The distribution and influence factors of total amount and 7 forms of Cd in soils of northern Enshi of Hubei were studied, and the effects of soil factors on the Cd forms were analyzed. The results showed that Cd mainly existed in the available form as composing 44.11％ of the total amount, while the exchangeable proportion was 35.60％, indicating stronger activity than other inert metal. The correlation between Cd availability and total amount of soil was 0.924. The activity of Cd would be more obvious with the increase of total amount soil Cd. Comparing with neutral and alkaline soil, the propotion of exchangeable and available form accounted for the highest percentage of the total amount, were 37.68％ and 44.54％ in acidic soil respectively, Cd ion with strong activity. Furthermore, with the increase of soil organic matter, the water solubility of Cd decreased slightly, while the medium utilization increased, that inducing the inhibitation of Cd pollution potentiality to certain extent.%以湖北恩施北部地区土壤为对象,研究了区内土壤中Cd元素的全量和7种形态的分布及影响因素,并分析土壤各因素对Cd各形态的影响.结果表明,Cd主要以易利用态存在,占全量比达44.11％,Cd的可交换态比例为35.60％,较其他惰性金属活性强.Cd的易利用态与全量相关性为0.924, Cd的活性随着全量的增加会更加明显;土壤酸碱度对重金属形态影响也较大,相比中性、 碱性土壤,酸性土壤中可交换态和易利用态占全量百分比最高,分别为37.68％、 44.54％, Cd离子 具有极强的活性度.另外,随着土壤有机质的增加,Cd水溶态稍有减少,中等利用态稍有升高,Cd的污染能力受到一定程度的限制.
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