Hydrologic Fluctuations Resulting From Climatic Variability Cause Methylation Events in Peatlands Impacted by Elevated Sulfate Deposition

Details Hydrologic Fluctuations Resulting From Climatic Variability Cause Methylation Events in Peatlands Impacted by Elevated Sulfate Deposition Hydrologic Fluctuations Resulting From Climatic Variability Cause Methylation Events in Peatlands Impacted by Elevated Sulfate Deposition

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufm.b11g..04c&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #B11G-04

Mathematics

Logic

0414 Biogeochemical Cycles, Processes, And Modeling (0412, 0793, 1615, 4805, 4912), 0483 Riparian Systems (0744, 1856), 0497 Wetlands (1890), 1890 Wetlands (0497)

Scientific paper

A long-term sulfate addition experiment at the Marcell Experimental Forest of northern Minnesota has demonstrated the stimulatory effect of sulfate on mercury methylation at the ecosystem scale. Wetland margins have been shown to be principal zones of methylmercury (MeHg) production in sulfur-limited peatlands, but this research illustrates how the hydrologically isolated center of a small peatland effectively becomes a hot spot when exposed to elevated, atmospheric sulfate deposition. Furthermore, the chronic effects resulting from experimentally elevated sulfate deposition lead to the formation of a pool of reduced sulfur compounds highly sensitive to the changing redox conditions created by hydrologic and climatic variability. Our data reveal that water table rises following extended periods of drought cause natural "sulfate additions" and stimulate mercury methylation. This phenomenon was even observed in our control treatment following a severe drought in 2006. Hydrologic events that increase connectivity between the central bog and dominant wetland flowpaths, such as the infrequent, intense precipitation events predicted for this region by climate change models, could significantly increase MeHg flux from similar wetland systems.

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