[1] Univ Lleida, Dept Crop & Forest Sci, Ave Alcalde Rovira Roure 191, E-25198 Lleida, Spain
[2] Joint Res Unit CTFC, AGROTECNIO, CERCA, Ctr Sant Llorenc Morunys Km 2, Solsona 25280, Spain
[3] Forest Sci & Technol Ctr Catalonia, Ctr Sant Llorenc Morunys Km 2, Solsona 25280, Spain
[4] CREAF, Bellaterra Cerdanyola Valles, E-08193 Catalonia, Spain