Soils play an essential role in the global cycling of carbon and understanding the stabilisation mechanisms behind the preservation of soil organic carbon (SOC) pools is of globally recognised significance. Until recently, research into SOC dynamics has predominantly focused on acidic soil environments and the interactions between SOC and aluminium (Al) or iron (Fe). The interactions between SOC and calcium (Ca) have typically received less attention, with fewer studies conducted in alkaline soils. Although it has widely been established that exchangeable Ca (CaExch) positively correlates with SOC concentration and its resistance to oxidation, the exact mechanisms behind this relationship remain largely unidentified. This presentation will critically assesses available evidence on the potential role of Ca in the stabilisation of SOC, while also presenting observations of Ca-SOC association from various spatial scales (field, aggregate, molecular).
Date: 7th October, 2022 TIME: 2:00 - 3:00 PM EAT