Denitrification from the root zone to streams

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Presentation transcript:

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

Nitrate reduction from the root zone to the sea Nitrate reduction: about 100.000 tonnes N/year Nitrate leaching from the root zone: 168.000 tonnes N/year N run off to the sea: 67.000 tonnes N/year

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

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

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

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

Outline of groundwater flow through riparian areas

Riparian area

Conclusion N-reduction for DK about 100.000 tonnes N per y N-retention between root zone and streams sandy catchments 38 - 89 % loamy catchments 12- 47 % geology, discharge, tile drainage, lakes and wetlands/riparian areas Riparian areas reduction 32 - 2,100 kg N/ha/year N-load, geology, groundwater flowpath