Full text
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| Author(s): |
André Mateus Barreiros
Total Authors: 1
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| Document type: | Master's Dissertation |
| Press: | São Paulo. |
| Institution: | Universidade de São Paulo (USP). Faculdade de Filosofia, Letras e Ciências Humanas (FFLCH/SBD) |
| Defense date: | 2013-06-25 |
| Examining board members: |
Déborah de Oliveira;
Adilson Avansi de Abreu;
Paulo Nakashima
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| Advisor: | Déborah de Oliveira |
| Abstract | |
The goal of the present research is to show which pedogenetic processes take place in the genesis and evolution of soils in the northwest of the state of Paraná, aiming specifically on the formation of nitic horizons on top of latosolic horizons in a basaltic area, inserted in a lithological transition zone, between basalts and sandstones. The study area is the Gurupá Creek hydrographical basin, located in Floraí - PR. In this process, photointerpretation techniques and procedures were used for the geological survey, in order to elucidate the substratum´s distribution, landforms and associated soils. The final cartographic product is a Morpholithological Map. The Structural Analysis of the Pedological Coverage supplied us with the procedures which allowed the multi-scalar analysis of the organization and dynamics of the soil coverage. The pedological system studied in this research presents a sandy superficial volume, and an increase in clay content in the subsuperficial volumes, organized in polyhedral blocks or microaggregated structure, clearly distinguishable during the field work; the analysis of the physical and chemical parameters revealed a morphological difference between the quartz grains in depth and heterogeneous concentration of elements and oxides in the studied profiles. With the support of different concepts, techniques and procedures of soil micromorphology, we demonstrated that an intense geochemical dissolution of the quartz grains is currently taking place, in the form of dissolution gulfs, abundant plasmic separations in the contact of the sandy and argilic volumes, with an evolution in depth and intense illuviated clay accumulation in the subsurface, causing the reorganization of the microaggregated structure in polyhedral blocks, with an ascending evolution. In synthesis, this system evolves through the transportation of matter, which promotes reorganizations within the pedological coverage (elluviation/illuviation), indicating that the area is going through a period of pedobioclimatic imbalance. (AU) | |
| FAPESP's process: | 10/03397-0 - STUDY OF THE GENESIS OF A RED FERRIC LATOSOLIC NITISOL IN AN AREA OF LITOLOGICAL INTERFACE, IN THE MUNICIPALITY OF FLORAÍ, STATE OF PARANÁ, BRAZIL. |
| Grantee: | André Mateus Barreiros |
| Support Opportunities: | Scholarships in Brazil - Master |