A call for international soil experiment networks for studying, predicting, and managing global change impacts - Torn, M. S.; Chabbi, A.; Crill, P.; Hanson, P. J.; Janssens, I. A.; Luo, Y.; Pries, C. H.; Rumpel, C.; Schmidt, M. W. I.; Six, J.; Schrumpf, M.; Zhu, B. (SOIL, 2015)