|| 要旨トップ | 目次 |||日本生態学会第59回全国大会 (2012年3月，大津) 講演要旨
一般講演（ポスター発表） P3-282A (Poster presentation)
Trans-boundary air pollution in East Asia is a serious problem, and several studies indicated sulfate (SO42-) have been transported from Asian continent to the areas along the Japan Sea (JS). In this study, the amounts of SO42- and stable isotope ratio of sulfur (δ34S) in 35 forest soils (25 sites from the areas along JS and control 10 sites from inland areas) were measured to know distributions and accumulation of SO42-, and to discuss its source. SO42- in soil sample was extracted with 500ppmP Ca(H2PO4)2 solutions and the concentrations were determined by IC. δ34S was analyzed by MS using the δ-notation with respect to the SO2-based V-CDT standard.
Mean of the amount of SO42- as weighted average with the depth of soil from the areas along JS was 7.4mmol kg-1, which was significantly higher than that of inland areas (3.2mmol kg-1). The values of δ34S of the areas along JS ranged from 8.6 to 17.3‰ (mean: 12.9‰). Recalculated δ34S value of non-sea salt SO42- after the elimination of sea salt contribution in these areas (annual mean 40%; MOE, 2009) was about 8.0‰, and it approximated the δ34S values of the coal used in China (7.8±11.0‰; Maruyama et al., 2000). While δ34S values of inland areas ranged from 2.51 to 7.16‰. The sources of these lighter values were probably from the mixing of SO42- from oil used in Japan and volcanic activities.