[566] - Modeling of hormonally regulated actual transpiration for non-uniformly distributed soil water

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Huber, K., 2013. Modeling of hormonally regulated actual transpiration for non-uniformly 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=566 at 2019-08-20.
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Title(s):Main Title: Modeling of hormonally regulated actual transpiration for non-uniformly distributed soil water
Description(s):Abstract: Stomatal closure is the main driver for transpiration reduction. We investigate in a simulation study different triggers, namely leaf pressure and/or hormone concentrations, of stomatal closure. The main question was how plants react if there is enough water in the soil to maintain potential transpiration but non-uniformly distributed. To mimic split-root experiments the domain was split in two hydraulically independent compartments that were partially irrigated. We used a fully coupled 3D model for water flow in soil, into and through roots [Javaux et al., 2008]. Hormones were initiated at the root tips as a function of local root pressure head and transported via advective flow towards the shoot. Two transpiration scenarios, constant and diurnal, were compared and a sensitivity analysis was carried out. We found a considerable impact of hormonal transport, which ceased in case of very low partial water contents. Further we could show that stomata will start to oscillate in case of low water availabilities.
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:Report4_Huber_2013.pdf
Data Type:Text
File Size:1663 kB (1.624 MB)
Date(s):Available: 2013-04-30
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 April, 2013
Report Type:PhD Report
Report City:Jülich, Germany
Report Institution:Institute of Bio and Geosciences Agrosphere (IBG-3), Research Center Jülich
Number Of Pages:27
Period of Pages:1 - 27
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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