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Lead isotope ratios in moss for the assessment of transboundary pollutants in the Yatsugatake Mountains, central Japan

机译：苔藓中的铅同位素比评估日本中部地区Yatsugatake山区跨界污染物

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Transboundary atmospheric pollutants emitted from mainland Asia are transported to Japan and pose a serious threat to mountain ecosystems. Pb isotope ratios (Pb-207/Pb-206 and Pb-208/Pb-206) of the transboundary pollutants are generally higher than those that characterize domestic pollutants in Japan. Hence, this study examined the influence of transboundary pollutants on the Yatsugatake Mountains by detecting the higher Pb isotope ratios in moss. Based on this examination, we discussed the usefulness of Pb isotope ratios in moss for monitoring transboundary pollutants. As northwesterly-westerly winds transport these pollutants to Japan, we hypothesized that the Pb isotope ratios in moss would be higher on the western slopes of the mountains than on the eastern slopes. Furthermore, this difference would be more apparent at higher elevations because of the smaller influence of domestic Pb pollutants. Contrary to these hypotheses, all the Pb isotope ratios in moss were within the ranges of domestic Pb pollutants across the study area, indicating that the influence of transboundary Pb pollutants on moss was small. Notably, these responses of moss to transboundary Pb pollutants differ from those to transboundary nitrogen pollutants. These results imply that the sensitivity of moss to transboundary pollutants largely depends on pollutant types.
机译：大陆亚洲排放的跨界大气污染物被运往日本，对山区生态系统构成严重威胁。跨界污染物的PB同位素比（PB-207 / PB-206和PB-208 / PB-206）通常高于日本在日本国内污染物的那些。因此，本研究通过检测苔藓中较高的Pb同位素比来检查跨界污染物对Yatsugatake山脉的影响。基于这项检查，我们讨论了MOSS用于监测跨界污染物的PB同位素比的有用性。随着西北西风的风吹这些污染物到日本，我们假设苔藓的Pb同位素比在山脉的西坡比东坡上更高。此外，由于国产PB污染物的影响较小，这种差异在较高的升高中会更加明显。与这些假设相反，苔藓中的所有Pb同位素比都在研究区域的国内PB污染物的范围内，表明跨界PB污染物对苔藓的影响很小。值得注意的是，苔藓到跨界PB污染物的这些反应与跨界氮污染物的核心不同。这些结果意味着苔藓对跨界污染物的敏感性在很大程度上取决于污染物类型。

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