The effects of rare earth element lanthanum (La) on the activities of soil invertase, catalase and dehydrogenase in red soil were studied by room culture and pot culture experiments. La had stimulative effect on soil invertase activity in varying degrees; slightly inhibitory effect on the activity of soil catalase; strongly inhibitory effect on soil dehydrogenase activity and the inhibit ion became significant when the concentration of La was over 30 mg/kg. Its inhibition to the activities of soil catalase and dehydrogenase was strengthened continuously with increasing concentration. When incubation time was prolonged, its inhibition to soil dehydrogenase tended to decrease. Soil dehydrogenase activity is a sensitive index on assessing the environmental effects of rare earth element in soils.%通过室内培养和盆栽试验研究了稀土元素镧对红壤转化酶、过氧化氢酶和脱氢酶活性的影响.镧对土壤转化酶活性有不同程度的刺激作用;对土壤过氧化氢活性有轻微的抑制作用;对土壤脱氢酶活性有强烈的抑制作用,当镧浓度为30mg/kg时,抑制作用达到显著水平.随着浓度的升高,镧对土壤脱氢酶和过氧化氢酶活性的抑制作用不断增强.随着培养时间的延长,镧对土壤脱氢酶的抑制作用有降低的趋势.土壤脱氢酶活性是评价稀土元素污染土壤环境的敏感指标.
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