Physiological responses of lichens to factorial fumigations with nitric acid and ozone

Riddell, J.; Padgett, P.E.; Nash, T.H. III

Physiological responses of lichens to factorial fumigations with nitric acid and ozone

2012

Riddell, J. | Padgett, P.E. | Nash, T.H. III

This paper addresses the effects of gaseous nitric acid (HNO₃) and ozone (O₃), two important air pollutants, on six lichen species with different morphological, ecological, and biological characteristics. The treatment chambers were set up in a factorial design consisting of control chambers, chambers fumigated with HNO₃, with O₃, and with HNO₃ and O₃, together. Each species showed a different sensitivity to the fumigations, reflecting the physiological variation among species. Our results clearly indicate that HNO₃ is a strong phytotoxin to many lichens, and that O₃ alone has little effect on the measured parameters. The combined fumigation effects of HNO₃ and O₃ were not significantly different from HNO₃ alone.

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