40 documents found, page 1 of 4
Association of Post-Barreiras and Barreiras Formation strata and influence on s...
Souza,Cristiano Marcelo Pereira de; Costa,Liovando Marciano da; Firmino,Francis Henrique Tenório; Lima,Carlos César Uchôa deABSTRACT The term Post-Barreiras is a definition for sediments above the deposits of the Barreiras Formation, and the genesis of soils in these environments must be related to sedimentary deposition. Our objective was to apply multi-technique analyses to characterize the sediments and soils to understand pedogenesis in these environments. We analysed sedimentological parameters and the geochronology of sediment...
Sambaquis from the coast of Guarapari, Espírito Santo - Brazil: chemistry, phys...
Cardoso,Rafael Said Bhering; Faria,André Luiz Lopes de; Rocha,Pablo de Azevedo; Teixeira,Rafael Cardoso; Costa,Liovando Marciano daAbstract Sambaquis are archaeological sites present mainly in coast and close to the fluvio-lake systems. They are found in most of the Brazilian coast. Sampling and analysis of soils and malacofauna species provide important information about human occupation in a given place. This research aimed to verify, through the analysis of chemical elements present in soils, the occurrence of human occupation in three ...
Prediction of Burned Areas Using the Random Forest Classifier in the Minas Gera...
Santos,Eliana Elizabet dos; Sena,Nathalie Cruz; Balestrin,Diego; Fernandes Filho,Elpidio Inácio; Costa,Liovando Marciano da; Zeferino,Leiliane BozziAbstract Fire behavior prediction models can assist environmental agencies with fire prevention and control. This study aimed to adjust a fire prediction model for the state of Minas Gerais, Brazil. Using the R program and hotspots provided by the National Institute for Space Research (INPE) for 2010, prediction of the probability of fires through the Random Forest algorithm was conducted using the Bootstrappin...
Biogenic, sedimentary, and metamorphic limestone: a comparative characterizatio...
Cazotti,Maria Maiara; Costa,Liovando Marciano da; Cecon,Paulo RobertoABSTRACT Liming acid soils is fundamental for agricultural activity such as the study and characterization of alternative liming material. The objective of this study was to characterize biological, sedimentary, and metamorphic limestones. The following limestones were studied: biogenic (BL), sedimentary (SL), commercial (CL), and marble (ML). This study evaluated total relative neutralizing power (TRNP), chemi...
Pastures Degradation and the Relation with Pedo-Geomorphological Attributes in ...
Souza,Cristiano Marcelo Pereira de; Francelino,Marcio Rocha; Costa,Liovando Marciano da; Fernandes Filho,Elpidio InacioABSTRACT The objective of this study was to map the levels of degradation of pastures and its association with chemical properties of the soil and relief. We selected a sub-basin located in the municipality of Viçosa, Minas Gerais, and we mapped the degradations through Ikonos images that were submitted for classification. Soil samples were collected and analyzed chemically; the results were transformed in spat...
Layered Double Hydroxides as Hosting Matrices for Storage and Slow Release of P...
Benício,Luíz Paulo Figueredo; Eulálio,Denise; Guimarães,Luciano de Moura; Pinto,Frederico Garcia; Costa,Liovando Marciano da; Tronto,JairoThe objective of this work was to synthesize and characterize Layered Double Hydroxides (MgAl-LDHs, MgFe-LDHs, and MgAlFe-LDHs) containing phosphate anions and study P release kinetics was conducted with the prepared materials. The release kinetics tests were performed in water by the stirred-flow method to verify the P release profile from LDHs materials. Results showed LDHs have similar characteristics to tho...
Geochemical Signature of Amazon Tropical Rainforest Soils
Souza,José João Lelis Leal de; Fontes,Maurício Paulo Ferreira; Gilkes,Robert; Costa,Liovando Marciano da; Oliveira,Teogenes Senna deABSTRACT: Evaluating soil geochemical diversity in the Amazon Basin has been a challenge largely because most study sites have been at the edge of the basin and it is difficult to get samples in such a region. Here we show that even among the most weathered soils, physicochemical soil properties express lithology. Our results are based on topsoil samples collected from different locations in minimally disturbed...
Characterization of biochars from different sources and evaluation of release o...
Figueredo,Natália Aragão de; Costa,Liovando Marciano da; Melo,Leônidas Carrijo Azevedo; Siebeneichlerd,Evair Antônio; Tronto,JairoABSTRACT The biochar, product of pyrolysis of organic waste, has been used as a soil conditioner and alternative on solid waste management. However, the raw material and pyrolysis temperature used influence the quantity and dynamics of release of nutrients and contaminants from the biochar. The objective was to evaluate the use of waste sugarcane bagasse, eucalyptus and sewage sludge for production of biochar a...
EFFECTS OF CEMENTATION ON HYDRAULIC CONDUCTIVITY AND ON MECHANICAL STRENGTH OF ...
Viana,Lucimar Arruda; Lima,Dario Cardoso de; Costa,Liovando Marciano da; Silva,Claudio Henrique de Carvalho; Barbosa,Paulo Sérgio de AlmeidaABSTRACT This paper addresses the topic soil stabilization for forest roads applications and analyzes the influence of the hydrated lime in structuring the sand fraction of an artificial soil composed of the sand fractions of two natural soils, simulating natural process of cementation of sands and using binary packing systems. The study included the following topics: (i) characterization of the mechanical stre...
SEDIMENTOLOGICAL PARAMETERS AND DATING OF POST-BARREIRAS SEDIMENTS FROM REGION ...
Souza,Cristiano Marcelo Pereira de; Costa,Liovando Marciano da; Moreau,Ana Maria Souza dos Santos; Gomes,Ronaldo LimaAbstract Although there is some work from the 80s, little is known about the origin and mechanisms of these sediment deposits Post-Barreiras. The aim of this work was to analyze the sedimentological parameters, particle size and morphology of grains of sand and dating of sedments. samples Post-Barreiras and beach sediments were collected, which were subjected to dispersion of clay and silt, using NaOH 0,1 mol L...