Institute of Economic Crops, Hubei Academy of Agricultural Science, Wuhan, 430064, People's Republic of China.
Vegetable Germplasm Innovation and Genetic Improvement Key Laboratory of Hubei Province, Hubei Academy of Agricultural Science, Wuhan, 430064, People's Republic of China.
Environ Geochem Health. 2023 Jul;45(7):5109-5125. doi: 10.1007/s10653-023-01569-w. Epub 2023 Apr 18.
Cadmium pollution in farmland has become a global environmental problem, threatening ecological security and human health. Biochar is effective in remediation of soil pollution. However, high concentrations of biochar can inhibit plant growth, and low concentrations of biochar have limited mitigation effect on cadmium toxicity. Therefore, the combination of low-concentration biochar and other amendments is a promising approach to alleviate cadmium toxicity in plants and improve the safety of edible parts. In this study, muskmelon was selected as the research object, and different concentrations of α-FeO nanoparticles were used alone or combined with biochar to explore the effects of different treatments on muskmelon plants in cadmium-contaminated soil. The results showed that the combined application of 250 mg/kg α-FeO nanoparticles and biochar had a good effect on the repair of cadmium toxicity in muskmelon plants. Compared with cadmium treatment, its application increased plant height by 32.53%, cadmium transport factor from root to stem decreased by 32.95%, chlorophyll content of muskmelon plants increased by 14.27%, and cadmium content in muskmelon flesh decreased by 18.83%. Moreover, after plant harvest, soil available cadmium content in 250 mg/kg α-FeO nanoparticles and biochar combined treatment decreased by 31.18% compared with cadmium treatment. The results of this study provide an effective reference for the composite application of different exogenous amendments and a feasible idea for soil heavy metal remediation and mitigation of cadmium pollution in farmland.
农田镉污染已成为全球性环境问题，威胁生态安全和人类健康。生物炭在土壤污染修复中效果显著。然而，高浓度的生物炭会抑制植物生长，而低浓度的生物炭对镉毒性的缓解效果有限。因此，将低浓度生物炭与其他改良剂结合使用是缓解植物镉毒性、提高可食用部分安全性的一种有前景的方法。本研究以甜瓜为研究对象，单独或组合使用不同浓度的α-FeO 纳米颗粒，探索不同处理方法对镉污染土壤中甜瓜植株的影响。结果表明，250mg/kgα-FeO 纳米颗粒与生物炭联合应用对修复甜瓜植株镉毒性效果良好。与镉处理相比，其应用使甜瓜植株株高增加 32.53%，镉从根到茎的转运系数降低 32.95%，甜瓜植株的叶绿素含量增加 14.27%，果肉中的镉含量降低 18.83%。此外，植物收获后，250mg/kgα-FeO 纳米颗粒与生物炭联合处理的土壤有效态镉含量比镉处理降低了 31.18%。本研究结果为不同外源改良剂的复合应用提供了有效参考，为农田土壤重金属修复和缓解镉污染提供了可行思路。
