• en
  • pt-br

All publications of “Miguel Cooper”

19 results

Sediment Morphology, Distribution, and Recent Transport Dynamics in a Reforested Fragment

Renata Cristina Bovi, Laura Fernanda Simões da Silva, Mariana Delgado Oliveira Zenero, Camila Carolina de Carvalho, Miguel Cooper

01/Aug/2017

Abstract Erosion generates large amounts of sediment, which may be deposited at the site of origin, on the slope of a hill, or along waterways. The transportability of each type of sediment by runoff and its potential for subsequent deposition largely depends on its morphological features and particle size distribution. The aim of this study is to describe and characterize the morphology and micromorphology of sediments deposited in a reforested area and to understand the dynamics of the transport process. […]

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. […]

Characterization and Classification of Soils under Forest and Pasture in an Agroextractivist Project in Eastern Amazonia

Mariana Delgado Oliveira Zenero, Laura Fernanda Simões da Silva, Selene Cristina de Pierri Castilho, Alix Vidal, Michel Grimaldi, Miguel Cooper

09/Dec/2016

ABSTRACT: Knowledge of soils in the Amazon rainforest is becoming increasingly essential due to dynamics adopted by farmers that substitute forest for pastures, together with growing pressure from diverse segments of society towards adoption of sustainable production systems. The objective of this study was to characterize the soils along two toposequences, one under forest (F) and the other under pasture (P), and to verify how the change in land use influences soil attributes, evaluating their inclusion in the Brazilian Soil […]

Genesis of Soils Formed from Mafic Igneous Rock in the Atlantic Forest Environment

Adailde do Carmo Santos, Marcos Gervasio Pereira, Lúcia Helena Cunha dos Anjos, Thiago Andrade Bernini, Miguel Cooper

06/Jun/2016

ABSTRACT Different parent materials participate in the formation of soils in the hilly landscape of “Mar de Morros” in the Atlantic Forest environment. Those derived from mafic igneous rock (gabbro) frequently show erosion problems because of land use, which is aggravated by the mountainous relief and soil attributes. This study evaluated the main pedogenic processes of soils formed from mafic igneous rock (gabbro) in a toposequence in Pinheiral (RJ) by characterizing physical, chemical, mineralogical and micromorphological attributes. The profiles are […]

SOIL STRUCTURE UNDER IRRIGATED BEANS AND DIFFERENT SOIL MANAGEMENT PRACTICES

Lorena Adriana de Gennaro, Zigomar Menezes de Souza, Laura Fernanda Simões da Silva, Miguel Cooper, Milton César Costa Campos

01/Mar/2015

Agricultural management affects soil structure, modifying soil physical properties and soil water movement. The objective of this study was to evaluate the effects of no-tillage (NT) and conventional tillage (CT) on soil structure through physical properties and pore distribution in 2-D digital images. The study was conducted in an Oxisol with a randomized block design. Soil bulk density, soil macroporosity, mean weighted diameter (MWD), saturated hydraulic conductivity (SHC), and analysis of 2-D digital images (156.25 μm2 resolution) were evaluated at […]

MORPHOLOGICAL AND MICROMORPHOLOGICAL CHANGES IN THE STRUCTURE OF A RHODIC HAPLUDOX AS A RESULT OF AGRICULTURAL MANAGEMENT

Laura Fernanda Simões da Silva, Mara de Andrade Marinho, Edson Eiji Matsura, Miguel Cooper, Ricardo Ralisch

01/Jan/2015

In evaluation of soil quality for agricultural use, soil structure is one of the most important properties, which is influenced not only by climate, biological activity, and management practices but also by mechanical and physico-chemical forces acting in the soil. The purpose of this study was to evaluate the influence of conventional agricultural management on the structure and microstructure of a Latossolo Vermelho distroférrico típico (Rhodic Hapludox) in an experimental area planted to maize. Soil morphology was described using the […]

Assessment of pedotransfer functions for estimating soil water retention curves for the amazon region

João Carlos Medeiros, Miguel Cooper, Jaqueline Dalla Rosa, Michel Grimaldi, Yves Coquet

01/Jun/2014

Knowledge of the soil water retention curve (SWRC) is essential for understanding and modeling hydraulic processes in the soil. However, direct determination of the SWRC is time consuming and costly. In addition, it requires a large number of samples, due to the high spatial and temporal variability of soil hydraulic properties. An alternative is the use of models, called pedotransfer functions (PTFs), which estimate the SWRC from easy-to-measure properties. The aim of this paper was to test the accuracy of […]

Evaluation of physical quality indices of a soil under a seasonal semideciduous forest

Thalita Campos Oliveira, Laura Fernanda Simões da Silva, Miguel Cooper

01/Apr/2014

The concept of soil quality is currently the subject of great discussion due to the interaction of soil with the environment (soil-plant-atmosphere) and practices of human intervention. However, concepts of soil quality relate quality to agricultural productivity, but assessment of soil quality in an agronomic context may be different from its assessment in natural areas. The aim of this study was to assess physical quality indices, the S index, soil aeration capacity (ACt/Pt), and water storage capacity (FC/Pt) of the […]

Genesis and classification of soils in a toposequence of karst in Serra da Bodoquena (MS)

Marlen Barros e Silva, Lúcia Helena Cunha dos Anjos, Marcos Gervasio Pereira, Jolimar Antônio Schiavo, Miguel Cooper, Rafael de Souza Cavassani

01/Dec/2013

Despite their importance and vulnerability, little is known about the soils in the calcareous karst systems in Brazil. The objective of this study was to evaluate the genesis of soils formed from calcareous parent materials and to characterize their properties, as a contribution to the Brazilian Soil Classification System (SiBCS). Three profiles located at footslope (P1), backslope (P2) and summit (P3) positions in a toposequence with slightly undulated relief, were studied in the Serra da Bodoquena, Mato Grosso do Sul […]

Influence of tillage systems and simulated rainfall on the process of surface crust formation

Jaqueline Dalla Rosa, Miguel Cooper, Frédéric Darboux, João Carlos Medeiros

01/Apr/2013

On the soil surface, rainfall modifies the soil surface structure promoting crust development. This study evaluated the dynamics of soil crusting, through description and micromorphological analysis of thin sections in 2009 and 2010. In 15 x 30 m plots, the management systems conventional tillage (CT), reduced tillage (RT) and no tillage (NT) were assessed. Within the plots, 1 x 1 m micro-plots were installed to test different levels of simulated rainfall (0, 27, 54, and 80 mm) at an intensity […]

1 2