SciELO - Scientific Electronic Library Online

 
vol.34 número5Volatilização de amônia em plantio direto na região centro-sul do ParanáProporção e tamanho de sedimentos e teor de carbono orgânico na enxurrada e no solo para dois cultivos e duas formas de semeadura índice de autoresíndice de assuntospesquisa de artigos
Home Pagelista alfabética de periódicos  

Serviços Personalizados

Journal

Artigo

Indicadores

Links relacionados

Compartilhar


Revista Brasileira de Ciência do Solo

versão On-line ISSN 1806-9657

Resumo

COOPER, Miguel; VIDAL-TORRADO, Pablo  e  GRIMALDI, Michel. Soil structure transformations from ferralic to nitic horizons on a toposequence in southeastern Brazil. Rev. Bras. Ciênc. Solo [online]. 2010, vol.34, n.5, pp.1685-1699. ISSN 1806-9657.  http://dx.doi.org/10.1590/S0100-06832010000500021.

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 action of the biological activity of these soils contributed to the coalescence of microaggregates.

Palavras-chave : Ferralsols; Nitisols; soil micromorphology; image analysis; soil water dynamics.

        · resumo em Português     · texto em Inglês     · Inglês ( pdf )

 

Creative Commons License Todo o conteúdo deste periódico, exceto onde está identificado, está licenciado sob uma Licença Creative Commons