Statistical dependences of the climate impact on the radial growth of spruce trees in a network of six dendrochronological plots in spruce forests in different forest subzones of the Pechora River basin are described. A generalized growth ring chronology obtained for each plot for a period of 127-174 years reflects the local tree-growth features. A group of generalized chronologies with similar parameters, including data on subtundra and north taiga spruce forests, has been identified by cluster analysis. The spruce chronology in more productive middle taiga spruce forests is isolated from the cluster. The width of spruce annual rings within the cluster reflects a positive signal of the air temperature in June and a negative signal of thermal conditions of the preceding growing season. At the end of the growing season, precipitation exerts a positive effect on the diameter growth of spruce trunks. There is a reliable negative relationship between the radial growth of spruce and the air temperature in middle taiga spruce forests in May against the background of weak unstable climatic signals. The use of correlation functions with sliding 15-day series of climatic variables enables us to clarify the time range of the influence of changes in the air temperature and precipitation during the growing season on the width of spruce growth rings. The signal/climate correlations in tree-ring chronologies of spruce change with climatic conditions.
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