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| Titel |
Influence of plant roots on electrical resistivity measurements of
cultivated soil columns |
| VerfasserIn |
Sophie Maloteau, Guillaume Blanchy, Mathieu Javaux, Sarah Garré |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250131301
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| Publikation (Nr.) |
 EGU/EGU2016-11695.pdf |
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| Zusammenfassung |
| Electrical resistivity methods have been widely used for the last 40 years in many fields:
groundwater investigation, soil and water pollution, engineering application for subsurface
surveys, etc. Many factors can influence the electrical resistivity of a media, and thus
influence the ERT measurements. Among those factors, it is known that plant roots
affect bulk electrical resistivity. However, this impact is not yet well understood.
The goals of this experiment are to quantify the effect of plant roots on electrical
resistivity of the soil subsurface and to map a plant roots system in space and time
with ERT technique in a soil column. For this research, it is assumed that roots
system affect the electrical properties of the rhizosphere. Indeed the root activity (by
transporting ions, releasing exudates, changing the soil structure,…) will modify
the rhizosphere electrical conductivity (Lobet G. et al, 2013). This experiment is
included in a bigger research project about the influence of roots system on geophysics
measurements.
Measurements are made on cylinders of 45 cm high and a diameter of 20 cm,
filled with saturated loam on which seeds of Brachypodium distachyon (L.) Beauv.
are sowed. Columns are equipped with electrodes, TDR probes and temperature
sensors.
Experiments are conducted at Gembloux Agro-Bio Tech, in a growing chamber with
controlled conditions: temperature of the air is fixed to 20˚ C, photoperiod is equal to
14 hours, photosynthetically active radiation is equal to 200 μmol m−2s−1, and
air relative humidity is fixed to 80 %. Columns are fully saturated the first day
of the measurements duration then no more irrigation is done till the end of the
experiment.
The poster will report the first results analysis of the electrical resistivity distribution in
the soil columns through space and time. These results will be discussed according to the
plant development and other controlled factors. Water content of the soil will also be
detailed.
Reference
Lobet G, Hachez C, Chaumont F, Javaux M, Draye X. Root water uptake and water flow
in the soil-root domain. In: Eshel A and Beeckman T, editors. Plant Roots. The Hidden Half.
Boca Raton (US):CRC Press,2013. p. 24-1—24-13. |
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