229 a 4500
001 1964638
005 2018-12-13
008 2013 bl uuuu u00u1 u #d
022 $a2175-8395
100 1 $aLACERDA, L. H. da S.
245 $aSimulação da estrutura cristalina do material ZnO$bN.$h[electronic resource]
260 $aIn: WORKSHOP DA REDE DE NANOTECNOLOGIA APLICADA AO AGRONEGÓCIO, 7.; ESCOLA DE NANOTECNOLOGIA, 3., 2013, São Carlos, SP. Anais... São Carlos, SP: Embrapa Instrumentação, 2013. p. 425-427 Editores: Maria Alice Martins, Odílio Benedito Garrido de Assis, Caue Ribeiro, Luiz Henrique Capparelli Mattoso. CD-ROM. Editores: Maria Alice Martins, Odílio Benedito Garrido de Assis, Caue Ribeiro, Luiz Henrique Capparelli Mattoso.$c2013
650 $aSimulação
653 $aCélulas solares
653 $aDespoluição de água
653 $aDopagem
653 $aPropriedades elétricas
653 $aSemicondutores
653 $aWurtzita
700 1 $aLAZARO, S. R. de
700 1 $aRIBEIRO, R. A. P.
700 1 $aOLIVEIRA, C. R. de
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