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| Dias,Laura Milani da Silva; Coelho,Ricardo Marques; Valladares,Gustavo Souza; Assis,Ana Carolina Cunha de; Ferreira,Edilene Pereira; Silva,Rafael Cipriano da. |
| Resumo O objetivo deste trabalho foi avaliar diferentes estratégias para a predição da distribuição de classes de solo em mapas pedológicos digitais de áreas sem dados de referência, na bacia sedimentar do São Francisco, no Norte de Minas Gerais. As estratégias incluíram: o detalhamento da legenda, o treinamento por observações em campo, a ampliação do conjunto de treinamento e o uso de diferentes algoritmos de mineração de dados. Foram elaboradas quatro matrizes, diferenciadas pelo volume de dados, para o aprendizado dos algoritmos, e pelo nível taxonômico das classes de solo a serem preditas. Avaliou-se o desempenho dos algoritmos de aprendizado de máquina - Random Forest, J48 e MLP -, associados a procedimentos de discretização, balanceamento de... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Acurácia de mapas pedológicos; Algoritmos de classificação; Mapa digital de solos; Variáveis preditivas do meio físico. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2016000901396 |
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| Ferreira,Edilene Pereira; Anjos,Lúcia Helena Cunha dos; Pereira,Marcos Gervasio; Valladares,Gustavo Souza; Cipriano-Silva,Rafael; Azevedo,Antônio Carlos de. |
| ABSTRACT Information is scarce on the genesis and classification of soils derived from calcareous rocks in the Northeastern region of Brazil. This study describes the morphological, physical, chemical, mineralogical, and micromorphological properties of four soil profiles (P1-P4) located in the Apodi Plateau. A pedogenesis hypothesis and soil classification, according to the Brazilian System of Soil Classification (SiBCS), are proposed for these profiles. The interactions between parent material, surface topography and climate affected the pedogenesis processes and soil properties, although the calcareous nature of the parent material most affected the soil morphology and chemical properties. The sand fraction contained mainly quartz and calcite, and a... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Karst system; Brazilian Soil Classification System; Soil mineralogy; Soil micromorphology. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832016000100303 |
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| Ferreira,Edilene Pereira; Coelho,Ricardo Marques; Valladares,Gustavo Souza; Dias,Laura Milani da Silva; Assis,Ana Carolina Cunha de; Silva,Rafael Cipriano da; Azevedo,Antonio Carlos de; Abreu,Cleide Aparecida de. |
| ABSTRACT Lithological and geomorphological variations determine formation of soils with different mineralogical constitutions and can influence the distribution of potentially toxic elements (PTE). The aim of this study was to determine the contents of PTE and mineralogical assemblages along soil profiles of different classes and parent materials and to investigate the association among these factors in the São Francisco sedimentary basin in the northern part of the state of Minas Gerais (Brazil). Eight soil pedons of different classes that developed from different parent materials (limestone, siltstone, phyllite, alluvial-colluvial sediments, detrital cover, and rhythmite) were studied in two lithotoposequences. Soil morphological, particle-size, and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Parent material; Pedogenesis; Soil minerals; Trace elements. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832018000100519 |
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| Ferreira,Edilene Pereira; Guerra,Adriano Ribeiro; Azevedo,Antonio Carlos de. |
| ABSTRACT: Regolith characterization in its entirety is particularly difficult in gneissic regoliths due to the heterogeneity of their rock structure. Rare earth elements (REE) are a useful tool in helping understand the evolution of regoliths. This study relates the mineralogy and weathering indexes of three gneisses regoliths (P1-leucocratic, P2-mesocratic and P3-melanocratic gneisses) to the distribution of REE at depth. In soil, clay activity, iron and manganese oxides, CaO, SiO2, P2O5, TiO2, Fe2O3, and MgO showed high positive correlation with REE. The absolute content of REE was enriched in mafic minerals. At the interface between the soil and saprolite, the sum of absolute REE content was greater in soil than in saprolite in P1, while the opposite... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Saprolite; Weathering; Pedogenesis. |
| Ano: 2021 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000301404 |
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