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Hydroponic experiments conducted to examine the chromiun uptake by C. communis in the presence of different Cr concentrations (Cr6+ 100 and 200 mg/L, respectively) and free histidine supplementation (0.5 and 1.0 mol/L) showed that shoot and root growth of C. communis decreased greatly with increasing Cr concentrations in the medium; and that the species was a typical excluder since it accumulated high concentrations of Cr in roots but comparatively low concentrations in shoots. Chromium in shoots and roots of Cr24 -supplied plants ranged from 329-1880 and 3788-4240 mg/kg DW, respectively, while those of Cr24 -histidine-supplied plants ranged from 478 to 629 mg/kg and 4157-4303 mg/kg DW, respectively. With Cr present in the hydroponic solution, C. communis accumulated more Cr in its tissues. Increasing histidine application to the solution significantly increased chromium accumulation in the plant tissues but could not alter the accumulation pattern of plants although it induced a higher concentration of Cr in its shoots and roots. These features suggested that C. communis may serve as an alternative species in a constructed wetland for phytoextraction treatment of Cr-containing wastewater and for phytostabilization of Cr mining spoils. 相似文献
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种子萌发实验、砂培和土培试验结果表明,酸模、小头蓼和戟叶酸模对Cu具有较强的耐性和蓄积能力,在染Cu环境中能正常生长。砂培条件下,这些植物能在7 mg·L-1Cu处理的营养液中生长并蓄积Cu。小头蓼根部含Cu量明显高于酸模和戟叶酸模,前者平均含Cu量为(4765.06±484.28)mg·kg-1, 后两者分别为(1749.23±154.98)mg·kg-1、(890.26±57.21)mg·kg-1;茎叶部含Cu量也以小头蓼较高,平均为(214.04±16.31)mg·k-1,戟叶酸模和酸模较低,分别为(34.59±4.94)mg·kg-1、(27.59±5.32)mg·kg-1。土培试验也证实,酸模和戟叶酸模均能蓄积一定的Cu。据此推测,酸模、小头蓼和戟叶酸模均可作为植物修复铜污染土壤的先锋物种。 相似文献
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