Stable Isotope Evidence Shows Re-emission of Elemental Mercury Vapor Occurring after Reductive Loss from Foliage | |
Yuan, Wei4; Sommar, Jonas; Lin, Che-Jen; Wang, Xun; Li, Kai4; Liu, Yi4; Zhang, Hui; Lu, Zhiyun2; Wu, Chuansheng3; Feng, Xinbin | |
刊名 | ENVIRONMENTAL SCIENCE & TECHNOLOGY |
2019 | |
卷号 | 53期号:2页码:651-660 |
关键词 | Atmospheric Mercury Independent Fractionation Gaseous Mercury Exchange Forest Precipitation Accumulation Deposition Fluxes Air |
ISSN号 | 0013-936X |
DOI | 10.1021/acs.est.8b04865 |
英文摘要 | The mechanism of elemental mercury (Hg-0) re-emission from vegetation to the atmosphere is currently poorly understood. In this study, we investigated branch-level Hg-0 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 Hg-0 and its Hg content increases with leaf age and mass. Atmospheric Hg-0 is the dominant source of foliar Hg and the involvement of Hg-II not supported by isotopic evidence. Upon Hg-0 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 Hg-0 evasion from foliage supports that Hg-0 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 Hg-0 on foliar surface. An isotopic differential mass balance model indicates that the proportion of foliar Hg-0 efflux to uptake gradually increase from emergence to senescence with an average flux ratio of 30%. |
学科主题 | Engineering ; Environmental Sciences & Ecology |
语种 | 英语 |
WOS记录号 | WOS:000456349900011 |
内容类型 | 期刊论文 |
源URL | [http://ir.xtbg.org.cn/handle/353005/11216] |
专题 | 西双版纳热带植物园_支撑系统 |
作者单位 | 1.Chinese Acad Sci, Inst Geochem, State Key Lab Environm Geochem, Guiyang 550081, Guizhou, Peoples R China 2.Lamar Univ, Ctr Adv Water & Air Qual, Beaumont, TX 77710 USA 3.Chinese Acad Sci, Key Lab Trop Forest Ecol, Xishuangbanna Trop Bot Garden, Mengla 666303, Peoples R China 4.Fuyang Normal Univ, Anhui Prov Key Lab Environm Hormone & Reprod, Fuyang 236037, Anhui, Peoples R China 5.Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
推荐引用方式 GB/T 7714 | Yuan, Wei,Sommar, Jonas,Lin, Che-Jen,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 | Yuan, Wei.,Sommar, Jonas.,Lin, Che-Jen.,Wang, Xun.,Li, Kai.,...&Feng, Xinbin.(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 | Yuan, Wei,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. |
个性服务 |
查看访问统计 |
相关权益政策 |
暂无数据 |
收藏/分享 |
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