Study of transplanted lichens with the use of physical methods: the case of Xanthoria parietina (L.) Th. Fr.

Resumo

Electron paramagnetic resonance spectroscopy and inductively coupled plasma optical emission spectrometry were used to study the epiphytic lichen Xanthoria parietina (L.) Th. Fr. transplanted to natural and urbanized zones in the Moscow region. The combination of physical and lichenindication methods allowed us to determine periods as well as the magnitude of changes in the biophysical characteristics of the transplanted lichen in different environmental conditions. Electron paramagnetic resonance spectroscopy demonstrated that the number of paramagnetic centers in lichens transplanted to the natural zone did not change in comparison with initial value (2.6 ± 0.4)·10¹⁷ spin/mg) and remained stable after four weeks after transplantation. The number of paramagnetic centers in lichens transplanted to the urbanized zone increased by 1.1·10¹⁷ spin/mg by the end of the third week as compared with its initial value ((2.6 ± 0.4)·10¹⁷ spin/mg). Inductively coupled plasma optical emission spectrometry was used to measure concentration of iron, copper, manganese, magnesium, and zinc. We detected substantial changes in concentration of these elements during first four weeks after transplantation. For instance, concentration of copper in lichens transplanted to the urbanized zone increased from 7.5 ± 2.7 μg/g to 56.4 ± 8.6 μg/g by the end of the third week of the experiment.