Mercury cycling in boreal ecosystems: The long-term effect of acid rain constituents on peatland pore water methylmercury concentrations
Mercury cycling in boreal ecosystems: The long-term effect of acid rain constituents on peatland pore water methylmercury concentrations
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DOI：
10.1029/2000gl011867
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发表时间：
2001-04-01
影响因子：
5.2
通讯作者：
Nilsson, M
中科院分区：
文献类型：
--
作者：
Branfireun, BA;Bishop, K;Nilsson, M
硫酸盐还原菌已被确定为汞（Hg）的主要甲基化剂在实验室和现场调查。然而，没有研究调查长期沉积的硫酸盐对泥炭地甲基汞（甲基汞）动态的影响，这是已知的重要来源甲基汞下游沃茨在北方森林区。作为一个辅助实验，一个更大的项目调查酸雨成分对泥炭地碳动力学的影响，实验升高的Na 2SO 4和/或NH 4 NO3沉积对泥炭孔隙水甲基汞浓度的影响，确定使用一个简单的围隔实验设计。三年后，增加相当于20世纪80年代在瑞典南部干和湿沉积量的S导致泥炭孔隙水甲基汞浓度高达6倍以上的背景水平。氮负荷升高对孔隙水甲基汞浓度没有影响。
Sulphate-reducing bacteria have been identified as primary methylators of mercury (Hg) in the laboratory and in field investigations. However, no studies have investigated the effect of long-term deposition of sulphate on methylmercury (MeHg) dynamics in peatlands, which are known to be significant sources of MeHg to downstream waters in the boreal forest zone. As an ancillary experiment to a larger project investigating the effects of acid rain constituents on peatland carbon dynamics, the influence of experimentally elevated Na2SO4 and/or NH4NO3 deposition on peat pore water MeHg concentrations was determined using a simple mesocosm experimental design. After three years, additions of S in amounts equivalent to the 1980s dry and wet deposition in Southern Sweden resulted in peat pore water MeHg concentrations up to six times above background levels. Elevated N loads had no effect on pore water MeHg concentrations.