Abstract:

Quantitative analysis of influencing factors on chemical form of soil Cu in Kunshan City of Jiangsu Province was carried out.The results show that：(1)Content of soil available Cu is 837 mg/kg，content of soil total Cu is 2743 mg/kg，available rate of soil Cu is 3102%.(2)Content of soil Cu among different chemical form is residue>bound to organic matter>bound to iron and manganese oxides>bound to carbonates and exchangeable.Residue content is obviously higher than the content of others，it gets to 4783%，and proportion of Cu bound to organic matter is relatively higher，it gets to 3609%.(3)The pH value is most important for the content of soil exchangeable Cu，and they get extremely significant positive correlation level.Content of total Cu is most important for the content bound to carbonates，bound to iron and manganese oxides，bound to organic matter，and residue content，and they also get extremely significant positive correlation level.(4)Content of soil total Cu is important for the content of soil exchangeable Cu，and they get significant positive correlation level.The pH value is relatively important for the content of soil Cu bound to carbonates.CEC is important for the content of soil Cu bound to iron and manganese oxides.Content of organic matter is important for the content of soil Cu bound to organic matter，and they get extremely significant positive correlation level.Content of soil clay less than 001 mm is important for the content of soil residue Cu.