1. Denitrification from the root zone to streams
Plant Congress January 10 and 11, 2006
Denitrification from the root zone to streams
Gitte Blicher-Mathiesen
NERI
Department of Freshwater Ecology

2. Nitrate reduction from the root zone to the sea
Nitrate reduction: about tonnes N/year
Nitrate leaching from the root zone: tonnes N/year
N run off to the sea: tonnes N/year

3. Nitrate reduction occurs
in aquifers
in wetlands and riparian areas
in the stream bottom
during water transport in streams and lakes

6. N-retention (%) i 26 catchments
From FYNS AMT

13. Measured N-reduction in Riparian Areas
(Hoffmann, 1998)

14. Measured N-reduction i Riparian Areas, irrigated with drain - or stream water
(Hoffmann, 1998)

16. Outline of groundwater flow through riparian areas

17. Riparian area

22. Conclusion N-reduction for DK about 100.000 tonnes N per y
N-retention between root zone and streams
sandy catchments %
loamy catchments %
geology, discharge, tile drainage, lakes and wetlands/riparian areas
Riparian areas
reduction ,100 kg N/ha/year
N-load, geology, groundwater flowpath