Abstract
The phytoremediation efficiency is largely depends on the bioavailability of heavy metal in soil. The activity of earthworms and oxidation of elemental sulfur (S0) in soil has influence on heavy metal speciation transformation in soil. By conducting pot experiment, we examined the possibility of enhancing phytoextraction efficiency of lead (Pb) in soil by ryegrass (Lolium perenne L.) with application of both S0 and earthworms. Results showed that the addition of S0 decreased soil pH and increased soil CEC, while a slight trend of decrease for soil pH and increase for CEC was found with earthworm application. In soil treated with earthworms, the addition of S0 increased the concentration of DTPA-extractable Pb by 9.9~20.8%. The concentration of diffusive gradients in thin film (DGT)-extractable Pb was increased by 26.31~32.9% with S0 and earthworm addition. In soil treated with earthworms, the addition of S0 increased the concentration of Pb in shoots of ryegrass by 55.7~110.4% and the translocation factor of Pb in ryegrass was also increased by S0 addition. Our results suggested that the combination application of earthworms and S0 could be an effective way to enhance the remediation efficiency of ryegrass for Pb-contaminated soil.
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Funding
This work was supported by the Shanghai Agriculture Applied Technology Development Program, China (2020-02-08-00-12-F01457, G20190301, T20180414), Natural Science Foundation of Shanghai (21ZR1443300), and Excellent Team Program of Shanghai Academy of Agricultural Sciences (Nongkechuang 2017(A-03)).
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Lijuan Sun, Peiyun Gong and Yong Xue designed the experiment, wrote the manuscript. Ke Song and Dechao Duan conducted the soil analysis. Chen Xu helped revised the manuscript. Hong Zhang and Yafei Sun helped analyze all of the data. Qin Qin and Weiguang Lv helped measuring Pb concentration in plant.
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Sun, L., Gong, P., Song, K. et al. Combination application of elemental sulfur and earthworm increased the lead (Pb) uptake by ryegrass (Lolium perenne L.) in contaminated agricultural soil. Environ Sci Pollut Res 29, 23315–23322 (2022). https://doi.org/10.1007/s11356-021-17592-2
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DOI: https://doi.org/10.1007/s11356-021-17592-2