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Quantification of root water uptake in soil using X-ray computed tomography and image-based modelling: Quantification of root water uptake in soil

Daly, Keith R.; Tracy, Saoirse R.; Crout, Neil M.J.; Mairhofer, Stefan; Pridmore, Tony P.; Mooney, Sacha J.; Roose, Tiina

Authors

Keith R. Daly

Saoirse R. Tracy

NEIL CROUT neil.crout@nottingham.ac.uk
Professor of Environmental Modelling

Stefan Mairhofer

TONY PRIDMORE tony.pridmore@nottingham.ac.uk
Professor of Computer Science

SACHA MOONEY sacha.mooney@nottingham.ac.uk
Professor of Soil Physics

Tiina Roose



Abstract

Spatially averaged models of root-soil interactions are often used to calculate plant water uptake. Using a combination of X-ray Computed Tomography (CT) and image based modelling we tested the accuracy of this spatial averaging by directly calculating plant water uptake for young wheat plants in two soil types. The root system was imaged using X-ray CT at 2, 4, 6, 8 and 12 days after transplanting. The roots were segmented using semi-automated root tracking for speed and reproducibility. The segmented geometries were converted to a mesh suitable for the numerical solution of Richards’ equation. Richards’ equation was parameterised using existing pore scale studies of soil hydraulic properties in the rhizosphere of wheat plants. Image based modelling allows the spatial distribution of water around the root to be visualised and the fluxes into the root to be calculated. By comparing the results obtained through image based modelling to spatially averaged models, the impact of root architecture and geometry in water uptake was quantified. We observed that the spatially averaged models performed well in comparison to the image based models with

Citation

Daly, K. R., Tracy, S. R., Crout, N. M., Mairhofer, S., Pridmore, T. P., Mooney, S. J., & Roose, T. (2018). Quantification of root water uptake in soil using X-ray computed tomography and image-based modelling: Quantification of root water uptake in soil. Plant, Cell and Environment, 41(1), 121-133. https://doi.org/10.1111/pce.12983

Journal Article Type Article
Acceptance Date Apr 3, 2017
Online Publication Date Jul 5, 2017
Publication Date 2018-01
Deposit Date Apr 26, 2017
Publicly Available Date Jul 5, 2017
Journal Plant, Cell & Environment
Print ISSN 0140-7791
Electronic ISSN 1365-3040
Publisher Wiley
Peer Reviewed Peer Reviewed
Volume 41
Issue 1
Pages 121-133
DOI https://doi.org/10.1111/pce.12983
Keywords Matric potential; rhizosphere; root water uptake; soil pores; wheat; water release characteristic; X-ray Computed Tomography; image based homogenisation
Public URL http://eprints.nottingham.ac.uk/id/eprint/42292
Publisher URL http://onlinelibrary.wiley.com/doi/10.1111/pce.12983/full
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf
Additional Information This is the peer reviewed version of the following article: Daly, K. R., Tracy, S. R., Crout, N. M. J., Mairhofer, S., Pridmore, T. P., Mooney, S. J., and Roose, T. (2017) Quantification of root water uptake in soil using X-ray computed tomography and image-based modelling. Plant, Cell & Environment, doi: 10.1111/pce.12983 which has been published in final form at http://onlinelibrary.wiley.com/doi/10.1111/pce.12983/full This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.

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