Abstract:
:This paper describes the epiphytic lichen vegetation on maple trees along an 1.1-km avenue leading from the outer suburbs of Freiburg toward the city center. A special aim of this investigation was to examine the variation in the coverage by lichens altogether and by each lichen species as a function of increasing distance from the city. It required very accurate quantitative recording methods, including the "method of hits" and other statistical techniques. The coverage both of total trunk surface and of sectors facing different directions increases with increasing distance from the city. The distribution pattern of SO2 pollution in winter, especially under certain weather conditions, e.g., during winter highs with very high SO2 concentrations, implies a negative correlation between the amount of SO2 pollution and the total percentage of lichen cover. An influence of factors specific to urban climate and traffic emissions is neglegible. The stress caused by increasing immission from outer suburbs towards the city is also indicated by the decline in coverage by the lichens of foliaceous growth form, the increase in coverage by green algae, and the lichens of crustaceous growth form, especially by the resistant Lecanora conizaeoides. The degree of lichen cover changes with exposure. The differences between the four exposure zones may be caused by climatic differences.
journal_name
Oecologiajournal_title
Oecologiaauthors
Wirth V,Brinckmann Bdoi
10.1007/BF00346838subject
Has Abstractpub_date
1977-03-01 00:00:00pages
87-101issue
1eissn
0029-8549issn
1432-1939pii
10.1007/BF00346838journal_volume
28pub_type
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