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Pablo Vidal-Torrado ; Michel Grimaldi ;Revista Brasileira de Ciência do Solo 2010, 34 5

Autor: Miguel Cooper

Fuente: http://www.redalyc.org/


Introducción



Revista Brasileira de Ciência do Solo ISSN: 0100-0683 revista@sbcs.org.br Sociedade Brasileira de Ciência do Solo Brasil Cooper, Miguel; Vidal-Torrado, Pablo; Grimaldi, Michel SOIL STRUCTURE TRANSFORMATIONS FROM FERRALIC TO NITIC HORIZONS ON A TOPOSEQUENCE IN SOUTHEASTERN BRAZIL Revista Brasileira de Ciência do Solo, vol.
34, núm.
5, 2010, pp.
1685-1699 Sociedade Brasileira de Ciência do Solo Viçosa, Brasil Available in: http:--www.redalyc.org-articulo.oa?id=180215650021 How to cite Complete issue More information about this article Journals homepage in redalyc.org Scientific Information System Network of Scientific Journals from Latin America, the Caribbean, Spain and Portugal Non-profit academic project, developed under the open access initiative SOIL STRUCTURE TRANSFORMATIONS FROM FERRALIC TO NITIC HORIZONS. 1685 SEÇÃO V - GÊNESE, MORFOLOGIA E CLASSIFICAÇÃO DO SOLO SOIL STRUCTURE TRANSFORMATIONS FROM FERRALIC TO NITIC HORIZONS ON A TOPOSEQUENCE IN SOUTHEASTERN BRAZIL(1) Miguel Cooper(2), Pablo Vidal-Torrado(3) & Michel Grimaldi(4) ABSTRACT 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 tensions created in a drier period in the past.
Changes to a more humid climate with a defined dry season and alternate drying and wetting cycles resulted in the fissuration of the previously coalesced material, forming polyhedral aggregates and microaggregates.
Simultaneously, clay illuviation filled the voids and together with the compacting acti...





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