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

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Lead isotope ratios in moss for the assessment of transboundary pollutants in the Yatsugatake Mountains, central Japan
Ecological Research ( IF 1.7 ) Pub Date : 2021-01-18 , DOI: 10.1111/1440-1703.12205
Yoshitaka Oishi ₁ , Ki‐Cheol Shin ₂ , Ichiro Tayasu ₂

Affiliation

Transboundary atmospheric pollutants emitted from mainland Asia are transported to Japan and pose a serious threat to mountain ecosystems. Pb isotope ratios (²⁰⁷Pb/²⁰⁶Pb and ²⁰⁸Pb/²⁰⁶Pb) 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.

中文翻译：

苔藓中的铅同位素比，用于评估日本中部八岳山脉的跨界污染物

从亚洲大陆排放的跨界大气污染物被运到日本，对山区生态系统构成了严重威胁。铅同位素比（²⁰⁷ Pb / ²⁰⁶ Pb和²⁰⁸ Pb / ²⁰⁶Pb）的跨界污染物通常高于日本表征国内污染物的污染物。因此，本研究通过检测苔藓中较高的Pb同位素比，研究了跨界污染物对八岳山的影响。在此检查的基础上，我们讨论了苔藓中铅同位素比对监测跨界污染物的有用性。当西北风向西风将这些污染物运到日本时，我们假设在山区的西坡上，苔藓中的Pb同位素比会比在东坡上更高。此外，由于国内铅污染物的影响较小，这种差异在更高的海拔高度将更加明显。与这些假设相反，在整个研究区内，苔藓中的所有Pb同位素比均在家用Pb污染物的范围内，这表明跨界Pb污染物对苔藓的影响很小。值得注意的是，苔藓对跨界Pb污染物的响应与对跨界氮污染物的响应不同。这些结果表明，苔藓对越境污染物的敏感性在很大程度上取决于污染物的类型。

更新日期：2021-01-18

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