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dc.contributor.authorREATTO, A.pt_BR
dc.date.accessioned2011-04-10T11:11:11Zpt_BR
dc.date.available2011-04-10T11:11:11Zpt_BR
dc.date.created2009-05-25pt_BR
dc.date.issued2009pt_BR
dc.identifier.citation2009.pt_BR
dc.identifier.urihttp://www.alice.cnptia.embrapa.br/alice/handle/doc/570960pt_BR
dc.descriptionThe 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.pt_BR
dc.language.isofrafra
dc.rightsopenAccessfra
dc.subjectMicromorfologiapt_BR
dc.subjectPropriedade hidráulica do solopt_BR
dc.subjectMicromorphologypt_BR
dc.subjectSoil hidraulic propertiespt_BR
dc.subjectTermitept_BR
dc.titleNature et propriétés de l'horizon diagnostic de Latosols du Plateau Central brésilien.pt_BR
dc.typeTesespt_BR
dc.date.updated2017-06-29T11:11:11Zpt_BR
dc.subject.thesagroCerradopt_BR
dc.subject.thesagroGeologiapt_BR
dc.subject.thesagroMineralogiapt_BR
dc.subject.thesagroOxisolpt_BR
dc.subject.thesagroSolopt_BR
dc.subject.nalthesaurusgeologypt_BR
dc.subject.nalthesaurusmicrostructurept_BR
dc.subject.nalthesaurusmineralogypt_BR
dc.subject.nalthesaurussoilpt_BR
dc.description.notesTese (Doutorado) - École Doctorale Sciences et Technologies, Université D'Orléans.pt_BR
dc.format.extent2212 p.pt_BR
riaa.ainfo.id570960pt_BR
riaa.ainfo.lastupdate2017-06-29pt_BR
dc.contributor.institutionADRIANA REATTO DOS SANTOS BRAGA, CPAC.pt_BR
Aparece nas coleções:Tese/dissertação (CPAC)

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