Vegetation development influenced by grazing in the coastal dunes near The Hague, The Netherlands |
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Authors: | A. J. de Bonte A. Boosten H. G. J. M. van der Hagen K. V. Sýkora |
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Affiliation: | (1) Department of Environmental Sciences, Plant Ecology and Nature Conservation Group, Wageningen Agricultural University, Bornsesteeg 69, 6708 PD Wageningen, The Netherlands;(2) Dune Water Company of South Holland, Office of Nature and Landscape Conservation, P.O. Box 34, 2270 AA Voorburg, The Netherlands |
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Abstract: | In 1990, grazing was introduced in a section of Meijendel, a coastal sand dune system near The Hague, The Netherlands. After five years an evaluation was made of the effects of grazing on vegetation development. Three transects were established, two in grazed areas and one in an ungrazed area. Field survey data were classified by means of TWIN-SPAN, ordinated with Detrended Correspondence Analysis and the resulting vegetation types interpreted according to Westhoff & den Held (1969). All associations were found in both the grazed and the ungrazed areas, but at the subassociation and variant level some communities appeared to be restricted to the grazed area. These variants were five grassland variants characterized by disturbance indicators such asSenecio sylvaticus andCynoglossum officinale. The total number of plant species in the 19 permanent plots, which had been observed to have been decreasing since 1960, showed a considerable increase after the introduction of horses and cows in 1990. A marked decrease in the cover ofCalamagrostis epigejos andCarex arenaria since 1990 was evident, while in some plots species such asRibes rubrum andViburnum opulus increased considerably. A series of false-colour aerial photographs were used to compare vegetation structure in the three transects between 1990 and 1995. In the grazed area the tall grass vegetation had almost totally disappeared, whereas the areas of open sand. sand with moss and lichens, and low grass vegetation had increased and the pattern had become more fine-grained. In the ungrazed area the area covered by low grass vegetation had increased at the expense of the area of sand with moss and lichens and the pattern had become more coarse-grained. |
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Keywords: | Cattle grazing Detrended Correspondence Analysis Horse grazing Meijendel Nature management TWIN SPAN Vegetation pattern |
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