|
1876
|
Beginning of standard meteorological records at Davos (MeteoSwiss). The measurements are located 2 km from the Seehornwald Davos site.
|
1985
|
Selection of the Seehornwald Davos research site for the Swiss project NRP14+ and start of the setup by R. Häsler et al.
|
|
1986-1988
|
Start of measurements at the Seehornwald Davos research site within the frame of NRP14+ with focus on forest decline:
- Set up of the 35 m measurement tower and the 25 m steel frame around two trees.
- Air chemistry monitoring (e.g. O3, NO, NO2, SO2) by W. Graber, later continued by NABEL.
- Fine particular matter deposition (Zn, Pb, Cd) by Gehrig, EMPA
- Microclimate profile through canopy
- Wet and throughfall deposition by Klöti et al., EAFV. Restarted by A. Thimonier and M. Schmitt, WSL in 2009. (EAFV is the former name of the WSL).
- Tree property measurements in a 0.25 ha plot (stem diameter, tree height, etc.). Restarted by M. Dobbertin, WSL in 2007.
- Soil property measurements by Schindler (NABO) and Häsler et al. (EAFV)
- Litterfall by P. Lüscher
- Continuous gas exchange measurement of branches by R. Häsler et al. (EAFV)
- Fog sampling and chemical analyses by H. Turner, EAFV
|
1991
|
Start of continuous atmospheric NO, NO2, and O3 measurements within the Swiss national air pollution monitoring network (NABEL)
|
1995
|
Installation of eddy covariance (EC) by R. Häsler and J. Böhm (WSL)
|
1996
|
Installation of CO2 and microclimate profile on the 35 m tower by R. Häsler and J. Böhm (WSL)
|
1997
|
Installation of automatic point dendrometer by R. Häsler, K. Herzog, and R. Zweifel (WSL)
|
1997
|
Installation of Granier-type sap flow needles by R. Häsler, K. Herzog, and R. Zweifel (WSL)
|
1997-2005
|
Continuous gas exchange measurements of branches in the tree crown by R. Häsler et al. (WSL). One branch was treated with elevated CO2 concentrations.
|
2004
|
Restart of growth, tree height, and stem diameter measurements by M. Dobbertin (WSL)
|
|
2005
|
Closed-path system of eddy covariance was replaced by an open-path system
|
2006
|
Removal of the 25 m steel frame around two trees (NFP14+)
|
2006
|
Maintenance of eddy covariance, CO2 and microclimate profiles is transfered from R. Häsler (WSL) to W. Eugster and N. Buchmann et al. (ETHZ)
|
2006
|
An area of 25 x 70 m (1750 m2) within the NE-part of the footprint of the EC site was harvested (approximately 30% weight on eddy covariance measurements) at the end of October 2006.
|
2006
|
Installation of manual and automatic circumference bands by M. Dobbertin and R. Zweifel (WSL)
|
2006
|
Partial replacement of the original type of point dendrometers (LVTD, Agricultural Electronics Corporation, USA) by a less temperature sensitive type (ZB06, Zweifel Consulting, Switzerland).
|
2006-2009
|
Integration of the site into the UN/ECE-ICP Forest Long-term forest monitoring network (LWF, WSL):
- Annual crown condition assessment (2006)
- LAI measurements (hemispherical photos, Licor LAI 2000) by A. Thimonier and M. Schmitt, WSL (2006)
- Bi-annual forest health monitoring (2007)
- Vegetation assessment every 2-4 years (2008)
- Soil parameters by S. Zimmermann (2008)
- Additional soil water conditions sensors by P. Waldner, E. Graf Pannatier (2008 and 2009)
- Additional litterfall sampling (Swiss ICP-Forest Level II plot equipment)
|
2007
|
Radiation measurement below canopy by T. Jonas (SLF/WSL)
|
2008-2009
|
Heavy truck traffic through the Seehornwald Davos research site due to construction work on a nearby avalanch protection for the railway line of the Rhätische Bahn.
|
2008
|
Stem and soil respiration measurements by S. Etzold et al. (ETHZ)
|
2009
|
Continuous stem CO2 measurements by S. Etzold (ETHZ) and R. Zweifel (WSL)
|
2010
|
New 10 year contracts with the land owners of the Seehornwald Davos research site
|
2011-2013
|
Construction work of the Hotel Stilli Davos start in July 2011 (at the edge of the footprint of the eddy tower)
|
2011
|
Data acquisition system renewed and modernised. Research cabin and site cleaned from leavings of old scientific projects, P. Plüss (ETHZ), T. Baur (ETHZ), W. Eugster (ETHZ), M. Häni (ETHZ), R. Zweifel (WSL). 23-25 August 2011.
|
2011
|
Installation of additional stem CO2 sensors, M. Häni (ETHZ), R. Zweifel (WSL). 25 August 2011.
|
