Scheme for the calculation of the ecosystem potentials (EPs). (a) Nitrogen retention potential (Orlikowski et al. 2011). (b) Sediment retention potential (Halbfass and Grunewald 2008). (c) Runoff retention potential (USDA, 2004), and (d) yield potential (Baja et al. 2001; Bartolini and Borselli 2009; Mueller et al. 2010). Grey background indicates that (b) and (c) were implemented in Lorz et al. (2012b).