The potential of Thlaspi caerulescens for phytoremediation of contaminated soils
The potential of Thlaspi caerulescens for phytoremediation of contaminated soils
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DOI：
10.1023/a:1004328816645
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发表时间：
1998-06-01
期刊：
影响因子：
4.9
通讯作者：
Gregg, PEH
中科院分区：
文献类型：
--
作者：
Robinson, BH;Leblanc, M;Gregg, PEH
吸收镉，锌，铅和锰的超富集植物Thlaspi caerulescens进行了研究盆栽试验中的植物生长单位和人口的野生植物生长在铅/锌碱金属矿山废物在法国南部的Les Malines。盆栽试验使用了里尔地区奥比的金属污染土壤。野生植物中锌和镉的平均含量分别为1.16%和0.16%（干重）。植物的未施肥生物量为2.6 t/ha。每公顷施用一种含上述重金属的肥料作物可去除锌60 kg、镉8.4kg。盆栽和野生植物的实验表明，金属浓度（干重基础上）高达1%的锌（4%的锌在土壤中）和刚刚超过0.1%的镉（0.02%的镉在土壤中）。植物中的金属含量与植物可用的分数在土壤中的乙酸铵提取测量呈负相关，与pH值。生物富集系数（植物/土壤金属浓度的比值）一般高于镉比锌，除了在低金属浓度在土壤中。有一种趋势，这些系数增加，降低土壤中的金属浓度。有人建议，植物修复使用Thlaspi caerulescens将是完全可行的低水平的镉，只有一个单一的作物将需要减半的镉含量为10微克/克的土壤中。在一个经济的时间框架内，将永远不可能修复锌浓度升高（
Uptake of Cd, Zn, Pb and Mn by the hyperaccumulator Thlaspi caerulescens was studied by pot trials in plant growth units and in populations of wild plants growing over Pb/Zn base-metal mine wastes at Les Malines in the south of France. The pot trials utilised metal-contaminated soils from Auby in the Lille area. Zinc and Cd concentrations in wild plants averaged 1.16% and 0.16% (dry weight) respectively. The unfertilised biomass of the plants was 2.6 t/ha. A single fertilised crop with the above metal content could remove 60 kg of Zn and 8.4 kg Cd per hectare. Experiments with pot-grown and wild plants showed that metal concentrations (dry weight basis) were up to 1% Zn (4% Zn in the soil) and just over 0.1% Cd (0.02% Cd in the soil). The metal content of the plants was correlated strongly with the plant-available fraction in the soils as measured by extraction with ammonium acetate and was inversely correlated with pH. Bioaccumulation coefficients (plant/soil metal concentration quotients) were in general higher for Cd than for Zn except at low metal concentrations in the soil. There was a tendency for these coefficients to increase with decreasing metal concentrations in the soil. It is proposed that phytoremediation using Thlaspi caerulescens would be entirely feasible for low levels of Cd where only a single crop would be needed to halve a Cd content of 10 mu g/g in the soil. It will never be possible to remediate elevated Zn concentrations within an economic time frame (