Tracing water use sources in rubber monoculture and rubber-Alpinia oxyphylla agroforestry systems using hydrogen and oxygen isotopes - Weiqing Lin; Bingsun Wu; Jingjing Wang; Yongyi Liang; Zixuan Wang; Zixun Chen; Xiaoyan Lin; Guitong Li; Huichun Ye; Ying Zhang; Jinlong Zhu (Journal of Hydrology, 2026)