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All publications of “Pablo Vidal-Torrado”

21 results

Genesis and Classification of Sodic Soils in the Northern Pantanal

Jairo Calderari de Oliveira, Mariane Chiapini, Alexandre Ferreira do Nascimento, Eduardo Guimarães Couto, Raphael Moreira Beirigo, Pablo Vidal-Torrado

27/Sep/2017

ABSTRACT The simultaneous occurrence of high levels of exchangeable sodium percentage (ESP) and alkalinity in soils imposes restrictions on plant development and affects physical properties such as porosity, bulk density, permeability, and hydraulic conductivity. Although sodic soils are frequent in the flood plain of the São Lourenço River, northern Pantanal, Brazil, few studies focus on their formation and classification, especially with regard to specific processes and detailed classification into lower categorical levels by the different systems available. The aim of […]

Cemented Horizons and Hardpans in the Coastal Tablelands of Northeastern Brazil

João Bosco Vasconcellos Gomes, José Coelho Araújo, Pablo Vidal-Torrado, Miguel Cooper, Elen Alvarenga da Silva, Nilton Curi

18/Jan/2017

ABSTRACT Horizons with varying degrees of cementation are a common feature of the soils from the coastal tablelands of Northeastern Brazil. In most cases, these horizons are represented by the following subsurface horizons: fragipan, duripan, ortstein, and placic. The aims of this study were to analyze differences regarding the development and the degree of expression of cementation in soils from the coastal tablelands of Northeastern Brazil: Planossolo Háplico (p-SX), Espodossolo Humilúvico (p-EK), Espodossolo Ferrihumilúvico (p-ESK), and Argissolo Acinzentado (p-PAC) pedons. […]

Surface mapping, organic matter and water stocks in peatlands of the Serra do Espinhaço meridional – Brazil

Márcio Luiz da Silva, Alexandre Christófaro Silva, Bárbara Pereira Christófaro Silva, Uidemar Morais Barral, Pablo Gomes e Souza Soares, Pablo Vidal-Torrado

01/Oct/2013

Peatlands are soil environments that store carbon and large amounts of water, due to their composition (90 % water), low hydraulic conductivity and a sponge-like behavior. It is estimated that peat bogs cover approximately 4.2 % of the Earth’s surface and stock 28.4 % of the soil carbon of the planet. Approximately 612 000 ha of peatlands have been mapped in Brazil, but the peat bogs in the Serra do Espinhaço Meridional (SdEM) were not included. The objective of this […]

Genesis of textural contrasts in subsurface soil horizons in the Northern Pantanal-Brazil

Alexandre Ferreira do Nascimento, Sheila Aparecida Correia Furquim, Eduardo Guimarães Couto, Raphael Moreira Beirigo, Jairo Calderari de Oliveira Júnior, Plínio Barbosa de Camargo, [...]

01/Oct/2013

The Pantanal region can be characterized as a quaternary floodplain with predominant sedimentation in the form of alluvial fans. In the geomorphologic and sedimentary evolution, the avulsion process is inherent to this depositional system and its dynamics, together with surface water floods, influence soil sedimentation on this plain. The knowledge and differentiation of these two events can contribute to a better understanding of the variability of soil properties and distribution under the influence of these sedimentation processes. Therefore, this study […]

Mapping, organic matter mass and water volume of a peatland in serra do espinhaço meridional

José Ricardo da Rocha Campos, Alexandre Christófaro Silva, Pablo Vidal-Torrado

01/Jun/2012

Peatlands form in areas where net primary of organic matter production exceeds losses due to the decomposition, leaching or disturbance. Due to their chemical and physical characteristics, bogs can influence water dynamics because they can store large volumes of water in the rainy season and gradually release this water during the other months of the year. In Diamantina, Minas Gerais, Brazil, a peatland in the environmental protection area of Pau-de-Fruta ensures the water supply of 40,000 inhabitants. The hypothesis of […]

Evaluation of unbuffered chloride to extract aluminum bound to organic matter from soils of the coastal plain of São Paulo state

Maurício Rizzato Coelho, Pablo Vidal-Torrado, Xosé Luis Otero Pérez, Vanda Moreira Martins, Felipe Macías Vázquez

01/Oct/2011

Sodium pyrophosphate is the most widely used extractant of Al bound to soil organic matter (Al-humus). However, its selectivity has been questioned, so that some authors have proposed the use of substitutional extractants. To evaluate the effectiveness of unbuffered Cu (CuCl2), La (LaCl3) and K (KCl) chlorides to extract Al-humus, soil material from 31 representative pedons of Spodosols and Quartzipsamments from sandy coastal plains of São Paulo State was evaluated. The results were compared with those achieved by sodium pyrophosphate. […]

Relationship between soil oxidizable carbon and physical, chemical and mineralogical properties of umbric ferralsols

Flávio Adriano Marques, Márcia Regina Calegari, Pablo Vidal-Torrado, Peter Buurman

01/Feb/2011

The occurrence of Umbric Ferralsols with thick umbric epipedons (> 100 cm thickness) in humid Tropical and Subtropical areas is a paradox since the processes of organic matter decomposition in these environments are very efficient. Nevertheless, this soil type has been reported in areas in the Southeast and South of Brazil, and at some places in the Northeast. Aspects of the genesis and paleoenvironmental significance of these Ferralsols still need a better understanding. The processes that made the umbric horizons […]

Pedological and isotopic relations of a highland tropical peatland, Mountain Range of the Espinhaço Meridional (Brazil)

Ingrid Horák, Pablo Vidal-Torrado, Alexandre Christófaro Silva, Luiz Carlos Ruiz Pessenda

01/Feb/2011

The evolution of organic matter sources in soil is related to climate and vegetation dynamics in the past recorded in paleoenvironmental Quaternary deposits such as peatlands. For this reason, a Histosol of the mineralotrophic peatland from the Pau-de-Fruta Special Protection Area – SPA, Espinhaço Meridional, State of Minas Gerais, was described and characterized to evidence the soil constituent materials and properties as related to changes in environmental conditions, supported by the isotopic and elementary characterization of soil C and N […]

Chemistry and genesis of soils developed under restinga vegetation in São Paulo State, Brazil

Maurício Rizzato Coelho, Pablo Vidal-Torrado, Xosé Luiz Otero Pérez, Vanda Moreira Martins, Felipe Macías Vázquez

01/Dec/2010

Restinga is a term currently used for the vegetation on the poor and sandy soils of the coastal plains of Brazil. The soils of these environments have been poorly studied. The counties Cananéia, Ilha Comprida and Bertioga were selected for this research due to the representativeness of the environmental conditions of the state of São Paulo. In these environments 31 soil profiles were described and sampled, many of them in chronosequences. The samples were characterized chemically and analytical evidence converged […]

Soil structure transformations from ferralic to nitic horizons on a toposequence in southeastern Brazil

Miguel Cooper, Pablo Vidal-Torrado, Michel Grimaldi

01/Oct/2010

The soil structure transformation from ferralic to nitic horizons was studied in a toposequence on quaternary red clayey sediments and diabase in Piracicaba (SP), Brazil. Morphological and micromorphological studies, image analysis, soil water characteristic curves and monitoring of (total) soil water potential head were used. The presence of polyconcave vughs, clayskins and planar voids shows that the vertical and lateral transition and structural transformation from ferralic to nitic horizons is given by the coalescence of the microaggregates, probably due to […]

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