重金属污染土壤的植物修复研究Ⅲ.金属富集植物Brassica juncea对锌镉的吸收和积累
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* 江苏省青年科技基金(BQ98050);国家自然科学基金(49831070、40125005;49831042);国家重点基础研究发展规划项目(G1999011807);中国科学院南京土壤研究所土壤与环境联合开放研究实验室基金项目资助


STUDY ON PHYTOREMEDIATION OF HEAVY METAL POLLUTED SOILS Ⅲ. CADMIUM AND ZINC UPTAKE AND ACCUMULATION BY INDIAN MUSTARD(Brassica juncea)
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    摘要:

    采用温室盆栽试验研究了印度芥菜对土壤中锌镉污染的忍耐、积累能力,以检验这种植物修复Zn、Cd污染土壤的可能性及其潜力。在加入Zn500和1000mgKg-1的土壤中,印度芥菜生长66天后,叶片中积累Zn的平均浓度分别达280和662mgKg-1,地上部带走的Zn分别为每盆2195和3412μg。在加入Cd200mgKg-1的土壤中生长的印度芥菜,叶片中积累Cd浓度为161mgKg-1,地上部带走的Cd为每盆381μg。和普通植物相比,印度芥菜更能将Zn和Cd从根运输到地上部。Zn500mgKg-1处理的土壤在种植印度芥菜后其NH4NO3提取的Zn显著高于不种植物的处理;土壤添加Cd200mgKg-1的处理NH4NO3提取的Cd也显著高于不种植物的处理,可能的原因是植物根分泌出特殊的分泌物,专一性地螯合溶解根系附近的难溶态Zn和Cd,从而提高土壤溶液中的浓度。印度芥菜对Zn、Cd有较强的忍耐和富集能力,是Zn、Cd污染土壤修复有潜力的植物。

    Abstract:

    A pot experiment with Indian Mustard (Brassica juncea) growing on soils spiked with Zn and Cd was conducted to study metal tolerance and accumulation by B.juncea,and its potential for phytoremediation.Average Zn concentration in the leaves were 280 and 662 mg Kg-1 respectively for 66 days growing in the soil spiked with 500 and 1 000 mg Kg-1 Zn,Zn removed by plant shoots were 2 195 and 3 412 g pot-1,respectively.Average Cd concentration in the leaves was 161 mg Kg-1 in the soil spiked with 200 mg Kg-1 Cd,and Cd removed by the shoots was 381 g pot-1.B.juncea showed a higher ability in translocating Zn and Cd from roots to shoots compared to ordinary crops.NH4NO3 extractable Zn and Cd increased after the growth of B.juncea compared with blank (without plants).Those results can not be fully explained by the natural equilibrium between solid and solution phase.The root exudates possibly involved in incrasing metal solubilisation.It can be concluded that Brassica juncea appeared to be a moderate Zn and Cd accumulator making it suitable for phytoremediation of zinc and cadmium contaminated soil.

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蒋先军,骆永明,赵其国.重金属污染土壤的植物修复研究Ⅲ.金属富集植物Brassica juncea对锌镉的吸收和积累[J].土壤学报,2002,39(5):664-670. DOI:10.11766/trxb200102190507 Jiang Xian-jun, Luo Yong-ming, Zhao. STUDY ON PHYTOREMEDIATION OF HEAVY METAL POLLUTED SOILS Ⅲ. CADMIUM AND ZINC UPTAKE AND ACCUMULATION BY INDIAN MUSTARD(Brassica juncea)[J]. Acta Pedologica Sinica,2002,39(5):664-670.

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  • 收稿日期:2001-02-19
  • 最后修改日期:2001-08-22
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  • 在线发布日期: 2013-02-25
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