Climate warming increases spring phenological differences among temperate trees - Geng, Xiaojun (Beijing Normal University. College of Water Sciences) ; Fu, Yongshuo H.. (Beijing Normal University. College of Water Sciences) ; Hao, Fanghua (Beijing Normal University. College of Water Sciences) ; Zhou, Xuancheng (Beijing Normal University. College of Water Sciences) ; Zhang, Xuan (Beijing Normal University. College of Water Sciences) ; Yin, Guodong (Beijing Normal University. College of Water Sciences) ; Vitasse, Yann (Swiss Federal Institute for Forest. Snow and Landscape Research) ; Piao, Shilong (Sino-French Institute for Earth System Science) ; Niu, Kechang (Nanjing University. School of Life Science) ; De Boeck, Hans J. (Universiteit Antwerpen. Departement Biologie) ; Menzel, Annette (Technical University of Munich. School of Life Sciences) ; Peñuelas, Josep (Centre de Recerca Ecològica i d'Aplicacions Forestals)