On S. krylovii+A. friqida, the richness index and Shannon-Wiener index of the plant communities were the lowest, while the Simpson index was higher and the Pielou index was the highest.

• 克氏针茅+冷蒿群落的物种丰富度指数和物种多样性指数最低，生态优势度指数较高，群落均匀度指数高于其他3种群落；