为了解不同绿化时间段道路绿地土壤中重金属的含量特征,采集了南京市中心城区不同绿化时间段道路绿地土壤0~5cm、5—20cm土样共50个。土壤经微波消解后,用原子吸收分光光度计分别测定土壤中cu、zn、Pb、cd和cr的全量。结果表明,南京城市土壤中cu、zn、Ph、cd和cr的全量分别为38.8±14.3、113.4±25.5、53.1±27.7、0.114±0.06、51.8±8.9mg/kg,最高值约为最低值的2.4~18.5倍。从变异系数来看,除zn、cr元素的变异系数在20%左右,其它重金属元素均%In order to study the accumulation characteristic of heavy metals in road greenbelt soil in different green time, soil samples with 0 -5 cm and 5 - 20 em depth of road greenbelt were collected at the centre of Nanjing City. After microwave digestion of so
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