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• W2285107946 abstract "Developing critical loads for nitrogen (N) in theAthabasca Oil Sands Region (AOSR) requires an understanding of thehydrological connectivity and potential for N transport amonguplands, fens and bogs typical in the wetland-rich Boreal region ofnorthern Alberta. The Cumulative Environmental ManagementAssociation’s (CEMA) overarching mandate is to determine a nitrogencritical load specific to the Boreal region of northern Alberta. Tothis end, nitrogen amendment experiments were initiated at twoBoreal wetland sites: an upland – rich fen gradient at Jack PineHigh (JPH) and an upland – fen – bog mosaic at Mariana Lakes (ML),45 km north and 100 km south of Fort McMurray respectively. Theobjectives of this study are to use geochemical and isotopictracers to describe baseline hydrogeochemical variability andconnectivity between bog, fens and upland areas in the AOSR. Siteswere instrumented with piezometer nests and water table wells alongtransects that cover the targeted landscape units (n = 108 samplinglocations). Fieldwork related to this thesis was conducted duringthe open-water season: in June and August 2011, and in May, July,and September 2012. Field campaigns also included a snow survey(March 2012), and spring melt/freshet sampling (April 2012). Theanalysis of spatiotemporal variability of water isotopes andgeochemistry in the years 2011-2012 yielded: i) a characterizationof baseline conditions from which perturbations can be assessed,and ii) evidence of connectivity among landscape units. Noevidence for elevated concentrations of nitrogen related to theamendment experiments was found in 2011 or 2012. The baselinecharacterization and annual monitoring did show increasingconcentrations of inorganic ammonium with increasing depthassociated with increasing solute concentrations: averageconcentrations of inorganic ammonium were 23 mg/L at deepestsampling locations (7 m) at ML bog and ML fen landscape units.These ammonium concentrations in porewaters, given a porosity of0.90 for peatlands, constitute a store of ammonium that may be asignificant source of nitrogen if the hydrology is altered due toco-occurring changes in vegetation (due to, for example, elevatednitrogen inputs), climate and/or landuse. Hydrologic connectivityat JPH is likely driven by topography. Hydraulic head in 2011 and2012 field seasons showed that flow persisted from the upland tothe fen. The consistent and distinct geochemical signatures andisotopic labelling of mid-depth and deep groundwater samples of fenand upland landscape units is consistent with such a stablegroundwater continuum. Near-surface water samples at JPH fenhowever varied hydrogeochemically in response to seasonal changesin precipitation inputs, water levels, and biogeochemicalproductivity. At ML, hydrological connectivity is a function ofantecedent moisture conditions (which determines run-off) and lowand variable (10-6 to 10-9 m/s) hydrological conductivity of thepeatland substrate (which may result in lateral flow wherehydraulic…" @default.
• W2285107946 created "2016-06-24" @default.
• W2285107946 creator A5008153207 @default.
• W2285107946 date "2014-01-01" @default.
• W2285107946 modified "2023-09-23" @default.
• W2285107946 title "Baseline hydrogeochemistry and connectivity among landscape units of two wetland-rich Boreal sites in the Athabasca Oil Sands Region, Alberta" @default.
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