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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Clay mineralogy and magnetic susceptibility of Oxisols in geomorphic surfaces

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Autor(es):
Camargo, Livia Arantes [1] ; Marques Junior, Jose [1] ; Pereira, Gener Tadeu [1] ; Rabelo de Souza Bahia, Angelica Santos [1]
Número total de Autores: 4
Afiliação do(s) autor(es):
[1] Sao Paulo State Univ, FCAV, BR-14884900 Jaboticabal, SP - Brazil
Número total de Afiliações: 1
Tipo de documento: Artigo Científico
Fonte: Scientia Agricola; v. 71, n. 3, p. 244-256, MAY-JUN 2014.
Citações Web of Science: 22
Assunto(s):Hematita
Resumo

Studies analyzing the variability of clay minerals and magnetic susceptibility provide data for the delineation of site-specific management areas since many of their attributes are important to agronomy and the environment. This study aimed to evaluate the spatial variability of clay minerals, magnetic susceptibility, adsorbed phosphorus and physical attributes in Oxisols of sandstones in different geomorphic surfaces. For that purpose, soil samples were collected every 25 m along a transect located within the area where the geomorphic surfaces were identified and mapped. The transect occupied the central portion of 500 ha, where it was also sampled for density purposes with one sample per six hectares. Soil samples were collected at a depth of 0.0-0.2 m. The results of the physical, chemical, mineralogical and magnetic susceptibility analyses were subjected to statistical and geostatistical analyses. The nature of the clay minerals and magnetic susceptibility was dependent on the variation of the soil parent material. High values of magnetic susceptibility were associated with the presence of maghemite and magnetite of coarse size. The spatial variability of crystallinity and the content of Fe oxides, as well as magnetic susceptibility, were dependent on the age of the geomorphic surfaces. The youngest surface had greater spatial variability of these attributes. The iron (goethite and hematite) and aluminum (gibbsite) oxides in the youngest geomorphic surface influenced the low values of soil density and high values of total pore volume, micropores and P adsorption. The characterization of the spatial variability of Fe oxides and susceptibility allowed for the delineation of homogeneous areas. (AU)

Processo FAPESP: 09/05995-5 - Variabilidade espacial da mineralogia da fração argila e relações com atributos físicos e químicos de latossolos em diferentes superfícies geomórficas
Beneficiário:José Marques Júnior
Linha de fomento: Auxílio à Pesquisa - Regular
Processo FAPESP: 09/06834-5 - Mineralogia da argila por difração de raios x e espectroscopia de reflectância difusa em latossolos sob diferentes superfícies geomórficas
Beneficiário:Livia Arantes Camargo
Linha de fomento: Bolsas no Brasil - Doutorado