[1646] - Parameterization of root water uptake models considering dynamic root distributions and water uptake compensation

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Cai, G., Vanderborght, J., Couvreur, V., Mboh, C. M., Vereecken, H., 2017. Parameterization of root water uptake models considering dynamic root distributions and water uptake compensation. Vadose Zone Journal, . DOI: 10.2136/vzj2016.12.0125.
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Title(s):Main Title: Parameterization of root water uptake models considering dynamic root distributions and water uptake compensation
Description(s):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(s):DOI: 10.2136/vzj2016.12.0125
Responsible Party
Creator(s):Author: Gaochao Cai
Author: Jan Vanderborght
Author: Valentin Couvreur
Author: Cho Miltin Mboh
Author: Harry Vereecken
Publisher:Soil Science Society of America
TR32 Topic:Soil
Related Sub-project(s):B4
Subject(s):CRC/TR32 Keywords: soil Hydraulic Properties, Inverse Modelling, Soil Water Content, Root Length Density, Hydraulic Parameters, Transpiration
File Details
File Name:ParameterizationofRootWaterUptakeModelsConsideringDynamicRootDistributions.pdf
Data Type:Text
File Size:4904 kB (4.789 MB)
Date(s):Date Accepted: 2017-05-10
Mime Type:application/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:Ellebach
Measurement Location:Selhausen
Specific Informations - Publication
Article Type:Journal
Source:Vadose Zone Journal
Metadata Details
Metadata Creator:Gaochao Cai
Metadata Created:2017-05-14
Metadata Last Updated:2017-05-14
Funding Phase:2
Metadata Language:English
Metadata Version:V41
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