[565] - Modeling of root water uptake responses for heterogeneously distributed soil water

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Huber, K., 2012. Modeling of root water uptake responses for heterogeneously distributed soil water. PhD Report, Institute of Bio and Geosciences Agrosphere (IBG-3), Research Center Jülich, Jülich, Germany. Accessed from https://www.tr32db.uni-koeln.de/data.php?dataID=565 at 2019-07-20.
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Title(s):Main Title: Modeling of root water uptake responses for heterogeneously distributed soil water
Description(s):Abstract: A simulation study was conducted using a three-dimensional soil and root model. The soil domain was split in two hydraulically independent compartments that were partially irrigated. An additional signal, generated at the root tips as a function of root xylem pressure was implemented with a particle tracking algorithm to investigate the effect of hormonal signaling in case of partial drought stress. Different plant responses were modeled and compared. Actual transpiration of the simulation with anisohydric behavior always met potential transpiration and had thus the highest water exploitation with the lowest plant pressures. The simulation with isohydric behavior started to reduce transpiration after the plant pressure head reached a predefined threshold. In a third simulation transpiration reduction was modeled as a function of hormonal signaling and showed a continuous adjustment of actual transpiration. The forth simulation described a response to hormonal signaling and plant pressure head. This simulation showed the strongest response with the lowest actual transpiration. The influence of water flow velocities on signaling was examined comparing the particle tracking algorithm with an instantaneous signal. In cases of prolonged drought stress water flow velocities are close to zero and particles are trapped in the root system.
Responsible Party
Creator(s):Author: Katrin Huber
Publisher:CRC/TR32 Database (TR32DB)
TR32 Topic:Vegetation
Subject(s):CRC/TR32 Keywords: PhD Report
File Details
File Name:Report3_Huber_2012.pdf
Data Type:Text
File Size:1974 kB (1.928 MB)
Date(s):Available: 2012-10-30
Mime Type:application/pdf
Data Format:PDF
Download Permission:OnlyTR32
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 - Report
Report Date:30th of October, 2012
Report Type:PhD Report
Report City:Jülich, Germany
Report Institution:Institute of Bio and Geosciences Agrosphere (IBG-3), Research Center Jülich
Number Of Pages:14
Period of Pages:1 - 14
Further Informations:TR32 Student Report Phase II
Metadata Details
Metadata Creator:Katrin Huber
Metadata Created:2013-11-28
Metadata Last Updated:2013-11-28
Funding Phase:2
Metadata Language:English
Metadata Version:V40
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