Sandy soil spots in northwestern Paraná: approaches for identification and quantification Leonardo José Cordeiro Santos, José Guilherme Oliveira, Fabio Marcelo Breunig, M´árcia Regina Calegari, Elias Fernando Berra, et al. Revista Brasileira De Geomorfologia, 2024 The predominance of sandy soils in the Northwest region of the state of Paraná, associated with the removal of natural vegetation, favored the development of patches of white sand on the surface without any aggregation. These spots are associated with the different types of land use existing in the region and the process of lateral soil transformation. As they constitute material without aggregation, they can be easily transported by wind and water and deposited in water bodies, causing severe environmental impacts. Thus, using thermal infrared satellite images, the objective of the present study was to map, determine the formation process of the spots and estimate the predominant particle size fractions. The model used and validated with field and laboratory information, allowed the identification of surfaces with patches of white sand present in the study region and estimating their percentage in different classes. After filtering the samples with vegetation cover during the product calculation period, an R² of 0.78 was obtained. The removal of natural vegetation has contributed to the formation and expansion of sandy patches and erosion in the northwest region of Paraná.
Phytolith signature from grassland and araucaria forest in Southern Brazil Synthesis of Some Phytolith Studies in South America Brazil and Argentina, 2014
Opal phytolith extraction in oxisols Marcia R. Calegari, Marco Madella, Pablo Vidal-Torrado, Xosé Luis Otero, Felipe Macias, et al. Quaternary International, 2013
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MOST CITED SCHOLAR PUBLICATIONS
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Ocorrência e significado paleoambiental do horizonte A húmico em Latossolos MR Calegari Universidade de São Paulo , 2008 2008 Citations: 56
Opal phytolith extraction in oxisols MR Calegari, M Madella, P Vidal-Torrado, XL Otero, F Macias, ... Quaternary International 287, 56-62 , 2013 2013 Citations: 44
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Genesis and variation spatial of Podzol in depressions of the Barreiras Formation, northeastern Espírito Santo State, Brazil, and its implications for Quaternary climate change JA Schiavo, LCR Pessenda, AAB Júnior, MR Calegari, M Fornari, ... Journal of South American Earth Sciences 98, 102435 , 2020 2020 Citations: 11
Palaeoenvironmental records of Histosol pedogenesis in upland area, Espírito Santo State (SE, Brazil) EC da Silva Neto, MG Pereira, M de Araujo Carvalho, MR Calegari, ... Journal of South American Earth Sciences 95, 102301 , 2019 2019 Citations: 11
