Climatic Signal in Tree-Ring Chronologies of Larch on the Western Macroslope of the Sub-Polar Urals

Abstract

The study is directed on revealing of climatic regulation of fluctuation of tree-ring chronology of larch growing on the western macroslope of the Sub-Polar Urals. Studying tree-ring chronology with use of the standard dendroclimatology approaches has allowed to fi nd out reaction of a larch to dynamics of climate. High synchronism of radial growth of larches from different habitats on the upper timberline testifies to similarity of the factors infl uencing growth of trees. The analysis of dendrochronology material has shown that long-term variability of growth indexes is limited by lack of heat during vegetation. Precipitations make weak impact on variability of tree-ring widths of studied trees. The climatic signal in tree-ring chronology on investigated sites is mainly caused by temperature fluctuations in June-July and amplifi es in the second decade of June that reflects local variability of the climate within the western macroslope of the Sub-Polar Urals. Regional climate changes for last two centuries are found by means of reconstruction of summer temperature fl uctuation. The cold snap periods were observed in the beginning of the 19th century and in the end of the 19th – the beginning of the 20th century, and the periods of warming were observed in the middle of the 19th century and from 1920 till our days.