地膜覆盖后土壤的温度、湿度、ｐＨ等发生较大的变化，从而影响了土壤的酶活性。在棕壤上定位试验研究的结果表明：覆膜后土壤中过氧化氢酶和脲酶活性显著降低，而提高了中性和酸性磷酸酶活性。施用有机肥可以明显提高过氧化氢酶和脲酶活性，但对这两种磷酸酶的活性影响较小。 After mulching the soil temperature, humidity, pH and so on have a greater change, thus affecting the soil enzyme activity. The experimental results on the brown soil indicate that the activities of catalase and urease in the soil were significantly decreased, and the neutral and acid phosphatase activities were enhanced. The application of organic fertilizer can significantly increase catalase and urease activity, but little effect on the activity of these two phosphatases.