My research is focused on the biogeochemical cycles of nutrients, especially Si, and the linkages between land and aquatic ecosystems. Massive amount of amorphous silica accumulates on land in soils from deposition of plant phytoliths and in lakes as diatoms delaying the export of weathering products from the landscape to aquatic ecosystems. I am interested in long-term trends driven by climate and nutrients and how ecosystems respond to changes in the drivers. I also use paleoecological techniques and analysis of long term monitoring data to help manage aquatic ecosystems.