“…Nevertheless every model is able to generate at least a few indicators covering one or more sustainability principles (e.g. Pennanen et al, 2007, andHummel et al, 2006, for the forest area and condition; Chertov et al, 2007, andMerganicova et al, 2005, for carbon and nitrogen cycles and water relations; , for production function; Elemans et al, 2007, andKint et al, 2009, for ecological function;Van Deurzen et al, 2007, for protection function;García Quijano et al, 2005, for socioeconomic function).…”