Nitrogen application to enhance zinc and cadmium uptake by the hyperaccumulatorSedum alfredii
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摘要:以重金属锌、镉超积累植物东南景天Sedum alfredii为研究材料,采用营养液培养法研究了氮素营养对东南景天生长及对重金属锌、镉吸收、积累和转运能力的影响。结果表明:适当的氮素营养能够促进东南景天的生长,提高东南景天地上部富集重金属的能力,在供氮2.50 ~ 5.00 mmolL-1时,东南景天地上部生长和重金属吸收、积累最佳,锌和镉质量分数分别达12.00 gkg-1和2.00 gkg-1。在应用东南景天重金属超积累植物进行土壤重金属污染修复时需要合理施用氮肥,从而提高植物修复土壤重金属污染的效率。图1表4参15Abstract:Two hydroponic culture experiments were conducted in a glasshouse to understand the effect of nitrogen (N) nutrition on growth and the zinc and cadmium (Zn/Cd) uptake by Zn/Cd hyperaccumulator Sedum alfredii. Results showed that both low(0.50 mmolL-1) and excessive(>5.00 mmolL-1) supply of N impaired growth of plant dry matter and reduced plant uptake of Zn and Cd. By contrast,2.50 - 5.00 mmolL-1 of N improved plant growth,increased concentrations of Zn(to 12.00 gkg-1) and Cd (to 2.00 gkg-1) in the shoots,and enhanced partitioning of Zn and Cd from roots to shoots. Thus,to maximize heavy metal phytoremediation efficacy for Zn/Cd contaminated soils in the field,optimal N fertilization of S. alfredii is required.[Ch,1 fig. 4 tab. 15 ref.]
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Key words:
- soil science/
- nitrogen/
- Sedum alfredii/
- hyperaccumulator/
- zinc (Zn)/
- cadmium (Cd)
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- 链接本文:
https://zlxb.zafu.edu.cn/article/doi/10.11833/j.issn.2095-0756.2010.06.005
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