Abstract: Six isozymes of Leymus chinensis from desert, typical, marsh and saline-alkali grasslands stretching across the Inner Mongolia to Jilin Province of China were studied. Cluster classification indicates that there existed a certain intraspecific differentiation of isozymes of L. chinensis in different geographic habitats, which was affected by comprehensive effects of many environmental factors, and internally related to the cold-resistance of the grass.

Key words: Leymus chinensis, Isozyme, Intraspecific differentiation, Cluster classification