Abstract
Parameters characterizing the activity of species in altitudinal zonal elements of the flora have been analyzed in the northern Baikal region. The results provide evidence for the weakening status of xerophilic species in the cenoflora of hemiboreal light coniferous forests of the class Rhytidio-Laricetea, which form the lower part of the forest belt bordering the steppe. This fact indicates that climate on the slopes of mountain ridges is becoming more humid. The increase in humidity may be explained by both progressing degradation of permafrost and increasing precipitation. On the other hand, no significant change has been observed in the cenoflora of mountain taiga forests of the class Vaccinio-Piceetea, which form the upper part of the forest belt.
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