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Using magnetic susceptibility mapping for assessing soil degradation due to water erosion

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    0458600 - GFU-E 2017 RIV CZ eng J - Journal Article
    Jakšík, O. - Kodešová, R. - Kapička, Aleš - Klement, A. - Fér, M. - Nikodém, A.
    Using magnetic susceptibility mapping for assessing soil degradation due to water erosion.
    Soil & Water Research. Roč. 11, č. 2 (2016), s. 105-113. ISSN 1801-5395
    R&D Projects: GA MZe QJ1230319
    Institutional support: RVO:67985530
    Keywords : arable land * geomorphologically diverse areas * Chernozem
    Subject RIV: DE - Earth Magnetism, Geodesy, Geography
    Impact factor: 0.934, year: 2016

    This study focused on developing a method for estimating topsoil organic carbon content from measured mass-specific magnetic susceptibility in Chernozems heavily affected by water erosion. The study was performed on a 100 ha area, whereby 202 soil samples were taken. A set of soil samples was divided into 3 subsets: A (32 samples), B (67 samples), and C (103 samples). The mass-specific magnetic susceptibility using low and high frequency, and organic carbon content were measured at all soil samples. The contents of iron and manganese, extracted with a dithionite-citrate solution (Fed, Mnd) and ammonium oxalate (Feo, Mno), were quantified in A and B samples. Models for predicting organic carbon content from magnetic susceptibilities were designed as follows: (1) subset A was used as the training set for calibration, and subsets B and C were used as the test sets for model validation, either separately (subset B only), or together (merged subsets B and C); (2) merged subsets A and B were used as the training set and subset C was used as the test set. Results showed very close correlations between organic carbon content and all measured soil properties. Obtained models relating organic carbon content to mass-specific magnetic susceptibility successfully predicted soil organic carbon contents.
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