Proceedings of the Symposium on Global and Environmental Monitoring: Proceedings of the Symposium on Global and Environmental Monitoring

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Persistent identifier:: 856665355

Title:: Proceedings of the Symposium on Global and Environmental Monitoring

Sub title:: techniques and impacts ; September 17 - 21, 1990, Victoria Conference Centre, Victoria, British Columbia, Canada

Year of publication:: 1990

Place of publication:: Victoria, BC

Publisher of the original:: [Verlag nicht ermittelbar]

Identifier (digital):: 856665355

Language:: English

Document type:: Multivolume work

Volume

Persistent identifier:: 856669164

Title:: Proceedings of the Symposium on Global and Environmental Monitoring

Sub title:: techniques and impacts; September 17 - 21, 1990, Victoria Conference Centre, Victoria, British Columbia, Canada

Scope:: XIV, 912 Seiten

Year of publication:: 1990

Place of publication:: Victoria, BC

Publisher of the original:: [Verlag nicht ermittelbar]

Identifier (digital):: 856669164

Illustration:: Illustrationen, Diagramme, Karten

Signature of the source:: ZS 312(28,7,1)

Language:: English

Usage licence:: Attribution 4.0 International (CC BY 4.0)

Editor:: International Society for Photogrammetry and Remote Sensing, Commission of Photographic and Remote Sensing Data

Publisher of the digital copy:: Technische Informationsbibliothek Hannover

Place of publication of the digital copy:: Hannover

Year of publication of the original:: 2016

Document type:: Volume

Collection:: Earth sciences

Chapter

Title:: [WP-2 LAND USE AND LAND COVER]

Document type:: Multivolume work

Structure type:: Chapter

Chapter

Title:: LANDSCAPE SUCCESSION IN A DUTCH DUNE AREA. L. H. W. T. Geelen

Document type:: Multivolume work

Structure type:: Chapter

SP® w LANDSCAPE SUCCESSION IN A DUTCH DUNE AREA L.H.W.T. Geelen Municipal Waterworks Amsterdam Vogelenzangseweg 21 2114 BA Vogelenzang The Netherlands ABSTRACT In a case study in the Amsterdam Waterwork Dunes, The Netherlands the landscape succession has been analysed by means of aerial photographs of 1938,1958,1968, 1979 and 1985. In 1985 field studies were carried out to check the later analysis. In the thirties and fourties of this century, the vegetation structure was mainly open (dry dune grasslands). Since the mid-fifties this dominating open vegetation has been more and more encroached by variable patterns of open low shrub. During the last decennia the diver sity in vegetation structures increased by the local development of open low shrub into more dense and/or taller shrub vegetation. During the last 50 years the coverage of the treelayer increased proportionally by the development of small deciduous woodlands and the planting of pine forest. A great number of factors is affecting vegetation structure development: (meso)climate, relief, hydrology, soil, fauna and man. In the study area hydrology has been of special importance. Dunewater catchment has led to a significant lowering of the groundwater table during the first half of this century. Later on, it raised again as a result of changed hydrological management. Grazing has also been of great influence , especially the termination of cattle- and sheepgrazing in 1920. Moreover the sudden decrease of rabbit grazing,as a result of myxoma tosis disease since 1954, has favoured the growth of woody species. If this shrub vegeta tion continues to increase,probably the present-day management of "doing nothing" has to be changed, to prevent further loss of the diversity of vegetation structures. Maybe stock grazing and/or the development of blowouts can be used as managment tools to retard succes sion and reintroduce the characteristic young dune phases. KEY-WORDS : dune landscape, aerial photographs, vegetation structure, succession. 1 INTRODUCTION The Municipal Waterworks of Amsterdam are catching drinking water in a part of the Dutch coastal dunes; the so called Amster dam Waterwork Dunes (AWD) (fig.l). These dunes are also important for coastal defen ce, nature conservation and recreation. The Municipal Waterworks only recently considered nature conservation to be one of their tasks. This explains the lack of historical field data. There are no vegeta tion maps before 1980. To develop an adequate dune management however, insight is required in the changes of landscape, vegetation, hydrology and so on. This is very difficult when no field data are available. Thanks to the impor tance of the dune area for sea- and mili tary defence, old stereoscopic aerial pho tographes were available of 1938, 1958, 1968, 1979 and 1985. The next two questions will be tackled: 1) HOW CAN CHANGES IN LANDSCAPE AND VEGETA TION BE TRACED BY THESE PHOTOGRAPHS ? 2 2) DO THE AERIAL PHOTOGRAPHS GIVE SUFFI CIENT INFORMATION TO DEVELOP AN ADEQUATE DUNE MANAGEMENT ? 2 INVESTIGATION AREA To answer these questions a case study was started (Ehrenburg & Geelen, 1986). The study site (176 ha) is imbedded in the Amsterdam Waterwork Dunes. The distance to the North Sea is about 800-1800 meters. The origin of this location goes back to the 13-15th century. In this period sand drift must have formed, mostly, this younger grey dune landscape, as we can recognize it nowadays.The area is characterized by se condary parabolic dune systems. Seaward younger landscapes can be recognized , whereas the inner dunes are much older. fig. 1 The location of the study area. Amsterdam, hatched= coastal dunes. 1= 364

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