Scientific Proceedings of Vanadzor State University Natural and Exact Sciences (ISSN 2738-2923)
2023 vol 2
Peculiarities of Respiration and Photosynthesis Processes of Plants Belonging to the Genera Catalpa L. and Paulownia L. Used in Landscaping of the City of Vanadzor
Key words: global climate change, biodiversity, greening, introduced species
The species composition of biodiversity is negatively affected by global climate change.
As a result of global warming, changes in the physiological processes of many plant species occur. Due to global warming, it has been recorded that many introduced plant species are well adaptable in the wild and suitable for cultivation. Presumably plants, belonging to the genera Catalpa L. and Paulownia L. are such species of plants. Given the projections of global warming, the selection of plant species for urban greening should prioritize not only their fast growth rate and adaptability but also an examination of their fundamental physiological processes, specifically focusing on photosynthesis and respiration, within the specific urban environment. Based on the research conducted in the city of Vanadzor in June and August 2023, it has been determined that plants from the genera Catalpa L. and Paulownia L. are among the introduced species utilized for the city’s landscaping. Previously, plant species belonging to these genera were not used in landscaping. In all likelihood, the climatic conditions of Vanadzor were unfavorable for growing these plants. Due to the increase in average annual temperature, plants belonging to these two genera were discovered in the green spaces of the city of Vanadzor. In the trees belonging to the genus Catalpa L. in the city of Vanadzor, there was a recorded increase in photosynthetic activity by 1.025 times at the end of the growing season. This is significant because the utilization of this plant type for city greening can help reduce CO2 concentration in the atmosphere. On the other hand, the examination of the basic physiological processes in trees belonging to the genus Paulownia L. indicates a high rate of respiration intensity, resulting in the release of CO2 gas into the atmosphere in these plant species. These findings emphasize the need for a scientific approach to landscaping, taking into account the projected climate changes in the city of Vanadzor.