Ozone and nitrogen deposition from Colorados Craig powerstation.
Assessment of nitrogen deposition at natura 2000 sites
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Assesment of additional Nitrogen-deposition in Natura 2000
Gerard Smit, Rob Lensink (Bureau Waardenburg)Jeroen van Rooij
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Natura 2000
• A European Network
N2000 area's are located all over the Netherlands.
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Natura 2000
•Targets fort the Favourable Conservation Status of
- Habitat types
- Species of appendix 2
- bird species
Foto heide
For habitats as heath land targets are defined to sustain or develope the Favourable Conservation status.
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Natura 2000
Quality of habitat types• Abiotic environment (ground water, soil)• Management (cutting, mowing, burning ...)• external factors as Nitrogen-deposition
Hydrology
Ndep
ManagementSoil
Habitats are dependent of carefull management. Most are man made.
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N-deposition
• Back ground deposition (1.000 – 3.000 mol N/ha/jr)
The back ground deposition is high. In average the equivalent of 25 kg artificial fertiliser drops annualy from the sky, free for all.
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N-deposition
• Critical Nitrogen load (517 - >2.400 mol N/ha/jr)
Nature at Pleistoceen soils is more sensitive to high Nitrogen values as nature in the western part of the Netherlands.
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Sources of NitrogenAverage contribution to Nitrogen deposition in the Netherlands
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Sources of NitrogenAverage contribution to Nitrogen deposition in the Netherlands
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Sources of NitrogenExamples of project effects at Natura 2000Creating Bankprotection at Oosterscheldekering local 1,5-2 mol/ha/yr
Diesel motor brick breaker 0,051 mol/ha/yr at approximate 8 km
Carpet factory 8-10 mol/ha/yr at 500 meter
Extension of a motorway (+3.000 mvt/24hr) 2-3 mol/ha/yr at ca. 5 km
Sand production in riverbed 5-10 mol at 750 meter
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Sources of Nitrogen
• Additional deposition (0 – 10 mol N/ha/yr.)
1 mol = 14 gram(3 bags of sugar)
The contribion of assessed projects is often not more than a few mol.
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The perception of ...
• Background deposition ca 2000 mol/ha/yr
• Contribution a few mol: 1 mol is 14 gram
• Can you find 14 gram at 1 ha (2 soccer fields)?
Every year a bag of artificial fertiliser is added to two soccer fields. Wat is the added value of extra Nitrogen with the amount of a few sugar bags?
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Effect assessment
• Relevant parameters for quality of habitat
• Magnitude of additional Nitrogen
• Difference in background and Critical Load of habitat
• Legal perceptive
• Ecological perceptive
Spatial deposition values, and measures for quality defined in Natura 2000 management plans are key factors voor the assessment.
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A2 Leenderheide - Valkenswaart• In and near the verge of the highway heath of good quality (kdw
1.071 mol)
• Measures of N2000 management aims at improving vegetation management and hydrology.
• Though strong exceeding of Critical Nitrogen Load good quality of habitat exist near the highway.
• Good quality of habitat due to recent management.
• Local variation in Ndep, higher than project contribution.
• Project contribution is limited (0,1% - 0,3 % of CDV) comparing to local variation.
• Autonome development Ndep is favourable.
• Effects at efficiency of vegetation measures for quality improvement can be excluded.
• Effects at targets for FCS, improving quality of heath, can be excluded.
The quality of the heath vegetation was mapped to a distance of 500 m of the highway.
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Small scale urban development Breda
• Private car in 2015: 0,0327 gram NH3 and 0,30 gram NOx per km
Private heating emission
• Average per houshold: 1,72 kg NOx per year (CBS)
Supplementary emission • Respiration and transpiration of humans and pets, cleaning material
(www.emissieregistratie.nl)
Urban development - Nitrogen sources
Transport
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Adjacent to N2000-area
28 housholds
220 vehical transports/day
0,05 mol/ha/year at 500 meter
Sensitive habitat is outside 500 m range and potential habitat is outside 500 meter range, key factors for quality are hydrology and forest management. No effects of urban development.
Small scale urban development Breda
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Conclusion
• The ecological reality differs from legal reality
• An additional few mol has no ecological relevance
• Key factors for habitat quality determine the magnitude of ecological effects
• Vegetation management often mitigate effects
• To reduce emission a generic policy is most important.
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