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Registro Completo |
Biblioteca(s): |
Embrapa Cerrados; Embrapa Solos. |
Data corrente: |
11/02/1993 |
Data da última atualização: |
20/09/2016 |
Autoria: |
MACEDO, J. |
Afiliação: |
JAMIL MACEDO, CPAC. |
Título: |
Morphology, mineralogy, and genesis of a hydrosequence of oxisols in Brazil. |
Ano de publicação: |
1986 |
Fonte/Imprenta: |
1986. |
Páginas: |
73 p. |
Idioma: |
Inglês |
Notas: |
Thesis (Master of Science) -- Cornell University, Ithaca. |
Conteúdo: |
Research was conducted to establish the genetic relationship between soil color patterns and natural drainage characteristics in a hydrosequence of Oxisols formed in Tertiary/Quaternary sediments of the Cerrado (Savanna) Region in the Central Plateau of Brazil. The soils classify as Acrustoxs and Pilinthaquoxs in Soil Taxonomy and as Dark-Red Latosols, Red-Yellow Latosols, and Hydromorphic Laterite in the Brazilian classification scheme. In addition to standard soil classification analyses, x-ray diffraction and sodium citrate-bicarbonate-dithionite extractions were used to determine soil mineralogy. Precipitation was recorded and weekly positions of the water table at sampling sites were measured in observation wells for a period of one year. Kaolinite, gibbsite, quartz and iron oxides are the dominat minerals in all sites. Relative amounts of theses minerals show similar desilication trends with depth at all sites in the hydrosequence. Well drained soils with water tables below 3 meters had reddish hues (2.5 YR or 5 YR) reflecting and oxidizing environment and a co-dominant hematite and goethite iron mineralogy. The upper organic rich solum in sites with seasonally high water tables (<2m) had yellowish hues (10 YR or 7.5 YR) and dominantly goethitic iron mineralogy. In the deeper perennially saturated zones of all profiles the matrix color has reddish hues (2.5 YR or 10R) and a dominantly hematitic iron mineralogy. Stratigraphic, geomorphic, and pedogenic evidence supports the hypothesis that the observed soil colors and corresponding differences in iron mineralogy are a pedogenic adjustment to change in the hydrology of these soils brought about by landscape evolution. MenosResearch was conducted to establish the genetic relationship between soil color patterns and natural drainage characteristics in a hydrosequence of Oxisols formed in Tertiary/Quaternary sediments of the Cerrado (Savanna) Region in the Central Plateau of Brazil. The soils classify as Acrustoxs and Pilinthaquoxs in Soil Taxonomy and as Dark-Red Latosols, Red-Yellow Latosols, and Hydromorphic Laterite in the Brazilian classification scheme. In addition to standard soil classification analyses, x-ray diffraction and sodium citrate-bicarbonate-dithionite extractions were used to determine soil mineralogy. Precipitation was recorded and weekly positions of the water table at sampling sites were measured in observation wells for a period of one year. Kaolinite, gibbsite, quartz and iron oxides are the dominat minerals in all sites. Relative amounts of theses minerals show similar desilication trends with depth at all sites in the hydrosequence. Well drained soils with water tables below 3 meters had reddish hues (2.5 YR or 5 YR) reflecting and oxidizing environment and a co-dominant hematite and goethite iron mineralogy. The upper organic rich solum in sites with seasonally high water tables (<2m) had yellowish hues (10 YR or 7.5 YR) and dominantly goethitic iron mineralogy. In the deeper perennially saturated zones of all profiles the matrix color has reddish hues (2.5 YR or 10R) and a dominantly hematitic iron mineralogy. Stratigraphic, geomorphic, and pedogenic evidence supports... Mostrar Tudo |
Palavras-Chave: |
Brasil; Dark-red latosol; Distrito Federal; Latossolo vermelho-amarelo; Latossolo vermelho-escuro; Morfologia do solo; Oxisolo; Planaltina; Red-yellow latossol; Soil genesis. |
Thesagro: |
Cerrado; Gênese do Solo; Mineralogia; Solo. |
Thesaurus Nal: |
Brazil; Ferralsols; mineralogy; soil morphological features; soil sequences. |
Categoria do assunto: |
-- P Recursos Naturais, Ciências Ambientais e da Terra |
Marc: |
LEADER 02667nam a2200361 a 4500 001 1547884 005 2016-09-20 008 1986 bl uuuu m 00u1 u #d 100 1 $aMACEDO, J. 245 $aMorphology, mineralogy, and genesis of a hydrosequence of oxisols in Brazil. 260 $a1986.$c1986 300 $a73 p. 500 $aThesis (Master of Science) -- Cornell University, Ithaca. 520 $aResearch was conducted to establish the genetic relationship between soil color patterns and natural drainage characteristics in a hydrosequence of Oxisols formed in Tertiary/Quaternary sediments of the Cerrado (Savanna) Region in the Central Plateau of Brazil. The soils classify as Acrustoxs and Pilinthaquoxs in Soil Taxonomy and as Dark-Red Latosols, Red-Yellow Latosols, and Hydromorphic Laterite in the Brazilian classification scheme. In addition to standard soil classification analyses, x-ray diffraction and sodium citrate-bicarbonate-dithionite extractions were used to determine soil mineralogy. Precipitation was recorded and weekly positions of the water table at sampling sites were measured in observation wells for a period of one year. Kaolinite, gibbsite, quartz and iron oxides are the dominat minerals in all sites. Relative amounts of theses minerals show similar desilication trends with depth at all sites in the hydrosequence. Well drained soils with water tables below 3 meters had reddish hues (2.5 YR or 5 YR) reflecting and oxidizing environment and a co-dominant hematite and goethite iron mineralogy. The upper organic rich solum in sites with seasonally high water tables (<2m) had yellowish hues (10 YR or 7.5 YR) and dominantly goethitic iron mineralogy. In the deeper perennially saturated zones of all profiles the matrix color has reddish hues (2.5 YR or 10R) and a dominantly hematitic iron mineralogy. Stratigraphic, geomorphic, and pedogenic evidence supports the hypothesis that the observed soil colors and corresponding differences in iron mineralogy are a pedogenic adjustment to change in the hydrology of these soils brought about by landscape evolution. 650 $aBrazil 650 $aFerralsols 650 $amineralogy 650 $asoil morphological features 650 $asoil sequences 650 $aCerrado 650 $aGênese do Solo 650 $aMineralogia 650 $aSolo 653 $aBrasil 653 $aDark-red latosol 653 $aDistrito Federal 653 $aLatossolo vermelho-amarelo 653 $aLatossolo vermelho-escuro 653 $aMorfologia do solo 653 $aOxisolo 653 $aPlanaltina 653 $aRed-yellow latossol 653 $aSoil genesis
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Registro original: |
Embrapa Cerrados (CPAC) |
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Registros recuperados : 477 | |
1. | | MACEDO, J. The Brazilian cerrados. In: INTERNATIONAL WORKSHOP ON SOIL, WATER, AND NUTRIENT MANAGEMENT RESEARCH: environmental and productivity dimensions, 1994, Zschortau, Germany. Proceedings: the Zschortau plan for the implementation of soil, water, and nutrient ... . Zchortau: DSE/Bangkok: IBSRAM, 1995. p.78-86.Biblioteca(s): Embrapa Cerrados. |
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2. | | MACEDO, J. Produção de alimentos: o potencial dos cerrados. Planaltina, DF: EMBRAPA-CPAC, 1996. 33 p. (EMBRAPA-CPAC. Documentos, 59). Apresentado no "Workshop de Ecologia e Biodiversidade", com o titulo "Prospectives for the rational use of the Brazilian's Cerrados for food production", Rio de Janeiro, 1994 (CRI4028). Ver CRI3752.Biblioteca(s): Embrapa Cerrados. |
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8. | | MACEDO, J. Os solos da regiao dos cerrados. In: ALVAREZ V., V.H.; FONTES, L.E.F.; FONTES, M.P.F. (Ed.). O solo nos grandes dominios morfoclimaticos do Brasil e o desenvolvimento sustentado. Vicosa: SBCS/UFV, 1996. p.135-155.Biblioteca(s): Embrapa Cerrados. |
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11. | | MACEDO, J. R. de. Erosão em pastagens. Portal Dia de Campo, 18 ago. 2010. Disponível em : < http://www.diadecampo.com.br>. Acesso em: 09 fev. 2011.Tipo: Artigo de Divulgação na Mídia |
Biblioteca(s): Embrapa Solos. |
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15. | | MACEDO, J. L. V. de. Cultivo de fruteiras em sistemas agroflorestais. In: ENCONTRO DE FRUTAS NATIVAS DO NORTE E NORDESTE DO BRASIL, 1., 2008, São Luís. Frutas nativas: novos sabores para o mundo. São Luís: UEMA: SBF: EMBRAPA: SEBRAE: SEAGRO, 2008. 1 CD-ROM.Tipo: Artigo em Anais de Congresso / Nota Técnica |
Biblioteca(s): Embrapa Amazônia Ocidental. |
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16. | | MACEDO, J. L. V. de. Atividades de manejo na área experimental. In: SHIFT PROJECT ENV 23 (Manaus-AM). Recuperação de áreas degradadas e abandonadas, através de sistemas de policultivo. Manaus: EMBRAPA-CPAA: University of Hamburg, 1998. p. 1-2.Tipo: Capítulo em Livro Técnico-Científico |
Biblioteca(s): Embrapa Amazônia Ocidental. |
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Registros recuperados : 477 | |
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Nenhum registro encontrado para a expressão de busca informada. |
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