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Correlation between the nitrogen concentration of two epiphytic lichens and the traffic density in an urban area


Correlation between the nitrogen concentration of two epiphytic lichens and the traffic density in an urban area



Environmental Pollution 123(2): 281-290



ISSN/ISBN: 0269-7491

PMID: 12628207

DOI: 10.1016/s0269-7491(02)00367-6

A field experiment was carried out in the urban environment of the Grenoble area using two epiphytic lichens: the nitrophytic Physcia adscendens and the acidiphytic Hypogymnia physodes. Two complementary studies characterized this experiment. Firstly, a sampling of the two lichens in 48 sites randomly located throughout the Grenoble area indicated that roads (size and proximity to sampling sites) influenced the nitrogen concentrations of P. adscendens, but not those of H. physodes. Secondly, to study more accurately the influence of roads, a traffic index was calculated and applied along two transects located perpendicularly to urban motorways. Significant positive correlations were found between this traffic index and the total nitrogen concentration of P. adscendens.

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Accession: 003695630

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