Fig. 7. Vertical variations of potential denitrification (mg N kg^–1 dry soil d^–1) estimated from N₂O accumulation between 2 and 5 h and after 24 and 72 h in the Highway 27 riparian zone (Sites 2 and 6). See Fig. 2 for site locations. The term T indicates <0.1 mg N kg^–1 d^–1, while N indicates no activity.