Soil structure transformations from ferralic to nitic horizons on a toposequence in southeastern Brazil

Revista Brasileira de Ciência do Solo

Miguel Cooper²  Pablo Vidal-torrado¹  Michel Grimaldi¹ 

[1] ,USP ESALQ Departamento de Ciência do SoloPiracicaba SP ,Brasil

关键词: Ferralsols;    Nitisols;    soil micromorphology;    image analysis;    soil water dynamics;    Latossolo;    Nitossolo;    micromorfologia do solo;    análise de imagens;    dinâmica da água no solo;   

DOI  :  10.1590/S0100-06832010000500021

来源: SciELO

【 摘 要 】

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.

【 授权许可】

CC BY   
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