Characteristics of Allium Sativum L. Accumulating Cd in Contaminated Soil

The Cd concentration in 28 vegetables and soil environment of Urumqi outskirts were analyzed. By comparing with Cd accumulation coefficient of the vegetables, it was found that Allium sativum L. has the strongest ability of accumulating Cd. Based on this, Allium sativum L. was taken as the experiment material. The Cd accumulation characteristics of Allium sativum L. was primarily determined by a test with different settings of Cd concentration gradient simulated in pots. The results show that the accumulation coefficient of Cd is evidently higher than those of other vegetables. When the Cd concentration is 50 mg/kg in the alkaline soil, the Cd content in the aboveground part of the Allium sativum L. reaches 15 mg/kg, and the underground part is 48.7 mg/kg. It indicates that Allium sativum L. has a stronger ability in restoring Cd contaminated soil.