Subrecent pollen assemblages in alluvial deposits of the Don and Kuban rivers and their significance for palaeogeographic reconstructions
https://doi.org/10.55959/MSU0579-9414.5.79.1.4
Abstract
The paper presents the results of studying modern alluvial deposits of the Don and Kuban rivers by the pollen analysis method. The study was carried out to clarify methodological issue, including the movement of pollen and spores by flowing waters. The obtained data show that pollen assemblages of river sediments formed in the process of pollen mixing by water and air characterize the composition of the regional vegetation cover rather than local near-river plant groups. According to the results for the subrecent sediments of the Don River the transfer of pollen grains and spores by water was insignificant, which can be clearly seen at the border of the forest-steppe and steppe zones. Pollen assemblages of the forest-steppe zone contain 50% of tree species pollen, while in the steppe zone, including its northern part, tree species make up less than 30–35%. Sporadic forest elements such as Picea pollen, Lycopodium species spores and Sphagnum mosses in alluvial deposits of the steppe section of the Don River, as well as in the subrecent sediments of the Sea of Azov, could be neglected in the palaeoreconstructions. The composition of subrecent pollen assemblages of the Kuban River sediments is less variable from the middle course to the mouth with rather stable ratio of components. Pollen of the Caucasian flora elements (Fagus orientalis, Carpinus caucasica) is poorly dispersed by water from high and midmountain landscapes of the upper reaches of the river. The comparison of pollen assemblages from alluvial and marine (the Sea of Azov) sediments have shown that the distortion of fossil assemblages’ composition due to material input by water is minimal.
Supporting agencies: The work was carried out under the state task of the SSC RAS nо. 122011900166-9.
About the Author
K. V. Dyuzhova
Federal Research Centre “Southern Scientific Centre” of the Russian Academy of Sciences
Russian Federation
Russian Federation
Senior Scientific Researcher, Ph.D. in Geography,
Department of Oceanology and Geography
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Review
For citations:
Dyuzhova K.V. Subrecent pollen assemblages in alluvial deposits of the Don and Kuban rivers and their significance for palaeogeographic reconstructions. Lomonosov Geography Journal. 2024;(1):48-60. (In Russ.) https://doi.org/10.55959/MSU0579-9414.5.79.1.4
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