Under cutting a year off-year, the grass family density changes gently. First decreased and then tended to be stable, while the Liliaceae, Chenopodiaceae and the Compositae densities fluctuations. 割一年休一年的情况下,禾本科植物的密度变化比较平缓,先下降后趋于稳定,而百合科、黎科和菊科植物密度波动较大。