Home – Home – Jornals – Geography and Natural Resources 2022 number 4

Analysis of data on the density of annual rings of conifers for the periods 1979-1993 and 1979-2006 allows us to identify patterns in the response of trees, taking into account the processes of abnormal decrease and natural recovery of total ozone content. Reconstructions of changes in total ozone content over the past 300 years along the Ural meridian according to satellite monitoring of total ozone content TEMIS (Tropospheric Emission Monitoring Internet Service project) and stem wood responses observed in data on the maximum density of annual rings of pine, spruce and larch were performed on the basis of methods of dendrochronological and spectral singular analysis, which made it possible to compare the current and past state of stratospheric ozone fields. Although changes in stratospheric ozone can play the role of a factor significantly limiting the annual growth of wood, such an approach to estimates works only in conditions of overlapping responses of trees under UV-B effects in the spectral range of 280-315 nm on stress responses from other climatic factors. Based on the results of a numerical modeling for three latitude ranges, models of maximum annual density were calculated in terms of changes in total ozone content and reconstructions of their past changes were given. The aridity of the climate and its cyclicity increase the stress effect of the ozonosphere on vegetation associated with an increase in UV-B radiation, and allow us to differentiate the responses of trees according to stressors by statistical methods. Reconstructions of total ozone content from April to September for the Ural meridian show that the level of total ozone content has not yet reached the previous historical values.