The changes of above-ground biomass, species population and biotope in the grazed and ungrazed grassland in Qinghai Gong-he Basin were studied.

• 试验研究青海共和盆地封育季节草场生物量、种群与生境变化结果表明，封育草地生物量和株高均高于未封育草地，且依据未封育与封育草地生物量之比，共和盆地草场退化等级为中度和重度；