of the XIX — XXI century

Arefyev S.P., Zakh V.A. (Tyumen, Russian Federation)

The article analyzes tree-ring chronologies of contemporary pines growing on different hypsometric marks in relation to the modern level of the Andreevskoe lakes, on the low-ridges of terrace-like formations, floodplain lowlands and riams. The tree-ring chronologies from these areas, their correlation, dependence of the width of the rings on various natural factors, such as fires, harmful insects and fluctuation of groundwaters itself, reflecting the level of lakes in the Andreevskoe lake system are described. As a result of the study, 8 tree-ring chronologies were made, ecological and biological regularities were found out determining the formation of annual pine rings in the lake area due to a change in its level. The longest chronology of the lake coast for 197 years (since 1821) confirmed low water level in the lake, recorded on the map of surveyor Vasily Filimonov, created in November 1829. The use of chronologies was analyzed based on the difference in width of the annual pine rings according to the principle of contrasting biotopes (high — low, dryland — peatland), limited possibilities for reconstructions of this type based on individual ring chronologies are shown. A 174-year-old difference chronology (since 1843) was created, verified by a number of historical evidence, results of studies of lakes in the south of Western Siberia and cartographic material of the recent decades. The difference created chronology is recommended as a basis for reconstruction of the lake's level regime (possibly in combination with certain ring chronologies), although the fluctuation amplitudes can be specified for further dendrochronological reconstructions using old construction timber and fossil wood (in peat bogs).

Key words: Andreevskoe lake system, tree-ring chronologies, annual rings, fires, harmful insects, lake water level.

DOI: 10.20874/2071-0437-2017-39-4-161-171

11.12.2017

S.P. Arefyev

Tyumen Scientific Centre of Siberian Branch RAS, Malygina st., 86, Tyumen, 625026. Russian Federation

E-mail: sp_arefyev@mail.ru

V.A. Zakh

Tyumen Scientific Centre of Siberian Branch RAS, Malygina st., 86, Tyumen, 625026. Russian Federation

E-mail: viczakh@mail.ru