Use of small scale electrical resistivity tomography to identify soil-root interactions during deficit irrigation

Vanella, Daniela and Cassiani, Giorgio and Busato, L. and Boaga, J. and Barbagallo, S. and Binley, A. and Consoli, S. (2018) Use of small scale electrical resistivity tomography to identify soil-root interactions during deficit irrigation. Journal of Hydrology, 556. pp. 310-324. ISSN 0022-1694

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Plant roots activity affect the exchanges of mass and energy between the soil and atmosphere. However, it is challenging to monitor the activity of the root-zone because roots are not visible from the soil surface, and root systems undergo spatial and temporal variations in response to internal and external conditions. Therefore, measurements of the activity of root systems are interesting to ecohydrologists in general, and are especially important for specific applications, such as irrigation water management. This study demonstrates the use of small scale three-dimensional (3-D) electrical resistivity tomography (ERT) to monitor the root-zone of orange trees irrigated by two different regimes: (i) full rate, in which 100% of the crop evapotranspiration (ETc) is provided; and (ii) partial root-zone drying (PRD), in which 50% of ETc is supplied to alternate sides of the tree. We performed time-lapse 3-D ERT measurements on these trees from 5 June to 24 September 2015, and compared the long-term and short-term changes before, during, and after irrigation events. Given the small changes in soil temperature and pore water electrical conductivity, we interpreted changes of soil electrical resistivity from 3-D ERT data as proxies for changes in soil water content. The ERT results are consistent with measurements of transpiration flux and soil temperature. The changes in electrical resistivity obtained from ERT measurements in this case study indicate that root water uptake (RWU) processes occur at the 0.1 m scale, and highlight the impact of different irrigation schemes. (C) 2017 Elsevier B.V. All rights reserved.

Item Type:
Journal Article
Journal or Publication Title:
Journal of Hydrology
Additional Information:
This is the author’s version of a work that was accepted for publication in Journal of Hydrology. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Hydrology, 556, 2018 DOI: 10.1016/j.hydrol.2017.11.025
Uncontrolled Keywords:
?? deficit irrigationgeophysical methodssoil-root interactionssoil moisturesap-flow measurementwater-contentsustainable managementplant interactionsdrying irrigationeddy covarianceapple orchardheat pulsezonedynamicswater science and technology ??
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29 Mar 2018 14:24
Last Modified:
05 May 2024 00:17