1. Georg‐August‐University Göttingen, Faculty of Forest Sciences and Forest Ecology, Institute of Silviculture and Forest Ecology, Büsgenweg 1, D‐37077 Göttingen, Germany;
2. TU München, Centre of Life and Food Sciences, Department of Ecology, Geobotany, Am Hochanger 13, D‐85354 Freising, Germany;
3. E‐mail
4. TU München, Centre of Life and Food Sciences, Department of Ecology, Vegetation Ecology, Am Hochanger 6, D‐85354 Freising, Germany; E‐mail
5. GSF – National Research Centre for Environment and Health, Institute of Ecological Chemistry, Ingolstaedter Landstrasse 1, D‐85764 Neuherberg, Germany;