Geochemical modeling on Holocene/Pleistocene Hydropedological conditions of sodic soils in north Pantanal, Brazil

• Grant number: 13/17766-6
• Support type: Scholarships abroad - Research Internship - Doctorate
• Effective date (Start): November 01, 2013
• Effective date (End): April 30, 2014
• Field of knowledge: Agronomical Sciences - Agronomy - Soil Science
• Principal Investigator: Pablo Vidal Torrado
• Grantee: Jairo Calderari de Oliveira Junior
• Supervisor abroad: Vincent Valles
• Home Institution: Escola Superior de Agricultura Luiz de Queiroz (ESALQ). Universidade de São Paulo (USP). Piracicaba , SP, Brazil
• Local de pesquisa : Université d'Avignon et des Pays de Vaucluse, France
• Associated to the scholarship: 11/11905-9 - Spatial characterization and genesis of sodic soil in the region of Barão do Melgaço, Pantanal Mato-Grossense, BP.DR

Abstract

The occurrence of sodic soils in higher ground in northern Pantanal had been an awkward situation, because sodic soils typically occur in the lowest part of landscape in arid or semiarid regions rather than wetlands. Our research suggests that these sodic soils have formed under other environmental conditions occurring ~5.000 yr BP, and have partially been maintained until nowadays, on the upper parts of the landscape. Based on mineralogical, micromorphological and geochemical considerations the sodic soil formation have originated from the concentration of diluted river water. The concentration process provokes a control of Ca2+ and Mg2+ in the solution, and favours higher sodium proportion. Twos majors rivers with contrasted chemical profiles significantly influence in the study area: the São Lourenço River and the Cuiabá river. The objective of the PhD schorlaship in Avignon (France) is fourfolds:To analyse the chemical variability in sodic soil solutions;To identify the main processes responsible for the chemical variabilityTo consider the solution/mineral equilibrium To simulate the concentration/dilution of the various types of water.This work will be developed in the "Laboratoire d'hydrogéologie Appliquée" at the university of "Avignon et Pays de Vaucluse", France, under the supervision of Prof. Vincent Valles. The modeling results will points out which river originated sodic soils and wich minerals were produced through concentration process, reconstituting the paleoenviroments and better understanding the actual hydropedologic equilibrium. (AU)

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

OLIVEIRA JUNIOR, JAIRO C.; FURQUIM, SHEILA A. C.; NASCIMENTO, ALEXANDRE F.; BEIRIGO, RAPHAEL M.; BARBIERO, LAURENT; VALLES, VINCENT; COUTO, EDUARDO G.; VIDAL-TORRADO, PABLO. Salt-affected soils on elevated landforms of an alluvial megafan, northern Pantanal, Brazil. CATENA, v. 172, p. 819-830, JAN 2019. Web of Science Citations: 2.