Abstract
A field experiment was conducted to investigate the effects of composted sewage sludge’s application on the dynamics change of enzyme activities in aeolian sandy soil. The composted sewage sludge was applied to the soil at 0,2,5,10,15,20 and 25 t·ha-1 respectively. The effects of various sewage sludge dosages on the soil’s enzyme activities were evaluated by measuring urease,sucrase,neutral phosphatase and catalase at different time intervals of 15,50,80,110 and 150 days after the addition of sewage sludge to the soil.The results showed that the urease,sucrase,neutral phosphatase and catalase activities increased to varying degrees as the sewage sludge dosages added to the soil increased. And the four enzyme activities were affected by the sampling time significantly,the urease and sucrase activities reached their maximum values in 50 days,and neutral phosphatase and catalase activities reached their maximum values in 80 days.The results also showed that the application of sewage sludge had positive effects on improving the aeolian sandy soil’s fertility.
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