Analysis of economic character evolvement of the desert grassland of Seriphidium transillense in different degenerate stages

Main economic character of the desert grassland of Seriphidium transillense is investigated and analyzed under different degenerate stages,result shows that the Seriphidium transillense desert grassland evolves from undegenerate stage to serious degenerate stage,extremely degenerate stage;a series of changes in composition of plant species,community height,coverage,yield of grassland has taken place;plant species decreased,the plant height,coverage,yield declined,value of feeding is descended;showing worse forage rating, lower utilization and the evolvement from good pasture to middle-low pasture.