Global patterns of foliar nitrogen isotopes and their relationships with climate, mycorrhizal fungi, foliar nutrient concentrations, and nitrogen availability

Joseph M. Craine, Andrew J. Elmore, Marcos P.M. Aidar, Mercedes Bustamante, Todd E. Dawson, Erik A. Hobbie, Ansgar Kahmen, Michelle C. MacK, Kendra K. McLauchlan, Anders Michelsen, Gabriela B. Nardoto, Linda H. Pardo, Josep Peñuelas, Peter B. Reich, Edward A.G. Schuur, William D. Stock, Pamela H. Templer, Ross A. Virginia, Jeffrey M. Welker, Ian J. Wright