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The goal of the study is to relate features of seasonal radial growth of Pinus sylvestris from the Sredniy island of the Keretsky archipelago (the White Sea, N 66.1724 E 33.3876), to the seasonal weather conditions. The measurement of air temperature and precipitation amount was performed by data loggers and by local weather station mounted in 2014. The ecosystem studied is classified as a dry pine forest with Vaccinium myrtillus and green mosses in the herb layer. The microcores of seasonal radial growth were extracted from 10 selected dominant trees in 2014 every 7 days with 5 cm shift. The cores were microtome sliced to measure count and size of growing cells. Dynamics of tree-ring enlargement permitted to estimate the dates of the seasonal growth stages in 2014: start of the growth was detected in the first decade of June (02.06-05.06), culmination of growth features the second decade of July (13.07-14.07), termination of growth was reached in the late August (16.08-23.08). The growing season lasted 75-80 days. The dates estimated differs from the ones published by another researchers which can be due to the differences in habitats, seasonal weather and methods of computation. Comparison of air temperature featuring the 2014 with long term observations provided by spatially close weather station Umba reveals anomaly high temperature of late May and early June that could have initiated early start of radial growth. The current study illustrates the limiting role of temperature in the beginning of growth, whereas precipitation and water amount available to the trees are the key factors affecting growth in the middle of the season. Data of on-site weather station permitted to show the link between precipitation and jumps of seasonal radial growth.

Xylogenesis of pinus sylvestris l. Growing in the northern island ecosystems