Transpiration and water use sources of poplar (Populus × xiaozhuanica) plantations with 7-years vs. 20-years old in a semiarid sandy region of Northeast China - Lining Song; Jiaojun Zhu; Xin Liu; Jinxin Zhang; Xiao Zheng; Yirong Sun; Guochen Wang; Linyou Lü (Agricultural and Forest Meteorology, 2024)