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Appropriate human intervention stimulates the development of microbial communities and soil formation at a long-term weathered bauxite residue disposal area
Journal of Hazardous Materials ( IF 13.6 ) Pub Date : 2020-11-27 , DOI: 10.1016/j.jhazmat.2020.124689
Wenshun Ke , Xianchao Zhang , Feng Zhu , Hao Wu , Yifan Zhang , Yan Shi , William Hartley , Shengguo Xue

Bauxite residue discharged to disposal areas, which could generate environmental pollution issues. Long-term natural restoration may improve the physicochemical properties of the residues, in turn supporting vegetation establishment, and effectively managing pollution. Nevertheless, the effects of short-term human intervention on soil formation in the weathered disposal areas are still relatively unknown. Thus, residue samples with different depths from different regions including no vegetation, sparse vegetation, complete vegetation coverage, and complete vegetation coverage following sewage sludge treatment were selected to analyze microbial community using Illumina high-throughput sequencing technology and evaluate soil formation process. Long-term weathering changed pH, the fraction of water-stable aggregates and nutrient concentrations, whilst promoting Proteobacteria, Chloroflexi, Acidobacteria and Planctomycete populations. Sewage sludge addition enhanced aggregate stability and significantly changed microbial community diversity. Sewage sludge application enriched the relative abundances of Proteobacteria and Bacteroidetes, whilst decreasing the relative abundance of Acidobacteria, which may be due to variation in environmental factors. Canonical correspondence analysis revealed that pH and EC were the main factors affecting microbial structure, followed by organic carbon content and aggregate stability. The results enhance the understanding of soil formation in bauxite residue and reveal the potential benefit of human intervention in ecological reconstruction at disposal areas.



中文翻译:

适当的人为干预可以促进长期风化的铝土矿残留物处置区微生物群落的发展和土壤形成。

铝土矿残留物排放到处置区,可能产生环境污染问题。长期的自然恢复可改善残留物的理化特性,进而支持植被的建立并有效地管理污染。然而,短期的人为干预对风化处置区土壤形成的影响仍然相对未知。因此,选择了来自不同地区,包括无植被,稀疏植被,完全植被覆盖和污水污泥处理后完全植被覆盖的不同深度的残留样品,以使用Illumina高通量测序技术分析微生物群落并评估土壤形成过程。长期风化改变了pH值,水稳定聚集体的比例和养分浓度,同时促进Proteobacteria,Chloroflexi,Acidobacteria和Planctomycete种群。污水污泥的添加增强了集料的稳定性并显着改变了微生物群落的多样性。污水污泥的施用丰富了变形杆菌和拟杆菌的相对丰度,同时降低了酸性细菌的相对丰度,这可能是由于环境因素的变化所致。典型的对应分析表明,pH和EC是影响微生物结构的主要因素,其次是有机碳含量和聚集体稳定性。研究结果加深了对铝土矿残渣中土壤形成的了解,并揭示了人为干预处置区生态重建的潜在益处。污水污泥的添加增强了集料的稳定性并显着改变了微生物群落的多样性。污水污泥的施用丰富了变形杆菌和拟杆菌的相对丰度,同时降低了酸性细菌的相对丰度,这可能是由于环境因素的变化所致。典型的对应分析表明,pH和EC是影响微生物结构的主要因素,其次是有机碳含量和聚集体稳定性。研究结果加深了对铝土矿残渣中土壤形成的了解,并揭示了人为干预处置区生态重建的潜在益处。污水污泥的添加增强了集料的稳定性并显着改变了微生物群落的多样性。污水污泥的施用丰富了变形杆菌和拟杆菌的相对丰度,同时降低了酸性细菌的相对丰度,这可能是由于环境因素的变化所致。典型的对应分析表明,pH和EC是影响微生物结构的主要因素,其次是有机碳含量和聚集体稳定性。研究结果加深了对铝土矿残渣中土壤形成的了解,并揭示了人为干预处置区生态重建的潜在益处。同时降低了酸性细菌的相对丰度,这可能是由于环境因素的变化所致。典型的对应分析表明,pH和EC是影响微生物结构的主要因素,其次是有机碳含量和聚集体稳定性。研究结果加深了对铝土矿残渣中土壤形成的了解,并揭示了人为干预处置区生态重建的潜在益处。同时降低了酸性细菌的相对丰度,这可能是由于环境因素的变化所致。典型的对应分析表明,pH和EC是影响微生物结构的主要因素,其次是有机碳含量和聚集体稳定性。研究结果加深了对铝土矿残渣中土壤形成的了解,并揭示了人为干预处置区生态重建的潜在益处。

更新日期:2020-12-02
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