Abstract
Within our research, the air quality of 62 forest ecosystems from Republic ofMoldova was assessed, taking into consideration the lichens indicator speciesspecific diversity, abundance and toxitolerance. It was established that theMoldavian forest ecosystems do not contain reserves concerning critical loads forSO2 pollution, the annual average for the vegetation season for dendrologicalspecies being 0,02 mg/m3 air, and for communities of lichens and cyanobacteria,organisms sensitive to pollution, represented only 0,01 mg/m3. Lichen indicationdemonstrated that the current level of pollution is between 0,05 and 0,5 mg/m3 SO2air, thus long-term harmful effects are manifested in all 62 studied forestecosystems and the ecosystems from the eco-tone zone. We believe that for theRepublic of Moldova lichen, indicator species can provide a scale of 6 levels: 5levels characterized by species with different toxitolerance degree and the last stepbeing an area in which lichens are completely missing, thus the most polluted area.Within the Republic of Moldova territory, there were reported 3 forest ecosystemsin which the air is evaluated as clean air, 11- low polluted air, 31- moderatepolluted air, 12- polluted air, 3- high polluted air and those with critical polluted airwas missing.
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