Modeling of hormonally regulated actual transpiration for non-uniformly distributed soil water
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| Title: | Main Title: Modeling of hormonally regulated actual transpiration for non-uniformly distributed soil water |
| Description: | 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: | 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: | Report4_Huber_2013.pdf |
| Data Type: | Text - Text |
| File Size: | 1.6 MB |
| Date: | Available: 30.04.2013 |
| 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 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 (1 - 27) |
| 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: | 637 |
| Metadata Downloads: | 0 |
| Dataset Downloads: | 0 |
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