Abstract
Iron Age de-settlement in Halsingland, Northern Sweden, can be regarded as a good analogue for the possible effects of land-use and vegetational changes on lake acidification without the effect of contemporary atmospheric pollution. Pollen analyses were used to identify vegetational change associated with a de-settlement period
ca
. 500 A. D. and diatom analyses to assess if there was any associated change in lake-water pH. A clear settlement horizon was found in the two lakes studied, indicating catchment disturbance associated with Iron Age agriculture. There was no change, however, in diatom reconstructed pH after de-settlement, during vegetation regeneration, when it has been postulated that the build up of raw humus and change of ion-exchange conditions would result in acidification. Importantly, one of the lakes began to acidify, before liming, under contemporary levels of acid deposition.
Subject
Industrial and Manufacturing Engineering,General Agricultural and Biological Sciences,General Business, Management and Accounting,Materials Science (miscellaneous),Business and International Management
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