The effection of all-weather photosynthesis of Stipa grandis,Leymus chinenesis and Cleistogenes squarrosa between two grazing systems was not significant ,which indicated as the shape of two-humped.

• 放牧制度对大针茅、羊草和糙隐子草的光合日进程影响不大,都表现为双峰型。