1. Garrotxa Volcanic Zone Natural Park; Olot Catalonia Spain
2. Department of Environment and Soil Sciences; University of Lleida; Lleida Catalonia Spain
3. IRTA Mas Badia; Agricultural Experimental Station Mas Badia; La Tallada d'Empordà Catalonia Spain
4. Ministry of Agriculture; Livestock; Fisheries and Food; Generalitat de Catalunya; Lleida Catalonia Spain