The results of identification and dating of frost, false, and light rings in the wood of living and dead Siberian juniper plants growing at the upper forest boundary in the Polar Urals were used to determine the incidence of these structures over the past 630 years. Based on the data of instrumental observations on daily air temperature, the dates and rates of temperature decrease in the years of pathological tree ring formation were analyzed. The recurrence and intensity of extreme temperature drops during the growing seasons of the past six centuries were reconstructed. The severest frosts occurred in the summer seasons of 1601, 1783, 1857, 1882, and 1968.
Russian Journal of Ecology – Springer Journals
Published: Nov 21, 2007
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