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| Pacheco,Anderson Almeida; Ker,João Carlos; Schaefer,Carlos Ernesto Gonçalves Reynaud; Fontes,Mauricio Paulo Ferreira; Andrade,Felipe Vaz; Martins,Eder de Souza; Oliveira,Fábio Soares de. |
| ABSTRACT Although the physical environment of the Atlantic Forest realm is well known, studies on the soil-landform relationships are fundamental to improve the management of soil resources to facilitate sustainable development. The purpose of this study was to evaluate a representative topossequence on the “Mares de Morros” landscape of deeply weathered regolith on leucocratic granite rocks and demi-orange convex slopes. The soils varied along the topossequence according to drainage and were classified as Acrudox, Pseudogleysol, and Epiaquent. The clay fraction was composed by kaolinite, in association with gibbsite, goethite, hematite, and traces of vermiculite and hydroxy-Al interlayered vermiculite (HIV). The kaolinite crystallinity index obtained by... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Kaolinite crystallinity; Pseudogleysol; “Mares de Morros” landscape; Thermal analysis. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832018000100308 |
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| Pereira,Thiago Torres Costa; Almeida,Ivan Carlos Carreiro; Oliveira,Fábio Soares de; Schaefer,Carlos Ernesto Gonçalves Reynaud; Pinheiro,Leandro de Souza; Matuk,Fernanda Ayaviri. |
| ABSTRACT: Currently, the Brazilian savanna (Cerrado) represents the main agricultural area of the country, comprising a great variety of landscapes and soils, geological formations and vegetation patterns, as well as the major watershed. We studied the hydropedology and morphometry of a representative catchment (Frutal river), on a high tableland (Chapada) in the Triângulo Mineiro region, Brazil, describing the soil-water-landscape relationships to understand land use and water resources. To this end, we applied physical, chemical, micromorphological, and morphometric methods. When dry, compaction was observed in well-structured Ferralsols (Latossolos) with medium texture under intensive agriculture, reducing the water recharge capacity. The soil carbon... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Rhodic Ferralsols; Gleysols; Hydromorphic savannas; Veredas. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832018000100503 |
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| Mateus,Ana Carolina Campos; Oliveira,Fábio Soares de; Varajão,Angélica Fortes Drummond Chicarino; Soares,Caroline Cibele Vieira. |
| ABSTRACT Pedological studies using X-ray diffraction (XRD), X-ray fluorescence (XRF), optical microscopy, and scanning electron microscopy (SEM-EDS) showed a Xanthic Ferralsol formed from the degradation of bauxite on a slope in the Caparaó region, in southeastern Brazil. We found a decrease in the number and size of bauxite fragments toward the top of the profiles, bauxite fragments that were more degraded at the top of the profiles, transformation of gibbsite into kaolinite, and absolute enrichment in silicon in the mass balance. These indicators suggest that resilication could be the major process responsible for formation of the soil; detailed studies are needed to verify the origin of the silica. The reintroduction of silica into the system occurs by... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Pedogenesis; Ferralsol; Kaolinite; Micromorphology. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832017000100314 |
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| Gonçalves,Mariana Gabriele Marcolino; Ker,João Carlos; Oliveira,Fábio Soares de; Ramos,Letícia Onara Silva; Pacheco,Anderson Almeida; Curi,Nilton. |
| ABSTRACT Soils of the semi-arid region of Minas Gerais have small depth; hard, very hard or even extremely hard consistency when dry and very plastic and very sticky when moist; columnar or angular blocky structure and significant cracking along the profile in the dry period, however they have not been deeply studied yet. Thus, the aim of this study was to detail the genesis of Luvisols in the Semi-arid Depression of the Jequitinhonha Valley (MG), incompassing morphological, physical, chemical, micromorphological and mineralogical attributes, and their relationships. The lack of illuviation coatings in the micromorphological analysis is in line with the expressionless and unclear clay skins observed in the top of the B horizon in only one out of the four... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil mineralogy; Cation exchange capacity; Soil micromorphology.. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542019000100234 |
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