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Effects of groundwater manipulation on soil processes and vegetation in wet dune slacks
van Beckhoven, K. (1992). Effects of groundwater manipulation on soil processes and vegetation in wet dune slacks, in: Carter, R.W.G. et al. (Ed.) Coastal dunes: geomorphology, ecology and management for conservation: Proceedings of the 3rd European Dune Congress Galway, Ireland, 17-21 June 1992. pp. 251-263
In: Carter, R.W.G. et al. (Ed.) (1992). Coastal dunes: geomorphology, ecology and management for conservation: Proceedings of the 3rd European Dune Congress Galway, Ireland, 17-21 June 1992. A.A. Balkema [etc.]: Rotterdam. ISBN 90-5410-058-3. 533 pp., more

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    Marine

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  • van Beckhoven, K.

Abstract
    Large partS of the Dutch dune system have been subjected to a considerable drop of the ground-water table due to various human activities. The desiccation of the dune system has lead to a large decline of the wet dune slack plant species like Schoenus nigricans and Parnassia palustris and an increase of populations of Calamagrostis epigejos. At this moment plans are made for a rise of the water table in the near future. In this paper results are presented of both field observations and manipulative experiments with respect to the conditions required for a successful re-establishment of a characteristic dune slack vegetation. In a height gradient in a dune slack with four vegetation zones, the dehydrogenase activity was seasonal, with high activity in the winter. The activity was lowest on the dune ridge with Ammophila arenaria and highest in a zone with Festuca rubra. In the Schoenus nigricans zone the dehy-drogenase activity of the soil was low compared to the F. rubra and the Rubus caesius zone. In the laboratory, an incubation test with soil from the zone with S. nigricans increasing soil moisture and a negative correlation for nitrogen mineralisation. In a growth experiment the presence of S. nigricans reduced the growth of C. epigejos under wet conditions. If C. epigejos however, was growing in monoculture its growth was even better under wet conditions than under moist conditions. In presence of S. nigricans the dehydrogenase activity of the soil was not only low in the field but also in wet and moist soils of the growth experiment. The presence of S. nigricans in dune slacks can be positive for regeneration because its presence reduces the growth of C. epigejos and has an impact on microbial soil processes.

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