Changes in the photosynthetic activity of Sorbus gorodkovii Pojark. in the railway impact zone

The photosynthetic pigments content in the leaves and the state of Sorbus gorodkovii and on the railway stations areas in the cities of the Murmansk region were studied. It was revealed that the least weakened specimens are found in the city of Polyarnye Zori. The largest share of strongly weakened plants was noted in Apatity and Olenegorsk. Dead wood was found in Murmansk, Olenegorsk and Kandalaksha. The content of photosynthetic pigments in the assimilating organs of Sorbus gorodkovii in all studied habitats, except for Apatity and Olenegorsk, is comparable to the background. A change in the ratio of pigments in the direction of an increase in chlorophyll a and a decrease in the proportion of chlorophyll b and carotenoids was found, which was not associated with the impact of railway transport.