ELEMENT CONTENT OF LICHENS, BARKS AND NEE DLES FROM FORMERLY DIFFERENT SO2 POLLUTED SITES

The material was selected from sites which have a different distance t o an uptil 1987 active SO2 emitter. With X-ray fluorescencespectroscop y (EDXRFA) the lichens thriving on different wood species, bark and ne edles from different tree species were analysed. It could be shown tha t the content of some elements in lichens, barks and needles is still connected with the distance of the site to the former emitter. This se ems to be an indirect evidence of the formerly different intensity of SO2 pollution of the sites depending probably on the pH-value of the u pper soil and its influence onto the internal fluxes of the ecosysteme .