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 (414Kb)
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12,898,000 Yen (FY1995 12,898,000 Yen)
In the 1980's, the effect of acidic rain on plants became a topic of increasing concern. Some authors have reported the effects of simulated acid rain on lichens and bryophytes. However, the relation between tolerance to acid and the field distribution of examined species has not been discussed well. The tolerances of some epiphytic bryophytes to simulated acid rain, activity of superoxide dismutase(SOD), and the relation to their respective distribution patterns were studied. Twenty species of bryophytes collected in urban, rural and forested areas were treated by sulfuric and nitric acids and the acid mixture(simulated acid rain) to detect the tolerance of species. The tolerances were judged by the death or new flush of treated shoots. Most of the species could tolerate 1.0m eq/l(pH around 2.6) but died at 10.0 m eq/1. Low concentration of acid solution affect the growth of shoots and rhizoids. SOD activity in increased evidently in the case of acid tolerant species treated with low concentration of sulfuric acid. The tolerance of bark epiphytes seems to be correlated to the nature of the bark. However, the correlation between the distribution pattern and the tolerance to the acidity of simulated rain water is not clear.
Bryophyte, Lichen, Simulated Acid Rain, Superoxide Dismutase