A simple three-dimensional macroscopic root water uptake model based on the hydraulic architecture approach
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| Title: | Main Title: A simple three-dimensional macroscopic root water uptake model based on the hydraulic architecture approach |
| Description: | 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: | 10.5194/hess-16-2957-2012 (DOI) |
| 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
| Creators: | Valentin Couvreur (Author), Jan Vanderborght (Author), Mathieu Javaux (Author) |
| Publisher: | European Geosciences Union |
| Publication Year: | 2014 |
Topic
| TR32 Topic: | Vegetation |
| Related Subproject: | B4 |
| Subjects: | Keywords: RWU, Modelling |
| Geogr. Information Topic: | Environment |
File Details
| Filename: | couvreur_hess-16-2957-2012.pdf |
| Data Type: | Text - Article |
| File Size: | 832 KB |
| Date: | Accepted: 18.04.2012 |
| Mime Type: | application/pdf |
| Data Format: | |
| Language: | English |
| Status: | Completed |
Constraints
| 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 |
Geographic
Specific Information - Publication
| Publication Status: | Published |
| Review Status: | Peer reviewed |
| Publication Type: | Article |
| Article Type: | Journal |
| Source: | Hydrology and Earth System Sciences |
| Source Website: | http://www.hydrol-earth-syst-sci.net |
| Issue: | 8 |
| Volume: | 16 |
| Number of Pages: | 15 (2957 - 2971) |
Metadata Details
| Metadata Creator: | Katrin Huber |
| Metadata Created: | 23.06.2014 |
| Metadata Last Updated: | 23.06.2014 |
| Subproject: | B4 |
| Funding Phase: | 2 |
| Metadata Language: | English |
| Metadata Version: | V50 |
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| Page Visits: | 746 |
| Metadata Downloads: | 0 |
| Dataset Downloads: | 9 |
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