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Mid-to late-Holocene land-use change and lake development at Dallund S0, Denmark: synthesis of multiproxy data, linking land and lake

Geological Survey of Denmark & Greenland (GEUS), Department of Quaternary Geology, 0ster Voldgade 10, DK-1350 Copenhagen K, Denmark; Dpartment of Geography, Loughborough University, Loughborough LEI] 3TU, UK; egb{at}geus.dk

Peter Rasmussen

Dpartment of Geography, Loughborough University, Loughborough LEI] 3TU, UK

Bent Vad Odgaard

Institute of Earth Sciences, University of Aarhus, C. F M0llers Alle, building 120, DK-8000 Arhus C, Denmark

Multiproxy palaeoecological data for lake Dallund S0, Denmark, were synthesized to explore the link between changes in the terrestrial environment (from pollen, and sediment physical properties) with those in the aquatic environment (from diatom, macrofossil, zooplankton and Pediastrum data) since the introduction of agriculture c. 6000 years ago. The lake was relatively insensitive to catchment disturbance during the Neolithic (3870-1700 BC) and Early Bronze Age (1700-1000 BC) periods but was dramatically impacted by environmental changes associated with a major deforestation phase at the transition from the Late Bronze Age (1000-500 BC) to the Pre-Roman Iron Age (500 BC-AD 0). A major eutrophication of the lake took place as a result of a changing agricultural system and also the retting of flax and hemp during the Mediaeval period (AD 1050-1536). Analyses of the data sets representing the terrestrial and aquatic environments demonstrate that human activities over thousands of years have not only impacted and shaped the Danish landscape but have also played a major role in lake development.

Key Words: Palaeoecology • Holocene • human impact • eutrophication • lake development • land use • Dallund So • Denmark

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