Abstract: This paper studied the Cu and Zn status in soil and rice plant as well as the soil enzyme activities in the sewage irrigation area near a smeltery.The results showed that the soils near the smeltery were polluted.The soil total and extractable Cu contents at the distance of 100 m were 182.45 and 81.91 mg·kg^-1,respectively,9.3 and 34 times higher than the control.The Cu concentration in different parts of rice was in order of root>leaf and stem> grain,while the Zn concentration was in order of leaf and stem>root>grain.Zn was more mobile than Cu which was likely to accumulate in rice root.It was considered that root could act as a barrier which retarded the upwards transport of Cu and protected the above ground parts of rice from toxication. The Cu contents of rice stem and leaf had a significant correlation with soil Cu contents in the sewage irrigation area.Among the three test enzymes,urease was the most sensitive one to Cu,and its activity had a significant correlation with soil Cu content.Therefore,it is feasible to use soil urease activity as an indicator of soil Cu pollution in sewage irrigation area near the smeltery.

Key words: SARS, Coronavirus, Gene recombination, Life evolution, Combined pollution