抄録
1. A survey was made in 1966 in order to investigate the relationship between sulfur content in leaves of several species of trees and sulfur dioxide concentration in the atmosphere in Osaka region.
2. Leaves of cherry, ginkgo, viburnum, camphor tree and Japanese black pine were sampled for determination of sulfur content at seven places in Osaka city and five places in suburban area in May and September.
3. Sulfur was accumulated in leaves as the season advanced, and the accumulation was apparently higher in Osaka city (Polluted area) than in suburban area (Iess polluted, clean area).
4. With each species, the average of sulfur content in leaves sampled in Osaka city was higher than that in the suburbs.
5. Heavily polluted areas in Osaka city showed considerably high content of sulfur in leaves, for instance in the case of ginkgo above 1.5 per cent in September, while clean suburban area like Kawachi-Nagano city showed much lower value.
6. From these results, sulfur content in leaves of trees seems to be closely related to sulfur dioxide concentration in the atmosphere. It may be desirable to keep strict and continuous watch over harmful effects of air pollution on vegetetion in polluted area like Osaka city.
