Urease activity in the soil of the alpine meadow was determined from June to October in 1984 (Table 1). Experimental results indicated that the urease activity showed markedly seasonal dynamics.The peaks of urease activities in soils of four experimental plots were appeared from June to August (Figure 1) .Results of experiments also showed that the urease activities were changed with deepening of soil. Urease activities were highest in soils of surface layer and diminish with the increase of soil depth (Fig...