Effect of planting grasses on vegetation restoration on the bare land

摘要

Experiment was executed to study characteristics of restoring vegetations after Medicago sativa and Bromus inermis planted on the bare land. The results indicated that vegetations restored rapidly after Medicago sativa and Bromus inermis planted on the bare land in Yanqing county, Beijing. And vegetation cover and aboveground biomass were over 90% and 6275.6kg/hm~2 in the year which Bromus inermis planted. Next year, vegetation cover and aboveground biomass of Medicago sativa grassland were over 90% and 7094.2kg/hm~2. Meanwhile, species reached 9-13, and diversity indices of two grasslands reached 0.032-0.0754 in the year which Bromus inermis and Medicago sativa planted. Then diversity index of Medicago sativa grassland reached 0.6782 next year. Moreover, annual species decreased and perennial species increased in the year which Bromus inermis and Medicago sativa planted. But important value of planted grass decreased and natural grass species increased remarkably next year after Medicago sativa planted, which was beneficial to succession of natural plant community rapidly. However, important value of planted grass increased next year after Bromus inermis planted, which was beneficial to community structure stability of artificial grassland.