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Endangered dune slack plants; gastronomers in need of mineral water
Lammerts, E.J.; Grootjans, A.; Stuyfzand, P.; Sival, F. (1995). Endangered dune slack plants; gastronomers in need of mineral water, in: Salman, A.H.P.M. et al. (Ed.) Coastal Management and Habitat Conservation: Proceedings of the 4th EUCC Congress, Marathon, Greece: Volume 1. pp. 355-369
In: Salman, A.H.P.M.; Berends, H.; Bonazountas, M. (Ed.) (1995). Coastal Management and Habitat Conservation: Proceedings of the 4th EUCC Congress, Marathon, Greece: Volume 1. EUCC: Leiden. ISBN 90-75502-02-8. VI, 502 pp., more

Available in  Authors 
    VLIZ: Proceedings [35056]
Document type: Conference paper

Keywords

Authors  Top 
  • Lammerts, E.J.
  • Grootjans, A.
  • Stuyfzand, P.
  • Sival, F.

Abstract
    On the Dutch Wadden Sea islands endangered basiphilous dune slack species are generally found in young primary beach plains, in young dune systems with blown out slacks and in seepage areas of large hydrological systems. Many of these species have their optimum in the phytosociological association Junco baltici-Schoenetum nigricantis and require habitats with a low nutrient availability, a high pH and regular flooding. A case is presented in which basiphilous dune slack plants have existed for decades in an old dune slack situated in the centre of the island of Schiermonnikoog, where infiltration conditions prevail. A hydrological mechanism is discussed that creates alkaline conditions in natural dune slacks surrounded by old, part I y decalcified dunes. A hydrological modelling of the area was carried out and the simulated flow line pattem was compared with an interpretation of the macro-ionic composition of the groundwater of the hydrological system. The geochemical evolution of the dune water along the flow lines was interpreted from 250 water samples, most of them obtained from minifilters installed in deep borings to a depth of 24 meter below the surface. The interactions between basiphilous vegetation types and the discharge of calcareous groundwater are easily disturbed by even small changes in the local hydrological conditions. The result is a rapid acidification and the decline of endangered dune slack species.

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