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• W2897745710 abstract "Magnetic susceptibility measurements at low and high frequencies (<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=M1><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>χ</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant=normal>l</mml:mi><mml:mi mathvariant=normal>f</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>, <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=M2><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>χ</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant=normal>h</mml:mi><mml:mi mathvariant=normal>f</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>) 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 <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=M3><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>χ</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant=normal>l</mml:mi><mml:mi mathvariant=normal>f</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math> 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 <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=M4><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>χ</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant=normal>l</mml:mi><mml:mi mathvariant=normal>f</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>. Measurements of <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=M5><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>χ</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant=normal>l</mml:mi><mml:mi mathvariant=normal>f</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math> 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, <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=M6><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>χ</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant=normal>l</mml:mi><mml:mi mathvariant=normal>f</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math> 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, <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=M7><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>χ</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant=normal>l</mml:mi><mml:mi mathvariant=normal>f</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math> 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 <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=M8><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>χ</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant=normal>l</mml:mi><mml:mi mathvariant=normal>f</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math> and frequency dependent susceptibilities (<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=M9><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>χ</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant=normal>f</mml:mi><mml:mi mathvariant=normal>d</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math> and %<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=M10><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>χ</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant=normal>f</mml:mi><mml:mi mathvariant=normal>d</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>), along the profiles of soil, indicate a pedogenic origin of the topsoil magnetic susceptibility enhancement." @default.
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• W2897745710 date "2018-10-18" @default.
• W2897745710 modified "2023-09-26" @default.
• W2897745710 title "Assessing Magnetic Susceptibility Profiles of Topsoils under Different Occupations" @default.
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