Home – Home – Jornals – Contemporary Problems of Ecology 2005 number 4

For the first time wood ring chronology data have been obtained in habitats most typical for the Olkhon region for the study of the radial increment of pine and larch. Statistical analysis of the chronologies obtained has demonstrated their high sensitivity to the effects of climatic factors and in the first place to atmospheric humidity. The fraction of the accounted-for dispersion by the first three components amounts to 80 %. A 30-20, 7-6, 4-3 year cyclicity and 2-year quasicyclicity of the radial increment of pine and larch reflecting preferentially the time course of the atmospheric humidification of the given region has been established. For the first time, some unknown dates of large gradations of the main insect pests and large-scale regional and local forest fires have been determined. By the pattern of increment of these coniferous species, ecological heterogeneity of the region under study was established