Impact of Mining Tailings on Soil Decomposition and Carbon Stabilisation in a Riparian Atlantic Forest

This study investigates the impacts of mining tailings on soil decomposition processes in a riparian Atlantic Forest ecosystem, focusing on the Samarco dam disaster in Brazil. Understanding these impacts is vital for restoration and management of contaminated environments. We employed the Tea Bag Index method to measure soil decomposition rates ( k ) and stabilisation factors ( S ) at contaminated and reference sites across different seasonal conditions. Soil chemical and physical properties were analysed to determine their influence on decomposition processes. Results indicated significantly lower decomposition rates in contaminated soils compared to reference sites, particularly during wet conditions and at mid-incubation periods. The stabilisation factor was lower in contaminated soils, suggesting a reduced capacity for carbon sequestration. Seasonal variations significantly affected decomposition dynamics, highlighting the complex interactions between environmental conditions and soil contamination. The study underscores the profound impact of mining tailings on soil ecological functions, particularly on decomposition rates and carbon stabilisation. These findings are crucial for developing strategies to mitigate the impacts of such disturbances and enhance the resilience and recovery of affected ecosystems.