[1] Aristotle Univ Thessaloniki, Fac Forestry & Nat Environm, Thessaloniki 54124, Greece
[2] Santiago de Compostela Univ, Lugo 27002, Spain
[3] European Forest Inst, Joensuu 80100, Finland
[4] Cranfield Univ, Cranfield MK43 0AL, Beds, England
[5] Agr Univ Athens, Karpenissi 3600, Greece
[6] CNR, Inst Res Terr Ecosyst, Porano, TR, Italy
[7] CNR, Inst BioEcon, Via G Caproni 8, Florence, Italy
[8] Agroscope, Dept Agroecol & Environm, CH-8046 Zurich, Switzerland
[9] Univ Lisbon, Sch Agr, Forest Res Ctr, Lisbon, Portugal
[10] MV Agroecol Res Ctr, Mertola, ES, Brazil