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Article Skvortsovia ISSN 2309-6497 (Print) ISSN 2309-6500 (Online) Skvortsovia: 6(4): 1-84 (2020) http://skvortsovia.uran.ru/
Cultivated woody plants as indicators of ongoing climate change in St. Petersburg, Russia Abstract In the city of St. Petersburg, in the last three decades a substantial increase has been observed in the mean annual air tem...
Citations
The article studies the accumulation of photosynthetic pigments and the ratio of their forms in the needles of Juniperus communis L. in the mountainous middle taiga dark coniferous forests of the Southern Urals during the winter and summer periods in contrasting conditions of the tundra-clear forest transition zone within the same slope of Dalniy Taganay. The assessment of the morphophysiological state makes it possible to assess the adaptive capabilities of plants, which consist in changing the content and ratio of pigment forms, transformation of the life form, while the accumulation of the pigment composition does not depend on age. Adaptation of the photosynthetic apparatus at the level of the ratio of photosynthetic organs allows this species to maintain growth parameters and gain an advantage in light spruce forest conditions.
The created collections of woody plants made it possible to evaluate the life cycle of forsythia Forsythia ovata Nakai, privet Ligustrum vulgare L., and high ash Fraxinus excelsior L. of the Oleaceae Hoff family. et Link. and their response to changing climatic conditions. Tall ash, common privet froze every year to the level of snow cover. The flower buds of the forsythia froze, and it did not bloom. Due to the increase in the average annual temperature from 1.7 °C to 2.69 °C since 1990, forsythia and privet began to bloom and bear fruit. Introductory populations were created and the most frost-resistant and abundantly flowering individuals were selected. But as a result of abnormal weather conditions and climate cyclicality, all young and old privet plants died in 1998. Common privet plants began to bloom profusely only in 2021 (sowing in 2018). High ash plants fully recovered and reached a height of 10-12 m.
