Modeling of root water uptake responses for heterogeneously distributed soil water
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| Title: | Main Title: Modeling of root water uptake responses for heterogeneously distributed soil water |
| Description: | 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: | Katrin Huber (Author) |
| Publisher: | CRC/TR32 Database (TR32DB) |
| Publication Year: | 2013 |
Topic
| TR32 Topic: | Vegetation |
| Related Subproject: | B4 |
| Subject: | Keyword: PhD Report |
File Details
| Filename: | Report3_Huber_2012.pdf |
| Data Type: | Text - Text |
| File Size: | 1.9 MB |
| Date: | Available: 30.10.2012 |
| Mime Type: | application/pdf |
| Data Format: | |
| Language: | English |
| Status: | Completed |
Constraints
| Download Permission: | Only Project Members |
| 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 - 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 (1 - 14) |
| Further Information: | TR32 Student Report Phase II |
Metadata Details
| Metadata Creator: | Katrin Huber |
| Metadata Created: | 28.11.2013 |
| Metadata Last Updated: | 28.11.2013 |
| Subproject: | B4 |
| Funding Phase: | 2 |
| Metadata Language: | English |
| Metadata Version: | V50 |
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Dataset Statistics
| Page Visits: | 661 |
| Metadata Downloads: | 0 |
| Dataset Downloads: | 0 |
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