Assessing the influence of the rhizosphere on soil hydraulic properties using X-ray computed tomography and numerical modelling

Journal of Experimental Botany
K R DalySaoirse R Tracy

Abstract

Understanding the dynamics of water distribution in soil is crucial for enhancing our knowledge of managing soil and water resources. The application of X-ray computed tomography (CT) to the plant and soil sciences is now well established. However, few studies have utilized the technique for visualizing water in soil pore spaces. Here this method is utilized to visualize the water in soil in situ and in three-dimensions at successive reductive matric potentials in bulk and rhizosphere soil. The measurements are combined with numerical modelling to determine the unsaturated hydraulic conductivity, providing a complete picture of the hydraulic properties of the soil. The technique was performed on soil cores that were sampled adjacent to established roots (rhizosphere soil) and from soil that had not been influenced by roots (bulk soil). A water release curve was obtained for the different soil types using measurements of their pore geometries derived from CT imaging and verified using conventional methods, such as pressure plates. The water, soil, and air phases from the images were segmented and quantified using image analysis. The water release characteristics obtained for the contrasting soils showed clear differences in hydr...Continue Reading

References

May 15, 2003·Plant Physiology·Travis S WalkerJorge M Vivanco
May 11, 2010·Journal of Contaminant Hydrology·Jeffrey Lewis, Jan Sjöstrom
Feb 11, 2014·Proceedings. Mathematical, Physical, and Engineering Sciences·K R Daly, T Roose

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Citations

Jan 8, 2016·Journal of Experimental Botany·Keith R DalyTiina Roose
Jan 19, 2016·Trends in Plant Science·Eva Oburger, Hannes Schmidt
Mar 17, 2016·Journal of Experimental Botany·Larry M YorkMalcolm J Bennett
Jun 1, 2016·Environmental Science & Technology·Mohamed HamidatCatherine Santaella
Jun 28, 2016·Annals of Botany·A CarminatiM Holz
Dec 12, 2017·Proceedings. Mathematical, Physical, and Engineering Sciences·L J CooperT Roose
Mar 13, 2018·Journal of Experimental Botany·Daniela Dietrich
Dec 24, 2018·Scientific Reports·Sheikh M F RabbiIain M Young
Jul 25, 2019·Plants·Hillel Fromm
Feb 13, 2019·Journal of Plant Research·Johannes Daniel Scharwies, José R Dinneny

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Methods Mentioned

BETA
X-ray

Software Mentioned

OpenFOAM
VG StudioMax
ImageJ
Genstat
datos
rec

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