Effects of floating-bed planting on the retention of heavy metals by emergent hydrophytes

doi:10.3969/j.issn.1000-5641.2023.03.004

Abstract

Abstract:

In this study, the effects of floating-bed planting on the retention characteristics of heavy metals by emergent hydrophytes in Jinze of Shanghai was studied. A series of sampling sites were set up in the reservoir at the bankside and the floating bed area, respectively.Cyperus alternifolius, Canna indica, andIris tectorum were selected as the representative emergent hydrophyte species to analyze the effects of floating-bed planting on the retention of Cu, Zn, Fe, Cr, Cd, and Pb in plants. The results showed that the biomass of C. indica and I. tectorum that were planted on the floating bed was significantly higher than those planted on the bankside (p < 0.05), while the biomass of C. alternifolius planted on the floating bed was significantly lower than those that were planted on the bankside (p < 0.05). The Cu, Fe, and Pb contents of C. indica planted on the floating bed, moreover, were significantly higher than those that were planted on the bankside (p < 0.05). The Cu, Zn, and Cd contents of C. alternifolius and I. tectorum planted on the floating bed were significantly higher than those that were planted on the bankside (p < 0.05). The retention of Cu, Fe, Cd, and Pb by C. indica; Cu, Zn, Fe, Cd, and Pb by I. tectorum; and Cd by C. alternifolius planted on the floating bed was significantly higher than those that were planted on the bankside (p < 0.05). In summary, correlations between the retention of different heavy metals for the same hydrophyte varied under different planting conditions; these differences were also observed among different species. Above all, it was shown that floating-bed planting can improve the growth and heavy metal absorption capacity of emergent hydrophytes to a certain extent, which has an important effect on the corresponding retention characteristic of heavy metals. Based on the results of our research, it is recommended that C. indica and I. tectorum would be preferred as floating bed plants. For the purpose of long-term monitoring, further systematic and comprehensive studies should be carried out in the future.

Key words: floating-bed planting, emergent hydrophytes, heavy metals, retention characteristics

CLC Number:

Sicheng HUANG, Chunfu TONG, Yiping ZHU. Effects of floating-bed planting on the retention of heavy metals by emergent hydrophytes[J]. Journal of East China Normal University(Natural Science), 2023, 2023(3): 33-42.

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重金属元素	Cu	Zn	Cr	Fe	Cd	Pb
Cu	1.000
Zn	0.820** (0.600)	1.000
Cr	0.658* (0.800)	0.688* (0.800)	1.000
Fe	0.629* (0.783)	0.825 (1.000)	0.961** (0.800)	1.000
Cd	0.621* (–0.977**)	0.603* (–0.600)	0.549 (–0.800)	0.660* (–0.600)	1.000
Pb	0.932** (–0.800)	0.932** (–0.800)	0.842** (–0.600)	0.797** (–0.800)	0.647* (0.800)	1.000

重金属元素	Cu	Zn	Cr	Fe	Cd	Pb
Cu	1.000
Zn	0.957* (0.924**)	1.000
Cr	0.995 (0.841)	0.900* (0.842**)	1.000
Fe	0.987 (0.817)	0.900* (0.782**)	0.993 (0.992)	1.000
Cd	–0.209 (0.810**)	–0.297 (0.867**)	–0.158 (0.916**)	–0.255 (0.914**)	1.000
Pb	–0.041 (0.964**)	–0.243 (0.975**)	–0.009 (0.693*)	–0.101 (0.669*)	0.842 (0.638*)	1.000

重金属元素	Cu	Zn	Cr	Fe	Cd	Pb
Cu	1.000
Zn	0.964* (0.700)	1.000
Cr	0.535 (0.900*)	0.719 (0.742)	1.000
Fe	0.132 (0.968**)	0.330 (0.700)	0.882 (0.910*)	1.000
Cd	0.662 (0.891*)	0.712 (0.867)	0.818 (0.968**)	0.739 (0.900*)	1.000
Pb	0.732 (0.900*)	0.874 (0.900*)	0.966* (0.777)	0.740 (0.900*)	0.836 (0.800)	1.000

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