A late Holocene record of land-use history,soil erosion,lake trophy and lake-level fluctuations at Bjäresjösjön (south Sweden) |
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Authors: | M-J Gaillard J A Dearing F El-Daoushy M Enell H Håkansson |
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Institution: | (1) Dept. of Quaternary Geology, University of Lund, Tornavägen 13, S-22363 Lund, Sweden;(2) Dept. of Geography, Coventry Polytechnic, Priority Street, CV15FB Coventry, UK;(3) Dept. of Physics, University of Uppsala, Box 530, S-75121 Uppsala, Sweden;(4) Swedish Environmental Research Institute, Box 21060, S-10031 Stockholm, Sweden |
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Abstract: | Land-use history, soil erosion, lake trophy and lake-level fluctuations during the last 3000 years were reconstructed through a multidisciplinary palaeolimnological study (pollen, plant macrofossils, diatoms, physical and chemical analysis, magnetic measurements and radiometric methods) of a small eutrophic lake in southern Sweden (Bjäresjösjön, Scania). There are striking responses in diatom, chemical, sediment yield and magnetic records to land-use changes documented by pollen analysis or historical sources, and to lake-level changes identified from sedimentary changes. Our multidisciplinary approach assists interpretation of the processes controlling long-term changes and separation of the effects of different factors (land-use changes, lake-level fluctuations) on individual biostratigraphical records. Climate has controlled processes in the lake indirectly, through lake-level fluctuations, from the Late Bronze Age to the Viking Age (700 BC-AD 800). Since the Viking Age, land-use controlled most of the changes observed in the lake's development and soil erosion processes. Major changes in lake development occurred during the last 200 years, due to a drastic increase in soil erosion and water eutrophication during a period of agricultural modernization. |
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Keywords: | South Sweden Late Holocene catchment history soil erosion lake trophy lake-level fluctuations palaeolimnology |
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