1. Leibniz Centre for Agricultural Landscape Research (ZALF), 15374 Müncheberg, Germany
2. Leibniz Institute of Agricultural Development in Transition Economies (IAMO), Halle (Saale), 06120 Germany
3. Department of Resource Economics, Albrecht Daniel Thaer-Institute of Agricultural and Horticultural Sciences, Humboldt-Universität zu Berlin, Berlin, 10115 Germany
4. Department of Urban Plant Ecophysiology, Albrecht Daniel Thaer-Institute of Agricultural and Horticultural Sciences, Humboldt-Universität zu Berlin, Berlin, 10115 Germany