Reaction of Coniferous Trees of Kuznetsky Alatau Alpine Tundra Ecotone on Climate Change
I. A. PETROV1, V. I. KHARUK1,2, M. L. DVINSKAYA1, S. T. IM1,2
1V. N. Sukachev Institute of Forest SB RAS, 660036, Krasnoyarsk, Akademgorodok, 50/28
2Siberian Federal University, 660041, Krasnoyarsk, Svobodny ave., 79
Keywords: alpine forest-tundra ecotone, Larix sibirica, Pinus sibirica, Abies sibirica, elfin wood forms, affect of climate on the growth rate
Abstract
In recent decades, there has been an increase in radial growth of Larix sibirica Ledeb., Pinus sibirica Du Tour and Abies sibirica Ledeb., which grow in Kuznetsky Alatau alpine tundra ecotone. Larch growth positively correlated with summer temperatures; cedar and fir growth was determined by temperature, precipitation and sunshine duration. It was shown that the current growth of maturing larch trees on average was 55 % higher than that of a similar age group 200 years ago. The rate of larch advancement along the height gradient was estimated as 1m / 10 years. Periodical limitation of fir radial growth by winter and summer temperatures was noted; the strongest correlation was observed with summer temperatures (r = 0.9). For all conifers there was a high correlation of growth rate with atmospheric CO2 concentration (r = 0.42...0.84). Increased winter temperature induced transformation of elfin forms of larch and cedar (early 1970s) and fir (early 1980s) into vertical forms.
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