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Registro Completo |
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Biblioteca(s): |
Embrapa Solos. |
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Data corrente: |
22/11/2002 |
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Data da última atualização: |
22/11/2002 |
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Autoria: |
WITTY, J. E.; KNOX, E. G. |
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Título: |
Identification, role in soil taxonomy, and worldwide distribution of fragipans. |
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Ano de publicação: |
1989 |
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Fonte/Imprenta: |
In: SMECK, N.E.; CIOLKOSZ, E.J. Fragipans: their occurrence, classificacao and genesis. Madison: Soil Science Society of America, 1989. (SSSA. Special Publication, 24). |
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Páginas: |
p.1-9 |
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Idioma: |
Inglês |
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Conteúdo: |
The fragipan is identified in Soil Taxonomy as a genetic soil horizon. It is a diagnostic subsurface horizon that restricts the penetration of roots and water. The definition has not facilitated consistent recognition of fragipans. Major identification problems are determination of pedogenic origin and verification of the required brittleness. Interpretations for use of soils with a dense layer that limits roots and water do not depend on origin. The fragipan is used as a criterion for great groups in the Alfisol, Inceptisol, Spodosol, and Ultisol orders. Soils with a fragipan are dominantly in mid-latitudes in medium-textured, acidic glacial drift, loess, colluvium, lacustrine materials, or alluvium. They most commonly have a udic or aquic moisture regime. They have been mapped primarily in the USA and Zew Zealand. Small-scale maps underestimate their extent in other countries where they may occur. A better definition is needed for consistent recognition |
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Palavras-Chave: |
Estados Unidos; Solos. |
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Thesaurus Nal: |
fragipans. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01568naa a2200181 a 4500
001 1327875
005 2002-11-22
008 1989 bl uuuu u00u1 u #d
100 1 $aWITTY, J. E.
245 $aIdentification, role in soil taxonomy, and worldwide distribution of fragipans.
260 $c1989
300 $ap.1-9
520 $aThe fragipan is identified in Soil Taxonomy as a genetic soil horizon. It is a diagnostic subsurface horizon that restricts the penetration of roots and water. The definition has not facilitated consistent recognition of fragipans. Major identification problems are determination of pedogenic origin and verification of the required brittleness. Interpretations for use of soils with a dense layer that limits roots and water do not depend on origin. The fragipan is used as a criterion for great groups in the Alfisol, Inceptisol, Spodosol, and Ultisol orders. Soils with a fragipan are dominantly in mid-latitudes in medium-textured, acidic glacial drift, loess, colluvium, lacustrine materials, or alluvium. They most commonly have a udic or aquic moisture regime. They have been mapped primarily in the USA and Zew Zealand. Small-scale maps underestimate their extent in other countries where they may occur. A better definition is needed for consistent recognition
650 $afragipans
653 $aEstados Unidos
653 $aSolos
700 1 $aKNOX, E. G.
773 $tIn: SMECK, N.E.; CIOLKOSZ, E.J. Fragipans: their occurrence, classificacao and genesis. Madison: Soil Science Society of America, 1989. (SSSA. Special Publication, 24).
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Embrapa Solos (CNPS) |
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