The aim of the research was to determine the impact of climatic conditions on the tree−ring
width of Swedish whitebeam Sorbus intermedia (Ehrh.) Pers. growing in the urban conditions in
Szczecin (NW Poland). The samples were taken from 26 trees growing along Rodziewiczówny,
Ejsmonda and Santocka streets (left bank of the Odra river). On the basis of the tree−ring width
measurements and cross−dating, two local chronologies (JS1 – Rodziewiczówny and Ejsmonda
streets, and JS2 – Santocka street) were developed. Later on we indexed them (double detrending,
least squares method and spline function) and subjected to the analysis of correlation and response
functions. Growth−climate dependencies in both Swedish whitebeam communities are different.
For the JS1 chronology the highest value of the multiple regression coefficient was obtained for
air temperature, while for JS2 chronology for insolation and precipitation. For both sequences
dependency on climate is similar in August and December of the previous year of vegetation
and in January, February, April, June and July of the current year. The observed differences are
the result of the impact of various factors related to human activity: traffic volume, soil pollution
(mainly heavy metals and salt), damage to roots, trunks and crowns.