1. Forest & Nature Lab; Ghent University; Gontrode-Melle Belgium
2. Southern Swedish Forest Research Centre; Swedish University of Agricultural Sciences; Alnarp Sweden
3. Jules Verne University of Picardie; UR Ecologie et Dynamique des Systèmes Anthropisés (EDYSAN FRE 3498 CNRS); 1 rue des Louvels F-80037 Amiens Cedex 1 France
4. Department of Physical Geography and Quaternary Geology; Stockholm University; Stockholm Sweden
5. Sylva nurseries BVBA; Waarschoot Belgium
6. Vegetation Ecology and Conservation Biology; Institute of Ecology; FB2; University of Bremen; Bremen Germany
7. Biodiversity Research / Systematic Botany; Institute of Biochemistry and Biology; University of Potsdam; Potsdam Germany
8. Institute of Land Use Systems; Leibniz-Centre for Agricultural Landscape Research (ZALF); Müncheberg Germany
9. Department of Agrifood Production and Environmental Sciences; section of Soil and Plant Sciences University of Florence; Firenze Italy
10. Department of Biology Norwegian University of Science and Technology; Trondheim Norway
11. Institute of Biochemistry and Biology; University of Potsdam; Potsdam Germany