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Assessing Magnetic Susceptibility Profiles of Topsoils under Different Occupations

2018; Hindawi Publishing Corporation; Volume: 2018; Linguagem: Inglês

10.1155/2018/9481405

1687-8868

Naima Bouhsane, S. Bouhlassa,

Geophysical and Geoelectrical Methods

Magnetic susceptibility measurements at low and high frequencies ( χ l f , χ h f ) were carried out on topsoil samples from reforested, cultivated, and pasture lands from a catchment located at the north of Morocco. The aims of this study were to investigate the impact of land use or human activity on χ l f of soil overlying the same substrate, to discriminate allochthonous material or pollution from autochthonous or inherited ones, and to assess the origin and contribution of superparamagnetic (SP) grains to the global magnetic susceptibility χ l f . Measurements of χ l f indicated significant enhancement, with values ranging from 12.4 to 252.82 × 10 -8 m 3 kg −1 with a mean value of 107.087 × 10 -8 m 3 kg −1 for the reforested lands. In the cultivated lands, χ l f were from 8.4 to 88.65 × 10 -8 m 3 kg 1 with a mean value of 42.69 × 10 -8 m 3 kg −1 , while in the pasture lands, χ l f was comprised between 14.34 × 10 -8 m 3 kg −1 and 133.35 × 10 -8 m 3 kg −1 with a mean value of 57.33 × 10 -8 m 3 kg −1 . The magnetic enhancement indicates high concentration of ferrimagnetic minerals in the top soil. The magnetic susceptibility enhancement decreases as the human activity increases, while the underlying bedrock is almost the same: reforested land > pastures land > cultivated land. The analysis of the variations of χ l f and frequency dependent susceptibilities ( χ f d and % χ f d ), along the profiles of soil, indicate a pedogenic origin of the topsoil magnetic susceptibility enhancement.