Davos Seehornwald - Switzerland
The LWF research programme provides, on the one hand, long-term data series from the last 20 years, together with a scientific interpretation to national and international policy makers. On the other hand, the available data and latest LWF infrastructure provide an attractive scientific platform for collaboration with both national and international partners. The site is located close to the city of Davos in the canton of Graubuenden, within a natural, coniferous forest stand which mainly consists of 200-390 year-old spruce (Picea abies) trees. Among others, the site is equipped with two meteorological measurement stations; one is located within the forest stand, the second is co-located in the nearby open-field, allowing to measure the forest stand effect on micro-climate. The following parameters are being measured (starting-end year): Atmospheric deposition (throughfall and bulk deposition) (2009-today), Circular vegetation plots (2008-today), Crown Condition Assessment (2006-today), Diameter and Height measurements (2004-today), EC-5 soil water content measurement (2008-today), EC-5 soil water content measurement (2008-today), Foliar analyses (2007-today), Leaf area index (LAI) (2008-today), Litterfall (2009-today), Manual circumference band measurement (2006-today), Matric potential (manual suction cups) (2009-today), O3 Injuries (2009-today), Ozone visible injury assessment (2009-today), Permanent vegetation quadrats (2008-today), Phenological observations (2009-today), Sapflow measurements (1998-today), Soil matrix chemistry (2007-today), Soil solution chemistry (lysimeters) (2010-today), Tree core sampling (), automated point dendrometer measurements (1998-today), automatic circumference band measurement (2006-today), Deadwood sampling (2009-today).
General Characteristics, Purpose, History
The forest site "Davos Seehornwald" has been installed in 2006 as part of the Swiss Long-term Forest Ecosystem Research Programme LWF. The programme investigates anthropogenic and natural forces on the long-term health of the forests and the potential risks to humans. For this, a profound understanding of the relationship between processes, causes and effects in the ecosystem are necessary. The objectives of the LWF research programme include (i) early detection and a representative assessment of changes in forest condition, (ii) determination of external influences, both from anthropogenic and natural sources such as element inputs and climate and their effect on the forest ecosystem, (iii) development of indicators to assess the condition of the forest, (iv) integrated risk assessment based on different stress scenarios, and (v) extended platform for internal and external research projects. The research site Davos Seehornwald offers a unique combination of ongoing long-term measurements of regional climate (since 1876), CO2 and microclimate profiles through the forest incl. soil temperatures and soil water potentials (since 1996), tree physiological records such as sap flow and continuous stem radius changes (since 1998), turbulent fluxes of CO2, H2O (since 1997) and CH4, N2O (since 2014) by eddy covariance, continuous atmospheric NO, NO2 and O3 concentrations (since 1991), aerosol concentrations (PM10) since 2017, and multiple properties of the vegetation (e.g. crown transparency, litter-fall, rain depositions) and soil structure (since 2004). Additionally, continuous gas-exchange of twigs was measured under ambient and increased CO2 concentrations from 1997 to 2005. The very long continuous track record of most measurements makes this research site to a predestined location for investigations about (missing) links between climate change and tree physiological adaptations and to a hot spot for addressing questions about the ecosystem carbon balance in relation to soil related components and tree physiological processes (under changing environmental conditions).
Affiliation and Network Specific Information
ILTER✔This site is a verified "ILTER" member.
LTER Europe✔This site is a verified "LTER Europe" member.
ICOS✖ (http://meta.icos-cp.eu/ontologies/stationentry/ES/DAV)The affiliation of this site with "ICOS" is not verified.
LTER Switzerland✔ (LTER_EU_CH_006)This site is a verified "LTER Switzerland" member.