The primary focus of this project will be to integrate and synthesize information on phosphorus in diverse environments with emphasis on the flows of phosphorus between terrestrial systems, ground waters, rivers, lakes, estuaries, and oceans. Both natural and anthropogenic fluxes in the phosphorus cycle will be assessed in a study of the biogeochemical processes. Particular attention will be paid to phosphorus interactions with other elements (carbon, nitrogen, sulphur and metals)