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Vegetation Succession on the Dunes near Oostvoorne, the Netherlands, since 1934, Interpreted from Air Photographs and Vegetation Maps

Dick van Dorp, René Boot and Eddy van der Maarel
Vegetatio
Vol. 58, No. 3 (Feb. 20, 1985), pp. 123-136
Published by: Springer
Stable URL: http://www.jstor.org/stable/20146155
Page Count: 30
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Vegetation Succession on the Dunes near Oostvoorne, the Netherlands, since 1934, Interpreted from Air Photographs and Vegetation Maps
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Abstract

The vegetation succession on the dunes near Oostvoorne, The Netherlands has been followed by means of a novel combination of repeated large-scale vegetation mapping and air photograph interpretation. Vegetation units have been discerned on the formation level because these could be distinguished fairly easily on the photographs and because the rates of change are appropriate to the time interval chosen. Nineteen formations were distinguished. Five 1:6250 maps were constructed, reflecting the formation pattern in 1934, 1943, 1959, 1972 and 1980. An overlay with 2736 grid points at 25 m field distance was used to quantify changes in the formation pattern. The results suggest a pronounced multiple pathway succession with nevertheless three principal trajectories of succession from pioneer to woodland vegetation. The outer dunes, which have originated since 1910, are distinct in successional characteristics from the inner dunes, which already existed but were released from heavy grazing pressure in 1910. The rate of change in the outer dunes was high in the beginning and is slowly decreasing eversince. In the inner dunes it went the other way around. Through visual extrapolation the likely formation patterns in 1910 and in 2000 were estimated. Transition frequencies proved highly variable for most formations. Moreover, strong spatial dependence was found. Limitations in the use of Markov models in cases of long-term succession in heterogeneous environments are discussed.

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