[A-HW29_2PM2] JapanFlux: Role of terrestrial ecosystems in water/material cycles

[AHW29-10] Withering of Japanese oak by sulfuric acid of an air pollutant. and prevention from withering by charcoal

*Teiko OMORI¹, Yuzo YOSHIIKE¹, Shinobu OKAMURA¹, Masato IWASAKI¹ (1.The Faculty of Science Toho University )

Keywords:air pollutant,charcoal,withering of pine,withering of Japanese oa,tannin,phosphoric acid

The sulfuric acid which generates by the combustion of a fossil fuel is carried by wind and adheres to trees and only water
evaporates and the sulfuric acid concentrates and accumulates.Sulfuric acid is dropped on the root of a tree by rain and it acidi?es
the soil.The metal ingredient in the soil becomes a soluble compound.The eluted metal ion is absorbed by trees and it combines
with phosphoric acid.The trees become shortage of phosphoric acid and decay.If the tannin contained in Japanese oak combines
with metal ion it becomes harmless to insect.Withering of trees originates in acidi?cations of soil.Charcoal can neutralize the
acidi?ed soil.The results of an investigation are explained on the basis of consideration from chemical standpoint.