To investigate the effects of different concentrations of chlorpyrifos on soil ecological environment and on soil respiration, catalase, urease, and levansucrase activity, studied by laboratory simulation methods. The results showed that: different concentrations of chlorpyrifos on soil respiration has a significant activation effect only at the first day, and a positive correlation with the concentration; different concentrations of chlorpyrifos on soil catalase activity is not significant; the inhibition of soil urease is not significant at the concentration of 10mg/kg, while the inhibition is significant at 100mg/kg and 500mg/kg; no significant effects on the soil levansucrase activity when the concentration is 10mg/kg in the first 10 days, but significant in the later days and the situation is contrary to the above when the chlorpyrifos concentration is 100mg/kg and 500mg/kg.
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