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All publications of “Carlos Ernesto Gonçalves Reynaud Schaefer”

6 results

Digital Soil Mapping Using Machine Learning Algorithms in a Tropical Mountainous Area

Martin Meier, Eliana de Souza, Marcio Rocha Francelino, Elpídio Inácio Fernandes Filho, Carlos Ernesto Gonçalves Reynaud Schaefer

02/Nov/2018

ABSTRACT: Increasingly, applications of machine learning techniques for digital soil mapping (DSM) are being used for different soil mapping purposes. Considering the variety of models available, it is important to know their performance in relation to soil data and environmental variables involved in soil mapping. This paper investigated the performance of eight machine learning algorithms for soil mapping in a tropical mountainous area of an official rural settlement in the Zona da Mata region in Brazil. Morphometric maps generated from […]

Mineralogy, Micromorphology, and Genesis of Soils with Varying Drainage Along a Hillslope on Granitic Rocks of the Atlantic Forest Biome, Brazil

Anderson Almeida Pacheco, João Carlos Ker, Carlos Ernesto Gonçalves Reynaud Schaefer, Mauricio Paulo Ferreira Fontes, Felipe Vaz Andrade, Eder de Souza Martins, [...]

06/Jul/2018

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 […]

Hydropedology of a High Tableland with Cerrado, Brazilian Central Plateau: the Frutal Catchment Case Study

Thiago Torres Costa Pereira, Ivan Carlos Carreiro Almeida, Fábio Soares de Oliveira, Carlos Ernesto Gonçalves Reynaud Schaefer, Leandro de Souza Pinheiro, Fernanda Ayaviri Matuk

19/Jan/2018

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, […]

Environmental Correlation and Spatial Autocorrelation of Soil Properties in Keller Peninsula, Maritime Antarctica

André Geraldo de Lima Moraes, Marcio Rocha Francelino, Waldir de Carvalho, Marcos Gervasio Pereira, André Thomazini, Carlos Ernesto Gonçalves Reynaud Schaefer

12/Dec/2017

ABSTRACT: The pattern of variation in soil and landform properties in relation to environmental covariates are closely related to soil type distribution. The aim of this study was to apply digital soil mapping techniques to analysis of the pattern of soil property variation in relation to environmental covariates under periglacial conditions at Keller Peninsula, Maritime Antarctica. We considered the hypothesis that covariates normally used for environmental correlation elsewhere can be adequately employed in periglacial areas in Maritime Antarctica. For that […]

Ethnopedology of a Quilombola Community in Minas Gerais: Soils, Landscape, and Land Evaluation

Fernanda Ayaviri Matuk, Carlos Ernesto Gonçalves Reynaud Schaefer, Felipe Nogueira Bello Simas, Thiago Torres Costa Pereira, Davi Feital Gjorup, France Maria Gontijo Coelho

18/Jan/2017

ABSTRACT Quilombolas are Afro-brazilian rural peasants who descended from escaped slaves who tried to carve out territories of autonomy (called Quilombos) by collective organization and resistance. Despite many anthropological and ethnopedological studies, little research has been carried out to identify the agricultural practices and the knowledge of people who live in the Quilombos (Quilombolas). Peasant communities who live from land resources have wide empirical knowledge related to local soils and landscapes. In this respect, ethnopedology focuses on their relationship with […]

Relationship between Soil Properties and Vegetation in the Ecotone Region of the Middle São Francisco River Valley, Brazil

Daniel Meira Arruda, Carlos Ernesto Gonçalves Reynaud Schaefer, Mateus Lanna Borges de Moraes

01/Dec/2015

ABSTRACT The Middle São Francisco River valley is a vast territorial area with marked seasonal change and diversity of lithology, landscapes, soil, and vegetation. However, the relationships between soil characteristics and plant communities are poorly known. In this study, we show the relationships between key soil properties that determine the establishment of savanna-steppe, wooded savanna-steppe, savanna, semideciduous forest, and deciduous forest in this region through analysis of 166 soil profiles. In general, savanna soils are much more leached, Al-saturated, and […]