Stable Isotope Evidence Shows Re-emission of Elemental Mercury Vapor Occurring after Reductive Loss from Foliage | |
Wei Yuan; Jonas Sommar; Che-Jen Lin; Xun Wang; Kai Li; Yi Liu; Hui Zhang; Zhiyun Lu; Chuansheng Wu; Xinbin Feng | |
2019 | |
发表期刊 | Environmental Science & Technology |
卷号 | 53期号:2页码:651-660 |
摘要 | The mechanism of elemental mercury (Hg0) re-emission from vegetation to the atmosphere is currently poorly understood. In this study, we investigated branch-level Hg0 atmosphere-foliage exchange in a pristine evergreen forest by systematically combining Hg isotopic composition, air concentration and flux measurements to unravel process information. It is found that the foliage represents a diurnally changing sink for atmospheric Hg0 and its Hg content increases with leaf age and mass. Atmospheric Hg0 is the dominant source of foliar Hg and the involvement of HgII is not supported by isotopic evidence. Upon Hg0 uptake, maturing foliage becomes progressively enriched in lighter Hg isotopes and depleted in odd mass isotopes. The measured isotopic composition of foliage Hg and isotopic shift caused by Hg0 evasion from foliage supports that Hg0 emitted from foliage is derived from Hg previously metabolized and bound in the leaf interior then subsequently recycled after reduction, and not merely a retroflux of recently deposited Hg0 on foliar surface. An isotopic differential mass balance model indicates that the proportion of foliar Hg0 efflux to uptake gradually increase from emergence to senescence with an average flux ratio of 30%. |
收录类别 | SCI |
语种 | 英语 |
文献类型 | 期刊论文 |
条目标识符 | http://ir.gyig.ac.cn/handle/42920512-1/10257 |
专题 | 环境地球化学国家重点实验室 |
作者单位 | 1.State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China 2.Center for Advances in Water and Air Quality, Lamar University, Beaumont, Texas 77710, United States 3.Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Mengla 666303, China 4.Anhui Province Key Laboratory of Environmental Hormone and Reproduction, Fuyang Normal University, Anhui 236037, Chin 5.University of Chinese Academy of Sciences, Beijing 100049, China |
推荐引用方式 GB/T 7714 | Wei Yuan,Jonas Sommar,Che-Jen Lin,et al. Stable Isotope Evidence Shows Re-emission of Elemental Mercury Vapor Occurring after Reductive Loss from Foliage[J]. Environmental Science & Technology,2019,53(2):651-660. |
APA | Wei Yuan.,Jonas Sommar.,Che-Jen Lin.,Xun Wang.,Kai Li.,...&Xinbin Feng.(2019).Stable Isotope Evidence Shows Re-emission of Elemental Mercury Vapor Occurring after Reductive Loss from Foliage.Environmental Science & Technology,53(2),651-660. |
MLA | Wei Yuan,et al."Stable Isotope Evidence Shows Re-emission of Elemental Mercury Vapor Occurring after Reductive Loss from Foliage".Environmental Science & Technology 53.2(2019):651-660. |
条目包含的文件 | ||||||
文件名称/大小 | 文献类型 | 版本类型 | 开放类型 | 使用许可 | ||
Stable Isotope Evide(3481KB) | 期刊论文 | 作者接受稿 | 开放获取 | CC BY-NC-SA | 浏览 请求全文 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论