| 胡南,杨照岚,稂涛,祝孔俊,肖芳芳.螯合剂作用下博落回-鸭乸草间作修复铀污染土壤的研究[J].南华大学学报(自然科学版),2024,(6):1~10, 26.[HU Nan,YANG Zhaolan,LANG Tao,ZHU Kongjun,XIAO Fangfang.Phytoremediation of Uranium Contaminated Soils with Intercropping of Macleaya Cordata and Paspalum Scrobiculatum Under Treatment of Chelating Agents[J].Journal of University of South China(Science and Technology),2024,(6):1~10, 26.] |
| 螯合剂作用下博落回-鸭乸草间作修复铀污染土壤的研究 |
| Phytoremediation of Uranium Contaminated Soils with Intercropping of Macleaya Cordata and Paspalum Scrobiculatum Under Treatment of Chelating Agents |
| 投稿时间：2024-04-29 |
| DOI： |
| 中文关键词: 植物修复 铀 螯合剂 间作 |
| 英文关键词:phytoremediation uranium chelating agent intercrop |
| 基金项目:国家自然科学基金项目(12275123);湖南省杰出青年基金项目(2022JJ10041) |
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| 中文摘要: |
| 本文以湖南某铀尾矿库附近的铀污染农田土壤为研究对象,选择博落回(Macleaya Cordata)和鸭乸草(Paspalum Scrobiculatum)作为铀富集植物,通过盆栽试验,研究了螯合剂作用下,博落回-鸭乸草间作时,地上和地下部分的铀富集行为,以及其根际土壤铀的结合形态、有机酸质量浓度和微生物群落结构的变化。结果显示,2 mmol/kg草酸对土壤中可交换态铀的提升效果最好,而低浓度的铁载体对土壤中的铀结合形态无显著影响。与未添加螯合剂的博落回-鸭乸草间作组相比,草酸作用下,博落回-鸭乸草间作的铀富集总量分别显著提高了216.28%和21.04%,且博落回的转移系数显著提高了68.18%。草酸的添加,显著降低了根际土壤草酸质量浓度,这可能与外源草酸参与缓解铀毒性对植物的胁迫有关。根际土壤中Sphingomonas,Gp1,Mortierella和Fusarium等耐铀微生物对铀的吸附和分泌的有机酸缓解了铀毒性对植物的胁迫,促进了根际土壤中的铀向可交换态转换,从而提高了植物对铀的富集。 |
| 英文摘要: |
| The uranium contaminated farmland soil near a uranium tailings pond in Hunan Province was selected as the research object, and Macleaya Cordata and Paspalum Scrobiculatum were selected as uranium bioaccumulation plants. Pot experiments were carried out to study the effects of chelating agents on the behavior of uranium bioaccumulation in the shoot and root parts during the intercrop of Macleaya Cordata and Paspalum Scrobiculatum, as well as its effects on the speciation of uranium, content of organic acid, and composition of microbial communities in the rhizosphere soil. The results showed that 2 mmol/kg oxalic acid has the best effect on enhancing exchangeable uranium in soil, while low concentrations of siderophore have no significant effect on the change of speciation of uranium in soil. The total uranium bioaccumulation in Macleaya Cordata and Paspalum Scrobiculatum increased significantly by 216.28% and 21.04%, respectively, and the translocation factor of Macleaya Cordata increased significantly by 68.18%, by intercropping of Macleaya Cordata and Paspalum Scrobiculatum compared to the intercropping control group. The content of oxalic acid in rhizosphere soil significantly reduced due to the addition of oxalic acid, which might be related to the involvement of exogenous oxalic acid in alleviating the stress of uranium toxicity on plants. The secretion of organic acids by plant root system and the adsorption of uranium by uranium tolerant microorganisms including Sphingomonas, Gp1, Mortierella, and Fusarium in rhizosphere soil alleviated the stress of uranium toxicity on plants, promoted the conversion of uranium to exchangeable uranium in the rhizosphere soil, and promoted uranium bioaccumulation of plants. |
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