Energy crops are protecting Ringkoebing Fjord'

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Energy crops are protecting Ringkoebing Fjord.
Ringkjøbing Amt Teknik og Miljø

• Ingeborg Svennevig,
• Chief Project Manager

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Catchment area 3.500 km2 Fjord
290 km2 Water is regulated by a sluice in
Hvide Sande
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Objectives

• County council visibility between 1½-2 meter
• HD good conservation status for nature types and
  species
• VRD good environmental status
• Users want to bathe, fish, hunt etc.

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Nitrogen influx from land
Source Dansk Landbrugsrådgivning
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Actionplan from the envistigation phase
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Cost-effective action plan, 1. version
Total 1098-1356 tons/år
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Costs and (lack of) finanse
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Fytoremediering
Calculated costs in N-removal
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Energy crops, advantages and disadvantages

• Effect?
• Crop! but technique?
• Which species are adaptable and effective?
• Will the drains be ruined?
• Aestetic value?
• Market?

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Test area N-calculation
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Objective from the actions plan removal of N in
t/year
Potential for N-removal in the pumped areas 25 -
447 t N /år
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Arealanvendelse og Jordbundsforhold for Hemmet
Bæks opland
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Criteria for solutions

• - the areas must be dry enough to farm until 15.
  of October,
• the wished level of water must be reached in the
  begiing of November
• the normal farming practice can be
  re-established around the 1st of March and the
  15th at the latest

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Expected effects on the crops
Areas with drains higher than 25 cm below ground,
cannot hold winter crops. Areas with drains
between 25-50 cm, will not experience reduction
in growth under normal rainfall
conditions. Winter crops will not be affected at
all, when drains are lower than 50 cm.
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Models for solutions
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Models for solutions
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Models for solutions
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Models for solutions
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Consequences for agriculture
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N-transport, Hemmet Bæk
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Average monthly N-transport, Hemmet Bæk
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Calculated N-reduction
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Maximum potential in all the pumped areas around
the Fjord
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N-reduction and costs

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Potential in all pumped areas (6.000 ha)
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Denitrifikation

• Nitrat

Kvælstofilte
Nitrit
Lattergas
Atmosfærisk kvælstof
N2O
N2
NO
NO2
NO3
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Energien til denitrifikationen
Organisk stof nitrat brintioner ?
kuldioxid atm. kvælstof vand
5(CH2O) 4 NO3- 4 H ? 5 CO2 2 N2 7 H2O
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Effekt?
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Conclusion

• Vintervådlægning af pumpelag resulterer i øget
  kvælstoffjernelse
• Ekstern tilførsel af vand forøger
  kvælstoffjernelsen markant
• Lavtliggende arealer vil ikke kunne anvendes til
  vinterafgrøder
• Afhængig af metode kan kvælstofudvaskningen fra
  Skuldbøl Enge reduceres med mellem 413 og 6.957
  tons-N/år, svarende til 475 kg-N/ha/år
• Vintervådlægning af alle potentielle pumpelag
  kan give en kvælstoffjernelse på op til 450
  tons-N/år, som forudsat i Handleplanen
• Der må afhængig af metoden forventes et
  driftstab på mellem 9-18 og 24-47 kr./kg-N/år

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Arealtilstand efter drændybder
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