分析了天津郊区不同种菜年限菜园土壤剖面碱性磷酸酶、脲酶、蔗糖酶及蛋白酶活性分布状况,研究了不同施肥措施对土壤酶活性的影响。结果表明,四种酶的活性均随剖面深度呈梯形减弱,随种菜年限的延长而增高,其中脲酶和碱性磷酸酶表现出明显的相关趋势,菜园土壤通体酶活性水平明显高于一般旱田土壤,菜园土壤酶活性与土壤有机质、全氮、全磷、有效磷呈显著或极显著正相关,可以做为衡量土壤肥力水平的指标;有机肥与无机肥配合施用是增强土壤酶活性、提高土壤肥力的有效方法。 The distribution of alkaline phosphatase, urease, invertase and protease activity in soil profiles of different vegetable growing seasons in suburbs of Tianjin was analyzed. The effects of different fertilization measures on soil enzyme activities were also studied. The results showed that the activities of all four enzymes decreased with the trapezoid depth with the depth of cut, and increased with the increase of planting time. Urease and alkaline phosphatase tended to show a significant trend, Soil enzyme activities and soil organic matter, total nitrogen, total phosphorus, available phosphorus was significantly or very significantly positive correlation, can be used as an indicator of soil fertility; organic manure and inorganic fertilizers are used to enhance soil enzyme activity, increased Effective method of soil fertility.