INFLUENCE OF THE GROWING CONDITIONS OF SIBERIAN CEDAR PINE (PINUS SIBIRICA) ON THE PROCESSES OF PHOTOSYNTHESIS AND TRANSPIRATION
The influence of the growing conditions of Siberian cedar pine (Pinus sibirica) on the processes of photosynthesis and transpiration was investigated. A direct relationship was revealed between a decrease in light intensity and a decrease in the rate of photosynthesis, and an inverse relationship between a decrease in light intensity and the rate of transpiration in samples growing in phytotron. A parabolic relationship between the intensity of light and the rate of photosynthesis and transpiration was revealed in samples growing in natural conditions. When studying the effect of the CO<sub>2</sub> content in the air on the photosynthesis rate, a direct relationship is observed in all samples: with a decrease in the CO<sub>2</sub> content in the air, a decrease in the photosynthesis rate is observed, with an increase in the CO<sub>2</sub> content, an increase in the photosynthesis rate is observed. The study of the change in the transpiration rate from the CO<sub>2</sub> content did not reveal a clear dependence.