苏南经济快速发展区土壤Cu形态含量影响因素定量分析——以昆山市为例

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

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 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 4...