A method for facilitating the use of algae growing on tree trunks as bioindicators of air quality |
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Authors: | Otto Hänninen Juhani Ruuskanen Jari Oksanen |
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Institution: | (1) Environmental Consulting Ltd., Savilahdentie 6, 70210 Kuopio, Finland;(2) University of Kuopio, P.O. Box 1627, 70211 Kuopio, Finland |
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Abstract: | The abundance of epiphytic green algae has been observed to correlate strongly with air quality in several studies. In contrast to lichens, the abundance of green algae is difficult to measure accurately by visual observation. A new method based on photography and digital image processing was developed to estimate the chlorophyll content of algae growing on the bark of pine. Calibration data for the method was collected from polluted areas by spectrophotometric analysis of chlorophyll density. |
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