Abstract:This paper described the principle and methods of hydrogen stable isotope analyses, and the typical case studies of δD analyses applied to plant water sources researches. The hydrogen isotope composition of source water and plant water can be used to analyze patterns of plant-water use from both a short-term and a long-term perspective and across a broad spectrum of community types and environments, even to partition quantitatively the contribution of different water sources to the plant water uptake in pla...