Effects of Lanthanum on Hydrolytic Enzymes Activities of Paddy Soil in Tai Lake District

The effects of Lanthanum (La) on the activities of acid phosphatase, urease and sucrase of paddy soil in Tai Lake district were studied through simulation experiment. La inhibited acid phosphatase activity of paddy soil, and there was a significant inhibition (p0.05) when La concentration was over 60 mg/kg,and the maximum inhibition rate was 13%. La had no significant effect on urease activity of paddy soil. La stimulated sucrase activity of paddy soil, and there was significant stimulation (p0.05) at 300 mg/kg, and the maximum stimulation rate was 10%.