DOI: 10.1007/s10533-013-9902-9
Scopus记录号: 2-s2.0-84896400505
论文题名: Combined dynamics of mercury and terrigenous organic matter following impoundment of Churchill Falls Hydroelectric Reservoir, Labrador
作者: Teisserenc R. ; Lucotte M. ; Canuel R. ; Moingt M. ; Obrist D.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2014
卷: 118, 期: 2018-01-03 起始页码: 21
结束页码: 34
语种: 英语
英文关键词: Lignin biomarkers
; Mercury
; Reservoir
; Terrestrial organic matter
Scopus关键词: biomarker
; concentration (composition)
; lacustrine deposit
; landscape
; lignin
; mercury (element)
; organic matter
; reservoir
; sediment chemistry
; vegetation structure
; Canada
; Labrador
; Newfoundland and Labrador
英文摘要: Sediments from two recently (40 years) flooded lakes (Gabbro lake and Sandgirt lake) and an unflooded lake (Atikonak lake) were sampled to investigate the effects of reservoir impoundment on mercury (Hg) and terrigenous organic matter (TOM) loading in the Churchill Falls Hydroelectric complex in Labrador, Canada. Lignin biomarkers in TOM, which exclusively derive from terrestrial vegetation, were used as biomarkers for the presence and source origin of TOM-and for Hg due to their close associations-in sediments. In the two flooded Gabbro and Sandgirt lakes, we observed drastic increases in total mercury concentrations, T-[Hg], in sediments, which temporally coincided with the time of reservoir impoundment as assessed by 210Pb age dating. In the natural Atikonak lake sediments, on the other hand, T-[Hg] showed no such step-increase but gradually and slowly increased until present. T-[Hg] increases in lake sediments after flooding were also associated with a change in the nature of TOM: biomarker signatures changed to typical signatures of TOM from vegetated terrestrial landscape surrounding the lakes, and indicate a change to TOM that was much less degraded and typical of forest soil organic horizons. We conclude that T-[Hg] increase in the sediments of the two flooded reservoirs was the result of flooding of surrounding forests, whereby mainly surface organic horizons and upper soil horizons were prone to erosion and subsequent re-sedimentation in the reservoirs. The fact that T-[Hg] was still enriched 40 years after reservoir impoundment indicates prolonged response time of lake Hg and sediment loadings after reservoir impoundments. © 2013 Springer Science+Business Media Dordrecht. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83585
Appears in Collections: 气候减缓与适应 气候变化事实与影响
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作者单位: Collaborative Mercury Research Network, Institut des Sciences de l'Environnement and GEOTOP, Université du Québec à Montréal, Succ. Centre-ville, C.P. 8888, Montreal, QC, H3C 3P8, Canada; Division of Atmospheric Sciences, Desert Research Institute, 2215 Raggio Parkway, Reno, NV, 89512, United States; Université de Toulouse, INP, UPS, CNRS; EcoLab (Laboratoire Ecologie Fonctionnelle et Environnement), ENSAT, Avenue de l'Agrobiopole, Auzeville-Tolosane, BP 32607, 31326 Castanet Tolosan Cedex, France
Recommended Citation:
Teisserenc R.,Lucotte M.,Canuel R.,et al. Combined dynamics of mercury and terrigenous organic matter following impoundment of Churchill Falls Hydroelectric Reservoir, Labrador[J]. Biogeochemistry,2014-01-01,118(2018-01-03)