Fig. 2From: Grazing intensity changed the activities of nitrogen assimilation related enzymes in desert Steppe PlantsEffects of grazing intensity on total nitrogen content, nitrate reductase activity in roots and leaves of Stipa breviflora and contents of ammonium nitrogen and nitrate nitrogen content in rhizosphere soil of Stipa breviflora. a and b total nitrogen content (g kg− 1), c and d nitrate reductase activity (µg g− 1 h− 1), e ammonium nitrogen content (mg g− 1), f nitrate nitrogen content (mg kg− 1). Different lowercase letters indicate significant difference at P<0.05. CK, LG, MG and HG refer to no grazing, light grazing, moderate grazing and heavy grazing, respectivelyBack to article page