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首页> 外文期刊>Plant and Soil >Zinc and cadmium uptake by the hyperaccumulator Thlaspi caerulescens in contaminated soils and its effects on the concentration and chemical speciation of metals in soil solution.
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Zinc and cadmium uptake by the hyperaccumulator Thlaspi caerulescens in contaminated soils and its effects on the concentration and chemical speciation of metals in soil solution.

机译：超富集性拟南芥在污染土壤中对锌和镉的吸收及其对土壤溶液中金属的浓度和化学形态的影响。

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The hyperaccumulator Thlaspi caerulescens was grown in seven different soils collected from around Europe that had been contaminated with heavy metals by industrial activity or the disposal of sewage sludge to land. Zinc accumulation factors (shootconcentration/initial soil solution concentration) ranged from 3500 to 85 000 with a mean value of around 36 000. This compares with mean accumulation factors of 636, 66 and 122 for Cd, Ca and Mg, respectively. The concentration of Zn in the shoots was much greater than in the roots. The total removal of Zn and Cd ranged from 8 to 30 and from 0.02 to 0.5 mg kg-1 soil, respectively. The Zn concentration in shoots of T. caerulescens correlated, using a curvilinear relationship, with the initial Zn concentration in soil solution (R2 = total Zn 0.78; Zn2+ 0.80). There was no relationship between the uptake of Zn and the total Zn concentration in the soil. In most soils, solution pH increased only slightly after growth of T. caerulescens, indicating that acidification was not the mechanism used to mobilize Zn in the soil. Dissolved organic carbon concentrations generally increased but characterization of the component organic compounds was not attempted. The concentrations of Zn and Cd in soil solution decreased considerably after growth of T. caerulescens. The percentages of Zn and Cd in soil solution present as free ions also decreased. However, the decrease of Zn in soil solution after growth accounted for only about 1% of the total Zn uptake by T. caerulescens. This was much lower than for Cd, Ca and Mg. The results suggest that either T. caerulescens was highly efficient at mobilizing Zn which was not soluble initially, or the soils used had large buffering capacities to replenish soil solution Zn within a short time. This work highlights the need to investigate the role of root exudates in the mobilization of Zn and Cd in soils by the hyperaccumulator T. caerulescens.
机译：超富集性拟南芥（Thlaspi caerulescens）生长在从欧洲各地收集的七种不同土壤中，这些土壤已因工业活动或污水污泥的处置而被重金属污染。锌的累积因子（射击浓度/土壤初始浓度）范围为3500至85 000，平均值约为36000。与此相比，镉，钙和镁的平均累积因子分别为636、66和122。枝条中的锌含量远高于根部。锌和镉的总去除量分别为8至30和0.02至0.5 mg kg-1土壤。利用曲线关系，青枯菌芽中的锌浓度与土壤溶液中的初始锌浓度相关（R2 =总Zn 0.78; Zn2 + 0.80）。锌的吸收与土壤中总锌的含量之间没有关系。在大多数土壤中，溶液的pH值仅在淡色锥虫生长后才略有增加，这表明酸化不是动员土壤中Zn的机制。溶解的有机碳浓度通常会增加，但未尝试表征有机成分。蓝藻生长后，土壤溶液中锌和镉的含量明显下降。以游离离子形式存在于土壤溶液中的锌和镉的百分比也降低了。然而，生长后土壤溶液中锌的减少仅占淡色锥虫吸收锌总量的1％左右。这远低于Cd，Ca和Mg。结果表明，无论是芥蓝还是高效率的动员最初不溶的锌，或者所用的土壤都具有很大的缓冲能力，可以在短时间内补充土壤中的锌。这项工作强调需要研究根系分泌物在超级蓄积拟南芥中在土壤中锌和镉的迁移中的作用。

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