| Shallow groundwater flow was monitored in a discharge, transition and a recharge riparian wetland of an outwash lake and was sampled for SRP, Fe2+, Redox, DO, pH, EC, Ca and DOC concentrations to determine the influence of flowpath on biogeochemistry and SRP sink source behaviour. Large groundwater volumes bypassed the discharge riparian wetland causing it to have little influence on P retention. Infiltration of dilute water, low redox and low pH of the riparian peat in the transition and recharge riparian wetland resulted in increased P mobility and may be a potential source of P to the lake and groundwater. Alternatively, pH and Ca were high in clays and groundwater outside the riparian zone and limited SRP export from the peatlands. The control of the mobility of SRP was found to be a complex relationship of precipitation reactions, sediment adsorption and desorption, vegetation, microbes and the influence of water chemistry. |
