STUDY OF THE RADIAL GROWTH DYNAMICS OF THE ASPEN (POPULUS TREMULA L.) AT THE NORTH BORDER OF FOREST-STEPPE ZONE OF THE EUROPEAN PART OF RUSSIA (MORDOVIAN RESERVE)
The article presents the results of studying the dynamics of radial growth of aspen trees in arid conditions on the northern border of the forest-steppe zone of the European part of Russia in the Mordovian State Nature Reserve named after P.G. Smidovich. As has been establish the formation of annual rings has a cyclicity about 11 years, which coincides with the cycle of solar activity. However, the formation of abnormally narrow annual rings can occur outside of this cycle, non periodically. The great above average monthly temperatures of the summer months have a negative effect on the formation of the annual ring next year. Also, the combination of increased precipitation in May with reduced precipitation in June in the year of the formation of the annual ring leads to the formation of extremely narrow annual rings too. The years with increased precipitation in June are favorable for growth.
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