large scale vs mosaic magement
TRANSCRIPT
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Mosaic-management in the Middel- en Oostduinen
Dynamic Dunes Oktober 2015Marten Annema
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Contents of my presentation
• Area
• Ambition
• Management
• Results
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Rotterdam
Goeree-Overflakkee
Middel- en Oostduinen
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Dune area 205 hectare (mainly grey dunes)Water collection area (sandbed <4 meter)Lime poor to calcareousMany gradients in short distance
Middelduinen
Oostduinen
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Many gradients in a short distance
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Problem
• Dessication of vulnerablevegetation
• Shrub- and grassencroachment
• Water supply
• Draining neighbourhood
• Eutrophication:
by infiltration water
by N-deposition
• lack of management
• collapse of rabbitpopulation
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Ambition of recovery management
• Restoration of grey dunes and
duneslacks
• Sufficient drinkwater for the area
• No sand drift on large scale
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Restoration- and management measures Middel- en Oostduinen
Restoration measures Management measures
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Mowing frequency Middel- en Oostduinen
We learned:Dry, undisturbed, dune vegetationsonly need grazingCalcareous dune slacks need (first 20 years?) extra mowing
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Relation red-list species vascular plants and management measures
Mozaïc management leads to a quick return of typical species, even in an intensively usedwater supply area
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Question:
Do decalcified dune slacks need
sod-cutting every 40 years?
Statement:
Large scale management leeds to the samebiodiversity as mosaic management,
it only lasts
longer.