1. Faculty of Environment and Natural Resources, Albert-Ludwigs-University, Freiburg, Germany
2. Department of Societal Changes, Forest Research Institute of Baden-Württemberg, Freiburg, Germany
3. Department of Agricultural Economics and Rural Development, Georg-August-University, Göttingen, Germany
4. Faculty of Organic Agricultural Sciences, Kassel University, Witzenhausen, Germany
5. Directorate, Forest Research Institute of Baden-Württemberg, Freiburg, Germany