According to the results of PCA, urease, alkaline phosphatase, and protease activity could be a better index to evaluate soil fertility in dry land than catalase and invertase activity.

• 根据主成分分析结果,旱地土壤肥力状况用脲酶、碱性磷酸酶、蛋白酶活性作为综合评价指标优于过氧化氢酶与蔗糖酶。