DOI: 10.1002/2016GB005471
Scopus记录号: 2-s2.0-85011634524
论文题名: Mobility and transport of mercury and methylmercury in peat as a function of changes in water table regime and plant functional groups
作者: Haynes K ; M ; , Kane E ; S ; , Potvin L ; , Lilleskov E ; A ; , Kolka R ; K ; , Mitchell C ; P ; J
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2017
卷: 31, 期: 2 起始页码: 233
结束页码: 244
语种: 英语
英文关键词: climate change
; mercury
; methylmercury
; runoff
; snowmelt
; wetland
Scopus关键词: climate change
; concentration (composition)
; ecosystem function
; functional group
; hydrological response
; mercury (element)
; mesocosm
; methylmercury
; mobility
; peatland
; plant community
; runoff
; sedge
; shrub
; snowmelt
; solute transport
; vegetation cover
; water table
; wetland
; Houghton County
; Michigan
; United States
; Ericaceae
英文摘要: Climate change is likely to significantly affect the hydrology, ecology, and ecosystem function of peatlands, with potentially important but unclear impacts on mercury mobility within and transport from peatlands. Using a full-factorial mesocosm approach, we investigated the potential impacts on mercury mobility of water table regime changes (high and low) and vegetation community shifts (sedge-dominated, Ericaceae-dominated, or unmanipulated control) in peat monoliths at the PEATcosm mesocosm facility in Houghton, Michigan. Lower and more variable water table regimes and the loss of Ericaceae shrubs act significantly and independently to increase both total Hg and methylmercury concentrations in peat pore water and in spring snowmelt runoff. These differences are related to enhanced peat decomposition and internal regeneration of electron acceptors which are more strongly related to water table regime than to plant community changes. Loss of Ericaceae shrubs and an increase in sedge cover may also affect Hg concentrations and mobility via oxygen shuttling and/or the provision of labile root exudates. Altered hydrological regimes and shifting vegetation communities, as a result of global climate change, are likely to enhance Hg transport from peatlands to downstream aquatic ecosystems. ©2017. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/77772
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Physical and Environmental Sciences, University of Toronto Scarborough, Toronto, ON, Canada; Department of Geography, University of Toronto, Toronto, ON, Canada; School of Forest Resources and Environmental Science, Michigan Technological University, Houghton, MI, United States; Northern Research Station, USDA Forest Service, Houghton, MI, United States; Northern Research Station, USDA Forest Service, Grand Rapids, MN, United States
Recommended Citation:
Haynes K,M,, Kane E,et al. Mobility and transport of mercury and methylmercury in peat as a function of changes in water table regime and plant functional groups[J]. Global Biogeochemical Cycles,2017-01-01,31(2)