Abstract
Investigations of glacial lake sediments located near the modern altitudinal boundary of a larch forest (between 750–810 m absolute elevation) reveal continuous records of the vegetation and climate changes over the last 12000 years in the area of the Okhotsk-Kolyma divide. For the first time, the pollen accumulation rates (PAR), which are suggestive of pollen productivity, were used as a key indicator to interpret the response of alpine plant communities to climate changes. The palynological data imply that several forest line fluctuations of ∼100–200 m occurred during the Holocene. A belt of tundra dominated by shrub pine was first established beyond the forest line near 7650 ± 50 BP. The abrupt appearance of the shrub pine in the studied area is characteristic of a sharp vegetation boundary found in other records from the north of the Far East that corresponds to the Boreal-Atlantic boundary of the Holocene. The birch pollen zone, which occurs in the earlier portions of the records, is characteristic of the transition from the Pleistocene to the Holocene.
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Original Russian Text © P.M. Anderson, A.V. Lozhkin, P.S. Minuyk, A.Yu. Pakhomov, 2014, published in Tikhookeanskaya Geologiya, 2014, Vol. 33, No. 6, pp. 70–80.
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Anderson, P.M., Lozhkin, A.V., Minuyk, P.S. et al. Environmental changes of the Okhotsk-Kolyma divide from glacial lake sediments during the Holocene. Russ. J. of Pac. Geol. 8, 464–474 (2014). https://doi.org/10.1134/S1819714014060025
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DOI: https://doi.org/10.1134/S1819714014060025