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Denitrification is a vital process impacting nitrogen characteristics in grounds. In this study, abundances of denitrification genes (narG, nirK, nirS, and nosZ) and activities of nitrite reductase (S-NiR), nitrate reductase (S-NR) were calculated in heavy-metal polluted soils with different amendments of biochar and compost. The relationships between physical-chemical parameters, denitrification gene variety, and enzyme activity had been analyzed by Pearson correlation strategy. Results showe