1. Department of Physics of Complex Systems Eötvös Loránd University Pázmány Péter sétány 1/A BudapestH‐1117Hungary
2. Max Planck Institute for the Physics of Complex Systems Nöthnitzer Str. 38 Dresden01187Germany
3. Biological Research Centre Temesvári krt. 62 SzegedH‐6726Hungary
4. Department of Botany Hungarian Natural History Museum Könyves Kálmán krt. 40 BudapestH‐1089Hungary
5. Institute for Soil Science and Agricultural Chemistry Centre for Agricultural Research Herman Ottó u. 15 BudapestH‐1022Hungary