天津地区不同年限设施土壤pH及酶活性变化

以天津地区露地土壤作对照,研究了栽培1,2,3,6,12年设施蔬菜土壤有关生物学指标的变化。结果表明,设施土壤脲酶、过氧化氢酶、转化酶活性高于露地,过氧化物酶相反;随着连作年限延长,土壤脲酶活性逐渐增强,而过氧化氢酶、过氧化物酶、转化酶活性开始增强之后减弱。土壤酶活性都由表层向底层逐渐减弱。土壤pH随着栽培年限增加呈逐渐降低趋势。

Changes of pH and Enzyme Activities in Greenhouse Soils of Different Planting Years in Tianjin

In order to provide the scientific basis of preventing soils from degradation and promoting agriculture sustainable development,soil enzyme activities and pH were studied in the greenhouse vegetable soils under different planting years(1,2,3,6 and 12 year)in Tianjin with the open field soil as control.The result indicated that soil urease、catalase and intertase activity were higher in greenhouse vegetable soils than that in open field soil,peroxidase activities were opposite.Soil urease increased gradually with the cultivation years,but soil catalase,peroxidase and intertase activity increased beginning,then decreased.Soil enzyme activities decreased with soil depths.Soil pH declined with the planting years.