Abstract

Coastal saline-alkali soils, characterized by high salinity and alkalinity, present significant challenges for agriculture and environmental management but offer untapped potential for carbon sequestration. This article explores the use of exogenous calcium-induced carbonate formation as a method to enhance carbon sequestration in these soils. By introducing calcium-containing amendments such as calcium carbonate, calcium chloride, or calcium sulfate, the formation of stable calcium carbonate (CaCO3) is promoted, which effectively captures and stores atmospheric CO2. This process not only contributes to mitigating climate change but also improves soil quality, increases agricultural productivity, and supports ecosystem restoration. The application of exogenous calcium modifies soil pH, enhances microbial activity, and leads to the precipitation of calcium carbonate. Despite its benefits, challenges such as cost, soil variability, and environmental impact must be addressed. Future research should focus on optimizing application strategies and exploring alternative calcium sources to maximize the effectiveness of this approach. This method represents a promising tool for advancing sustainable land management and carbon sequestration in coastal salinealkali environments.