Qian Ling, Lin Hai, Li Bing, Dong Yingbo
School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing, 100083, China; Sino-Japan Friendship Center for Environmental Protection, Beijing, 100029, China.
School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing, 100083, China; Beijing Key Laboratory on Resource-Oriented Treatment of Industrial Pollutants, Beijing, 100083, China.
Chemosphere. 2023 Apr;320:138052. doi: 10.1016/j.chemosphere.2023.138052. Epub 2023 Feb 3.
Amendment-assisted soilless revegetation is a promissing ecological restoration method of mine tailings because of its eco-friendliness and low-cost. However, it is difficult to establish the plant community during ecological restoration because of its nutrient deficiency and heavy metal toxicity. In this study, the complex amendment, consisting of 1% peat, 1% sludge and 4% bentonite, was used to assist tall fescue to revegetate gold mine tailings. The variation in physicochemical characteristics and microbial community diversity and composition of rhizosphere tailings were investigated. The complex amendments significantly promoted tall fescue growth with an increase of 35.33% in shoot length and 27.19% in fresh weight. The improved plant growth was attributed to the reduction in heavy metal accumulation and the variation in the characteristics of rhizosphere tailing microecology. The heavy metal concentrations in plant tissues were decreased by 27.71-53.44% in the amended groups. Compared with the control, the available nitrogen (N), phosphorus (P) and potassium (K) levels in TA (without plant cultivation) and TPA (with plant cultivation) were also enhanced by 36.67-49.09% and 42.21-71.47%, respectively. Besides, the amendments introduced more exclusive operational taxonomic units (OTU) and increased the relative abundance of ecologically beneficial microbes in the rhizosphere. Overall, this study provides insight into amendment-assisted soilless revegetation and its effects on microecology to expand ecological restoration of gold mine tailings.
改良剂辅助无土植被恢复是一种很有前景的尾矿生态修复方法，因为它具有生态友好和低成本的特点。然而，由于尾矿缺乏养分和存在重金属毒性，在生态修复过程中很难建立植物群落。在本研究中，使用由1%泥炭、1%污泥和4%膨润土组成的复合改良剂来辅助高羊茅在金矿尾矿上进行植被恢复。研究了根际尾矿理化特性、微生物群落多样性和组成的变化。复合改良剂显著促进了高羊茅的生长，地上部长度增加了35.33%，鲜重增加了27.19%。植物生长的改善归因于重金属积累的减少和根际尾矿微生态特征的变化。改良组植物组织中的重金属浓度降低了27.71-53.44%。与对照相比，TA（未种植植物）和TPA（种植植物）中有效氮（N）、磷（P）和钾（K）水平也分别提高了36.67-49.09%和42.21-71.47%。此外，改良剂引入了更多独特的可操作分类单元（OTU），并增加了根际中生态有益微生物的相对丰度。总体而言，本研究为改良剂辅助无土植被恢复及其对微生态的影响提供了见解，以扩大金矿尾矿的生态修复。
