The multi-annual nitrogen budget of a peat-covered catchment - Changing from sink to source?

► This study considered the total N budget of a peat catchment over the period 1993 to 2009. ► Fluvial flux was greater than the atmospheric input in 3 years of the study. ► Overall, the total N budget of the peat ecosystem varied from − 1.0 to + 2.5 tonnes N/km2/yr. ► In some years the ecosystem was a net source of N.