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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

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Denitrification from the root zone to streams

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  1. Plant Congress 2006 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 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

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

  4. N-retention (%) i 26 catchments FromFYNS AMT

  5. Measured N-reduction inRiparian Areas (Hoffmann, 1998)

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

  7. Outline of groundwater flow through riparian areas

  8. Riparian area

  9. 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

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