Functional diversity and soil nutrients regulate the interannual variability in gross primary productivity - Yan, Pu (Chinese Academy of Science. Institute of Geographic Sciences and Natural Resources Research) ; Zhang, Jiahui (Chinese Academy of Science. Institute of Geographic Sciences and Natural Resources Research) ; He, Nianpeng (Chinese Academy of Science. Institute of Geographic Sciences and Natural Resources Research) ; Zhang, Weikang (Chinese Academy of Science. Institute of Geographic Sciences and Natural Resources Research) ; Liu, Congcong (Chinese Academy of Science. Institute of Geographic Sciences and Natural Resources Research) ; Fernández-Martínez, Marcos (Centre de Recerca Ecològica i d'Aplicacions Forestals)