Methods for paleoreconstruction of climates and vegetation of the Holocene (using the example of the Krasnoyarsk Basin)

Abstract

We present geochemical studies of sediments in the valley of the Berezovka River (Krasnoyarsk forest-steppe), and the continuous accumulation that occurred at the Late Pleistocene-Holocene (from 20833 ± 519
calendar years ago). The nature and conditions of formation of deposits on the left bank terrace of the river Yenisei of the Krasnoyarsk forest-steppe based on an analysis of the general characteristics and features of the macromorphological structure have been determined. There are detailed geobotanical description data of a sample plot of forest-steppe landscapes in the territory of the Krasnoyarsk depression, which is least susceptible to anthropogenic impact, and spore-pollen spectra (SPS) of surface samples to assess the reflection of the composition of vegetation in the spectra. To establish the reliability of the data obtained, the Davis coefficient was used, which makes it possible to calculate the ratio of the percentage of pollen of a species in the spec-trum to the percentage of participation of this species in the composition of the phytocenosis. It was found that there is a direct correlation between the composition of the vegetation cover of forest-steppe landscapes and the composition of spore-pollen spectra, which makes it possible to interpret the data of spore-pollen analysis for the reconstruction of paleoclimates and paleolandscapes of the Holocene. The results of malaco-faunal analysis of the Talaya floodplain section are presented, founded in the northwestern part of the Krasnoyarsk basin (56 029´N, 93 045´´E, absolute height ― 213 m) on the floodplain of the right bank of the river,
1 km northeast of the village of Talaya.