Precipitation regulates the responses of xylem phenology of two dominant tree species to temperature in arid and semi-arid forest of the southern Altai Mountains - Wang, Wenjin (Chinese Academy of Sciences. South China Botanical Garden) ; Huang, Jian-Guo (Zhejiang University. College of Life Sciences) ; Zhang, Tongwen (Institute of Desert Meteorology (Ürümqi, Xina)) ; Qin, Li (Institute of Desert Meteorology (Ürümqi, Xina)) ; Jiang, Shaowei (Chinese Academy of Sciences. South China Botanical Garden) ; Zhou, Peng (Guangzhou Institute of Forestry and Landscape Architecture) ; Zhang, Yaling (Chinese Academy of Sciences. South China Botanical Garden) ; Peñuelas, Josep (Centre de Recerca Ecològica i d'Aplicacions Forestals)