超累积植物与高生物量植物提取镉效率的比较
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国家农业部948重大国际合作-养分资源综合管理资助项目(2004-Z53)


Comparison of phytoextraction efficiency of Cd with the hyperaccumulator Thlaspi caerulescens and three high biomass species
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    摘要:

    利用植物修复污染的土壤已受到广泛的关注。采用土壤盆栽试验,比较了超累积植物遏蓝菜与3种高生物量植物印度芥菜、烟草和向日葵对长期施用含镉有机、无机肥料污染的土壤(总Cd,2.87mg·kg-1)的提取效率。研究结果表明,遏蓝菜富集镉的能力明显高于其他3种植物,其地上部镉含量可达43.7mg·kg-1,分别是烟草、印度芥菜和向日葵(叶)的10、27和56倍;而地上部生物量最高的植物烟草,其生物量干重为24.8g·pot-1,分别是遏蓝菜、印度芥菜、向日葵的35倍、3倍、2倍。4种植物提取镉最多的是烟草,每盆可以提取117μg,遏蓝菜和印度芥菜提取镉量分别为35μg·pot-1和30μg·pot-1,向日葵提取量最少,每盆仅为10μg左右。植物对土壤中镉的提取效率分别为:烟草 1%,遏蓝菜0.6%,印度芥菜 0.5%,向日葵0.08%。4种植物种植后,土壤总镉和有效态镉含量没有显著的变化。

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    Phytoremediation has attracted much more attention in environmental cleanup. The relatively low biomass and slow growth of metal hyperaccumulators restrict the efficiency of phytoextraction of heavy metals using these plants. The objective of this study was to compare the efficiency of phytoextraction of cadmium (Cd) with the hyperaccumulator Thlaspi caerulescens and three high biomass plant species (India mustard, tobacco and sunflower). A pot experiment was conducted using a soil contaminated with Cd (2.87 mg·kg-1) from past application of manure and fertilizer with Cd for long time. The results showed that the Thlaspi caerulescens had a higher ability of Cd accumulation than other three plants species. The Cd concentration in the shoots of Thlaspi caerulescens reached 43.7 mg·kg-1, whereas only 1.7 mg·kg-1 Cd was found in the shoots of sunflower. Cd concentration in the shoots of Thlaspi caerulescens was 10, 27 and 56 times of that of tobacco, Indian mustard, and sunflower, respectively. However, tobacco had the highest biomass, which was 35, 3 and 2 times of Thlaspi caerulescens, Indian mustard and sunflower, respectively. Total uptake of Cd from the soil was 117, 35, 30 and 10 μg·pot-1 for tobacco, Thlaspi caerulescens, India mustard and sunflower, respectively. Phytoextracion efficiency was 1%, 0.6%, 0.5% and 0.08% for tobacco, Thlaspi caerulescens, India mustard and sunflower, respectively. Furthermore, there was no significant difference in either total or extractable Cd concentration in the soil after the four plant species were harvested.

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杨勇,王巍,江荣风,李花粉*.超累积植物与高生物量植物提取镉效率的比较.生态学报,2009,29(5):2732~2737

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