Monitoring of epiphytes on permanent plot in the vicinity of Bratislava (SW Slovakia)
2000
Pisut, I. | Lisicka, E. (Slovak Academy of Sciences, Bratislava (Slovak Republic). Institute of Botany)
In Bratislava, an important industrial centre, air pollution has significantly increased since 1960. A grove, called Panonsky haj, situated 12 km NE from the city centre and on the border of the air pollution field, was chosen to study epiphytes on permanent plot. The investigations started in 1973, a trunk of Quercus robur was examined. A collapsible wire net of 312 quadrates was used, covering 54,750 square cm. Observations were carried out until 1989. Steady deterioration of the epiphytes was registered, with a decrease number of species at individual quadrates and an increase of number of quadrates with only species present. Nevertheless, symptoms of certain restoration in the last years were noted, due to the decrease of air pollutants concentration. Parmelia tiliacea disappeared totally, Parmelia glablatura and Evernia prunastri distinctly decreased too. Pertusaria albescens showed no changes in its frequency. That of Parmelia sulcata (represented only by young thalli) slightly increased. The same was true about Pleurococcus vulgaris, whereas the frequency of Hypnum cupressiforme increased significantly. During the period of 16 years the plot was not permanently colonised by any new species
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