Reconstructing Century-Scale Changes in Nitrogen Cycling in Forests Throughout the United States using Tree-Ring δ15N Chronologies

Laci Gerhart-Barley1, Kendra K McLauchlan2, John Battles3, Joseph M Craine2, Philip E Higuera4, Michelle C Mack5, Brenden E McNeil6, David M Nelson7, Neil Pederson8 and Steven S Perakis9, (1)Kansas State University, Manhattan, KS, United States, (2)Kansas State University, Department of Geography, Manhattan, KS, United States, (3)University of California Berkeley, Department of Environmental Science, Policy, and Management, Berkeley, United States, (4)University of Montana, Missoula, MT, United States, (5)Northern Arizona University, Center for Ecosystem Science and Society, Flagstaff, AZ, United States, (6)West Virginia University, Geology and Geography, Morgantown, WV, United States, (7)University of Maryland Center for Environmental Science Appalachian Laboratory, Frostburg, United States, (8)Harvard Forest, Petersham, United States, (9)U S Geological Survey, Corvallis, OR, United States