The analysis of growth parameters of Russian boreal forests in warming, and its use in carbon budget model

A model and experimental study of the influence of warming on tree growth in Russian forests was carried out. Data on parameters of large-scale carbon cycle models, characterizing the temperature response, are discussed. Pine (Pinus sibirica) and fir (Abies) radial growth in cold and warm years was measured in the Baikal region. It was obtained that typical values of growth rate increase in warming in middle and north Siberian taiga are equal to 12–15% ° C−1, that is 3–4 times more than in south taiga. is a coincidence of these values with our estimations of changes in photosynthetically active radiation during the vegetation period, which can increase by 15, 12.5 and 6.5% in north, middle and south taiga under 1° C warming. mic model was used for estimation of climate-induced changes in carbon balances of different forest zones in Russia. The calculations were carried out by using three variants of growth parameters (medium variant was based on results of measurements). Changes in the parameters induce very significant changes in additional CO2 uptake caused by climate factors. According to our medium model estimation, this uptake is currently equal to 120 · 1012 g C yr−1 and it has the tendency to increase in the future.