里氏木霉FS10-C对伴矿景天吸取修复镉污染土壤的强化作用

为提高伴矿景天对Cd污染土壤的修复效果,通过盆栽模拟试验,研究了木霉(Trichoderma)对伴矿景天生和Cd修复效率的影响.结果表明:Cd的加入抑制了伴矿景天的生长；伴矿景天在Cd含量为5 mg/kg模拟污染土壤中对Cd提取效率最高.在不同Cd污染水平下,里氏木霉(T.reesei)FS10-C使伴矿景天地上部干重比对照组增加了17.1％ ～42.5％,显著提高伴矿景天地上部对Cd的积累；在15 mg/kg Cd处理下,里氏木霉FS10-C处理组植物地上部Cd积累量高于对照组46.2％但对于土壤中NH4OAc提取态Cd含量影响不显著.说明里氏木霉FS10-C能提高伴矿景天对Cd的抗性,增加其生物量,从提高其修复效率.因此,里氏木霉FS10-C具有强化伴矿景天修复Cd污染土壤的应用潜力.

Enhancing remediation of Sedum plumbizincicola in cadmium contaminated soils by Trichoderma reesei FS10-C

A pot experiment was carried out by using Sedum plumbizincicola as a hyper-accumulator to explore effects of Trichoderma reesei FS10-C on phytoremediation of Cd-contaminated soils. Results showed that the growth of T. reesei FS10-C was inhibited in Cd-contaminated soils. S. plumbizincicola grown in 5mg/kg Cd-contaminated soils showed higher phytoextraction efficiency than those in 15mg/kg Cd-contaminated soils. And the treatment of T. reesei FS10-C enhanced plants growth, especially in 15mg/kg Cd-Contaminated soils. The shoots of Sedum plumbizincicola resulted a 17.1%-42.5% increase in dry weight with the treatment of T. reesei FS10-C, respectively (P<0.5). Meanwhile the strain significantly improved Cd uptake. Compared with the non-inoculated plants it was increased by 46.2% in 15mg/kg Cd-contaminated soils. However, the difference of Cd extracted by NH4OAc did not differ significantly between the two treatments and controls. In conclusion, T. reesei FS10-C could enhance the growth of S. plumbizincicola, the biomass of the over-ground part and the phytoextraction efficiency. Thus T. reesei FS10-C has a high value in use in the field of improving phytormediation of Cd-contaminated soils by S. plumbizincicola.