Clay mineral composition drives soil structure behavior and the associated physical properties in Brazilian Oxisols

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MetadadosDescriçãoIdioma
Autor(es): dc.contributorUniversidade de São Paulo (USP)-
Autor(es): dc.contributorUniversidade Estadual Paulista (UNESP)-
Autor(es): dc.contributorUniversity of Florida-
Autor(es): dc.contributorUniversity of Kassel-
Autor(es): dc.contributorLeibniz University Hannover-
Autor(es): dc.creatorPessoa, Thaís Nascimento-
Autor(es): dc.creatorBovi, Renata Cristina-
Autor(es): dc.creatorNunes, Márcio Renato-
Autor(es): dc.creatorCooper, Miguel-
Autor(es): dc.creatorUteau, Daniel-
Autor(es): dc.creatorPeth, Stephan-
Autor(es): dc.creatorLibardi, Paulo Leonel-
Data de aceite: dc.date.accessioned2025-08-21T16:31:39Z-
Data de disponibilização: dc.date.available2025-08-21T16:31:39Z-
Data de envio: dc.date.issued2025-04-29-
Data de envio: dc.date.issued2024-09-01-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.1016/j.geodrs.2024.e00837-
Fonte completa do material: dc.identifierhttps://hdl.handle.net/11449/309237-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/309237-
Descrição: dc.descriptionSoil aggregation controls several physical, chemical, and biological processes. Soil organic matter (SOM) and its stabilizing agents are regarded as the most important factors driving formation and stabilization of soil aggregates. However, aggregate stability in highly weathered soils may also be related to clay mineral composition and soil chemical properties. This study aims to evaluate the processes controlling soil aggregate stability and to understand the influence of soil chemical and clay mineral composition on the structural stability of highly weathered soils. Four Brazilian Oxisols were investigated: (P1) Xanthic Kandiustox, (P2) Rhodic Haplustox, (P3) Anionic Acrustox, and (P4) Typic Hapludox. Undisturbed and disturbed soil samples were collected from the Bw horizon under a native forest. Soil structural stability was evaluated using a variety of techniques and indices, including mean weight diameter (MWD) by hydraulic stress, mechanically-dispersible clay (MDC) by turbidimetry, tensile strength (TS) by crushing aggregates, and soil structural stability index (SSI) taking into account soil organic carbon (SOC). In general, P1 exhibited the highest MDC content (3.05 ± 0.54, Nephelometric Turbidity Unit, NTU/g L-−1), while P4 had the highest MWD (10.26 ± 0.24 mm) and the highest TS (80.42 ± 18.54 kPa) within the 8–4 mm aggregate size class. The TS for the 4–2 mm and 2–1 mm aggregate size classes was found to be equal for P2 and P4, with values ranging from 158.17 ± 24.70 kPa to 148.04 ± 38.50 kPa in the 4–2 mm class, and from 459.51 ± 189 kPa to 328.35 ± 78.22 kPa in the 2–1 mm one. The SSI was found to be inadequate for evaluating the structural stability of the Oxisols. In general, SOC was found to be the main stabilizing agent of larger aggregates, while clay mineral composition determined the stability of smaller aggregates. Goethite associated with gibbsite was more effective in increasing the structural stability of P2 and P4. Furthermore, kaolinites with low crystallinity, which are found in clayey Oxisols, resulted in a high specific surface area, particularly in Rhodic Haplustox and Typic Hapludox soils, which promoted more interactions with other clay minerals (e.g., goethite and gibbsite) and SOC, thereby increasing the tensile strength in these Oxisols. In fact, the formation and stabilization of aggregates in highly weathered soils depends on several factors, but the influence of clay mineral composition stands out as the most pronounced.-
Descrição: dc.descriptionCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)-
Descrição: dc.descriptionUniversität Kassel-
Descrição: dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)-
Descrição: dc.descriptionDepartment of Soil Science “Luiz de Queiroz” College of Agriculture University of São Paulo, Pádua Dias Avenue 11, São Paulo-
Descrição: dc.descriptionSão Paulo State University School of Agriculture Department of Forest Science Soils and Environment, Av. Universitária, 3780, São Paulo-
Descrição: dc.descriptionDepartment of Soil Water and Ecosystem Sciences and Global Food Systems Institute University of Florida-
Descrição: dc.descriptionDepartment of Soil Science Faculty of Ecological Agriculture University of Kassel, Nordbahnhofstr. 1a-
Descrição: dc.descriptionInstitute of Earth System Sciences Section Soil Science Leibniz University Hannover, Herrenhäuser Str. 2-
Descrição: dc.descriptionSão Paulo State University School of Agriculture Department of Forest Science Soils and Environment, Av. Universitária, 3780, São Paulo-
Descrição: dc.descriptionCNPq: #140126/2017-1-
Idioma: dc.languageen-
Relação: dc.relationGeoderma Regional-
???dc.source???: dc.sourceScopus-
Palavras-chave: dc.subjectIron and aluminum oxides-
Palavras-chave: dc.subjectMean weight diameter-
Palavras-chave: dc.subjectMechanically-dispersible clay-
Palavras-chave: dc.subjectSoil organic matter-
Palavras-chave: dc.subjectTensile strength-
Título: dc.titleClay mineral composition drives soil structure behavior and the associated physical properties in Brazilian Oxisols-
Tipo de arquivo: dc.typelivro digital-
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