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Registro Completo |
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Biblioteca(s): |
Embrapa Pantanal. |
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Data corrente: |
16/08/1995 |
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Data da última atualização: |
16/08/1995 |
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Autoria: |
TYLER, E. J.; BUOL, S. W.; SANCHEZ, P. A. |
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Título: |
Genetic associationm of properties of soil of an area in the Upper Amazon Basin of Peru. |
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Ano de publicação: |
1978 |
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Fonte/Imprenta: |
Soil Science Society of America Journal, v.42, n.5, p.771-776, 1978. |
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Idioma: |
Inglês |
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Conteúdo: |
Soil properties of a 400-ha area in the Upper Amazon Basin of Peru were found to be rela-
ted to the nature of the parent material and to occurrence of defined geomorphic surfaces. The soils are developed from unconsolidated sandy to clay textured river sediments, origi-
nating in the Andes Mountains. The oldest surface is presently on the level hill tops. A surface which cuts the higher older surface and grades to the intervening valley floors of the same age and the recent flood plains is the youngest geomosphic surface. The typic
and Aquic Paleudults of the oldest surface generally have lower pH values, lower base saturation, and contain less weatherable minerals, but contain greater amounts of clay-
sized kaolinite than the soils of the younger surface. The soils of the erosional surface are
Ultisols, Inceptisols or Alfisols. Genetic control of these soils appears to depend upon the location of an impervious layer which controls ground water depth. The alfisols, Inceptisols, and Entisols of the flood plain contain about 15% weatherable minerals and high amounts
of well crystalized smectite clay minerals that have probably undergone limited pedologic
alteration. |
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Palavras-Chave: |
Associacao genetica; Bacia Amazonica; Genetic association; Tropical rainforest soil; Ulfisols; Upper Amazon Basin of Peru. |
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Thesagro: |
Floresta Tropical; Solo Tropical. |
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Thesaurus Nal: |
Alfisols. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01924naa a2200253 a 4500
001 1785604
005 1995-08-16
008 1978 bl --- 0-- u #d
100 1 $aTYLER, E. J.
245 $aGenetic associationm of properties of soil of an area in the Upper Amazon Basin of Peru.
260 $c1978
520 $aSoil properties of a 400-ha area in the Upper Amazon Basin of Peru were found to be rela- ted to the nature of the parent material and to occurrence of defined geomorphic surfaces. The soils are developed from unconsolidated sandy to clay textured river sediments, origi- nating in the Andes Mountains. The oldest surface is presently on the level hill tops. A surface which cuts the higher older surface and grades to the intervening valley floors of the same age and the recent flood plains is the youngest geomosphic surface. The typic and Aquic Paleudults of the oldest surface generally have lower pH values, lower base saturation, and contain less weatherable minerals, but contain greater amounts of clay- sized kaolinite than the soils of the younger surface. The soils of the erosional surface are Ultisols, Inceptisols or Alfisols. Genetic control of these soils appears to depend upon the location of an impervious layer which controls ground water depth. The alfisols, Inceptisols, and Entisols of the flood plain contain about 15% weatherable minerals and high amounts of well crystalized smectite clay minerals that have probably undergone limited pedologic alteration.
650 $aAlfisols
650 $aFloresta Tropical
650 $aSolo Tropical
653 $aAssociacao genetica
653 $aBacia Amazonica
653 $aGenetic association
653 $aTropical rainforest soil
653 $aUlfisols
653 $aUpper Amazon Basin of Peru
700 1 $aBUOL, S. W.
700 1 $aSANCHEZ, P. A.
773 $tSoil Science Society of America Journal$gv.42, n.5, p.771-776, 1978.
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Embrapa Pantanal (CPAP) |
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