'The Journal of Transdisciplinary Environmental Studies' (TES)
Volume 1, Number 1, May 2002

ISSN 1602-2297

Indicators of the Long-term
Eutrophication of a Danish Lake (Karlsø),
and Water Pollution Management

Henning Schroll, Professor,
Department of Environment, Technology and Social Studies, Roskilde University, Denmark,
E-mail: schroll@ruc.dk

Abstract: Karlsø (Karl’s lake) in Denmark has been subjected to domestic and agricultural wastewater discharges for many years. The composition of water plants has changed, and the lake has been less clear. Two types of methods are used to describe this transformation. The first is a historical survey of activities in the watershed and the environmental regulation of the lake. The other type of method includes chemical and biological indicators among which are phosphorous and pollen measured in a sediment core to infer past environmental changes. Since the 1960’s the lake has developed from an oligotrophic to a eutrophic lake, and environmental management has not succeeded in sustaining the water visibility in the summertime.

Key Words: Lake eutrophication, indicators, phosphorous, pollen, historical data, water pollution management

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