Guo Ping-yi
2010
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Journal
Journal of Nuclear Agricultural Sciences
Abstract
A pot wheat experiment was conducted to evaluate that the dynamic effects of tribenuron-methyl pollution on the activity of soil urease,alkaline phosphatase and protease were studied. The results showed that except 0. 1 and 0. 5mg /kg first day treatments,the activity of soil urease was all inhibited among other tribenuron-methyl treatments during the early stage (the first 14 days after treatment),and the inhibit effect became greater as the concentration of tribenuron-methyl increased. The activity of soil urease was the least and the highest inhibitory rate reached 74. 8% at the 7th day. But tribenuron-methyl treatment activated soil urease with the highest activating rate of 183. 0% during the later stage ( after 14 days). On the contrary,the effect of tribenuron-methyl treatment on the activity of alkaline phosphatase and protease appeared dosage effect. That is,low-concentration tribenuron-methyl had some activating effect on the activity of alkaline phosphatase and protease,while high-concentration tribenuron-methyl had inhibitory- activating effect. The inhibitory effect on alkaline phosphatase presented during the previous 7 days after treatment,but the effect on protease appeared in the early stage of treatment (the first 14days). Thus the effect of tribenuron-methyl on the activity of soil enzyme not only related to concentration and culture time but also related to types of soil enzyme. The activity of soil urease could be an indicator for the pollution level of tribenuron-methyl in soil in the early stage of tribenuron-methyl pollution.