title: Dissolved organic carbon in a constructed and natural fens in the Athabasca oil sands region, Alberta, Canada.
abstract: In the Athabasca oil sands region near Fort McMurray, Alberta, Canada, peatlands are disturbed extensively in order to recover bitumen below the surface. Hence, following oil sands mining, landscape reclamation is a part of the mine closure process in order to return functioning ecosystems, including peatlands, to the region. This study was conducted at a pilot fen reclamation project and three other diverse natural (poor, rich and saline) fens in the oil sands region during the growing seasons of 2013 and 2014, the first and second year post-construction. Ecosystem functioning of the constructed fen (CF) was evaluated with reference to natural fens based on pore water dissolved organic carbon (DOC) concentration and chemistry. Significant variation of DOC concentration among the reference fens was observed, varying from an average of 42.0mg/L at the rich fen (RF) to 70.8mg/L at the saline fen (SF). Dissolved organic carbon concentration at CF was significantly lower than at all reference fens, but increased significantly over the first two years. Seasonal variation of DOC concentration was also observed in each site with concentration increasing over the growing season. At CF, DOC was comprised of larger, more humic and complex aromatic compounds than reference fens in the first year post-construction based on its spectrophotometric properties; however, these differences were reduced in the second year. Initial DOC concentration and chemistry at CF was indicative of the source being largely the peat placed during fen construction. Changes in chemistry and increasing concentration of DOC in the second growing season likely resulted from increasing inputs from plants established on site. These results suggest that DOC concentration is likely to increase in future at CF as vascular plant productivity increases and in response to salinity sourced from tailing sand used to construct the catchment.
authors.affiliation: Department of Geography, University of Calgary, Calgary, AB, Canada.
authors.forename: Bhupesh
authors.initials: B
authors.lastname: Khadka
authors.affiliation: Department of Geography, University of Calgary, Calgary, AB, Canada.
authors.forename: Tariq M
authors.initials: TM
authors.lastname: Munir
authors.affiliation: Department of Geography, University of Calgary, Calgary, AB, Canada; Department of Geography and Environmental Management, University of Waterloo, Waterloo, ON, Canada. Electronic address: mstrack@uwaterloo.ca.
authors.forename: Maria
authors.initials: M
authors.lastname: Strack
keywords: DOC; E2:E3; E4:E6; Peatland; SUVA; Wetland reclamation