Abstract:

For better evaluating the effects of pesticide on soil Environment, the method of earthworm toxicity test was used to study the earthworm’s activity of superoxide dismutase (SOD) and acetylcholinesterase (AChE ) impacted by different concentration pollution of dimethoate and dimehypo. The results showed that the SOD activity of earthworm was significantly lower (P<0.05) than that of CK after contaminated by dimethoate and dimehypo expect for one of combined procession, and it had no significant relationship between the variation of SOD activity and the concentration of dimethoate and the concentration of compound contamination, but showed a decreasing trend with the increase of dimehypo’s concentration overall, there were significant differences (P<0.05) between contamination time (24h and 48h). The AChE activity of earthworm showed a very significant (P<0.01) inhibition contaminated by dimethoate, and it didn’t show obvious regularity by Dimehypo, the AChE activity of earthworm was significantly (24 h) or very significantly (48 h) inhibited by compound contamination. Therefore, the earthworms SOD could be used to evaluate the soil contamination by dimehypo indirectly, and earthworm’s AChE activity could be a better evaluation quota on soil pollution by dimethoate.