Do Interspecific Differences in the Stable Hydrogen Isotopic Composition of n-Alkanes Reflect Variation in Plant Water Sources or in Biosynthetic Fractionation?

Jennifer E Johnson, Carnegie Institution for Science, Department of Global Ecology, Stanford, United States, Brett James Tipple, University of Utah, Department of Biology, Salt Lake City, UT, United States, James R Ehleringer, University of Utah, Salt Lake City, UT, United States, Julio L Betancourt, U.S. Geological Survey, Science and Decisions Center, Reston, VA, United States, Steven W Leavitt, University of Arizona, Tucson, AZ, United States and Russell K Monson, University of Arizona, School of Natural Resources and the Environment, Tucson, AZ, United States