Morfologia dos contatos entre solo-saprolito-rocha em neossolos derivados de arenitos da formação caturrita no Rio Grande do Sul

Pedron, Fabrício de Araújo; Fink, Jessé Rodrigo; Dalmolin, Ricardo Simão Diniz; Azevedo, Antônio Carlos de

doi:10.1590/s0100-06832010000600019

Cited by 12 publications

(13 citation statements)

References 8 publications

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“…The data obtained for Alisols in the South of Brazil revealed that the C horizon should not be considered as saprolite as it does not show morphological or physical and chemical properties compatible with that layer, validating the results of Pedron et al (2009Pedron et al ( , 2010. In this study, the C horizon was identified according to clear evidence of a pedogenic process, which is not in agreement with the description found in the guides used to describe and classify soil profiles (Schoeneberguer et al, 2012;Santos et al, 2013;IUSS Working Group WRB, 2014;USDA, 2014).…”

Section: Boundary Between Soil and Saprolitesupporting

confidence: 74%

“…However, the tendency was reduction in the degree of wet consistency with depth; and transitions were smooth between the Bt and C horizons and irregular to wavy between the C horizons and Cr layers. Irregular and wavy transitions are common among less developed layers, as registered in the Cr layers, reflecting variability of alteration in the weathering processes (Stolt et al, 1993;Pedron et al, 2009Pedron et al, , 2010. Thus, although incipient, a major variation in the C horizon can be interpreted as resulting from pedogenetic processes.…”

Section: Identification Of the Boundary Between Soil And Saprolite Inmentioning

confidence: 97%

“…In this case, due to evidence of the pedogenesis structure, authors such as Pedron et al (2009Pedron et al ( , 2010Pedron et al ( , 2011 classified the C horizon as part of the soil, differing from a Cr layer that represents saprolite at different stage of alteration, but always with the structure of the parent rock.…”

Section: Introductionmentioning

confidence: 99%

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Boundary between Soil and Saprolite in Alisols in the South of Brazil

Pedron

Oliveira

Dalmolin

et al. 2015

Rev. Bras. Ciênc. Solo

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Despite numerous studies conducted on the lower limit of soil and its contact with saprolite layers, a great deal of work is left to standardize identification and annotation of these variables in the field. In shallow soils, the appropriately noting these limits or contacts is essential for determining their behavior and potential use. The aims of this study were to identify and define the field contact and/or transition zone between soil and saprolite in profiles of an Alisol derived from fine sandstone and siltstone/claystone in subtropical southern Brazil and to subsequently validate the field observations through a multivariate analysis of laboratory analytical data. In the six Alisol profiles evaluated, the sequence of horizons found was A, Bt, C, and Cr, where C was considered part of the soil due to its pedogenetic structure, and Cr was considered saprolite due to its rock structure. The morphological properties that were determined in the field and that were different between the B and C horizons and the Cr layer were color, structure, texture, and fragments of saprolite. According to the test of means, the properties that support the inclusion of the C horizon as part of the soil are sand, clay, water-dispersible clay, silt/clay ratio, macroporosity, total porosity, resistance to penetration, cation exchange capacity, fe extracted by DCB, Al, h+Al, and cation exchange capacity of clay. The properties that support the C horizon as a transition zone are silt, Ca, total organic C, and fe extracted by ammonium oxalate. Discriminant analysis indicated differences among the three horizons evaluated.

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Section: Boundary Between Soil and Saprolitesupporting

confidence: 74%

Section: Identification Of the Boundary Between Soil And Saprolite Inmentioning

confidence: 97%

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Boundary between Soil and Saprolite in Alisols in the South of Brazil

Pedron

Oliveira

Dalmolin

et al. 2015

Rev. Bras. Ciênc. Solo

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“…Apenas na estreita área plana que forma o fundo do enclave, onde as declividades foram menores, foi encontrado Neossolo Quartzarênico, com horizonte A assentado sobre horizonte C. Em ambos os solos, o material de origem é constituído de rochas sedimentares, sendo arenito o material mais frequente, em associação com argilitos e siltitos. Neossolos Litólicos e Neossolos Regolíticos derivados de rochas sedimentares ocorrem com certa frequência na região e conferem a esses locais um grau de fragilidade acentuada e de limitação para uso agrícola (PEDRON et al, 2010). Aproximadamente a 30km de distância do local do presente estudo, PEDRON et al (2010) O teor de MO encontrado foi baixo para os dois grupos fi tossociológicos em todos os intervalos de declividade (Tabela 1), o que pode estar relacionado com o material de origem arenítico e com a declividade acentuada da maior parte da área.…”

Section: Resultsunclassified

“…Neossolos Litólicos e Neossolos Regolíticos derivados de rochas sedimentares ocorrem com certa frequência na região e conferem a esses locais um grau de fragilidade acentuada e de limitação para uso agrícola (PEDRON et al, 2010). Aproximadamente a 30km de distância do local do presente estudo, PEDRON et al (2010) O teor de MO encontrado foi baixo para os dois grupos fi tossociológicos em todos os intervalos de declividade (Tabela 1), o que pode estar relacionado com o material de origem arenítico e com a declividade acentuada da maior parte da área. Solos derivados de materiais sedimentares não favorecem a adsorção de ácidos orgânicos, devido à baixa formação de complexo sortivo, fazendo com que o conteúdo orgânico seja rapidamente degradado pela atividade microbiana.…”

Section: Resultsunclassified