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Registro Completo |
Biblioteca(s): |
Embrapa Arroz e Feijão. |
Data corrente: |
29/04/2003 |
Data da última atualização: |
29/04/2022 |
Tipo da produção científica: |
Artigo em Periódico Indexado |
Autoria: |
BALBINO, L. C.; BRUAND, A.; BROSSARD, M.; GRIMALDI, M.; HAJNOS, M.; GUIMARAES, M. F. |
Afiliação: |
LUIZ CARLOS BALBINO, CNPAF. |
Título: |
Changes in porosity and microaggregation in clayey Ferralsols of the Brazilian Cerrado on clearing for pasture. |
Ano de publicação: |
2002 |
Fonte/Imprenta: |
European Journal of Soil Science, v. 53, n. 2, p. 219-230, June 2002. |
Idioma: |
Inglês |
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. |
Palavras-Chave: |
Densidade; Pasto; Pasture. |
Thesagro: |
Cerrado; Pastagem; Solo. |
Thesaurus Nal: |
Ferralsols. |
Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
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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Embrapa Arroz e Feijão (CNPAF) |
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| Acesso ao texto completo restrito à biblioteca da Embrapa Florestas. Para informações adicionais entre em contato com cnpf.biblioteca@embrapa.br. |
Registro Completo
Biblioteca(s): |
Embrapa Florestas. |
Data corrente: |
22/09/2004 |
Data da última atualização: |
22/09/2004 |
Autoria: |
SANTOS, A. F. dos. |
Afiliação: |
SANTOS, Pesquisdador da Embrapa Florestas. |
Título: |
Pesquisas visando o manejo integrado de doenças da acácia-negra. |
Ano de publicação: |
2003 |
Fonte/Imprenta: |
Fitopatologia Brasileira, Brasília, v. 28, supl., p. 164-166, ago. 2003. |
Idioma: |
Português |
Thesagro: |
Acácia Mearnsii; Acácia Negra; Gomose; Phytophthora. |
Categoria do assunto: |
-- |
Marc: |
LEADER 00465naa a2200157 a 4500 001 1309530 005 2004-09-22 008 2003 bl --- 0-- u #d 100 1 $aSANTOS, A. F. dos 245 $aPesquisas visando o manejo integrado de doenças da acácia-negra. 260 $c2003 650 $aAcácia Mearnsii 650 $aAcácia Negra 650 $aGomose 650 $aPhytophthora 773 $tFitopatologia Brasileira, Brasília$gv. 28, supl., p. 164-166, ago. 2003.
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