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Underestimated Sink of Atmospheric Mercury in a Deglaciated Forest Chronosequence

文献类型：期刊论文

作者Wang, Xun7,8; Yuan, Wei8; Lin, Che-Jen1,2; Luo, Ji5,6; Wang, Feiyue4; Feng, Xinbin3,8; Fu, Xuewu3,8; Liu, Chen8; Luo Ji
刊名ENVIRONMENTAL SCIENCE & TECHNOLOGY
出版日期2020-07-07
卷号54期号:13页码:8083-8093
ISSN号0013-936X
DOI10.1021/acs.est.0c01667
通讯作者Wang, Xun(wangxun@swu.edu.cn) ; Feng, Xinbin(fengxinbin@vip.skleg.cn)
英文摘要Mercury (Hg) deposition through litterfall has been regarded as the main input of gaseous elemental mercury (Hg-0) into forest ecosystems. We hypothesize that earlier studies largely underestimated this sink because the contribution of Hg-0 uptake by moss and the downward transport to wood and throughfall is overlooked. To test the hypothesis, we investigated the Hg fluxes contributed via litterfall and throughfall, Hg pool sizes in moss covers and woody biomass as well as their isotopic signatures in a glacier-to-forest succession ecosystem of the Southeast Tibetan Plateau. Results show that Hg-0 depositional uptake and pool sizes stored in moss and woody biomass increase rapidly with the time after glacier retreat. Using the flux data as input to a Hg isotopic mixing model, Hg deposition through litterfall accounts for 27-85% of the total accumulation rate of Hg-0 in organic soils of glacial retreat over 20-90 years, revealing the presence of additional sources of Hg-0 input. Atmospheric Hg-0 accounts for 76 +/- 24% in ground moss, 86 +/- 15% in tree moss, 62-92% in above ground woody biomass (branch-bark-stem), and 44-83% in roots. The downward decreasing gradient of atmospheric Hg-0 fractions from the above ground woody biomass to roots suggests a foliage-to-root Hg transport in vegetation after uptake. Additionally, 34-82% of atmospheric Hg-0 in throughfall further amplifies the accumulation of He from atmospheric sources. We conclude that woody biomass, moss, and throughfall represent important Hg-0 sinks in forest ecosystems. These previously unaccounted for sink terms significantly increase the previously estimated atmospheric Hg-0 sink via litterfall.
WOS关键词GASEOUS ELEMENTAL MERCURY ; ISOTOPIC COMPOSITION ; DRY DEPOSITION ; ICE-CORE ; FLOOR IMPLICATIONS ; ORGANIC-MATTER ; HG ; POLLUTION ; PRECIPITATION ; ACCUMULATION
资助项目Strategic Priority Research Programs of the Chinese Academy of Sciences ; Pan-Third Pole Environment Study for a Green Silk Road (Pan-TPE)[XDA2004050201] ; National Natural Science Foundation of China[41977272] ; National Natural Science Foundation of China[41703135] ; National Natural Science Foundation of China[41829701] ; National Natural Science Foundation of China[41430754] ; National Natural Science Foundation of China[41771062] ; Fundamental Research Funds for the Central Universities[SWU019037]
WOS研究方向Engineering ; Environmental Sciences & Ecology
语种英语
WOS记录号WOS:000548584900039
出版者AMER CHEMICAL SOC
资助机构Strategic Priority Research Programs of the Chinese Academy of Sciences ; Pan-Third Pole Environment Study for a Green Silk Road (Pan-TPE) ; National Natural Science Foundation of China ; Fundamental Research Funds for the Central Universities
源URL[http://ir.imde.ac.cn/handle/131551/35134]  
专题成都山地灾害与环境研究所_山地表生过程与生态调控重点实验室
通讯作者Wang, Xun; Feng, Xinbin
作者单位1.Lamar Univ, Ctr Adv Water & Air Qual, Beaumont, TX 77710 USA
2.Lamar Univ, Dept Civil & Environm Engn, Beaumont, TX 77710 USA
3.Chinese Acad Sci, Ctr Excellence Quaternary Sci & Global Change, Xian 710061, Peoples R China
4.Univ Manitoba, Ctr Earth Observat Sci, Dept Environm & Geog, Winnipeg, MB R3T 2N2, Canada
5.Minist Water Conservancy & Power, Chengdu 610041, Peoples R China
6.Chinese Acad Sci, Inst Mt Hazards & Environm, Key Lab Mt Surface Proc & Ecol Regulat, Chengdu 610041, Peoples R China
7.Southwest Univ, Coll Resources & Environm, Interdisciplinary Res Ctr Agr Green Dev Yangtze R, Chongqing 400715, Peoples R China
8.Chinese Acad Sci, Inst Geochem, State Key Lab Environm Geochem, Guiyang 550081, Peoples R China
推荐引用方式
GB/T 7714		 Wang, Xun,Yuan, Wei,Lin, Che-Jen,et al. Underestimated Sink of Atmospheric Mercury in a Deglaciated Forest Chronosequence[J]. ENVIRONMENTAL SCIENCE & TECHNOLOGY,2020,54(13):8083-8093.
APA Wang, Xun.,Yuan, Wei.,Lin, Che-Jen.,Luo, Ji.,Wang, Feiyue.,...&Luo Ji.(2020).Underestimated Sink of Atmospheric Mercury in a Deglaciated Forest Chronosequence.ENVIRONMENTAL SCIENCE & TECHNOLOGY,54(13),8083-8093.
MLA Wang, Xun,et al."Underestimated Sink of Atmospheric Mercury in a Deglaciated Forest Chronosequence".ENVIRONMENTAL SCIENCE & TECHNOLOGY 54.13(2020):8083-8093.

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来源：成都山地灾害与环境研究所

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