I am broadly interested in the impacts of global change on terrestrial biogeochemical processes, especially soil carbon cycling. I am currently working at long-term nitrogen addition experiments in subarctic boreal and temperate forests, investigating chemical composition of soil organic matter at an attempt of discerning the mechanisms by which enriched nitrogen addition alters the balance of accumulation and decomposition of soil organic matter. I also examine the effects of C transport belowground from plant roots on decomposition and associated changes in C/N fluxes at the soil-plant interface.