[1] Univ Tras Os Montes & Alto Douro, Ctr Invest & Tecnol Agroambientais & Biol, Vila Real, Portugal
[2] Univ Tecn Lisboa, Inst Super Agron, Ctr Ecol Aplicada Prof Baeta Neves, P-1100 Lisbon, Portugal
[3] Univ Glasgow, Solway Ctr Environm & Culture, Dumfries, Scotland
[4] Univ Turin, Dipartimento Sci Agr Forestali & Alimentari, Grugliasco, Italy
[5] Ctr Invest Forestal Lourizan, Xunta De Galicia, Pontevedra, Spain
[6] INRA, Ecol Forets Mediterraneennes UR629, Avignon, France
[7] Cornell Univ, Dept Biol & Environm Engn, Ithaca, NY USA
[8] Univ Lleida, Dept PVCF, Lleida, Spain