In order to evaluate whether there is a synergistic interaction on soil enzyme activities, nutrient cycling
and pollutants, the correlation between the relative inhibition of soil urease activity and soil nitrifying
activity were depicted in Fig. 1, and a significant positive correlation was found between them (P < 0.05).
The correlation coefficient was found to be 0.942 (R2), which reflect that heavy metals had similar effect
on soil nitrogen cycling and it s relative microbial activity.