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Registro Completo |
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Biblioteca(s): |
Embrapa Cerrados; Embrapa Semiárido; Embrapa Solos. |
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Data corrente: |
26/07/1996 |
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Data da última atualização: |
22/05/2000 |
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Autoria: |
MONIZ, A. C. |
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Título: |
Formation of an oxisol-ultisol transition in Sao Paulo, Brazil. |
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Ano de publicação: |
1980 |
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Fonte/Imprenta: |
Raleigh: North Carolina State University, 1980. |
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Páginas: |
290p. |
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Idioma: |
Inglês |
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Notas: |
PhD.Thesis. |
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Conteúdo: |
This study of an Oxisol-Ultisol transition allowed the development of a double-water flow model as the most important single factor in explaining the formation of soil structure as well as controlling the chemical and mineralogical transformation that occur during the soil development. According to this view, soil development results from the action of both lateral - and base-water flow, integrated in the landscape, rather than the classic vertical interpretation of soil development. The argillic horizon is formed inside a layer having a blocky structure which runs along the sloping portions of both the Itatiba and Mogi Guacu toposequences and thickens gradually downslope. This blocky structured layer is affected mainly by the lateral-water flow and its soil structure is formed by wetting and drying cycles. This layer, with higher bulk density than the oxic material underlying it, is interpreted to be compressed or consolidated by desiccation, according to soil mechanics terminology. The formation of a blocky structure from a fine granular structure represents the first step in the compression process. Prismatic and columnar structures are formed as the compression progresses toward the shrinkage limit of a particular texture. Further modifications in the structure result in the formation of a sepic plasmic fabric where soil materials have crystalline swelling. Clay arrangement, starting at the ped surface when compression is low, extends inside the ped when compression is increased. The main feature of the........ MenosThis study of an Oxisol-Ultisol transition allowed the development of a double-water flow model as the most important single factor in explaining the formation of soil structure as well as controlling the chemical and mineralogical transformation that occur during the soil development. According to this view, soil development results from the action of both lateral - and base-water flow, integrated in the landscape, rather than the classic vertical interpretation of soil development. The argillic horizon is formed inside a layer having a blocky structure which runs along the sloping portions of both the Itatiba and Mogi Guacu toposequences and thickens gradually downslope. This blocky structured layer is affected mainly by the lateral-water flow and its soil structure is formed by wetting and drying cycles. This layer, with higher bulk density than the oxic material underlying it, is interpreted to be compressed or consolidated by desiccation, according to soil mechanics terminology. The formation of a blocky structure from a fine granular structure represents the first step in the compression process. Prismatic and columnar structures are formed as the compression progresses toward the shrinkage limit of a particular texture. Further modifications in the structure result in the formation of a sepic plasmic fabric where soil materials have crystalline swelling. Clay arrangement, starting at the ped surface when compression is low, extends inside the ped when compressi... Mostrar Tudo |
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Palavras-Chave: |
Brasil; Formacao; Mineralogical transformation; Sao Paulo; Soil chemicophysical properties; Solos; Structure; Utisol. |
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Thesagro: |
Água; Estrutura do Solo; Oxisol; Solo; Ultissolo. |
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Thesaurus Nal: |
Acrisols; classification; Ferralsols; soil; soil structure; water. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02429nam a2200361 a 4500
001 1559890
005 2000-05-22
008 1980 bl uuuu m 00u1 u #d
100 1 $aMONIZ, A. C.
245 $aFormation of an oxisol-ultisol transition in Sao Paulo, Brazil.
260 $aRaleigh: North Carolina State University$c1980
300 $a290p.
500 $aPhD.Thesis.
520 $aThis study of an Oxisol-Ultisol transition allowed the development of a double-water flow model as the most important single factor in explaining the formation of soil structure as well as controlling the chemical and mineralogical transformation that occur during the soil development. According to this view, soil development results from the action of both lateral - and base-water flow, integrated in the landscape, rather than the classic vertical interpretation of soil development. The argillic horizon is formed inside a layer having a blocky structure which runs along the sloping portions of both the Itatiba and Mogi Guacu toposequences and thickens gradually downslope. This blocky structured layer is affected mainly by the lateral-water flow and its soil structure is formed by wetting and drying cycles. This layer, with higher bulk density than the oxic material underlying it, is interpreted to be compressed or consolidated by desiccation, according to soil mechanics terminology. The formation of a blocky structure from a fine granular structure represents the first step in the compression process. Prismatic and columnar structures are formed as the compression progresses toward the shrinkage limit of a particular texture. Further modifications in the structure result in the formation of a sepic plasmic fabric where soil materials have crystalline swelling. Clay arrangement, starting at the ped surface when compression is low, extends inside the ped when compression is increased. The main feature of the........
650 $aAcrisols
650 $aclassification
650 $aFerralsols
650 $asoil
650 $asoil structure
650 $awater
650 $aÁgua
650 $aEstrutura do Solo
650 $aOxisol
650 $aSolo
650 $aUltissolo
653 $aBrasil
653 $aFormacao
653 $aMineralogical transformation
653 $aSao Paulo
653 $aSoil chemicophysical properties
653 $aSolos
653 $aStructure
653 $aUtisol
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Registro original: |
Embrapa Cerrados (CPAC) |
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