Gruselle, M.C., I. Fernandez, K. Simon, and S. Norton. 2014 15N enrichment of the forest floorafter a whole watershed scale 15N tra cer addition at a long-term forested paired watershed site in Maine, USA. BIOGEOMON 2014, The 8th International Symposium on Ecosystem Behavior. Bayreuth, Germany. July 14-18, 2014. Gruselle et al 2014 BIOGEOMON (PDF)