This title appears in the Scientific Report :
2013
Simulating water and solute flow from soil to leaf
Simulating water and solute flow from soil to leaf
Water transport from soil to root, driven by the plant transpiration, is an important component of the hydrological cycle. The model R-SWMS combines 3D water flow and solute transport in soil with a detailed root structure in three dimensions [Javaux et al., 2008]. The possibility to calculate root...
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Personal Name(s): | Huber, Katrin (Corresponding author) |
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Schröder, Natalie / Vanderborght, Jan / Javaux, Mathieu / Vereecken, Harry | |
Contributing Institute: |
Agrosphäre; IBG-3 |
Imprint: |
2013
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Conference: | Soil Systems and Critical Zone Processes: Integrage Life Support Functions Across Disciplines, Monte Verita (Ascona) (Switzerland), 2013-04-14 - 2013-04-18 |
Document Type: |
Poster |
Research Program: |
Modelling and Monitoring Terrestrial Systems: Methods and Technologies |
Publikationsportal JuSER |
Water transport from soil to root, driven by the plant transpiration, is an important component of the hydrological cycle. The model R-SWMS combines 3D water flow and solute transport in soil with a detailed root structure in three dimensions [Javaux et al., 2008]. The possibility to calculate root water and solute uptake and flow within the roots enables an explicit view to distributions of water and solutes around the roots and local processes at the root-soil interface can be defined and studied. We demonstrate the application of the R-SWMS model to study of two important problems in irrigation agriculture: the impact of salinity and partial root zone drying on root water uptake and plant transpiration.
Plant roots do not only affect the solute movement due to a changed water flow distribution, but also because of different solute uptake mechanisms [Schröder et al., 2012]. In addition, high solute concentration in soil can lead to osmotic potentials, which cannot be neglected anymore and affect the root water uptake, since the uptake depends on the local total water potential gradient. By using the R-SWMS model, we show that plant transpiration reduction is only dependent on the total water potential at the root-soil interface and upscaled water potentials, which are often measured in experimental studies, lead to non-unique relations between root water uptake and actual transpiration.
As plant transpiration reduction is dependent on stomatal conductance which can in turn be sensitive to plant hormones, we implemented hormone production in the roots as a function of root water potential. Being transported through the root system and arriving at the plant leaves the hormones become effective in stomatal closure. Different plant behaviors and their influences on the soil water status can be investigated. Furthermore widely used irrigation techniques, i.e. partial root zone drying, can be modeled. |