Rapid migration of Mongolian oak into the southern Asian boreal forest - Tang, Yang (Beijing Normal University. Faculty of Geographical Science. State Key Laboratory of Earth Surface Processes and Resource Ecology) ; Du, Enzai (Beijing Normal University. Faculty of Geographical Science. State Key Laboratory of Earth Surface Processes and Resource Ecology) ; Guo, Hongbo (Beijing Normal University. Faculty of Geographical Science. State Key Laboratory of Earth Surface Processes and Resource Ecology) ; Wang, Yang (Beijing Normal University. School of Natural Resources) ; Peñuelas, Josep (Centre de Recerca Ecològica i d'Aplicacions Forestals) ; Reich, Peter (University of Michigan. Institute for Global Change Biology)