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The effect of root exudates on rhizosphere water dynamics

The effect of root exudates on rhizosphere water dynamics
The effect of root exudates on rhizosphere water dynamics
Most water and nutrients essential for plant growth travel across a thin zone of soil at the interface between roots and soil, termed the rhizosphere. Chemicals exuded by plant roots can alter the fluid properties, such as viscosity, of the water phase, potentially with impacts on plant productivity and stress tolerance. In this paper, we study the effects of plant exudates on the macroscale properties of water movement in soil. Our starting point is a microscale description of two fluid flow and exudate diffusion in a periodic geometry composed from a regular repetition of a unit cell. Using multiscale homogenisation theory, we derive a coupled set of equations that describe the movement of air and water, and the diffusion of plant exudates on the macroscale. These equations are parameterised by a set of cell problems that capture the flow behaviour. The mathematical steps are validated by comparing the resulting homogenised equations to the original pore scale equations, and we show that the difference between the two models is ≤7% for 8 cells. The resulting equations provide a computationally efficient method to study plant-soil interactions. This will increase our ability to predict how contrasting root exudation patterns may influence crop uptake of water and nutrients.
0143-702X
Cooper, Laura
b8f4b942-cb87-4386-ab29-17bdd0f53ec1
Daly, K.
f40a9985-ef81-4d7e-a7ea-defa8cf8a533
Hallett, P.D.
b027edfe-728c-4d09-bbbd-4061e6373ef6
Koebernick, Nicolai
118c4e45-02d8-42da-84c8-8ee4fac140ad
George, T.S.
a506ae83-5218-40c6-b582-7243465df9fa
Roose, Tiina
3581ab5b-71e1-4897-8d88-59f13f3bccfe
Cooper, Laura
b8f4b942-cb87-4386-ab29-17bdd0f53ec1
Daly, K.
f40a9985-ef81-4d7e-a7ea-defa8cf8a533
Hallett, P.D.
b027edfe-728c-4d09-bbbd-4061e6373ef6
Koebernick, Nicolai
118c4e45-02d8-42da-84c8-8ee4fac140ad
George, T.S.
a506ae83-5218-40c6-b582-7243465df9fa
Roose, Tiina
3581ab5b-71e1-4897-8d88-59f13f3bccfe

Cooper, Laura, Daly, K., Hallett, P.D., Koebernick, Nicolai, George, T.S. and Roose, Tiina (2018) The effect of root exudates on rhizosphere water dynamics. IEE Proceedings A. (doi:10.1098/rspa.2018.0149).

Record type: Article

Abstract

Most water and nutrients essential for plant growth travel across a thin zone of soil at the interface between roots and soil, termed the rhizosphere. Chemicals exuded by plant roots can alter the fluid properties, such as viscosity, of the water phase, potentially with impacts on plant productivity and stress tolerance. In this paper, we study the effects of plant exudates on the macroscale properties of water movement in soil. Our starting point is a microscale description of two fluid flow and exudate diffusion in a periodic geometry composed from a regular repetition of a unit cell. Using multiscale homogenisation theory, we derive a coupled set of equations that describe the movement of air and water, and the diffusion of plant exudates on the macroscale. These equations are parameterised by a set of cell problems that capture the flow behaviour. The mathematical steps are validated by comparing the resulting homogenised equations to the original pore scale equations, and we show that the difference between the two models is ≤7% for 8 cells. The resulting equations provide a computationally efficient method to study plant-soil interactions. This will increase our ability to predict how contrasting root exudation patterns may influence crop uptake of water and nutrients.

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Accepted/In Press date: 3 August 2018
e-pub ahead of print date: 5 September 2018

Identifiers

Local EPrints ID: 423010
URI: http://eprints.soton.ac.uk/id/eprint/423010
ISSN: 0143-702X
PURE UUID: bf51d407-9d85-46c5-9515-6e97b7b0b23b
ORCID for Laura Cooper: ORCID iD orcid.org/0000-0003-0198-7591
ORCID for Tiina Roose: ORCID iD orcid.org/0000-0001-8710-1063

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Date deposited: 09 Aug 2018 16:30
Last modified: 17 Dec 2019 01:43

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Contributors

Author: Laura Cooper ORCID iD
Author: K. Daly
Author: P.D. Hallett
Author: Nicolai Koebernick
Author: T.S. George
Author: Tiina Roose ORCID iD

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