Research questions in my lab focus broadly on biogeochemical interactions between microbes and their chemical environment, and how these exchanges affect ecosystem functioning.  Using interdisciplinary, multi-scale approaches, we seek an integrated understanding of the biogeochemical controls on (1) climate change induced, sea-level rise on C, N and P cycling in freshwater tidal wetlands of the Delaware Estuary, (2) carbon accumulation and decomposition dynamics in northern boreal, western Canadian peatlands under future predicted scenarios of global climate change, (3) The role of atmospheric S deposition on CO₂ and CH₄ production in peatlands of Canada and the Czech Republic, (4) effects of anthropogenic disturbances (e.g., acid coal mine drainage, heavy metal deposition) on nutrient cycles in aquatic and terrestrial ecosystems, (5) greenhouse gas (CO₂, CH₄ and N₂O) production from a variety of ecosystems, including rainforest soils in Hawaii.