中文摘要：

研究菌株A在Cd^2＋存在条件下的生物矿化行为以及所选用菌株修复Cd^2＋污染土壤的效果。结果表明：菌株A的脲酶常数Km为1．231mol／L，Cd^2＋浓度为0．595mg／L时，菌株生长良好；随着Cd^2＋浓度的增加，细菌生长由促进变为抑制。细菌在Cd^2＋污染的水溶液和土壤中仍具有很强的酶活性。游离态Cd^2＋能够与细菌新陈代谢产物CO3^2-形成CdCO3不溶晶体沉淀。通过盆栽实验，经过菌株A对Cd^2＋污染土壤的处理，有效的降低土壤游离态Cd^2＋和植物体内Cd^2＋含量。在土壤、水资源处理方面，菌株A在生物矿化固结重金属有着广阔的应用前景。

英文摘要：

The behavior of biomineralization of bacteria A in the presence of Cd^2＋ and the effect of Cd^2＋ polluted soil repaired by bacteria A were investigated. The results show that while the bacteria A had a high urease constant Km of 1.231 mol/L and the Cd^2＋ concentration was 0.595 mg/L, the bacteria grew well. The growth of bacteria changed from accelerated to restrained with the increase of Cd^2＋ concentration. Bacteria A have high urease activity in Cd^2＋ polluted solution and soil. Free Cd^2＋ ions can react with CO3^2- induced by bacteria urease to form insoluble CdCO3 crystals. By pot experiment, the Cd^2＋ content in soil and Cd^2＋ concentration in wheat can be efficiently reduced after the polluted soil was recovered by bacteria A culture medium. The extensive prospect of applying bacteria A to soil and water remediation has been shown.