Journal
CONTEMPORARY PROBLEMS OF ECOLOGY
Volume 8, Issue 4, Pages 423-430Publisher
MAIK NAUKA/INTERPERIODICA/SPRINGER
DOI: 10.1134/S1995425515040137
Keywords
alpine forest-tundra; Larix sibirica; Pinus sibirica; Abies sibirica; elfin forms; climate effect on growth rate
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Funding
- Russian Scientific Foundation [14-24-00 112]
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In recent decades there has been an increase in the radial growth of Larix sibirica Ledeb., Pinus sibirica Du Tour, and Abies sibirica in the Kuznetsk Alatau alpine forest-tundra ecotone. Larch growth correlates positively with summer temperatures; cedar and fir growth is determined by temperature, precipitation, and sunshine duration. It is shown that the current growth of maturing larch trees is about 55% higher than that of a similar age group observed 200 years ago. The rate of larch advancement along the height gradient is estimated at 1 m/10 years. A periodical limitation of the radial growth in fir by winter and summer temperatures is found; the strongest correlation is revealed with summer temperatures (r = 0.9). The growth rate of all conifers correlates highly with the concentration of CO2 in the atmosphere (r = 0.42-0.84). Increased winter temperatures induce the transformation of the elfin forms in larch and cedar (the early 1970s) and later fir (the early 1980s) into vertical forms.
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