Department of Environment and Soil Sciences, University of Lleida, Av. Alcalde Rovira Roure, Lleida, E-25198, Spain ; Forestry Institute of Catalonia, Pujada del Seminari, Solsona, E-25280, Spain
Centre for Catchment and Coastal Research, Institute of Geography and Earth Sciences, The University of Wales, Aberystwyth, Llandinam Building Penglais Campus, Aberystwyth, SY23 3DB, United Kingdom
Department of Geography and Environment, University of Aberdeen, Elphinstone Road, Aberdeen, AB24 3UF, United Kingdom