Abstract
Dynamics of carbon dioxide exchange in the Common Spruce (Picea abies L.) in relation to environmental factors was monitored during several seasons. Direct linear dependence of photosynthesis rate from the levels of air temperature and illumination was found, and correlation coefficients were 0.860 (p < 0.001) and 0.704 (p < 0.001). It was found that seasonal maximum of net photosynthesis production was attained at temperatures of 23–25°C. A decrease in temperature optimum was associated with reduction of the CO2 assimilation intensity level. The impact of environmental factors on photosynthesis intensity is discussed in terms of the developed model. Using this model, we demonstrated that temperature and illumination dynamics in toto accounts for 82% of changes in photosynthesis rate. It is the air temperature that exerts the strongest influence on the process of photosynthesis. According to our calculations, the net photosynthesis level was three times higher than the level of respiration. This is indicative of a positive carbon dioxide balance in the needles of the Common Spruce.
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Original Russian Text © A.K. Yuzbekov, D.G. Zamolodchikov, 2017, published in Vestnik Moskovskogo Universiteta, Seriya 16: Biologiya, 2017, Vol. 72, No. 2, pp. 106–112.
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Yuzbekov, A.K., Zamolodchikov, D.G. Carbon dioxide exchange in the needles of the common spruce in southern taiga spruce forests. Moscow Univ. Biol.Sci. Bull. 72, 91–96 (2017). https://doi.org/10.3103/S0096392517020055
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DOI: https://doi.org/10.3103/S0096392517020055