Landesweite immissionsbezogene Flechtenkartierung in Bayern

In 1996 within a country-wide research project, the epiphytic lichen vegetation throughout Bavaria was mapped according to Guideline VDI 3799, Part I (1995). The data providing information about air quality was collected in 190 sites. Most of the sites demonstrated little to moderate pollution, while both very high and very low levels of air pollution could be found locally. The methods outlined in Guideline VDI 3799 were slightly modified and adapted to the situation in Bavaria. Comparison of the lichen vegetation on different species of trees showed that a rigid classification of tree species as proposed in the guideline is not necessary in Bavaria. The use of several species of trees per site has proven to be favourable. The influence of the natural heterogeneity of the air-quality index in the investigated area was examined. Here, the geology turned out not to be a crucial factor. With respect to climate, it is especially the alpine region with its high levels of precipitation that stands out against the other parts of Bavaria. The results from that area may not be freely compared to those from the remaining sites. It could be shown that the Guideline VDI 3799 is applicable for large-area lichen mapping in Bavaria.