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Solid Earth An interactive open-access journal of the European Geosciences Union
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Preprints
https://doi.org/10.5194/se-2019-131
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/se-2019-131
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

  03 Sep 2019

03 Sep 2019

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This preprint was under review for the journal SE but the revision was not accepted.

Soil-landscape relationship in sandstone-gneiss topolithosequence in Amazonas, Brazil

Julimar da Silva Fonseca1, Milton César Costa Campos1, Elilson Gomes de Brito Filho1, Bruno Campos Mantovanelli2, Laércio Santos Silva3, Alan Ferreira Leite de Lima1, José Maurício Da Cunha1, Emily Lira Simões1, and Luís Antônio Coutrim dos Santos1 Julimar da Silva Fonseca et al.
  • 1Universidade Federal do Amazonas - UFAM, Instituto de Educação, Agricultura e Ambiente, Humaitá, Amazonas, Brasil
  • 2Universidade Federal de Santa Maria - UFSM, departamento de agronomia, Santa Maria, Rio Grande do Sul, Brasil
  • 3Universidade Estadual Paulista - UNESP, departamento de agronomia, Jaboticabal, São Paulo, Brasil

Abstract. Soil position in the landscape reveals its history of formation and genesis. Therefore, the landscape is the combination of features of the surface of the earth with subsurface components (parent material), while the soil is a three-dimensional, dynamic natural body inserted in the landscape. This research aimed to study the soil-landscape relationship in a sandstone-gneiss topolithosequence in Amazonas, Brazil. The study was carried out along a 9.253-meter transect from the top downwards the softer slope. Soil profiles were selected in five landscape compartments (top, upper third, lower third, transport foothill, and deposition foothill). Morphological, mineralogical, physical, chemical, and ray diffraction characterizations were performed. Soils had different morphological, physical, chemical, and mineralogical attributes due to the variations of the geological substrate and landscape position. The mineralogy of the clay fraction is composed of kaolinite, goethite, hematite, and gibbsite, with goethite being the predominant iron oxide. A sand fraction dominance was observed in relation to the other fractions in all the profiles, being related to the alluvial nature of the parent material, with the highest values occurring in the lower third. The separation of the landscape into geomorphic surfaces and identification of the parent material were effective for understanding the variation of soil attributes along the landscape.

Julimar da Silva Fonseca et al.

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Julimar da Silva Fonseca et al.

Julimar da Silva Fonseca et al.

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Short summary
The Amazon biome has a rich biodiversity, as well as the soils that suffer from the current intensive deforestation, so this work brings important information of the soils of this biome evaluating the most diverse aspects and relating with the dynamics of this complex ecosystem. Bringing important results such as clay mineralogy revealed that the poor chemistry due to the low CTC of these soils is related to the source material and not to environmental removal, as is common in Amazonian soils.
The Amazon biome has a rich biodiversity, as well as the soils that suffer from the current...
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