Parameterization of root water uptake models considering dynamic root distributions and water uptake compensation

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Title:Main Title: Parameterization of root water uptake models considering dynamic root distributions and water uptake compensation
Description:Abstract: The spatio-temporal distribution of root water uptake (RWU) depends on the dynamics of the root distribution and compensatory uptake from wetter regions in the root zone. This work aims at parameterizing three RWU models with different representations of compensation: the Feddes-Jarvis model (Šimůnek and Hopmans, 2009) that uses an empirical function, the Feddes model (Feddes, et al., 1978) without compensation, and the Couvreur model (Couvreur, et al., 2012) that is based on a physical description of water flow in the soil-root system. These models were implemented in Hydrus-1D and soil hydraulic parameters were optimized by inverse modeling using soil water content and potential measurements and observations of root distributions of winter wheat (Triticum aestivum) in horizontally installed rhizotubes. Soil moisture was equally well predicted by the three models and the soil hydraulic parameters optimized by the models with compensation were comparable. The obtained RWU parameters of the Feddes-Jarvis model were consistent with data reported in the literature though the parameters h3l and h3h could not be uniquely identified. Response surfaces of the objective function showed that the root-related parameters of the Couvreur model could be identified using inverse modeling. Furthermore, these parameters were consistent with combined root architectural and hydraulic observations from the literature. The Feddes-Jarvis and the Couvreur models simulated similar root-system scale stress functions that link total RWU to the effective root zone water potential, suggesting that parameters may be transferable between both models. Simulated RWU profiles differed due to different water redistribution by the root system, but the measurements were not sufficiently precise to observe this redistribution.
Identifier:10.2136/vzj2016.12.0125 (DOI)
Responsible Party
Creators:Gaochao Cai (Author), Jan Vanderborght (Author), Valentin Couvreur (Author), Cho Miltin Mboh (Author), Harry Vereecken (Author)
Publisher:Soil Science Society of America
Publication Year:2017
Topic
TR32 Topic:Soil
Related Subproject:B4
Subjects:Keywords: soil Hydraulic Properties, Inverse Modelling, Soil Water Content, Root Length Density, Hydraulic Parameters, Transpiration
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Filename:ParameterizationofRootWaterUptakeModelsConsideringDynamicRootDistributions.pdf
Data Type:Text - Article
File Size:4.8 MB
Date:Accepted: 10.05.2017
Mime Type:application/pdf
Language:English
Status:Completed
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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
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Publication Status:Accepted
Review Status:Peer reviewed
Publication Type:Article
Article Type:Journal
Source:Vadose Zone Journal
Number of Pages: ( - )
Metadata Details
Metadata Creator:Gaochao Cai
Metadata Created:14.05.2017
Metadata Last Updated:14.05.2017
Subproject:B4
Funding Phase:2
Metadata Language:English
Metadata Version:V50
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