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CLIMATIC FACTOR IN LONG-TERM DEVELOPMENT OF FOREST ECOSYSTEMS

Prof. Dr. Fedor Lisetskii, Assoc. Prof. PhD. Marina Polshina, Assoc. Prof. PhD. Vitalii Pichura, PhD. Olga Marinina

Abstract

Rhythmic climate changes determine the necessity to refer to long time series to detect low-frequency vibrations of climatic parameters and their influence on the growth processes in ecosystems. Dendrochronological research of pubescent oak (Quercus pubescens Willd) in forest communities of the foothill forest-steppe (250-350 m a.s.l.) and core samples of buried wood in comparison with modern and reconstructed climatic conditions was carried out. The purpose of work was to develop regional tree-ring chronologies for modern and ancient periods, to establish the connection of radial growth (including indices related to early and late wood) with climatic indicators and reconstruction of ancient climate based on dendrochronological data using new methods of time series processing. Radial growths of fossil oak wood from mound of ancient times which were used to build 40 years long tree-ring chronology were compared with the growths of core samples of modern oak trees of the nearby forests (12 sites). Using basic meteorological heat and moisture data (1887пїЅ2016) as well as the results of their conversion into energy equivalents sustainable bioclimatic periods were established, and using mathematical model chrono-organization of regional climatic system was defined. Statistical analysis of the growth indices (total, those of early and late wood) detected no significant differences in the average growths as related to ancient and modern times. Using a complex of statistical methods climatic parameters reconstructions and chrono-organizations of half-century changes in forest site in ancient times were performed.

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DOI resolver: doi.org/10.5593/sgem2017/32/s14.099

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