Data/hora: 16/06/2024 19:16:06

Biblioteca(s): | Embrapa Solos.
Data corrente: | 22/11/2002
Data da última atualização: | 22/11/2002
Autoria: | WITTY, J. E.; KNOX, E. G.
Título: | Identification, role in soil taxonomy, and worldwide distribution of fragipans.
Ano de publicação: | 1989
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).
Páginas: | p.1-9
Idioma: | Inglês
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
Palavras-Chave: | Estados Unidos; Solos.
Thesaurus Nal: | fragipans.
Categoria do assunto: | --
Registro original: | Embrapa Solos (CNPS)
Exemplares: | CNPS - (1128-1) - ADC - PL - -- - 631.4 - S637f - 1993.00062 - DIS