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How trees resists the stress of city environment
ŠINDELÁŘOVÁ, Lenka
The aim of this diploma thesis was to find out the seasonal changes of the air pollution tolerance index (APTI) in London planetree (Platanus acerifolia) and small-leaved lime tree (Tilia cordata), which grow in Jiráskovonábřeží in České Budějovice near the busy urban roads. The research was conducted in August, 2015. The complete results of this research were summarized into a teaching presentation for pupils at primary schools, which shall show them the issues of urban stress for these two tree species, which are very often planted in cities. The APTI index consists of four parameters, which were needed to be found out for the APTI index could be established. These parameters for the APTI are: the content of chlorophylls in a leaf, the content of the ascorbic acid in a leaf, the relative water content in a leaf and the pH of the extract from a leaf. By the discovering ofthe values of these parameters, the APTI was counted and thanks to this APTI it was easier to determine, which of these two tree species is less or more stressed by air pollution on the particular location. Further, the fluorescence of chlorophyll, which is -next to the APTI index- another indicator of effect of stress on the physiological processes in a plant and measured fluorescence values were compared with values from the previous measuring in 2013. The results were statistically evaluated and processed into the tables and graphs. According to the results of the APTI index, the small-leaved lime tree has proved as more sensitive to air pollution in Jiráskovo nábřeží, the London planetree was more resilient from this point of view. By the comparison of the results of chlorophyll content and fluorescence from 2013 and 2015, it was found out that the year 2015 has proved as less favourable for both species.
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