Abstract
Dissolved organic matter (DOM) is a novel Cd-contaminated soils amendment for phytoremediation. However, the phytoremediation efficiency for different DOM doses has been insufficiently investigated. In this study, we investigated the effect of five DOM doses (v/w, 0%, 1%, 2%, 4% and 8%) on the phytoremediation efficiency of cotton in Cd-contaminated soil through pot experiment. The results showed that bioavailable Cd concentrations and organic matter in the soil increased with the increased of DOM dosage. The DOM dose increased the chlorophyll content, photosynthesis, and the total biomass of cotton. In addition, the DOM application increased the Cd content in cotton roots and changed the Cd uptake in cotton shoots, increasing shoot Cd extraction efficiency by 8.53–20%. Simultaneously, soil Cd phytoextraction efficiency significantly increased. Furthermore, applying a 1% DOM dose resulted in safeguarding fibre biomass and maximising the efficiency of shoot extraction. Redundancy analysis showed that the Mn content in leaves is critical for increasing cotton biomass, anti-oxidation competence and phytoremediation efficiency under 1% DOM dose. In conclusion, DOM enhanced cotton remediation in Cd-contaminated soils and applying DOM at 1% was a suitable choice for Cd-contaminated soils.
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This work was supported by the National Natural Science Foundation of China (No. 31660598) and the National Key Research and Development Program of China (2018YFD0200406).
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All authors designed the study. Tao Min, Jie Qing, Yan Wang and Liyang Cheng performed the experiments. Tong Luo and Hao He discussed the data. Sibo Ru and Junhua Li modified some experimental methods.
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Min, T., Luo, T., He, H. et al. Dissolved organic matter–assisted phytoremediation potential of cotton for Cd-contaminated soil: a relationship between dosage and phytoremediation efficiency. Environ Sci Pollut Res 29, 84640–84650 (2022). https://doi.org/10.1007/s11356-022-21485-3
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DOI: https://doi.org/10.1007/s11356-022-21485-3