Table 2 shows the enzyme activities of the soil from the Ishiagu mining area. The soil enzymeactivities decreased with the decrease of distance from the pit. In comparison to the control, there was areduction in dehydrogenase activity by 36.34%, polyphenol oxidase by 20.42%, hydrogen peroxidase by10.45%, alkaline phosphatase by 17.02%, acid phosphatase by 21.15% and urease by 9.32% at 30 meters awayfrom the pit. There were significant positve correlation between the activities of soil enzymes and the soil pH.On the contrary, there were significant negative correlation between the activities of soil enzymes analyzed andthe heavy metal contents of the soil. Data analyses showed a significant negative linear relationship between the heavy metal contents and the activities of the soil enzymes at P ≤0.05 except for Zn against dehydrogenase
activity and Cd against hydrogen peroxidase and urease activities where the correlation were though negative but not statistically significant.
Table 2 shows the enzyme activities of the soil from the Ishiagu mining area. The soil enzymeactivities decreased with the decrease of distance from the pit. In comparison to the control, there was areduction in dehydrogenase activity by 36.34%, polyphenol oxidase by 20.42%, hydrogen peroxidase by10.45%, alkaline phosphatase by 17.02%, acid phosphatase by 21.15% and urease by 9.32% at 30 meters awayfrom the pit. There were significant positve correlation between the activities of soil enzymes and the soil pH.On the contrary, there were significant negative correlation between the activities of soil enzymes analyzed andthe heavy metal contents of the soil. Data analyses showed a significant negative linear relationship between the heavy metal contents and the activities of the soil enzymes at P ≤0.05 except for Zn against dehydrogenaseactivity and Cd against hydrogen peroxidase and urease activities where the correlation were though negative but not statistically significant.
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