School of Chemical and Biological Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China; Key Laboratory of Extreme Environmental Microbial Resources and Engineering of Gansu Province, Lanzhou 730070, China.
School of Chemical and Biological Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China.
Sci Total Environ. 2021 Jan 15;752:141827. doi: 10.1016/j.scitotenv.2020.141827. Epub 2020 Aug 20.
Northwest China is abundant in iron ore reserves and has become one of the important iron ore mining bases in China. However, the contamination and microbial community structure of iron tailing ponds in Northwest China have not been extensively investigated. In the present study, we characterized the main physicochemical properties, the multiple heavy metal contamination, and the bacterial community structure of the soils surrounding an iron tailing pond in Linze County, Zhangye city, Gansu Province. The tailing-associated soils were barren, exhibiting alkaline pH and low organic matter (OM), total nitrogen (TN) and total potassium (TK) compared with the control areas. There was considerable multiple heavy metal pollution in the iron tailing pond, mainly including lead (Pb), manganese (Mn), arsenic (As), cadmium (Cd), zinc (Zn), iron (Fe) and copper (Cu). Among the 303 identified core operational taxonomic units (OTUs), Actinobacteria, Proteobacteria and Deinococcus-Thermus were predominant at the phylum level, and Blastococcus, Arthrobacter, Marmoricola, Kocuria, Truepera, and Sphingomonadaceae were prevalent at a finer taxonomic level. The bacterial richness and diversity of the tailing samples were significantly lower than those of the reference samples. RDA, VPA and Spearman correlation analyses showed that the soil pH, CEC, OM, TP, TK, Cd, Pb, Ni, Zn, As and Mn had significant effects on the bacterial community composition and distribution. This work profiles the basic features of the soil physicochemical properties, the multiple heavy metal contamination and the bacterial community structure in an iron tailing pond in Northwest China, thereby providing a foundation for the future ecological remediation of the iron tailing environment in the area.
中国西北地区铁矿资源丰富，已成为中国重要的铁矿开采基地之一。然而，中国西北地区铁矿尾矿库的污染和微生物群落结构尚未得到广泛研究。本研究以甘肃省张掖市临泽县某铁矿尾矿库周边土壤为研究对象，分析了尾矿库土壤的主要理化性质、多种重金属污染及细菌群落结构。尾矿相关土壤呈碱性，pH 值高，与对照区相比，有机质（OM）、总氮（TN）和总钾（TK）含量较低。尾矿库存在较为严重的多种重金属污染，主要包括铅（Pb）、锰（Mn）、砷（As）、镉（Cd）、锌（Zn）、铁（Fe）和铜（Cu）。在 303 个鉴定的核心操作分类单元（OTUs）中，厚壁菌门（Actinobacteria）、变形菌门（Proteobacteria）和异常球菌-栖热菌门（Deinococcus-Thermus）为主要优势菌门，芽单胞菌属（Blastococcus）、节杆菌属（Arthrobacter）、泥纹石单胞菌属（Marmoricola）、柯斯氏菌属（Kocuria）、真杆菌属（Truepera）和鞘氨醇单胞菌科（Sphingomonadaceae）为主要优势属。尾矿样本的细菌丰富度和多样性明显低于对照样本。RDA、VPA 和 Spearman 相关性分析表明，土壤 pH 值、CEC、OM、TP、TK、Cd、Pb、Ni、Zn、As 和 Mn 对细菌群落组成和分布有显著影响。本研究为未来该地区铁矿尾矿环境的生态修复提供了基础，详细描述了中国西北地区铁矿尾矿库土壤理化性质、多种重金属污染和细菌群落结构的基本特征。
