Hu Juanxin, Liu Bo, Xu Xiaolan, Mao Zhansheng, Ye Zhengqian, Liu Dan, Fang Xianzhi
State Key Laboratory of Subtropical Silviculture, Zhejiang A & F University, Hangzhou, People's Republic of China.
Key Laboratory of Soil Contamination Bioremediation of Zhejiang Province, Zhejiang A & F University, Hangzhou, People's Republic of China.
Environ Technol. 2025 Feb;46(5):761-771. doi: 10.1080/09593330.2024.2368687. Epub 2024 Jul 17.
Phytoremediation enhanced by electric field has been considered a green and low-cost technology for remediating heavy metal-contaminated soils. Soil moisture is a main environmental factor that affects Cd availability in the soil. However, the effects of soil moisture and AC-electric field on the remediation efficiency of willow ( spp.) and interplanted together remain unclear. In the present study, we designed four treatments (60% soil field capacity, 60% soil field capacity + 0.5 V·cm AC, 100% soil field capacity, 100% soil field capacity + 0.5 V·cm AC) to explore the impacts of soil moisture and AC-electric field on soil Cd availability and Cd accumulation in plants. The results showed that the application of an AC-electric field significantly increased soil Cd availability by 20.9% and 10.8% under both 60% and 100% soil field capacity, respectively. Both high water with and without AC-electric field treatments reduced the proportion of acid-extractable and reducible Cd of soil but increased the proportion of residual Cd. Compared with the control, an AC-electric field with 60% soil field capacity significantly enhanced the biomass of shoots by 31.2% and increased Cd accumulation in willow leaves and shoots by 14.6% and 32.3%, respectively. In addition, the biomass production of willow was significantly enhanced but the uptake of Cd by willow was dramatically decreased under an AC-electric field with high water treatment. Therefore, these results suggest that the AC-electric field combined with 60% soil field capacity may be a more promising remediation technique to clean up the Cd-contaminated soil.
电场强化植物修复被认为是一种用于修复重金属污染土壤的绿色低成本技术。土壤湿度是影响土壤中镉有效性的主要环境因素。然而，土壤湿度和交流电场对柳树（品种）及其间作植物修复效率的影响仍不清楚。在本研究中，我们设计了四种处理（60%土壤田间持水量、60%土壤田间持水量 + 0.5 V·cm交流电场、100%土壤田间持水量、100%土壤田间持水量 + 0.5 V·cm交流电场），以探究土壤湿度和交流电场对土壤镉有效性及植物镉积累的影响。结果表明，在60%和100%土壤田间持水量条件下，施加交流电场分别显著提高了土壤镉有效性20.9%和10.8%。无论有无交流电场处理，高水分条件均降低了土壤中酸可提取态和可还原态镉的比例，但增加了残留镉的比例。与对照相比，60%土壤田间持水量并施加交流电场显著提高了柳树地上部生物量31.2%，并使柳树叶片和地上部镉积累量分别增加了14.6%和32.
