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Registro Completo
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Biblioteca(s): |
Embrapa Cerrados. |
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Data corrente: |
11/02/1993 |
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Data da última atualização: |
20/09/2016 |
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Autoria: |
MACEDO, J. |
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Afiliação: |
JAMIL MACEDO, CPAC. |
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Título: |
Morphology, mineralogy, and genesis of a hydrosequence of oxisols in Brazil. |
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Ano de publicação: |
1986 |
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Fonte/Imprenta: |
1986. |
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Páginas: |
73 p. |
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Idioma: |
Inglês |
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Notas: |
Thesis (Master of Science) -- Cornell University, Ithaca. |
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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 |
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Palavras-Chave: |
Brasil; Dark-red latosol; Distrito Federal; Latossolo vermelho-amarelo; Latossolo vermelho-escuro; Morfologia do solo; Oxisolo; Planaltina; Red-yellow latossol; Soil genesis. |
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Thesagro: |
Cerrado; Gênese do Solo; Mineralogia; Solo. |
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Thesaurus NAL: |
Brazil; Ferralsols; mineralogy; soil morphological features; soil sequences. |
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Categoria do assunto: |
--
P Recursos Naturais, Ciências Ambientais e da Terra |
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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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