Study on the restoration process of enclosed grassland in Xilinguole

The restoration process of the grassland was studied through observing the grassland under enclosure and grazing conditions. The results showed that enclosure to prevent grazing have the obvious effects on vegetation coverage, biomass and net productivity. And the coverage and biomass increased as the time elongating. Moreover，the species diversity of the grassland increased at the early period of enclosure, but the species diversity and the richness decreased as the enclosure time elongating. Long time enclosure could not help to improve the species diversity of the grassland.