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1 Polish Journal of Ecology

1 2007

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Holocene pattern of organic carbon accumulation in a small lake in Estonia

Punning Jaan_Mati, Koff Tiiu, Sakson Maire, Kangur Mihkel

Polish Journal of Ecology

2007

Vol. 55, nr 1

5-14

A comprehensive study of the sediment profile of L. Viitna Linajarv, a small closed drainage lake located in northern Estonia (59 [deegres] 27.N, 25 [deegres] 01.E), was conducted to assess the impact of water-level changes on the carbon accumulation dynamics in the lake during the Holocene. The variations of the P content, C/N ratio, fossil pigments and diatom communities indicate essential changes in the lake ecosystem history during the Holocene. The results show that on millennial time-scale (10[^3] years) fluctuations of the lake level, concurrent shore erosion and coprecipitation of dissolved organic matter with allochthonous mineral particles were the driving factors in the lake history. Net organic carbon accumulation was [similar to] 30 g m[^-2] yr[^-1] at the beginning of the Holocene (ca 9000 BP), then decreased to 10 g m[^-1] yr[^-1] (5000-2000 BP) and increased in the upper layers (since 1000 BP) up to 60 g m[^-2] yr[^-1].