H2190 - Humid dune slacks
General
General characteristics |
|
|---|---|
Common name |
Humid dune slacks |
Region |
Europe |
Water systems |
coastal waters |
Nature parameter |
Habitat types |
HR nr |
H2190 |
Fact sheet by |
K.E. van de Wolfshaar |
Description habitat
General occurrence
Various special plant communities occur in the Dutch dune slacks, depending on the development stage, calcareous deposit of the substrate, its control and hydrological circumstances. This habitat type includes a number of early stages, belonging to six different sociological plant groups. Later successional dune stages (heat land, bush and woods) belong to different habitat types (2140, 2170, and 2180 respectively). Very young, still saline covering in primary slacks belong to the habitat type H1330 - Shoran en silted grassland). Stonewort communities of the association Chariton fragile can be found in logographic clear dune slacks, drinking pools or drinking water canals. This mostly concerns California with low species richness that occur in hard, fresh to slightly brackish water, with a domination of Fragile stonewort (Chari globular is), Bristly stonewort (Chara major) or Rough stonewort (Chara aspera). This type of vegetation is also found in bomb craters on Texel, near Egmond and Voorne.
Vegetation types of the association Hydrocotylo-Baldellion, Potamion graminei and Nanocyperion flavescentis occur in calcareous dune slacks with varying ground water levels. Characteristic for the latter stonewort are various small annuals, including Allseed (Radiola linoides), Yellow centaury (Cicendia filiformis) and Chaffweed (Anagallis minima). The Potamion graminei includes plants such as Variableleaf pondweed (Potamogeton gramineus) and Lesser water-plant (Echinodorus ranunculoides). On dunes, the Hydrocotylo-Baldellion is mainly represented by Samolo-Littorelletum. Characteristic is the combination of Brookweed (Samolus valerandi), Lesser water-plant and Shoreweed (Littorella uniflora).
In young, calcareous, humid dune slacks, species rich covering occur belonging to Caricion davallianae, a higly appreciated specie by nature management. The Annex II species II - Yellow widelip orchid (Liparis loeselii) can be found in this vegetation. In addition, Black bogrush (Schoenus nigricans), March grass of parnassus (Parnassia palustris), Fragant orchid (Gymnadenia conopsea), Musc Orchid (Herminium monorchis), Early marsh orchid (Dactylorhiza incarnata), Marsh helleborine (Epipactis palustris), Northern green rush (Juncus alpinoarticulatus subsp. atricapillus), Fewflower spikerush (Eleocharis quinqueflora) and various rare moss and liverwort can be found. Mowing helps preserve the vegetation.
Environmental boundary conditions
Humid dune slacks can develop when an area of the upper beach is enclosed by the development seaward of a new dune ridge (primary dune slacks) or by wind eroded depressions in older dunes systems or in eroding systems by the landward movement of dunes ridges over stable wet sand an the water table (secondary dune slacks). #1.
Control and growth opportunities.
This habitat type is very sensitive to desiccation #1.
Dose-effect relations
As this habitat type is a landscape characteristic, these dose-effect relations have been based on habitat factors of occurring plant communities.
Flow chart
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General dose-effect relations
Uncertainty and validation
These dose-effect relations have not been validation.
Applicability
As this habitat type is a landscape characteristic, the dose-effect relations have been based on habitat factors of occurring plan communities.
Example project
At present, there is no example of a project available.
References
1 http://www.minlnv.nl/natura2000
2 Weeda, E.J., Schaminée, J.H.J., Van Duren, L.. Atlas van Plantengemeenschappen in Nederland. Deel 1. Wateren, moerassen en natte heiden. KNNV 2000.
