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| Titel |
Evaluation of water fluxes in the spruce tree SPA system using sap flow measurement |
| VerfasserIn |
M. Dohnal, T. Vogel, M. Tesar, J. Dusek, M. Cislerova |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250026097
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| Zusammenfassung |
| An adequate and physically sound description of the local scale soil-plant-atmosphere (SPA)
processes and their spatiotemporal variability is essential for our ability to predict the impact
of possible future changes of governing system parameters. In this contribution we focus on
the role of the various components of the SPA system and their impact on the temporal
variations of sap flow through a spruce tree. Experimental station, located in a forested
mountainous area, is instrumented with devices for monitoring basic meteorological and
hydrological variables. Automated tensiometers and soil moisture sensors have provided full
picture about water flow dynamics in the soil profile. Sap flow measurement by heat field
deformation method has been carried out on several full-grown spruce tree specimens (stems
and roots) for last two years. The sap flow dynamics of a single spruce tree was
compared with the tensiometric data and the transpiration intensities resulting from the
analysis of the observed meteorological data. In addition, detailed numerical modeling
of transient soil water movement in the spruce root zone was performed using a
two-dimensional model based on the Richards’ equation. The model results were compared
with the tensiometric and soil water content data. Relatively good agreement was
achieved.
The work was supported by the Grant Agency of the Czech Republic project
No. 205/08/1174. |
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