Abstract: Under conditions of 60,45 and 30% shading, the characters of growth and differentiation of Leymus chinensis clone are studied in greehouse. The results show that low light intensity reduces the biomass accumulation of plant, restrains the growth and differentiation of clone, and decreases the total number of rhizomes and ramets. There exists a significant difference of the length and node number of rhizome and the dry biomass of clone under different light intensities, which is more obvious in spring.

Key words: Light intensity, Clone, Rhizome, Leymus chinensis, Xishuangbanna, litter, tropical montane rain forest, soil, hydrological function