Stages of the Vegetation Changes in the Interfluve of Varzuga and Strelna Rivers and Depression of the Lake Sergozero during Holocene (According to Pollen Data)

We studied three cores of peat bogs in the interfluve of the Varzuga and Strelna rivers and the depression of Sergozero Lake with palynological method. Thus allows us an assessment of characteristics of the main stages of vegetation development during the Holocene and Post Glacial time. An assumption has been made about the Preboreal age of the limnoalluvial strata in the interfluve of Varzuga and Strelna, which covers on the sediments of the Last Glacial till. Two radiocarbon dates were obtained, the beginning of peat accumulation in the studied area is dated. The bottom part of peat exposed in slope of the Sergozero Lake terrace dated to 11645–11589 cal. BP. At the same time, pine forests developed in the surrounding area. Peat accumulation reached its maximum development in the Atlantic period. At that time, spruce-pine communities with boreal flora elements dominated the territory. In the pollen spectra correlated to Subboreal time, the thermophilic flora disappears. For the correct interpretation of the results of palynological analysis, subrecent surface samples were taken. Their spectra show a high degree of correlation with each other, reflecting the existence of modern pine communities in the studied area.

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