Download PDF​

PALINOLOGICAL STUDIES OF PEAT SEDIMENTS OF THE BECKLEMISHEVO DEPRESSION (CENTRAL TRANSBAIKALIA)

S. A. Reshetova, A. B. Ptitsyn

Institute of Natural Resources, Ecology and Cryology SB RAS, Chita, Russia

On the basis of detailed palynological studies and radiocarbon dating of sediments of the lake-marsh geosystem of Transbaikalia, vegetation has been reconstructed over the past 3,000 years. A high-resolution recording of the natural environment of the Beklemishevo depression in the Late Holocene was obtained. Reconstructed vegetation is similar in composition to the modern, represented by low and middle mountain light coniferous forests of pine and larch with the spread in the valley parts of meadow and meadow-steppe communities. Spruce, cedar and fir are rare on the ridges. The palynological record showed that during the accumulation of the peat layer with a thickness of 30 cm, there were no significant changes in the composition of the regional vegetation, which is in good agreement with the palynological record obtained earlier from the results of the study of bottom sediments of the Arakhley Lake. It has been established that a qualitative criterion for changing the natural environment of the Beklemishevo depression when performing paleoreconstructions on peat and bottom sediments, except for spores and pollen, may be communities of green algae of the genus pediastrum.

Keywords: palynological analysis, peat sediments, radiocarbon dating, Late Holocene, Transbaikalia.

DOI 10.20403/2078-0575-2018-4-88-94