Wildfires are significant watershed disturbances that induce immediate and long-term consequences on terrestrial and aquatic biogeochemistry by altering carbon and nutrient cycles, hydrological activity, erosion and sediment transport, and in-stream metabolism. The interconnectivity of terrestrial and aquatic domains is often overlooked in our collective investigations of disturbance impacts on biogeochemical cycles. Consequently, process-based representations of disturbance impacts on ecosystems remain poorly represented in modelling frameworks, and the cascade of effects from landscape fire disturbances into aquatic systems over temporal scales remains poorly understood. Advancing our understanding requires a span of molecular to large scale investigations across sub-daily to multidecadal time scales. This session invites contributions that provide new insights on the role of fire disturbance in terrestrial and/or aquatic biogeochemical cycles with studies that address the short- and long-term dynamics across scales particularly encouraged.