Aquanty Staff Research Highlight – Spatial patterns and mass balance of sodium in near-surface peat of a constructed fen
As always we’re excited to highlight the research of Aquanty staff! This week we are highlighting a recently published article co-authored by Eric Kessel. This study is focused on the Nikanotee Fen Watershed, a reclaimed oil sands landform in the Athabasca Oil Sands Region. Hydrochemical modelling techniques are used to understand the processes governing sodium transport through the fen seven years after it’s initial construction. The findings have important implications for the growth and survival of vegetation within the fen, especially for those plant species with low tolerance for salinity.
Spatial patterns and mass balance of sodium in near-surface peat of a constructed fen
Yang, S., Sutton, O. F., Kessel, E. D., & Price, J. S. (2022). Spatial patterns and mass balance of sodium in near-surface peat of a constructed fen. In Journal of Hydrology: Regional Studies (Vol. 41, p. 101073). Elsevier BV. https://doi.org/10.1016/j.ejrh.2022.101073
Abstract:
At the Nikanotee Fen Watershed, a pioneering reclamation project in the Athabasca Oil Sands Region, elevated sodium (Na+) in the porewater of mine-waste materials has been shown to migrate to the fen through groundwater, likely influencing fen vegetation health. Given the potential of Na+ to steer the ecological development of the fen, the goal of this research is to quantify the spatial distribution of Na+ and to characterize the Na+ mass balance of the surface and shallow subsurface of the fen. For a given time, the highest Na+ concentrations were generally found in the wettest part of the fen in the southwestern corner, and the lowest in the relatively dry northeast corner near the drainage outlet. Na+ concentrations in ponded surface water were responsive to rainfall-induced dilution and evapoconcentration, whereas porewater salinity in shallow groundwater was insensitive to meteorological conditions. Surface discharge controlled the mass efflux of Na+ from the system at an estimated average rate of 4 kg∙day−1 between June and August. Given the relatively small proportion of salt being flushed annually, and the greater rate of mass inflow relative to export, elevated salinity will likely be sustained for several decades. Since elevated Na+ concentrations are impacting the rooting zone of vegetation and have exceeded the salinity stress-threshold of mosses, targeting salt-tolerant vegetation will be important to maintain carbon accumulation in constructed systems.