苏南经济快速发展区土壤Cu形态含量影响因素定量分

以江苏省昆山市为典型区，定量研究几种因素对农田土壤Cu形态含量的影响。结果表明：1)土壤有效态Cu含量为837 mg/kg，土壤全Cu含量为27.43 mg/kg，土壤Cu的活化率为31.02%；2)土壤重金属Cu各形态含量相对大小为残渣态(13.82 mg/kg)＞有机质结合态(9.42 mg/kg)＞铁锰氧化物结合态(2.79 mg/kg)＞碳酸盐结合态(0.84 mg/kg)、可交换态(057 mg/kg)，残渣态含量明显高于其它形态，达47.83%，有机质结合态Cu含量也较高，占全量的36.09%；3)pH值是影响可交换态Cu含量的最主要因素，达极显著负相关水平。全Cu含量是影响碳酸盐结合态Cu含量、铁锰氧化物结合态Cu含量、有机质结合态Cu含量和残渣态Cu含量的最主要因素，达极显著正相关水平；4）全Cu含量是影响可交换态Cu含量的重要因素，达显著正相关水平。pH值是影响碳酸盐结合态含量的相对重要因素。CEC是影响铁锰氧化物结合态Cu含量的重要因素。有机质含量是影响有机质结合态Cu含量的重要因素，达极显著正相关水平。＜0.01 mm黏粒含量是影响残渣态Cu含量的重要因素.

QUANTITATIVE ANALYSIS OF INFLUENCING FACTORS ON CHEMICAL FORM OF SOIL CU IN THE REGION WITH HIGH ECONOMY DEVELOPMENT OF SOUTH JIANGSU PROVINCE——A CASE STUDY IN KUNSHAN CITY

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.