Reduction-oxidation processes play a major role in the biogeochemical cycling of nutrients within the Earth’s Critical Zone, from soils and sediments to aquifers and aquatic systems. Redox processes, driven by hydrology, microbial activity, and climate, regulate the speciation, mobility, and transformation of macronutrients such as carbon, nitrogen, and phosphorus, with consequences for greenhouse gas emissions, biodiversity, and ecosystem functioning. Understanding these processes is critical for predicting how soil and sedimentary ecosystems will respond to global change.
In this session, we invite contributions investigating redox processes coupled to carbon, nitrogen, and phosphorus cycling across aquatic and terrestrial continuum landscapes, soils, groundwater, and freshwater systems. We welcome laboratory and field-based studies as well as modeling approaches that explore mechanisms, controls, and impacts of redox transformations. Studies that link microenvironments to bulk ecosystem behavior or couple geochemical reactions with hydrology are of particular interest. We especially encourage integrative approaches that bridge scales and methods to advance mechanistic insight and predictive understanding of ecosystem functioning.