Isotope dilution method was adopted in lab for the study of the effect of crude oil contamination on the rate of nitrogen mineralization and nitrification in soil.

在实验室中用同位素示踪法，研究了土壤中不同石油污染量对氮矿化及硝化速率的影响。

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The results showed that the effect of lime-nitrogen on the inhibition of nitrification is obvious, and it inhibited urease activity and decreased the hydrolytic rate of urea.

结果表明，石灰氮对硝化作用有明显的抑制效应，并能抑制脲酶活性，延缓尿素水解。

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The batch experiments indicated the nitrification rate of MBR were higher than AS and the organic carbon removal rate and denitrification rate were almost equal.

在静态实验中，MBR中污泥的硝化速率明显高于AS，有机物降解速率和反硝化速率几乎相等。

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