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TRCC - Tree Response to Climate Change - Davos
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Fig.1. Lake of Davos with the mountain Seehorn in the back. The research station Seehornwald is located in a Norway spruce forest in the saddle between lake and mountain at 1650 m asl.
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Microclimate and tree physiological measurements under field conditions have been recorded at the research station Seehornwald for two decades. Continuous data series of gas exchange from the levels of branches, individual trees up to a forest patch (Eddy-Covariance) have been recorded in 10 min-intervals over the last 10 years. In parallel, concurrent stem radius changes and sap flow rates have been measured for the same time period. The combined data sets allow detailed insights into the tree water relations and carbon assimilation processes for the Norway spruce forest Seehornwald. Currently, we are analyzing the unique data sets in terms of physiological responses to climate change during the recent decades. The measurement campaign has been set-up by Rudolf Häsler in the 1980s.
WSL Contact
Roman Zweifel
Cooperations
Prof. Dr. Nina Buchmann and Dr. Werner
Eugster, Institute of Plant Sciences, ETH Zurich.
Linked Projects
Seehornwald Davos Research site
TRCC - Valais
LWF
TreeNet
Downloads
- Tschopp T. (2012). Zur Geschichte des Seehornwaldes in Davos. Praktikumsarbeit unter der Leitung von Bürgi M., und Gimmi U. WSL, 40 Seiten (PDF 22 MB).
- Etzold S., Ruehr N.K., Zweifel R., Dobbertin M., Zingg A., Pluess P.,
Häsler R., Eugster W., Buchmann N. 2011. The carbon balance of two
contrasting mountain forest ecosystems in Switzerland: Similar annual
trends, but seasonal differences. Ecosystems, DOI:
10.1007/s10021-011-9481-3: 1-21. (PDF 690KB)
- Zweifel R., Eugster W., Etzold S., Dobbertin M., Buchmann N., and
Häsler R. 2010. Link between continuous stem radius changes and net
ecosystem productivity of a subalpine Norway spruce forest in the Swiss
Alps. New Phytologist. 187: 819-830 (PDF 510KB).
- Zweifel, R., L. Zimmermann and D.M. Newbery. 2005. Modeling tree water deficit from microclimate: an approach to quantifying drought stress. Tree Physiology 25:147-156. (PDF 791KB )
- Zweifel R, Böhm JP and Häsler R. 2002. Midday stomatal closure in Norway spruce – Reactions in the upper
and lower crown. Tree Physiology. 22, 1125-1136. (PDF 2075KB)
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Zweifel R and Häsler R. 2001. Dynamics of water storage in mature, subalpine Picea abies: temporal and
spatial patterns of change in stem radius. Tree Physiology. 21, 561-569. (PDF 1006KB)
- Zweifel R, Item H and Häsler R. 2001. Link between diurnal stem radius changes and tree water relations. Tree
Physiology. 21, 869-877.
(PDF 929KB)
- Zweifel R and Häsler R. 2000. Frost-induced reversible shrinkage of bark of mature, subalpine conifers.
Agricultural and Forest Meteorology. 102, 213-222. (PDF 1518KB)
- Zweifel R, Item H and Häsler R. 2000. Stem radius changes and their relation to stored water in stems of young
Norway spruce trees. Trees. 15, 50-57. (PDF 2512KB)
- Zweifel R. 1999. The rhythm of trees - water storage dynamics in subalpine Norway spruce. Dissertation. ETH
Zürich No. 13391. 112 p. (Link ETHZ)
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Herzog, K.M., R. Thum, G. Kronfuß, H.-J. Heldstab, and R. Häsler. 1998. Pattern and mechanism of
transpiration within a large subalpine Norway spruce (Picea abies (L.) Karst.). Ecological Research 13: 105-116. (PDF 980 KB)
- Herzog, K.M., R. Thum, R. Zweifel, and R. Häsler. 1997. Heat balance measurements – to quantify sap flow in
thin stems only? Agricultural and Forest Meteorology, 83: 75-94. (PDF 1200 KB)
- Herzog, K.M., R.Häsler, and R. Thum. 1995. Diurnal changes in the radius of a subalpine Norway spruce stem:
their relation to the sap flow and their use to estimate transpiration. Trees 10: 94-101
| Keywords: |
Picea abies, Baumwasserhaushalt, Eddy-Covariance, Stammradiusfluktuationen, physiologische Regelkreise, stomatäre Regulation. |
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