Comparing Soil and Bison δ13C to Field Estimates of C4 Plant Abundances in North America

Daniel Griffith1, Christopher J Still1, Jen Cotton2 and Becky Powell3, (1)Oregon State University, Forest Ecosystems and Society, Corvallis, OR, United States, (2)Oregon State University, Corvallis, OR, United States, (3)University of Denver, Geography and the Environment, Denver, CO, United States