Effects of Lead on Dehydrogenase Activity in Dry and Red Soil
The change of dehydrogenase activity (DA) in the dry and red soil was researched under different concentrations, single heavy metal, Pb added to the soil and under different incubation periods, which was under incubation experiment in the laboratory. The results showed that in the dry and red soil DA was enhanced with Pb concentration increased below 200 mg/(kg·soil). DA had a peak value when Pb concentration was 100 mg/(kg·soil), DA dropped gradually when Pb concentration was over 200 mg/(kg·soil). DA was restrained more ohviously when Pb concentration was larger over 200 mg/(kg·soil). So 200 mg/(kg·soil) Pb concentration was a watershed to DA in different concentrations. Furthermore, there was a similar change with above different concentrations during different incubation periods. DA was accelerated before incubating 10 days and decreased little by little from incubating 10- 60 days. Thus, the incubating 10th day might be a watershed period on Pb effecting DA under the different incubation time.
Heavy metalLead contaminationDry and red soilSoil dehydrogenase
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