Affiliation: | 1. Laboratory of Atmospheric Chemistry, Ecosystem Fluxes, Paul Scherrer Institute, Villigen, Switzerland;2. Bavarian State Institute of Forestry, Freising, Germany;3. Ecophysiology of Plants, Department Ecology and Ecosystem Management, Technische Universit?t München, Freising, Germany;4. Swiss Federal Institute for Forest, Snow and Landscape Research WSL, Birmensdorf, Switzerland |