ECOLOGICAL AND CENOTIC FEATURES OF THE FORMATION OF FOREST ECOSYSTEMS IN THE MIDDLE REACHES OF THE KOTUY RIVER IN THE CONTEXT OF GLOBAL CLIMATE CHANGE
V. L. Koshkarova, A. D. Koshkarov
Krasnoyarsk Science Centre of the Siberian Branch of Russian Academy of Science, V. N. Sukachev Institute of Forest, Russian Academy of Sciences, Siberian Branch, Krasnoyarsk, Russian Federation
Keywords: vegetation reconstruction, plant macroremains, climate, Holocene, geochronology, Northern Evenkia
Abstract
The article highlights the results of a paleobotanical study of peat deposits in the basin of the middle reaches of the river Kotuy (Northern Evenkia). The macro-remains of fossil plants became the basic material for the study. Based on the change in the species composition of fossil objects and radiocarbon dating by 14C, the dynamics of the phytocenotic structure of changes in the structure of forest formations from 6000 years ago to the present is reconstructed. A quantitative assessment of their climatic conditionality is given. At the beginning of the period under consideration, because of warming and increasing humidity, the biodiversity of the vegetation cover increases and the formation of mixed forests (Siberian spruce ( Picea obovata Ledeb.), Scots pine ( Pinus sylvestris L.)) is formed. With an increase in the continentality of the climate and cooling, biodiversity decreases, and the sparse larch (Gmelin larch ( Larix gmelinii (Rupr.) Rupr.))becomes the dominant formation. The dynamics of the boundaries of the ranges of Siberian larch ( Larix sibirica Ledeb.), Gmelin larch, Siberian dwarf pine ( Pinus pumila (Pall.) Regel.) at the boundary of the climatic optimum and in the late Holocene was established.
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