Based on field investigation and sample analysis of polluted soil from Pb

Zn mine in Quzhou county Zhejiang province

microbial activities

soil enzymes activities and heavy metal accumulation in plants were studied. The results showed average value of Pb

Zn

Cd

Cu content in polluted areas were 267.8

132.6

41.8 and 17.0 times of the non-mine soil. Heavy metal concentration in plants was positively correlated with total and available heavy metal concentration in soils. The microbial biomass carbon decreased

whereas basal respiration and qCO2 increased with increasing of heavy metal concentration. The microbial biomass carbon in mine center soil was 72% of control

but basal respiration and qCO2 was 1.6 and 2.3 fold respectively. Each kind of soil enzyme activities was higher than that of the mined soil

among which dehydrogenase activity changed most remarkably

so it can be a better index in evaluation of heavy metal pollution in mine area.