Dendrochronological research of pine growth forms in the territory of the Pinezhskiy reserve security zone

Dendrochronological analysis is a traditional method of assessing the state of forests. When monitoring forest plantations, studies in specially protected natural areas are important. Studies have been carried out to examine the growth of pine forms with different types of apophysis in the shrub and sphagnum pine forests of the Pinezhskiy district of the Arkhangelsk Region. Pine forms with different types of cone seed scales apophysis were distinguished: a “convex” type and a “flat” type. Various forms of pine were recorded in the shrub and sphagnum pine forests. It was established that a convex type pine has larger average values for the height and diameter of the trunk, the height of the living branch rising, and the length and diameter of the crown than a flat form. Significant differences in the morphostructural features of cones - specifically, in the length and weight of the cone, as well as the length and height of apophysis - were found between convex and flat type pines. The average radial growth value of a pine with a flat type of seed scales apophysis is lower than that of a convex type. A convex type pine predominates in terms of radial growth over the entire time series as compared to a flat type. Significant and high correlation links between radial growth (in relative indices) and average annual temperature, growth and the temperature of the beginning of vegetation were revealed.