苎麻镉耐受性及其修复镉污染土壤潜力研究

为阐明苎麻修复Cd污染土壤的可行性,应用田间微区试验,研究了苎麻对Cd的耐受能力、累积特性及其对土壤Cd污染修复的潜力.结果表明.低浓度Cd处理(添加<10 mg/kg土)能促进苎麻生长,高浓度Cd处理(添加>10 mg/kg土)则引起毒害,但添加Cd浓度达到100 mg/kg土时,苎麻仍可完成正常生理周期,原麻产量仅比对照降低27.6%.苎麻出麻率受土壤Cd污染影响较小.添加Cd量在65 mg/kg内时,随添加量的增大,苎麻对Cd的富集量增加,而富集系数在10.01～4.55范围内逐渐减小.在中低程度Cd污染土壤种植苎麻可以切断食物链,产生较好的经济和环境效益,应用前景良好,但其修复Cd污染土壤需要较长时间,应进一步选育Cd超积累苎麻品种.

Tolerance and Phytoremediation Potential of Ramie for Cadmium Contaminated Soil

To illuminate the phytoremediation feasibility of ramie for cadmium contaminated soil, a farmland microplot experiment was made to study the potential of tolerance, accumulate trait and remediation for Cd. The results showed that with low Cd application (<10 mg/kg soil), the growth of the ramie was improved; ramie injured when Cd concentration exceeded 10 mg/kg soil. The ramie could tolerate concentration of Cd as high as 100 mg/kg with the biomass of the aboveground of ramie was 27.6% lower than the control. The uptake of Cd by ramie increased as the addition amount (<65 mg/kg soil) of Cd increased, the bioaccumulation coefficient (BC) reduced from 4.55 to 1.01. For low or moderate Cd contaminated soil, using ramie could prevent the harm of Cd apart from the food chain, and bring great economical and environmental benefits, has bright application prospects. Forecasting result show that a longer period of time would be needed for improving the Cd contaminated soil, a further selection and cultivation of Cd hyperaccumulator ramie is essential.