To examine the spatial changes of microbial metabolic activity in an iron mine upstream from Miyun Reservoir,the microbial activity and microcalorimetry heat metabolism activity index were applied in the method of calorimety and microcalorimetry from different sample sites. The results showed that: w( Cu),w( Cd),w( Zn) and w( Cr) of different soil sampling sites were higher than the Beijing local soil background values. In samples with relatively low degree of heavy metal pollution( S6,S7 and S8),the urease...