CARBON DIOXIDE EXCHANGE IN THE NEEDLES OF THE COMMON SPRUCE OF SOUTHERN TAIGA SPRUCE FORESTS
Abstract
The dynamics of carbon dioxide exchange in the common spruce (Picea abies L.) in relation to environmental factors was monitored for several seasons. A direct linear dependence of photosynthesis intensity on the levels of air temperature and illumination was established (the correlation coefficient was 0,860 (p <0.001) and 0,704 (p <0.001)). It was revealed that the seasonal maximum of net photosynthesis production was attained at temperatures of 23–25°C. A decrease in temperature optimum was associated with a reduced level of CO2 assimilation intensity. The impact of environmental factors on photosynthesis intensity was considered in terms of a model developed by us. Using the model, we demonstrated that the temperature and illumination dynamics in toto accounts for 82% of changes in photosynthesis intensity. 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 respiration level. This is indicative of a positive carbon dioxide balance in the needles of the common spruce.
About the Authors
A. K. Yuzbekov
Lomonosov Moscow State University
Russian Federation
Russian Federation
Department of General Ecology, School of Biology
Leninskie Gory, 1-12, Moscow, 119234, Russia
D. G. Zamolodchikov
Lomonosov Moscow State University
Russian Federation
Russian Federation
Department of General Ecology, School of Biology
Leninskie Gory, 1-12, Moscow, 119234, Russia
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For citations:
Yuzbekov A.K., Zamolodchikov D.G. CARBON DIOXIDE EXCHANGE IN THE NEEDLES OF THE COMMON SPRUCE OF SOUTHERN TAIGA SPRUCE FORESTS. Vestnik Moskovskogo universiteta. Seriya 16. Biologiya. 2017;72(2):106-112. (In Russ.)
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