人為源空中塵の屋久杉ヘの影響

概要

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The purpose of present paper is to point out that the pollutants, which are caused by human work such as exhaust fumes from car and combustion of coal, emitted from their source spread as they are born by air current and have an effect on chemical backgroud of natural environment in global scale by secular change of lead isotopic ratio and heavy metals. The analyzed sample of Cryptomeria Japonica at the age of 450 years was collected from Yaku-shima island which locate in the western ridge of the Pacific Ocean. All processes in chemical analysis were performed under the class 100 circumstances of NASA standard at worst. As a result, the concentration of the heavy metal such as Ag, Cu, Cd, Ni, Tl from heartwood to bark increased equal to or more than 10 times of that in heartwood. Moreover, as for the change of lead isotopic ratio, it became clear that the ration in heartwood approximately equaled to that of basement rocks of Yakushima island and that in the sapwood and bark approached to that of anthopogenic aero sol.
室蘭工業大学の論文
2000-11-30