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www.sciencedirect.com/science/arti...7651320310848

Hai Lin, Xinyi Jiang, Bing Li, Yingbo Dong, Ling Qian,
Soilless revegetation: An efficient means of improving physicochemical properties and reshaping microbial communities of high-salty gold mine tailings,
Ecotoxicology and Environmental Safety, https://doi.org/10.1016/j.ecoenv.2020.111246.
(https://www.sciencedirect.com/science/article/pii/S0147651320310848)
Abstract: Soilless revegetation is a cost-effective and eco-friendly method for the ecological restoration of gold mine tailings. However, due to gold mine tailings are high-salty, alkaline and low-nutrient, little research has been done on soilless revegetation of gold mine tailings. The aim of study was to apply soilless revegetation to gold mine tailings, and investigate the changes of physicochemical properties and microbial communities of tailings after soilless revegetation. Six selected herbaceous plants (Melilotus officinalis, Xanthium sibiricum, Festuca elata, Zoysia japonica, Amaranthus tricolor L., Artemisia desertorum) grew well on the bare tailings, and their heights reached as high as 16.28 cm after 90 days. After soilless revegetation, tailings salinity dramatically dropped from 547.15 to 129.24 μS cm−1, and pH went down from 8.68 to 7.59 at most. The content of available phosphorus (AP), available nitrogen (AN) and organic matter (OM) in tailings gradually improved, especially the content of AP and OM increased 53.36% and 52.58%, respectively. Furthermore, microbial metabolic activity and diversity in tailings obviously increased 70.33–264.70% and 1.64–13.97% respectively. The relative abundance of potential plant growth-promoting bacteria increased 1.40–3.05%, while the relative abundance of opportunistic pathogens and halophilic bacteria decreased 10.58–17.03% and 2.98–6.52% respectively. Such variations of microbial communities were beneficial for tailings restoration. This study provided insight into soilless revegetation and its impact on tailings microorganisms, which could be a new strategy for ecological restoration of gold mine tailings.

Keywords: Soilless revegetation; Gold mine tailings; Physicochemical properties; Microbial metabolic activity; Microbial community structure