摘要
以中国广东省云浮市(GD)、安徽省合肥市(AH)和陕西省安康市(SX)3个硫铁矿矿渣为研究对象,系统研究了不同地区硫铁矿矿渣理化性质特征和微生物群落多样性、物种组成及其环境驱动因子.结果显示:不同地区硫铁矿矿渣pH、NAG-pH、重金属全量及有效态含量存在显著差异(P＜0.05),GD硫铁矿矿渣微生物Shannon指数显著高于AH和SX(P＜0.05),不同地区微生物群落组成差异显著(P＜0.05);AH、GD和SX的优势门为变形菌门(Proteobacteria)和放线菌门(Actinomycetota),优势属为罗尔斯通菌属(Ralstonia)、硫化芽孢杆菌属(Sulfobacillus)和钩端螺旋菌属(Leptospirillum),均具有耐酸、耐重金属和铁硫氧化等功能;影响矿渣微生物群落结构和组成的主要环境驱动因子包括年均气温、年均降水量、pH、γ、DTPA-Zn、DTPA-Cr和Cu等.研究结果可为硫铁矿矿渣治理和环境修复提供理论依据.
Abstract
This study investigates the physicochemical properties,microbial community diversity,species composition,and environmental drivers of pyrite tailings from 3 locations:Yunfu City in Guangdong(GD),Hefei City in Anhui(AH),and Ankang City in Shaanxi(SX)in China.Results indicate significant differences(P＜0.05)in pH,NAG-pH,and total and available heavy metal contents among regions.GD pyrite tailings exhibit a significantly higher microbial Shannon index compared to AH and SX(P＜0.05),and distinct microbial community compositions(P＜0.05).Dominant phyla include Proteobacteria and Actinomycetota,while key genera such as Ralstonia,Sulfobacillus,and Leptospirillum demonstrate acid tolerance,heavy metal resistance,and iron-sulfur oxidation.The main environmental drivers influencing microbial community structure and composition include average annual temperature,average annual precipitation,pH,y,DTPA-Zn,DTPA-Cr,and Cu.These findings provide theoretical support for pyrite tailings management and environmental restoration.
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