Genesis and classification of Oxisols in a highland toposequence of the upper Jequitinhonha Valley (MG)

Ferreira, Celmo Aparecido; Silva, Alexandre Christófaro; Vidal‐Torrado, Pablo; Rocha, Welington Willian

doi:10.1590/s0100-06832010000100020

Cited by 17 publications

(29 citation statements)

References 26 publications

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“…It might have occurred due to formation of organometallic complexes with Al 3+ , which raises organic matter resistance reducing Al 3+ losses, as already reported by Inda Junior et al (2007). Aluminum saturation (m) was higher in the surface horizons, corroborating the results obtained by Ferreira et al (2010), however, these soils show no alitic character nor aluminic since the Al 3+ contents in diagnostic horizons were below to 4 cmolc kg -1 (SANTOS et al, 2013a). .…”

Section: Resultssupporting

confidence: 79%

“…Table 3 shows increasing values of S and CEC along transect, which might be related to growing rates of clay from P1 to P3 (Table 2). Aluminum saturation (m) was stronger in surface horizons, as observed by Ferreira et al (2010). The TOC for all profiles is more significant in A horizon, which is related to the input of organic matter provided by native vegetation.…”

Section: Resultssupporting

confidence: 51%

“…As claimed by Ferreira et al (2010), Db in surface horizons of latosols under native vegetation is low, typically less than 1.0 Mg m -3…”

Section: Resultsmentioning

confidence: 75%

“…Several studies have pointed out that latosols cover the planning surfaces, being one of the most common soils of savanna plateaus of flat to gently undulating relief, over a vast area in Brazil (FERREIRA, et al, 2010;KER, 1998;FERREIRA, et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

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Characterization of Yellow Latosols (Oxisols) of Serra Do Quilombo, in Piauí State Savanna Woodlands - Brazil

et al. 2016

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-The savanna woodlands of Piauí state has great economic importance since it is an area for agricultural expansion, being the fourth most important of Brazil and the first from Brazilian Northeastern. The area accounts for 5.9% of the Brazilian savanna woodlands and 36.9% of the Northeastern savanna, covering 46% of the Piauí state area, in a total of 11.5 million hectares. The goal of this research was to study pedoenvironments of Serra do Quilombo region, which is in Piauí state savanna, as well as identifying existing soil classes, according to the Brazilian System of Soil Classification -SiBCS. Soil identification consisted in characterizing soil profiles along a transect, assessing in-field conditions and collecting soil samples, in areas of native vegetation. The samples were gathered from three distinct points, being two at the edges and one at the center of the plateau. Soil analyses were carried out with samples collected from each horizon through trench digging up to a 2-m depth. Morphological, physical, chemical and mineralogical characterizations were performed for each soil profile, along with an evaluation of the effect of pedogenic factors on their formation and development. All soils under study were formed with source materials of the same geological formation; however, each rock has a distinct contribution to the process, involving sandstones and shales. The characteristics observed in the soil from Serra do Quilombo have no difference from the pattern found in the Brazilian plateaus, and soil profiles were classified as dystrophic clayey Yellow Latosols (Oxisols), according to the SiBCS.Key words: Soil classification. Latosolization. Pedogenesis. CARACTERIZAÇÃO DE LATOSSOLOS AMARELOS DA SERRA DO QUILOMBO NO CERRADO PIAUIENSERESUMO -O Cerrado piauiense tem grande importância econômica por ser uma área de expansão agrícola, sendo o quarto mais importante do Brasil e o primeiro do Nordeste. Representa 5,9 % do cerrado brasileiro, 36,9 % do nordestino e 46 % da área total do Estado do Piauí, ao todo são 11,5 milhões de hectares. O objetivo desta pesquisa foi estudar os pedoambientes da Serra do Quilombo, localizada no cerrado piauiense, e identificar as classes de solos existentes de acordo com o Sistema Brasileiro de Classificação de Solos. A identificação dos solos consistiu na caracterização de perfis de solo ao longo de um transecto, com a avaliação e coleta de solos em áreas de vegetação nativa, em três pontos, sendo nas extremidades e no centro da chapada. A análise dos solos e a coleta de amostras de cada horizonte dos três perfis de solo foram realizadas mediante abertura de trincheiras, com 2 m de profundidade. Foi feita a caracterização morfológica, física, química e mineralógica de cada perfil dos solos, juntamente com avaliação da influência dos fatores pedogenéticos na sua formação e evolução. Os solos estudados são formados de materiais de origem da mesma formação geológica, no entanto, com diferentes contribuições das diversas rochas, envolvendo arenitos e folhelhos. As car...

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Section: Resultssupporting

confidence: 79%

Section: Resultssupporting

confidence: 51%

“…As claimed by Ferreira et al (2010), Db in surface horizons of latosols under native vegetation is low, typically less than 1.0 Mg m -3…”

Section: Resultsmentioning

confidence: 75%

Section: Introductionmentioning

confidence: 99%

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Characterization of Yellow Latosols (Oxisols) of Serra Do Quilombo, in Piauí State Savanna Woodlands - Brazil

et al. 2016

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“…The above-mentioned conditioned is clearly a case where soil internal drainage, as controlled by strata dip angle, acts as a dependent factor of soil formation. Similar trends for yellow and red soils were compiled for the US southeastern Piedmont (Richardson;Daniels, 1993) and in Northern Minas Gerais (Ferreira et al, 2010), but in both cases soil internal drainage is independent on topography. However, in some cases, different soils with varying internal drainage may be formed under the same topography.…”

Section: Introductionsupporting

confidence: 61%

Xanthic- and Rhodic-Acrudoxes under cerrado vegetation: differential internal drainage and covarying micromorphological properties

et al. 2016

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Soil internal drainage plays a major role in soil genesis, and it is mostly dependent on topography. However, the existence of sedimentary and meta-sedimentary rock strata with variable dip angle allows for strong differences in internal drainage for identical topographies, which result in a marked differentiation in the properties of overlain soils. This work aimed to investigate the micromorphology of soils formed from different dip angles of rock strata and their relationships to internal drainage, in Minas Gerais, Brazil. Over horizontal strata, a Xanthic Acrudox lacking hematite and with blocky structure has developed. Over strata with 45° dip angle, strong drainage has resulted in intense desilication, forming a Rhodic Acrudox having hematite and with strong fine granular structure. Micromorphological analyses showed that both soils contain relict nodules which are probably being dissolved in the current environment, whereas only the Xanthic Acrudox has nodules in current processes of formation due to slower drainage. The Cr horizon of both soils, but mainly the Xanthic Acrudox, presented a much slower saturated hydraulic conductivity than the respective overlying horizons, which was associated with a pattern of poorly connected fissural pores as seen in thin sections. The Cr horizon of the Rhodic Acrudox showed a matrix impregnated by Mn and Fe oxides in an unusual pattern of microlamination and hypocoatings that appear to be unstable, dissolving in the current, strongly drained environment. The soil color is a reliable indicator of such differential pedogenesis in these conditions. Index terms: Soil genesis; xanthization; rubefication; plinthite; saprolith. RESUMOA drenagem interna desempenha um importante papel na gênese de solos e é principalmente dependente da topografia. Contudo, a existência de estratos de rochas sedimentares e meta-sedimentares com ângulo de inclinação variável permite forte diferença na drenagem interna em locais de topografia semelhante, o que resulta em marcante diferenciação de propriedades dos solos acima. Este trabalho teve como objetivo investigar a micromorfologia do solo com estratos de rochas com diferentes ângulos de inclinação e suas relações com a drenagem interna dos solos, em Minas Gerais, Brasil. Sobre estratos horizontalizados, formou-se um Latossolo Amarelo ácrico típico sem hematita e de fraca estrutura média em blocos subangulares. Sobre estratos com ângulo de inclinação de 45°, a drenagem forte resultou em intensa dessilicatização, formando um Latossolo Vermelho ácrico contendo hematita e de estrutura forte muito pequena granular. As análises micromorfológicas mostraram que ambos os solos contêm nódulos reliquiais que estão provavelmente sendo dissolvidos no ambiente atual, enquanto somente o Latossolo Amarelo possui nódulos em processo de formação, devido à drenagem mais lenta. Os horizontes Cr de ambos os solos, mas principalmente do Latossolo Amarelo, apresentaram condutividade hidráulica saturada muito menor do que os horizontes sobrejacentes, em as...

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Oxic Horizon

Bockheim¹

2014

Soil Geography of the USA

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Genesis and classification of Oxisols in a highland toposequence of the upper Jequitinhonha Valley (MG)

Cited by 17 publications

References 26 publications

Characterization of Yellow Latosols (Oxisols) of Serra Do Quilombo, in Piauí State Savanna Woodlands - Brazil

Characterization of Yellow Latosols (Oxisols) of Serra Do Quilombo, in Piauí State Savanna Woodlands - Brazil

Xanthic- and Rhodic-Acrudoxes under cerrado vegetation: differential internal drainage and covarying micromorphological properties

Oxic Horizon

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