NDLI: Sulphate Mobilization and Pore Water Chemistry in Relation to Groundwater Hydrology and Summer Drought in two Conifer Swamps on the Canadian Shield

Content Provider	Springer Nature Link
Author	Devito, Kevin J. Hill, Alan R.
Copyright Year	1999
Abstract	Variations in sulphate (SO$_{4}$ $^{2-}$) concentration of porewater and net SO$_{4}$ $^{2-}$ mobilization were related to differences in water level fluctuations during wet and dry summers in two conifer swamps located in catchments which differed in till depth and seasonality of groundwater flow. Sulphate depletion at the surface and in 20 cm porewater coincided with anoxia and occurred mainly during the summer when water levels were near the peat surface and water flow rates were low in both catchments. There was an inverse relationship between net SO$_{4}$ $^{2-}$ mobilization and water level elevation relative to the peat surface, explaining variation in SO$_{4}$ $^{2-}$ dynamics between the swamps during summer drought periods. Aeration of peat to 40 cm and a large net SO$_{4}$ $^{2-}$ mobilization (10–70 mg SO$_{4}$ $^{2-}$ m$^{-2}$ d$^{-1}$) occurred during a dry summer in which the water level dropped to 60 cm below the surface in the swamp receiving ephemeral groundwater inputs from shallow tills within the catchment. This resulted in high SO$_{4}$ $^{2-}$ concentrations in the surface water and porewater (30–50 mg L$^{-1}$), and elevated SO$_{4}$ $^{2-}$ concentrations remained through the fall and winter. In contrast, within the swamp located in the catchment with greater till depth (> 1 m), continuous groundwater inputs maintained surface saturation during the dry summer, and SO$_{4}$ $^{2-}$ mobilization and concentrations of SO$_{4}$ $^{2-}$ in the pore water during the following fall did not increase. Susceptibility to large water table drawdown and mobilization of accumulated SO$_{4}$ $^{2-}$ is influenced by the occurrence of ephemeral vs. continuous groundwater inputs to valley swamps during dry summer periods in the Canadian Shield landscape. This study reveals that extrapolation of results of SO$_{4}$ $^{2-}$ cycling from one wetland to another requires knowledge of the hydrogeology of the catchment in which the wetlands are located.
Starting Page	97
Ending Page	114
Page Count	18
File Format	PDF
ISSN	00496979
Journal	Water, Air, and Soil Pollution
Volume Number	113
Issue Number	1-4
e-ISSN	15732932
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	1999-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Hydrogeology Atmospheric Protection/Air Quality Control/Air Pollution
Content Type	Text
Resource Type	Article
Subject	Ecological Modeling Environmental Chemistry Pollution Environmental Engineering Water Science and Technology

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