Radial Growth of Woody Plants in Extrazonal and Anthropogenic Landscapes of the Dry Steppe of the Western Siberian Plain
2022
Rygalova, N. V. | Bykov, N. I. | Shigimaga, A. A.
The paper presents a dendroclimatic analysis of tree-ring chronologies of conifers (Pinus sylvestris L., Larix sibirica Ledeb.) and deciduous (Betula pendula Roth., Populus balsamifera L.) tree species growing in natural, extrazonal landscapes of pine forest belts (ribbon forest) and natural–anthropogenic landscapes of shelter belts in the dry-steppe subzone of the south of western Siberia. The maximum annual growth was noted in poplars, and the minimum was noted in larches. The radial-growth tree series in shelter belt forests are characterized by the highest climatic sensitivity (the maximum values are noted for birch). The similarity of tree-ring series of birch and larch, which are most susceptible to water stress in dry steppe conditions, was noted. The significance of hydrothermal conditions in August–September of the previous year, as well as in May (for conifers) and mainly June (for deciduous) of the current year, has been established. A positive, statistically significant relationship was noted with precipitation, and an indicator of the area’s moisture content (with the Selyaninov hydrothermal coefficient) was associated with a negative temperature. For the chronologies of pine in natural ribbon forests, the contribution of the first component determines 80.6% of the variability of the series, which is greater than that for the chronologies of shelter belts. This indicates that there is a mixed, natural–anthropogenic signal in the annual tree rings in artificial forest plantations.
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