Abstract: Seeds of Leymus chinensis collected from different areas of Inner Mongolian are cultivated under different water stress conditions, and characteristics of their one year old plants are compared. The results show that the characteristics of Leymus chinensis have different stability. Through analyses of qualitative cross over interaction, it is suggested that L.chinensis is a kind of drought enduring plant, but its growing is far better under full water condition than under lack water condition. Of all kinds of L.chinensis, A Qi has the most stable characteristics, and of all characteristics, the asexual reproduction (such as tillers, buds of root stock) is more stable than the nutrition (such as plant height, leaf length).

Key words: Leymus chinensis, Water, Characteristics, infiltration, dye tracing, piston flow, Loess Tableland, apple orchard, root