YUNNAN CHIHONG Zn & Ge CO, Ltd., Qujing, China.
College of Resources and Environment, Yangtze University, Wuhan, China.
PLoS One. 2024 Jun 14;19(6):e0304689. doi: 10.1371/journal.pone.0304689. eCollection 2024.
To explore cost-effective and efficient phytoremediation strategies, this study investigated the distinct roles of earthworm activity and mucus in enhancing Cd phytoextraction from soils contaminated by Festuca arundinacea, focusing on the comparative advantages of selective leaf harvesting versus traditional whole-plant harvesting methods. Our study employed a horticultural trial to explore how earthworm activity and mucus affect Festuca arundinacea' s Cd phytoremediation in soils using control, earthworm, and mucus treatments to examine their respective effects on plant growth and Cd distribution. Earthworm activity increased the dry weight of leaves by 13.5% and significantly increased the dry weights of declining and senescent leaves, surpassing that of the control by more than 40%. Earthworm mucus had a similar, albeit less pronounced, effect on plant growth than earthworm activity. This study not only validated the significant role of earthworm activity in enhancing Cd phytoextraction by Festuca arundinacea, with earthworm activity leading to over 85% of Cd being allocated to senescent tissues that comprise only approximately 20% of the plant biomass, but also highlighted a sustainable and cost-effective approach to phytoremediation by emphasizing selective leaf harvesting supported by earthworm activity. By demonstrating that earthworm mucus alone can redistribute Cd with less efficiency compared to live earthworms, our findings offer practical insights into optimizing phytoremediation strategies and underscore the need for further research into the synergistic effects of biological agents in soil remediation processes.
为了探索具有成本效益和高效的植物修复策略，本研究探讨了蚯蚓活动和黏液在增强受羊茅草污染土壤中镉植物提取方面的不同作用，重点比较了选择性叶片收获与传统整株植物收获方法的优势。本研究采用园艺试验，通过对照、蚯蚓和黏液处理来研究蚯蚓活动和黏液如何影响羊茅草在土壤中的镉植物修复，以考察它们对植物生长和镉分布的各自影响。蚯蚓活动使叶片干重增加了 13.5%，并显著增加了衰退和衰老叶片的干重，比对照组高出 40%以上。蚯蚓黏液对植物生长的影响与蚯蚓活动相似，但程度较轻。本研究不仅验证了蚯蚓活动在增强羊茅草镉植物提取方面的重要作用，蚯蚓活动导致超过 85%的镉分配到仅占植物生物量约 20%的衰老组织中，而且还强调了通过强调蚯蚓活动支持的选择性叶片收获实现可持续且具有成本效益的植物修复方法。通过证明与活蚯蚓相比，蚯蚓黏液单独重新分配镉的效率较低，我们的研究结果为优化植物修复策略提供了实际见解，并强调需要进一步研究生物剂在土壤修复过程中的协同作用。
