The micro-structures of clay given by resistivity measurements

Fukue, Masaharu; Minato, Taro; Horibe, H.; Taya, N.

doi:10.1016/s0013-7952(99)00060-5

Cited by 225 publications

(89 citation statements)

References 2 publications

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“…The relationships between these factors for coarse-grained soils were described by Archie (1942). Electrical properties of cohesive soils are more complex due to the amount and type of clay minerals and are related to ionic, molar and electric conductivity, as well as presence of the electric double layer in clay particles (Waxman and Smith 1968), the degree of saturation, structure, and soil consolidation (Fukue et al 1999). By analogy, peat electrical resistivity depends on water conductivity in the peat pores, moisture content and electric conductivity of the peat matrix that depends on the organic and mineral content, mineral composition, degree of peat decomposition, structure and porosity.…”

Section: Electrical Resistivity Imagingmentioning

confidence: 99%

Application of electrical resistivity imaging (ERI) for the assessment of peat properties: a case study of the Całowanie Fen, Central Poland

et al. 2017

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Complex studies were carried out to recognize the fen structure and peat properties in the Całowanie Fen area, belonging to the Natura 2000 network. The studies were conducted in two study areas that differ significantly in terms of peat thickness. Electrical resistivity imaging (ERI) was used to identify the properties of the peat and its substrate, such as thickness and electrical resistivity. Comparison of the field studies with the laboratory tests has shown that the ash content rises electrical resistivity in peat. In addition, the study has shown that the application of non-invasive geophysical methods in protected areas is justified. The fen, as a medium containing mostly water, was a proper test area for the ERI measurements.

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Section: Electrical Resistivity Imagingmentioning

confidence: 99%

Application of electrical resistivity imaging (ERI) for the assessment of peat properties: a case study of the Całowanie Fen, Central Poland

et al. 2017

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“…However, experimental results on saturated clays have shown that resistivity is extremely high (in the order of hundreds Ohm m) only for a very low water content (<10 %). ER values abruptly drop to values of around 10 Ohm m atthewater content higher than around 20%, because of continuity of pore water (Fukue et al, 1999). Resistivity measured on clay samples collected worldwide varies in a very narrow range (from 1 to 12 Ohm m), and this conductive behaviour makes clayey horizons clearly discernible from overlaying silty and sandy soil layers (Giao et al, 2003).…”

Section: Resultsmentioning

confidence: 99%

Electrical resistivity tomography to delineate greenhouse soil variability

Rossi¹,

Amato²,

Bitella³

et al. 2013

International Agrophysics

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Appropriate management of soil spatial variability is an important tool for optimizing farming inputs, with the result of yield increase and reduction of the environmental impact in field crops. Under greenhouses, several factors such as non-uniform irrigation and localized soil compaction can severely affect yield and quality. Additionally, if soil spatial variability is not taken into account, yield deficiencies are often compensated by extra-volumes of crop inputs; as a result, over-irrigation and overfertilization in some parts of the field may occur. Technology for spatially sound management of greenhouse crops is therefore needed to increase yield and quality and to address sustainability. In this experiment, 2D-electrical resistivity tomography was used as an exploratory tool to characterize greenhouse soil variability and its relations to wild rocket yield. Soil resistivity well matched biomass variation (R2=0.70), and was linked to differences in soil bulk density (R2=0.90), and clay content (R2=0.77). Electrical resistivity tomography shows a great potential in horticulture where there is a growing demand of sustainability coupled with the necessity of stabilizing yield and product quality.

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“…It is well known that the tendency of resistivity change due to clay content decreases the resistivity with increasing clay content although there is difference response depending on clay types. The electrical charges on the clay surface resulted in greater electrical conductivity due to the magnitude of the specific surface (Fukue et al, 1999;Samouelian et al, 2005) and it is particularly true when clay particles are coated on the surface of sand grain in soil, leading to greater continuity for electric current flow by clay bridge (Lamout et al, 1994;Samouelian et al, 2005). Root uptake in clay loam would be slower than that in sandy loam causing higher water content and lower electrical resistivity (Fig.…”

Section: Resultsmentioning

confidence: 99%

Use of Two Dimensional Electrical Resistivity Tomography to Identify Soil Water Dynamics and the Effective Plant Root Zone

Yoon¹,

Zhang²,

Han³

et al. 2012

Korean Journal of Soil Science and Fertilizer

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The identification of effective root zone would clarify dynamics of plant available water and soil water balance. Using the relationship between soil properties and electrical resistivity (ER) the purpose of this research is to identify soil zone affected by a plant root activity using electrical resistivity tomography (ERT) technique. Four plastic containers were prepared for two different soil textures (clay and sandy loam) and one container for each texture was selected for planting four corn seedlings (Zea mays L.) and the others were prepared for the blank. For ERT monitoring, we prepared 0.8 m plastic sticks with 17 electrodes installed with 5 cm space. The Ministing (AGI Inc., Texas) instrument for electrical resistivity measurement and semi-auto converter of electrode arrangement were set up for dipole-dipole array. During 2 months of the corns growing, ERT monitoring was made 3 to 4 days after the irrigation practice. Despite of the same amount water supplied into soils, two textures showed very different apparent resistivity values due to different clay content. The apparent electrical resistivity is consistently lower in clay loam comparing to sandy loam soil implying that plant root does not significantly alter the overall trend of resistivity. When plant root system, however, is active both soils with plants showed 2-7 times higher electrical resistivity and higher coefficient variation than soils without plant, implying the effect of root system on the resistivity, in which may caused by . This result suggests plant root activities regulating the soil water dynamics mainly control the variation of electrical resistivity over soil textural difference. Therefore the identification of water uptake zone would highly be correlated to plant root activities, thus ERT will be feasible approach to identify spatial characteristics of a plant root activity.

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The micro-structures of clay given by resistivity measurements

Cited by 225 publications

References 2 publications

Application of electrical resistivity imaging (ERI) for the assessment of peat properties: a case study of the Całowanie Fen, Central Poland

Application of electrical resistivity imaging (ERI) for the assessment of peat properties: a case study of the Całowanie Fen, Central Poland

Electrical resistivity tomography to delineate greenhouse soil variability

Use of Two Dimensional Electrical Resistivity Tomography to Identify Soil Water Dynamics and the Effective Plant Root Zone

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