Please use this identifier to cite or link to this item: http://www.alice.cnptia.embrapa.br/alice/handle/doc/570960
Research center of Embrapa/Collection: Embrapa Cerrados - Tese/dissertação (ALICE)
Date Issued: 2009
Type of Material: Tese/dissertação (ALICE)
Authors: REATTO, A.
Additional Information: ADRIANA REATTO DOS SANTOS BRAGA, CPAC.
Title: Nature et propriétés de l'horizon diagnostic de Latosols du Plateau Central brésilien.
Publisher: 2009.
Pages: 212 p.
Language: fr
Notes: Tese (Doutorado) - École Doctorale Sciences et Technologies, Université D'Orléans.
Keywords: Micromorfologia
Propriedade hidráulica do solo
Micromorphology
Soil hidraulic properties
Termite.
Description: The Latosols correspond to about 40% of the Brazilian Central Plateau. They are characterized by low activity clay, little horizon differentiation, a weak macrostructure and a strong microgranular structure resulting in microaggregates 50 to 300um in size. Ten Latosols (L) were selected along a 350-km long regional toposequence across the South American Surface (SAS) (L1 to L4) and Velhas Surface (VS) (L5 to L10). The studied Latosols take into account the textural and mineralogical variability, as well as the topographical location and parental material variability. Our results showed a large variation of the kaolinite and gibbsite content in relation to a regional component attributed to the age of the geomorphic surface and a local component mainly related to the hydraulic conditions along the toposequence. The results showed also that the microgranular structure varied without any relationship with the texture and mineralogy of the fine material. It appeared as being mainly related to soil bioturbation by termites. The microaggregates of the Latosols studied are not rigid but shrink during drying with no relation with the mineralogy of the fine material. Our results showed that the microaggregates od the Latosols located on the SAS shrink less than those of the Latosols located on the VS. This would be related to a difference of hydric stress history. Finally, the water retention properties and saturated hydraulic conductivity varied according to the clay content and development of pores larger than 300um in diameter respectively without any apparent role of the mineralogy of the fine material.
Thesagro: Cerrado
Geologia
Mineralogia
Oxisol
Solo.
NAL Thesaurus: geology
mineralogy
microstructure
soil.
Data Created: 2009-05-25
Appears in Collections:Tese/dissertação (CPAC)

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