1 Forest Ecology and Forest Management Group, Wageningen University Wageningen, Netherlands.
2 Landscape Dynamics Unit, Swiss Federal Institute for Forest, Snow and Landscape Research WSL Birmensdorf, Switzerland.
3 Department of Forest Yield and Silviculture, Slovenian Forestry Institute Ljubljana, Slovenia.
4 CREAFCerdanyola del Vallès, Spain; Laboratory of Plant Biology and Nature Management, Vrije Universiteit BrusselBrussels, Belgium; Laboratory of Wood Biology and Xylarium, Royal Museum for Central AfricaTervuren, Belgium.
5 Laboratory of Plant Ecology, Department of Applied Ecology and Environmental Biology, Faculty of Bioscience Engineering, Ghent University Ghent, Belgium.
6 Department of Geography and Geosciences, Friedrich-Alexander-University Erlangen-Nuremberg Erlangen, Germany.