Simulating root water uptake regulation under drought stress using DuMux-CRootBox
(2019) Rhizosphere 5 — Location: Saskatoon, Saskatchewan, Canada (7.July.2019)
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- Abstract
- Plant transpiration and root water uptake are dependent on multiple traits that interact with site soil characteristics and environmental factors such as radiation, atmospheric temperature, relative humidity, and soil-moisture content. Models of root architecture and functions are increasingly employed to simulate root-soil interactions. Root water uptake is thereby affected by the root hydraulic architecture, the soil moisture conditions, soil hydraulic properties and the transpiration demand as controlled by atmospheric conditions. Stomatal conductance plays a vital role in regulating transpiration in plants. Isohydric plants follow the strategy to close their stomata in order to maintain the leaf water potential at a constant level, while anisohydric plants leave their stomata open when leaf water potentials fall due to drought stress. Modeling the stomatal regulation effectively will result in a more reliable model that will regulate the excessive loss of water. We performed the simulations of plant water uptake and transpiration on a DUNE-based simulator DuMux. It simulates the flow and transport processes in porous media that can represent the porous medium (including soil) with embedded hierarchical biological networks (in this case, root system). We implemented hydraulic and chemical stomatal control of root water uptake in DuMux following the current approach where stomatal control is regulated by simulated water potential and/or chemical signal concentration. We then performed a mesh convergence study in order to verify the accuracy of our results. Finally, we conducted the simulations for different scenarios to study the effect of hydraulic and chemical regulation on root system performance under drought stress. Future work will include incorporating further modeling capabilities into DuMux which will facilitate the consideration of further soil and rhizosphere processes in the simulations, such as nutrients, root exudes or soil microorganisms.
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Citations
Khare, D., Verhoef, A., Javaux, M., Vanderborght, J., Leitner, D., Koch, T., & Schnepf, A. (2019). Simulating root water uptake regulation under drought stress using DuMux-CRootBox. Book of Abstracts, p. 190. https://hdl.handle.net/2078.5/222779