SS3.12 Large Scale Ecosystem Manipulations
Date: Thursday, June 13, 2002
Time: 4:30:00 PM
Location: Carson C
 
Hall, B, D, University of Alberta, Edmonton, Canada, bhall@ualberta.ca
BodalyRA, Experimental Lakes Area, Fisheries and Oceans Canada, Winnipeg, Canada, 
Beaty, K, G, Experimental Lakes Area, Fisheries and Oceans Canada, Winnipeg, Canada, 
Hendzel, L, L, Experimental Lakes Area, Fisheries and Oceans Canada, Winnipeg, Canada, 
Matthews, C, J, University of Alberta, Edmonton, Canada, 
Paterson, M, J, Experimental Lakes Area, Fisheries and Oceans Canada, Winnipeg, Canada, 
Rolfhus, K, R, University of Wisconsin at La Crosse, La Cross, USA, 
St.Louis, V, L, University of Alberta, Edmonton, Canada, 
Schiff, S, L, University of Waterloo, Waterloo, Canada, 
Venkiteswaran, J, J, University of Wateloo, Waterloo, Canada, 
 
MERCURY CYCLING AND GREENHOUSE GAS FLUXES FROM FLOODED BOREAL FOREST UPLANDS: THE FLUDEX (FLOODED UPLANDS DYNAMICS EXPERIMENT) PROJECT AT THE EXPERIMENTAL LAKE
image
The purpose of the FLUDEX project is to study mercury dynamics and greenhouse gas fluxes from boreal reservoirs in a controlled manner. Three reservoirs that flooded boreal forests were created at the ELA. Each reservoir is about 0.7 ha (mean depth ~ 1 m). The reservoirs differed in the type of vegetation flooded and amount of organic carbon stored primarily in soils. We hypothesized that methyl mercury (MeHg) production and GHG fluxes would be related to the amount of stored organic carbon. However, fluxes of MeHg from flooded soils, MeHg in water and biota, and CO2 in surface water were not directly related to the total carbon stored, although methane concentrations generally were. The reservoirs acted as weak sinks for atmospheric N2O. MeHg in water and biota and CO2 in water were generally similar in to a previously flooded wetland, despite much higher stores of organic C in the wetland. However, rates of decomposition in the FLUDEX reservoirs (and the production of MeHg and CO2) slowed significantly after only the first year of flooding.