1. CIFOR-INIA. Ctra de la Coruña; Km 7,5 28040 Madrid Spain
2. Forest Ecology and Restoration Group; Department of Life Sciences; University of Alcala; Science Building Campus Universitario 28871 Alcalá de Henares Madrid Spain
3. Center for Forest Research; Université du Québec à Montréal; PO Box 8888, Centre-Ville Station Montréal QC H3C 3P8 Canada
4. Instituto de Recursos Naturales y Agrobiología de Sevilla (IRNAS); CSIC; PO Box 1052 41080 Seville Spain
5. Max Planck Institute for Biogeochemistry; 07745 Jena Germany