EGU2020-21978
https://doi.org/10.5194/egusphere-egu2020-21978
EGU General Assembly 2020
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Integrated analysis of multi-scale electrical signatures for characterizing soil water dynamics in century-old biochar enriched agroecosystems

Edmundo Placencia-Gomez1, Victor Burgeon2, Ramin Heidarian-Dehkordi2, Jeroen Meersmans2, Mihai Cimpoiasu3, Julien Fouché4, Frederic Nguyen1, Jean-Thomas Cornelis2, and Sarah Garré2
Edmundo Placencia-Gomez et al.
  • 1Département ArGEnCo/Géophysique appliquée, Liège University, Liège, Belgium (eplacencia@uliege.be)
  • 2Gembloux Agro Bio Tech (GxABT), TERRA, Liège University, Gembloux, Belgium
  • 3Division of Agriculture and Environmental Sciences, University of Nottingham, Sutton Bonington, Leicestershire, UK
  • 4LISAH, INRAE, IRD, Montpellier SupAgro, Montpellier University, Montpellier, France

Electrical resistivity and induced polarization tomography and electromagnetic induction are widely used in hydrogeophysical applications. In this work we perform a multi-scale analysis of DC-resistivity, spectral induced polarization (SIP) and electromagnetic induction (EMI) measurements to evaluate soil water dynamics of a century-old biochar enriched agroecosystem. Our study aims at comparing the spatio-temporal variations of the electrical signature (resistivity or conductivity) between the natural (reference) soil and soil enriched with biochar visible as black patches ( 0.30 m thick x 20 m of diameter) in the study area and relate this signature to a soil moisture status. In this first overall and qualitative approach we combine 1) field large-scale time-lapse electrical resistivity tomography (ERT) transects (12.6 m) and EMI conductivity maps covering the whole study area (13 ha), 2) intermediate-scale ERT/SIP profiles from on-site pits (2 m L x 1 m W x 1 m D), and 3) laboratory columns-scale (0.10 m L x 0.044 m ID) SIP signatures of undisturbed soil samples.

Large-scale results show a heterogeneous-resistive soil top horizon in both soil types, but with similar hydrodynamic behaviour following precipitation events. The column scale SIP signatures reveal that texture and pore structure are the main driver of soil moisture dynamics with insignificant role of the biochar content. Large and intermediate scale monitoring campaigns during the entire growing season of two different crops are planned for the current and next year. The ultimate objective is to quantify the effect of century-old biochar on soil water dynamics and root water uptake.

How to cite: Placencia-Gomez, E., Burgeon, V., Heidarian-Dehkordi, R., Meersmans, J., Cimpoiasu, M., Fouché, J., Nguyen, F., Cornelis, J.-T., and Garré, S.: Integrated analysis of multi-scale electrical signatures for characterizing soil water dynamics in century-old biochar enriched agroecosystems, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-21978, https://doi.org/10.5194/egusphere-egu2020-21978, 2020

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