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| Screening the suitable plant intercropping model for remediation of mercury-contaminated farmland soil in the southern Jiangsu Province area |
| Received:June 30, 2023 |
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| KeyWord:phytoremediation;intercropping;mercury;hyperaccumulator;farmland soil |
| Author Name | Affiliation | E-mail | | JIAO Longjin | No.3 Brigade of Jiangsu Geology & Mineral Resources Bureau, Zhenjiang 212021, China | | | CHENG Jian | College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China | | | JIANG Demin | No.3 Brigade of Jiangsu Geology & Mineral Resources Bureau, Zhenjiang 212021, China | | | ZHU Jiahui | College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China | | | YANG Qian | College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China | | | XU Shuangyuan | College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China | | | GE Peng | No.3 Brigade of Jiangsu Geology & Mineral Resources Bureau, Zhenjiang 212021, China | | | ZHAN Xinhua | College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China | xhzhan@njau.edu.cn |
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| Abstract: |
| To explore the effects of crops and hyperaccumulators intercropping on remediation of mercury(Hg) contaminated farmland soil with pot experiments, wheat(Triticum aestivum L.), soybean[Glycine max(L.) Merr.] and rape(Brassica napus L.) were used as the subjects, intercropped with the hyperaccumulating plants, wild mugwort(Artemisia lavandulaefolia DC.), leafy spurge(Euphorbia esula L.), and rubus(Rubus corchorifolius L.), to investigate the effects of different interplanting systems on the remediation of Hg-contaminated farmland soil. When intercropping with enriched plants, the Hg concentrations in the roots, stems, leaves, and grains of crops decreased to varying degrees, and the Hg concentrations in the roots had the most pronounced decrease. Intercropping of crops and enriched plants could reduce Hg concentrations in crops. Compared with single cropping of wheat, the intercropping of wild-mugwort/rubus and wheat could increase the aboveground biomass of wheat by 49.37% and 42.45%, respectively. The plant transfer factors(TF) of Hg in enriched plants in wheat/wild mugwort and wheat/rubus were similar. However, the Hg bioconcentration factor(BCF) of wild mugwort was substantially higher than that of rubus, with a ratio of 2.59 times. Under the two intercropping modes of soybean, the TF and BCF values of leafy spurge were higher than those of wild mugwort, with ratios of 1.41 times and 1.50 times, respectively. Under the two intercropping modes of rape, the TF values of rubus and wild mugwort were similar. The results of this study displayed that wild mugwort was suitable for intercropping with wheat, and leafy spurge was suitable for intercropping with soybean. In summary, the intercropping patterns of wheat/wild mugwort and soybean/leafy spurge can reduce Hg concentrations in crops and increase wheat and soybean yield to a certain extent. The results can provide not only a scientific theoretical basis for the sustainable utilization of Hg-contaminated farmland soil in the southern Jiangsu area and the safe production of agricultural products, but also technical support for phytoremediation of Hg-contaminated farmland soil. |
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