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https://doi.org/10.5194/soil-2020-33
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/soil-2020-33
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: original research article 15 Jun 2020

Submitted as: original research article | 15 Jun 2020

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This preprint is currently under review for the journal SOIL.

Comparison of soil characteristics from geophysical and geochemical techniques along a climate and ecological gradient, Chilean Coastal Cordillera (26° to 38° S)

Mirjam Schaller1, Igor Dal Bo2, Todd Alan Ehlers1, Anja Klotzsche2, Reinhard Drews1, Juan Pablo Fuentes Espoz3, and Jan van der Kruk2 Mirjam Schaller et al.
  • 1Department of Geosciences, University of Tübingen, Schnarrenbergstrasse 94-96, 72076 Tübingen, Germany
  • 2Agrosphere (IBG-3), Institute of Bio-and Geosciences, Forschungszentrum Jülich, 52428, Jülich, Germany
  • 3University of Chile, Department of Silviculture and Nature Conservation, Av. Santa Rosa 11315, La Pintana, Santiago RM, Chile

Abstract. In this study, we combine geophysical observations from Ground Penetrating Radar (GPR) with soil physical, and geochemical properties from pedons excavated in four study areas spanning 1,300 km of the climate and ecological gradient in the Chilean Coastal Cordillera. Our aims are to: (1) relate GPR observations to depth varying soil physical and weathering-related chemical properties in adjacent pedons, and (2) evaluate the lateral extent to which these properties can be extrapolated along a hillslope using GPR observations. Physical observations considered include soil bulk density and grain size distribution whereas chemical observations are based on major and trace element analysis. Results indicate that visually-determined soil thickness and the transition from the soil B to C horizons generally correlate with maximums in the 500 and 1000 MHz GPR envelope profiles. To a lesser degree, these maximums in the GPR envelope profiles agree with maximums in weathering related indices such as the Chemical Index of Alteration (CIA) and the chemical index of mass transfer (τ) for Na. Finally, we find that up-scaling from the pedon to hillslope scale is possible with geophysical methods for certain pedon properties available. Taken together, these findings suggest that the GPR profiles along hillslopes can be used to infer lateral thickness variations in soil horizons, and to some degree the physical and chemical variations with depth.

Mirjam Schaller et al.

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Mirjam Schaller et al.

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Short summary
In this study geophysical observations from Ground Penetrating Radar with soil physical and geochemical properties from pedons excavated in four study areas of the climate and ecological gradient in the Chilean Coastal Cordillera are combined. Findings suggest that profiles with Ground Penetrating Radar along hillslopes can be used to infer lateral thickness variations in soil horizons, and to some degree physical and chemical variations with depth.
In this study geophysical observations from Ground Penetrating Radar with soil physical and...
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