PhD-Thesis: Quantification of Pedogenic Carbonate Formed Due to Enhanced Weathering in Agricultural Soil and Subsoil
Reza Khalidy, University of Guelph, https://hdl.handle.net/10214/28054
The introduction of powdered Ca and Mg-rich silicate minerals to soil, called enhanced rock weathering, has been found effective in stabilizing atmospheric carbon in the form of solid carbonates. Among different minerals, wollastonite is recognized as the primary candidate for this process due to its high reactivity, simple chemical structure, and known agronomic benefits. The current doctoral thesis aims to investigate the fate of wollastonite over vertical soil profile and assess the migration of weathering products over short-term and long-term time scales. To track migration of weathering products (e.g., pedogenic carbonate and bicarbonates), a laboratory-scaled soil column experiment was conducted over a short term. Furthermore, field-scale experimental trials were carried out to assess the impact of wollastonite ore dosage and soil properties on the formation and downward movement of released metals and carbonates.