RADIAL GROWTH OF WOODY PLANTS IN EXTRAZONAL AND ANTHROPOGENIC LANDSCAPES OF THE DRY STEPPE OF THE WEST SIBERIAN PLAIN
The article presents dendroclimatic analysis of tree-ring chronologies of coniferous ( Pinus sylvestris L., Larix sibirica Ledeb.) and deciduous ( Betula pendula Roth., Populus balsamifera L.) tree species growing in natural extrazonal landscapes of pine belt forests and natural-anthropogenic landscapes of shelterbelt forests in the dry steppe subzone of southern Western Siberia. The maximum annual growth was recorded for poplar, the minimum - for larch. The greatest climatic sensitivity is characterized by rows of radial growth of trees in shelterbelt forests (maximum values were recorded for birch). The similarity of tree-ring rows of birch and larch, which are most susceptible to water stress under dry steppe conditions, was noted. The significance of hydrothermal conditions of August-September of the previous year, as well as May (for conifers) and, mainly, June (for deciduous species) of the current year was established. Positive statistically significant relationship was noted with precipitation and moisture index of the territory (Selyaninov's hydrothermal coefficient), with temperature - negative. For pine chronologies of natural pine belt forests, the contribution of the first component determines 80.6% of the variability of the series, which is greater than for the chronologies of shelterbelt forests. This indicates a mixed natural-anthropogenic signal in the annual rings of trees of cultivated forest plantations.