Abstract: With the vegetations on reclaimed Calamagrostis angustifolia wetland as test objects, this paper studied the change patterns of their community structure and species diversity after different years (5, 8 and 12 years) of natural restoration. After definite years’ restoration, the vegetations had a visible community succession. Plant species increased gradually, dominant species changed from Artemisia stolonifera to C. angustifolia, and species composition differed evidently with restoration year. With the increase of restoration year,  the ShannonWiener index (H) was decreasing, while Simpson index (D) increased after an initial decrease. As for the two plots both with C. angustifolia as the dominant species, the plot with 8-year restoration had a higher H value than that with 12-year restoration. After different years’ restoration, the similarity index of the plant community between the wetlands with 5-year and 8-year restoration was 50%, and that between the wetlands with 5-year and 12-year restoration was 43%, suggesting that there was a definite inherent relationship between plant community composition and restoration year, i.e., the longer the restoration year, the lower the plant community composition similarity.

Key words: Leymus secalimus, Vegetative reproduction generation, Tiller, Rhizome, Bud, Module, Age structure, Clone growth