Mapping tree root system in dikes using induced polarization: Focus on the influence of soil water content

Mary, Benjamin; Saracco, Ginette; Peyras, Laurent; Vennetier, M.; Mériaux, Patrice; Camerlynck, Christian

doi:10.1016/j.jappgeo.2016.05.005

Cited by 21 publications

(22 citation statements)

References 36 publications

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“…So far, these effects are not well documented. On the other hand, water uptake by fine roots may dry the soil and increase the contrast of resistivity at the interface between soil and roots and thus the potential to detect coarse roots in a low resistivity soil (Mary et al, 2017). Also, the phase is affected by the non-uniform initial distribution of water content.…”

Section: Consistency Of Laboratory and In-situ Resultsmentioning

confidence: 99%

“…Benjamin Mary et al (2017) Improvement of coarse root detection using time and frequency induced polarization: from laboratory to field experiments, Plant and Soil, in press. DOI: 10.1007/s11104-017-3255-4, http://rdcu.be/rKdZ effects of the soil in comparison to the root sample predominated on the phase amplitude between 4 and 40 Hz, and for all frequencies above 200 Hz.…”

Section: Measurement On Root and Soil Samplementioning

confidence: 99%

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Improvement of coarse root detection using time and frequency induced polarization: from laboratory to field experiments

et al. 2017

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Section: Consistency Of Laboratory and In-situ Resultsmentioning

confidence: 99%

Section: Measurement On Root and Soil Samplementioning

confidence: 99%

Improvement of coarse root detection using time and frequency induced polarization: from laboratory to field experiments

et al. 2017

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“…This shift is dependent on some specific plant parameters, and its assessment could also contribute to better discriminating root and soil current conduction. Mary et al (2017) considered polarization from soil to root tissues, as well as the polarization processes along and around roots, to explain the phase shift observed for different soil water content. Weigand et al (2017) demonstrate that multi-frequency electrical impedance tomography is capable of imaging root system extent as well as monitoring changes associated with root physiological processes.…”

Section: The Mise-à-la-masse Methods Applied To Plant Root Systemsmentioning

confidence: 99%

“…Nevertheless, in some cases, the ranges of electrical resistivity of soil and roots overlap. The amplitude of contrasts varies according to the soil resistivity and tree species (Zanetti et al, 2011;Mary et al, 2016), to the water content and the decay state of the wood itself (Martin, 2012), and to variations in soil water content (Garré et al, 2011;Beff et al, 2013;Mary et al, 2016). The problem would complicate further the correlation with root mass considering heterogeneous soil properties and moisture, as well as the electrical anisotropy caused by the root system, i.e., the root connectivity and root structure as further described in Rao et al (2018).…”

Section: Noninvasive Measurements and Electricalmentioning

confidence: 99%

Small-scale characterization of vine plant root water uptake via 3-D electrical resistivity tomography and mise-à-la-masse method

Mary

Peruzzo

Boaga

et al. 2018

Hydrol. Earth Syst. Sci.

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Abstract. The investigation of plant roots is inherently difficult and often neglected. Being out of sight, roots are often out of mind. Nevertheless, roots play a key role in the exchange of mass and energy between soil and the atmosphere, in addition to the many practical applications in agriculture. In this paper, we propose a method for roots imaging based on the joint use of two electrical noninvasive methods: electrical resistivity tomography (ERT) and mise-à-la-masse (MALM). The approach is based on the key assumption that the plant root system acts as an electrically conductive body, so that injecting electrical current into the plant stem will ultimately result in the injection of current into the subsoil through the root system, and particularly through the root terminations via hair roots. Evidence from field data, showing that voltage distribution is very different whether current is injected into the tree stem or in the ground, strongly supports this hypothesis. The proposed procedure involves a stepwise inversion of both ERT and MALM data that ultimately leads to the identification of electrical resistivity (ER) distribution and of the current injection root distribution in the three-dimensional soil space. This, in turn, is a proxy to the active (hair) root density in the ground. We tested the proposed procedure on synthetic data and, more importantly, on field data collected in a vineyard, where the estimated depth of the root zone proved to be in agreement with literature on similar crops. The proposed noninvasive approach is a step forward towards a better quantification of root structure and functioning.

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“…Dalton, 1995 and similar models). Recently, Mary et al (2017) considered polarization from soil to root tissues, as well as the polarization processes along and around roots, to explain the phase shift (between injected current and voltage response) observed for different soil water content. Kemna (2017, 2019) demonstrated that multi-frequency electrical impedance tomography is capable of imaging root system extent.…”

Section: Introductionmentioning

confidence: 99%

Time-lapse monitoring of root water uptake using electrical resistivity tomography and mise-à-la-masse: a vineyard infiltration experiment

Mary¹,

Peruzzo²,

Boaga³

et al. 2020

SOIL

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Abstract. This paper presents a time-lapse application of electrical methods (electrical resistivity tomography, ERT; and mise-à-la-masse, MALM) for monitoring plant roots and their activity (root water uptake) during a controlled infiltration experiment. The use of non-invasive geophysical monitoring is of increasing interest as these techniques provide time-lapse imaging of processes that otherwise can only be measured at few specific spatial locations. The experiment here described was conducted in a vineyard in Bordeaux (France) and was focused on the behaviour of two neighbouring grapevines. The joint application of ERT and MALM has several advantages. While ERT in time-lapse mode is sensitive to changes in soil electrical resistivity and thus to the factors controlling it (mainly soil water content, in this context), MALM uses DC current injected into a tree stem to image where the plant root system is in effective electrical contact with the soil at locations that are likely to be the same where root water uptake (RWU) takes place. Thus, ERT and MALM provide complementary information about the root structure and activity. The experiment shows that the region of likely electrical current sources produced by MALM does not change significantly during the infiltration time in spite of the strong changes of electrical resistivity caused by changes in soil water content. Ultimately, the interpretation of the current source distribution strengthened the hypothesis of using current as a proxy for root detection. This fact, together with the evidence that current injection in the soil and in the stem produces totally different voltage patterns, corroborates the idea that this application of MALM highlights the active root density in the soil. When considering the electrical resistivity changes (as measured by ERT) inside the stationary volume of active roots delineated by MALM, the overall tendency is towards a resistivity increase during irrigation time, which can be linked to a decrease in soil water content caused by root water uptake. On the contrary, when considering the soil volume outside the MALM-derived root water uptake region, the electrical resistivity tends to decrease as an effect of soil water content increase caused by the infiltration. The use of a simplified infiltration model confirms at least qualitatively this behaviour. The monitoring results are particularly promising, and the method can be applied to a variety of scales including the laboratory scale where direct evidence of root structure and root water uptake can help corroborate the approach. Once fully validated, the joint use of MALM and ERT can be used as a valuable tool to study the activity of roots under a wide variety of field conditions.

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Mapping tree root system in dikes using induced polarization: Focus on the influence of soil water content

Cited by 21 publications

References 36 publications

Improvement of coarse root detection using time and frequency induced polarization: from laboratory to field experiments

Improvement of coarse root detection using time and frequency induced polarization: from laboratory to field experiments

Small-scale characterization of vine plant root water uptake via 3-D electrical resistivity tomography and mise-à-la-masse method

Time-lapse monitoring of root water uptake using electrical resistivity tomography and mise-à-la-masse: a vineyard infiltration experiment

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