[Water utilization strategy of three soil and water conservation trees on Ordos Plateau, China].

To understand the adaptive strategies of three tree species used for soil and water conservation in the hilly area of eastern Ordos Plateau, , and we measured the δO value of xylem water of branch and potential water sources and the δC value of leaves, and analyzed the relative contribution of each potential water sources to different tree species by multiple linear mixing model. We further compared the seasonal dynamic and inter-specific variation of water source and water use efficiency (WUE). The results showed that , and mainly used soil water in 10 cm layer in May, accounting for 88.