Effects of different fertilizer treatments on AC electric field–assisted phytoremediation efficiency of Cd-contaminated soil by willow and Sedum
Tóm tắt
Soil heavy metal pollution poses a serious threat to ecological environment safety and human health through the food chain. Using efficient and safe measures to clean up heavy metals in soils is a necessary and urgent task. Phytoremediation is known as a relatively safe method, which also has the defect of slow repair efficiency. We explored the effects of alternating current (AC) electric field (0 and 0.5 V cm−1) and fertilization (no fertilization, inorganic fertilizer, organic fertilizer, and organic–inorganic combination) on phytoremediation efficiency to heavy metal cadmium (Cd) contaminated soil in an interplanting system of willow (Salix SPP) and Sedum (Sedum Alfredii Hance). The results showed that the most substantial promotion effect was observed under AC electric field applied with organic fertilizer. The plant shoot Cd accumulation was increased by 98.99% compared to the control (no AC electric field and no fertilization). The promotion effect was weaker when applied the electric field, compound fertilizer + organic fertilizer, and organic fertilizer, which increased by 44.98%, 43.30%, and 36.97%, respectively, compare to the control. The single application of fertilizer or electric field had a significant effect on the phytoremediation efficiency. There was a significant interaction between AC electric field and fertilizer application. The strongest improvement in plant Cd uptake was observed when the AC electric field was combined with Chinese milk vetch organic fertilizer. These results will provide a very important reference for the application of willow and S. Alfredii in soil Cd remediation.
Tài liệu tham khảo
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