title: The global nitrogen cycle in the twenty-first century: introduction.
authors.affiliation: NERC, Centre for Ecology and Hydrology, Penicuik EH26 0QB, UK. dfo@ceh.ac.uk
authors.forename: David
authors.initials: D
authors.lastname: Fowler
authors.forename: John A
authors.initials: JA
authors.lastname: Pyle
authors.forename: John A
authors.initials: JA
authors.lastname: Raven
authors.forename: Mark A
authors.initials: MA
authors.lastname: Sutton
mesh_terms: D017753:Ecosystem; D008954:Models, Biological; D058458:Nitrogen Cycle; D012106:Research / Q000639:trends*
keywords: denitrification; nitrification; nitrogen cycle; nitrogen deposition; nitrogen fixation