Using Sap Flow Data to Parameterize the Feddes Water Stress Model for Norway Spruce
| Autor: | Heye Bogena, Burkhard Neuwirth, Bernd Diekkrüger, Inken Rabbel |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
lcsh:Hydraulic engineering
010504 meteorology & atmospheric sciences 0208 environmental biotechnology Geography Planning and Development Norway spruce (Picea abies) 02 engineering and technology Aquatic Science soil water potential 01 natural sciences Biochemistry Water balance ddc:690 lcsh:Water supply for domestic and industrial purposes lcsh:TC1-978 Forest ecology Water content 0105 earth and related environmental sciences Water Science and Technology Transpiration Hydrology lcsh:TD201-500 biology Picea abies biology.organism_classification 020801 environmental engineering Water potential Soil water Environmental science HYDRUS-1D Water use |
| Zdroj: | Water; Volume 10; Issue 3; Pages: 279 Water, Vol 10, Iss 3, p 279 (2018) Water 10(3), 279-(2018). doi:10.3390/w10030279 |
| ISSN: | 2073-4441 |
| DOI: | 10.3390/w10030279 |
| Popis: | Tree water use is a key variable in forest eco-hydrological studies and is often monitored by sap flow measurements. Upscaling these point measurements to the stand or catchment level, however, is still challenging. Due to the spatio-temporal heterogeneity of stand structure and soil water supply, extensive measuring campaigns are needed to determine stand water use from sap flow measurements alone. Therefore, many researchers apply water balance models to estimate stand transpiration. To account for the effects of limited soil water supply on stand transpiration, models commonly refer to plant water stress functions, which have rarely been parameterized for forest trees. The aim of this study was to parameterize the Feddes water stress model for Norway spruce (Picea abies [L.] Karst.). After successful calibration and validation of the soil hydrological model HYDRUS-1D, we combined root-zone water potential simulations with a new plant water stress factor derived from sap flow measurements at two plots of contrasting soil moisture regimes. By calibrating HYDRUS-1D against our sap flow data, we determined the critical limits of soil water supply. Drought stress reduced the transpiration activity of mature Norway spruce at root-zone pressure heads |
| Databáze: | OpenAIRE |
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