修复重金属污染土壤,保障粮食生产安全是当务之急。采用盆栽实验研究了不同浓度重金属胁迫下(Cd、Pb、Cr)能源作物甜高粱和玉米不同器官Cd、Pb、Cr含量、富集系数以及冠部累积量。结果表明：Cd胁迫下,甜高粱不同器官Cd含量、富集系数以及冠部累积量(6.28-59.71μg)均高于玉米；Pb胁迫下,玉米不同器官Pb含量、富集系数以及冠部累积量(223.71-652.44μg)均高于甜高粱；随Cr浓度的增加,甜高粱和玉米不同器官Cr含量、富集系数以及冠部累积量均呈上升趋势,但在Cr胁迫下甜高粱和玉米的生物量较小,因此冠部Cr累积量小。相比之下,甜高粱适合修复Cd污染土壤,玉米适合修复Pb污染土壤,但该两种作物均不适合修复Cr污染土壤。
英文摘要:
Repairing heavy metal pollution of soil to ensure food safety is a top priority. Pot experiment has been conducted to study the contents of Cd, Pb and Cr in plant organs of sweet sorghum and maize under different concentrations of heavy metal stress (Cd, Pb, Cr). The results showed that Cd content, enrichment coefficient and crown accumulation (6.28-59.71μg) in different organs of sweet sorghum were higher than those of maize under Cd stress. Under Pb stress, the Pb content, enrichment coefficient and crown accumulation (223.71-652.44μg) of different organs in maize were higher than sweet sorghum. The content of Cr, the enrichment coefficient and the crown accumulation in the different organs of sweet sorghum and maize showed an increasing trend. But under the Cr stress, the biomass of sweet sorghum and maize were small comparatively, with a low Cr accumulation. In contrast, sweet sorghum is suitable for repairing Cd-contaminated soil, and maize is suitable for repairing Pb-contaminated soil, but neither crop is suitable for repairing Cr-contaminated soil.
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