Abstract
The interest in new techniques to support digital soil mapping (DSM) is increasing. Numerous studies pointed out that the measure of magnetic susceptibility (MS) can be extremely useful in the identification of properties related with factors and processes of soil formation, applied to soil mapping. This study addressed the effectiveness of magnetic soil susceptibility to identify and facilitate the distinction of different pedogenic environments of a representative hillslope in the highland Planalto Médio in the state of Rio Grande do Sul (RS), Brazil. In a 350-ha area in the municipality of Santo Augusto, RS, a representative transect was selected, trenches opened for soil characterization and 29 grid points marked at regular distances of 50 m, where soil samples were collected (layers 0.00-0.05, 0.05-0.15, 0.15-0.30, and 0.30-0.60 m) to analyze soil properties. Data from the transect samples were subjected to descriptive statistics. Limits of the pedogenetic environments along the slope were identified by the Split Moving Window (SMW) Boundary Analysis. The combined use of soil magnetic susceptibility and the SMW technique was effective in identifying different pedogenetic environments in the study area.
Highlights
Magnetic susceptibility (MS) is a measure that indicates to which degree a material is magnetizable, and is directly related to the compounds of this material (Dearing, 1999)
This study addressed the effectiveness of magnetic soil susceptibility to identify and facilitate the distinction of different pedogenic environments of a representative hillslope in the highland Planalto Médio in the state of Rio Grande do Sul (RS), Brazil
Studies on the magnetic variability of Oxisols at locations with a total iron content between 4 and 13 % associated the variation in MS to magnetite derived from the source material and to ferromagnetic maghemite and ferrihydrite formed in different pedogenetic environments (Camargo et al, 2014)
Summary
Magnetic susceptibility (MS) is a measure that indicates to which degree a material is magnetizable, and is directly related to the compounds of this material (Dearing, 1999). Studies on the magnetic variability of Oxisols at locations with a total iron content between 4 and 13 % associated the variation in MS to magnetite derived from the source material and to ferromagnetic maghemite and ferrihydrite formed in different pedogenetic environments (Camargo et al, 2014) Along this same line, Marques Jr. et al (2014) analyzed a sandy Haplustalf with low total iron content (
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