Catchments serve as natural integrators of biogeochemical, hydrological, and ecological processes across terrestrial and aquatic ecosystems. This session brings together interdisciplinary research exploring how landscape heterogeneity, ecosystem interactions, and Critical Zone processes influence water quality and ecosystem functioning across spatial and temporal scales.

We welcome contributions addressing the effects of land-water continuum dynamics, including the transport and fate of nutrients, carbon, and pollutants, and how these are shaped by both natural variability and anthropogenic pressures. Particular emphasis is placed on the integration of terrestrial and aquatic carbon and nitrogen fluxes, reactive solute transport, and the coupled water-rock-vegetation interactions that govern nutrient cycling and stream chemistry.

Studies that apply innovative field observations, multi-scale monitoring, or modeling approaches—from catchment experiments to landscape-scale budgets—are encouraged. We also invite work that highlights methodological advances and conceptual frameworks relevant for long-term ecosystem monitoring, Critical Zone science, and sustainable management of freshwater systems under changing environmental conditions.