Phytoextraction of metal(loid)s from contaminated soils by six plant species: A field study
| Autor: | Kehui Liu, Fangming Yu, Xingwei Shi, Yi Li, Xing Liang, Yizong Huang, Tang Shuting |
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| Rok vydání: | 2021 |
| Předmět: |
Rhizosphere
Environmental Engineering Biology biology.organism_classification Pollution Phytoremediation Soil Biodegradation Environmental Agronomy Microbial population biology Helianthus annuus Soil water Bidens pilosa Shoot Environmental Chemistry Soil Pollutants Hyperaccumulator Waste Management and Disposal Cadmium |
| Zdroj: | The Science of the total environment. 804 |
| ISSN: | 1879-1026 |
| Popis: | Phytoextraction is an in situ remediation technique that uses (hyper)accumulator plant species to extract metal(loid)s from contaminated soils. Field studies can help in selecting appropriate plants for phytoextraction and in better understanding their phytoextraction performance. Hence, a field study was conducted using six (hyper)accumulator species (Solanum nigrum L., Bidens pilosa L., Xanthium strumarium L., Helianthus annuus L., Lonicera japonica T. and Pennisetum sinese R.) over two years in Jiaoxi town, Liuyang city, Hunan Province, China, to determine the effect of the (hyper)accumulator rhizospheres on field soils contaminated with multiple metal(loid)s and to analyze the variations in rhizosphere soil microbial community diversity and composition. After two years of field experiments, compared to the other four (hyper)accumulators, Bidens pilosa L. and Xanthium strumarium L. exhibited not only better metal(loid) phytoextraction abilities but also higher shoot biomasses. The contents of diethylenetriaminepentaacetic acid (DTPA)-extractable Pb, Cd and Zn decreased in the rhizosphere soils of all six (hyper)accumulators after repeated phytoextraction. Moreover, our findings illustrated that hyperaccumulator planting helps improve and rebuild the soil bacterial community composition and structure in contaminated soils by shifting the soil physiochemical properties. After repeated planting, the soil bacterial communities were reconstructed and dominated by Proteobacteria, Actinobacteriota, Chloroflexi and Acidobacteriota at the phylum level. The soil fungal communities were dominated by Ascomycota, Basidiomycota and Mortierellomycota at the phylum level. The reconstruction of soil microbial communities may help (hyper)accumulators adapt to metal(loid)-contaminated environments and improve their phytoextraction abilities. |
| Databáze: | OpenAIRE |
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