昆山市农业土壤基本性质与重金属含量及二者的关系

Relationship Between Heavy Metals and Basic Properties of Agricultural Soils in Kunshan County

研究了昆山市农业土壤基本性质和土壤中的重金属含量,并对二者的相关关系进行了分析。结果表明:昆山市农业土壤基本全为壤土,土壤pH值平均为6.50,土壤有机质平均含量为30.53g/kg,土壤CEC平均值为17.51cmol/kg,且各区之间变幅不大;昆山市主要污染重金属Cd、Pb和Hg全量大小排序基本为黄泥土>青泥土>青紫土>乌栅土;土壤重金属含量和土壤理化性质间的关系复杂,如全量As与pH值、有机质含量和全N含量呈极显著负相关,而全量Hg与土壤中有机质含量、全N含量、碱解N含量、CEC呈极显著正相关。

Soil properties and heavy metal contents of agriculture soils in Kunshan county were studied for relationships between soil properties and contents of soil heavy metals. Results showed that almost all the soil samples collected from Kunshan Area were of loamy soil with an average pH value being 6.50, an average content of organic matter being 30.53 g/kg and CEC being 17.51cmol/kg, but three parameters did not vary much from site to site; in terms of total content of the major heavy metal pollutants, Cd, Pb and Hg, in the soils of that region, the four types of soils were in the decreasing order of Huangni soil 〉 Qingni soil 〉 Qingzi soil 〉 Wushan soil; and the results of correlation analysis showed that relationships between soil heavy metals and soil physical and chemical properties were very complicated.