A Comparison of Mineralization Rates of Uplands Surface Soil vs. Peat-Mineral Mixes Using PRS Probes

This project assessed the mineralization of peat/mineral mixes used in reclamation of mined areas in the Shell Albian Sands. Soil profiles were instrumented with Plant Root Simulator (PRS) probes to monitor nutrient composition and water dynamics. This data was used in predictive modelling to forecast future scenarios.

Inclusion of a Litter-Fermentation-Humus (LHF) layer, a top layer in the soil profile containing natural organic debris, increased species diversity and cover. Findings related to water storage included: (1) textural breaks in the soil layers improved water storage; and (2) water distribution started to shift with vegetation establishment. Findings related to nutrients included: (1) most nutrients (nitrogen, phosphorus, potassium) had higher supply rates in the spring and at the upper slope position; (2) a peat + mineral soil mix resulted in higher rates of nitrate and sulfur; and (3) the LFH layer resulted in higher supply rates of ammonium, potassium, and phosphorus.