Aetivity of soil enzymes的用法和样例：
- Abstrac t: The activities of four kinds of soil enzymes in turfs in different growth years was studied.
- The main factors with the most influence were urease and uratease activities by The Principal Component Analysis of soil enzymes.
- The seasonal regularities of soil enzymatic activities(A horizon)are very evident, it depengdson the sorts of enzymes.
- There are some clods of soil on the mat.
- This kind of soil contains much alkali.