期刊
INTERNATIONAL JOURNAL OF PHYTOREMEDIATION
卷 16, 期 5, 页码 482-495出版社
TAYLOR & FRANCIS INC
DOI: 10.1080/15226514.2013.798616
关键词
soil contamination; cadmium; phytoextraction; poplar; stand age
资金
- National Natural Science Foundation of China [NSFC 51178209, 91025015]
- Lanzhou University
- Fundamental Research Funds for the Central Universities in Lanzhou University [lzujbky-2012-141]
- Chinese Ministry of Education [2012021111018]
To investigate the phytoextraction potential of Populus alba L. var. pyramidalis Bunge for cadmium (Cd) contaminated calcareous soils, a concentration gradient experiment and a field sampling experiment (involving poplars of different ages) were conducted. The translocation factors for all experiments and treatments were greater than 1. The bioconcentration factor decreased from 2.37 to 0.25 with increasing soil Cd concentration in the concentration gradient experiment and generally decreased with stand age under field conditions. The Cd concentrations in P. pyramidalis organs decreased in the order of leaves > stems > roots. The shoot biomass production in the concentration gradient experiment was not significantly reduced with soil Cd concentrations up to or slightly over 50mg kg(-1). The results show that the phytoextraction efficiency of P. pyramidalis depends on both the soil Cd concentration and the tree age. Populus pyramidalis is most suitable for remediation of slightly Cd contaminated calcareous soils through the combined harvest of stems and leaves under actual field conditions.
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