Impacts of soil moisture variability on the sap flow activity of Norway spruce
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| Titles: | Main Title: Impacts of soil moisture variability on the sap flow activity of Norway spruce Subtitle: 5th PhD report, Inken Rabbel, 2017 |
| Description: | Abstract: Tree water use is a key variable in forest eco-hydrological studies and often monitored by sap flow measurements. One current challenge in the scaling of sap flow from the tree to the forest stand is related to the spatio-temporal heterogeneity of soil water supply. Little is known about the water-stress-response of forest trees. This study aims at a better understanding and quantification of the water stress response of Norway spruce (Picea abies). We combine root-zone water potential simulations in HYDRUS 1-D with a plant water stress factor derived from sap flow measurements at three plots of differing soil moisture regimes. By calibrating HYDRUS 1-D against our sap flow data, we quantify species-specific water stress thresholds. We show that mature Norway spruce is able to maintain its optimum level of transpiration up to soil water potentials of -1000 to -3000 cm pressure head. Transpiration is reduced by aeration stress at water potentials of less than -100 cm pressure head. These findings provide a new basis for future simulation studies and will help to improve the upscaling of transpiration fluxes from the tree to the forest stand and catchment. |
Responsible Party
| Creator: | Inken Rabbel (Author) |
| Publisher: | CRC/TR32 Database (TR32DB) |
| Publication Year: | 2017 |
Topic
| TR32 Topic: | Vegetation |
| Related Subproject: | C1 |
| Subjects: | Keywords: Sap Flow, Soil Moisture, Hydrological Modelling |
| Geogr. Information Topic: | Environment |
File Details
| Filename: | Manuscript_Rabbel.pdf |
| Data Type: | Text - Text |
| File Size: | 826 KB |
| Date: | Created: 07.09.2017 |
| Mime Type: | application/pdf |
| Data Format: | |
| Language: | English |
| Status: | Completed |
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| 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 |
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Specific Information - Report
| Report Date: | 7th of September, 2017 |
| Report Type: | PhD Report |
| Report City: | Bonn |
| Report Institution: | Department of Geography, University of Bonn |
Metadata Details
| Metadata Creator: | Inken Rabbel |
| Metadata Created: | 07.09.2017 |
| Metadata Last Updated: | 07.09.2017 |
| Subproject: | C1 |
| Funding Phase: | 3 |
| Metadata Language: | English |
| Metadata Version: | V50 |
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| Metadata Downloads: | 0 |
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