Joost L M Van Haren, University of Arizona, Honors College, Tucson, AZ, United States, Kathrin Kuehnhammer, Forschungszentrum Jülich, Agrosphere Institute (IBG-3), Jülich, Germany, Angelika Kübert, University of Freiburg, Ecosystem Physiology, Freiburg, Germany, Maren Dubbert, University of Bayreuth, Bayreuth, Germany, Markus Tuller, The University of Arizona, Tucson, AZ, United States, Ebrahim Babaeian, University of Arizona, Soil, Water, and Environmental Science, Tucson, AZ, United States, Matthias Beyer, University of Braunschweig, Braunschweig, Germany, Laura K Meredith, University of Arizona, School of Natural Resources and the Environment, Tucson, AZ, United States and Christiane Werner, University of Freiburg, Freiburg, Germany