Abstract: In order to restore the degraded and desertified grasslands on the northwest plateau of Sichuan, six gramineous species were used to establish various modes with different combinations of plant communities. The community characteristics and ecosystem stability of these combinations indicated that the species diversity in the communities decreased with the increase of evenness (r=0.94). Among the 13 reconstruction modes, the community Elymus nutans+Lolium multiflorum+Festuca rubra+Agropyron desertorum had higher coverage, biological yield, and species diversity, being suitable for the restoration of the degraded and desertified grasslands in northwest Sichuan. Among the test species, Elymus sibiricus, Elymus nutans, and Agropyron desertorum had the highest dominance.

Key words: Forest, Seedling regeneration, Light environmental heterogeneity, Forest succession, Ecological restoration