TR32-Database: Database of Transregio 32

[1691] - Impacts of soil moisture variability on the sap flow activity of Norway spruce

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Rabbel, I., 2017. Impacts of soil moisture variability on the sap flow activity of Norway spruce. PhD Report, Department of Geography, University of Bonn, Bonn. Accessed from at 2018-06-24.
Title(s):Main Title: Impacts of soil moisture variability on the sap flow activity of Norway spruce
Subtitle: 5th PhD report, Inken Rabbel, 2017
Description(s):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(s):Author: Inken Rabbel
Publisher:CRC/TR32 Database (TR32DB)
TR32 Topic:Vegetation
Related Sub-project(s):C1
Subject(s):CRC/TR32 Keywords: Sap Flow, Soil Moisture, Hydrological Modelling
Topic Category:Environment
File Details
File Name:Manuscript_Rabbel.pdf
Data Type:Text
File Size:826 kB (0.807 MB)
Date(s):Created: 2017-09-07
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.
North:-no map data
Measurement Region:Erkensruhr
Measurement Location:Wüstebach
Specific Informations - 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:2017-09-07
Metadata Last Updated:2017-09-07
Funding Phase:3
Metadata Language:English
Metadata Version:V42
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