[880] - A simple three-dimensional macroscopic root water uptake model based on the hydraulic architecture approach

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Couvreur, V., Vanderborght, J., Javaux, M., 2012. A simple three-dimensional macroscopic root water uptake model based on the hydraulic architecture approach. Hydrology and Earth System Sciences, 16 (8), 2957 - 2971. DOI: 10.5194/hess-16-2957-2012.
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Title(s):Main Title: A simple three-dimensional macroscopic root water uptake model based on the hydraulic architecture approach
Description(s):Abstract: Many hydrological models including root water uptake (RWU) do not consider the dimension of root system hydraulic architecture (HA) because explicitly solving water flow in such a complex system is too time consuming. However, they might lack process understanding when basing RWU and plant water stress predictions on functions of variables such as the root length density distribution. On the basis of analytical solutions of water flow in a simple HA, we developed an “implicit” model of the root system HA for simulation of RWU distribution (sink term of Richards’ equation) and plant water stress in three-dimensional soil water flow models. The new model has three macroscopic parameters defined at the soil element scale, or at the plant scale, rather than for each segment of the root system architecture: the standard sink fraction distribution SSF , the root system equivalent conductance Krs and the compensatory RWU conductance Kcomp . It clearly decouples the process of water stress from compensatory RWU, and its structure is appropriate for hydraulic lift simulation. As compared to a model explicitly solving water flow in a realistic maize root system HA, the implicit model showed to be accurate for predicting RWU distribution and plant collar water potential, with one single set of parameters, in dissimilar water dynamics scenarios. For these scenarios, the computing time of the implicit model was a factor 28 to 214 shorter than that of the explicit one. We also provide a new expression for the effective soil water potential sensed by plants in soils with a heterogeneous water potential distribution, which emerged from the implicit model equations. With the proposed implicit model of the root system HA, new concepts are brought which open avenues towards simple and mechanistic RWU models and water stress functions operational for field scale water dynamics simulation.
Identifier(s):DOI: 10.5194/hess-16-2957-2012
Citation Advice:Couvreur, V., J. Vanderborght, and M. Javaux (2012), A simple three-dimensional macroscopic root water uptake model based on the hydraulic architecture approach, Hydrol. Earth Syst. Sci., 16(8), 2957-2971.
Responsible Party
Creator(s):Author: Valentin Couvreur
Author: Jan Vanderborght
Author: Mathieu Javaux
Publisher:European Geosciences Union
TR32 Topic:Vegetation
Subject(s):CRC/TR32 Keywords: RWU, Modelling
Topic Category:Environment
File Details
File Name:couvreur_hess-16-2957-2012.pdf
Data Type:Text
File Size:832 kB (0.812 MB)
Date(s):Date Accepted: 2012-04-18
Mime Type:application/pdf
Data Format:PDF
Download Permission:Free
General Access and Use Conditions:According to the TR32DB data policy agreement.
Access Limitations:According to the TR32DB data policy agreement.
Licence:TR32DB Data policy agreement
North:-no map data
Measurement Region:None
Measurement Location:--None--
Specific Informations - Publication
Article Type:Journal
Source:Hydrology and Earth System Sciences
Number Of Pages:14
Page Range:2957 - 2971
Metadata Details
Metadata Creator:Katrin Huber
Metadata Created:2014-06-23
Metadata Last Updated:2014-06-23
Funding Phase:2
Metadata Language:English
Metadata Version:V40
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