Precipitation impacts on vegetation spring phenology on the Tibetan Plateau - Shen, Miaogen (Chinese Academy of Sciences. Institute of Tibetan Plateau Research) ; Piao, Shilong (Chinese Academy of Sciences. Institute of Tibetan Plateau Research) ; Cong, Nan (Chinese Academy of Sciences. Institute of Tibetan Plateau Research) ; Zhang, Gengxin (Chinese Academy of Sciences. Institute of Tibetan Plateau Research) ; Jassens, Ivan A. (University of Antwerp)