Figure 2From: Terrestrial denitrification: challenges and opportunitiesDenitrification of land-based N sources in terrestrial, freshwater, and marine ecosystems globally shows that terrestrial ecosystems (soils) and the interface between terrestrial and aquatic environments (groundwater, lakes and rivers) dominate global denitrification in terms of mass flux (a) and as a percentage of land-based N sources (b). From Seitzinger et al. (2006).Back to article page