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Russian Geology and Geophysics

2006 year, number 8

RECONSTRUCTION OF THE MIDDLE-LATE HOLOCENE NATURAL CLIMATIC CONDITIONS IN THE OB' REGION NEAR NOVOSIBIRSK ( using palynological data from Lake Beloe sediments )

I.V. Khazina
Institute of Petroleum Geology and Geophysics, Siberian Branch of the RAS,
3 prosp. Akad. Koptyuga, Novosibirsk, 630090, Russia
Keywords: Paleovegetation, paleoclimate, palynology, Holocene, Lake Beloe, Novosibirsk Region
Pages: 964-971

Abstract

Palynological studies were given to the Holocene lacustrine-palustrine sediments of Lake Beloe (Novosibirsk Region). On the basis of cores obtained from two boreholes, spore-and-pollen diagrams were compiled and four palynozones were recognized to characterize the vegetation for the last 5000 years. It has been established that the lake has been surrounded by birch forests for this period. The pollen of Pinus sylvestris L. is a component brought from other zones and reflects a remote flora. The local vegetation was subject to changes. In the early sub-Boreal period the climate was wet and somewhat warmer than it is now. Diverse hydrophytes, sedge, and reed were quite abundant around and within the water body. In the second half of the sub-Boreal period, the lake was surrounded by swamped areas, where ferns, horsetails, and palustrine Thelipteris grew. Sapropels began to form at around the onset of the sub-Atlantic period. The dwarf birch dispersed on the shores of the lake. The amount and diversity of hydrophytes were drastically diminished. Most likely, some cooling took place. Since the second half of the sub-Atlantic period, the vegetation of Lake Beloe has acquired the modern character. The lake is surrounded with reeds, canes, and sedge communities. Pondweed, duckweed, Myriophyllum, and other aquatic plants grow in the water body.