Features of Annual Pinus sylvsetris L. Shoot Increment in an Urbanized Environment

The aim of the research has been to study the features of the annual increment of shoots of Scots pine (Pinus sylvestris L.) trees depending on the hydrothermal regime of the air environment in the conditions of the city of Omsk. The subject of the study has been the analysis of shoot growth during the growing season. The nature of the hydrothermal regime is considered by constructing climatic diagrams according to Gossen–Walter based on data from the agrometeorological bulletins of the Omsk hydrometeorological centre from 1960 to the present day for May. The features of the dynamics of annual shoot increment in Scots pine trees have been studied at 3 different sites in the city of Omsk. The characteristics of the considered areas of pine crops have been presented, and the patterns of annual increment of shoots of model trees have been described. An analysis of the synchronicity of annual increment of model trees according to S.G. Shiyatov has been carried out. As a result of the correlation analysis using the moving average method, a moderate relationship has been found between the annual increment and the air temperature for May–June in all areas; a moderate relationship with the amount of precipitation for May and May–June has been obtained only for one area. According to climatic diagrams, over the past 30 years, the frequency of wet periods in May has increased, while their duration has decreased. In addition, very low correlation coefficients have been established between the annual increment of pine trees and temperatures and precipitation over the studied months of the growing season, which confirms the absence of linear relationship between them. The research materials can be useful in organizing work on the care of Scots pine plantations and developing theoretical foundations for the production of pine crops in urban conditions.