冰封期乌梁素海沉积物微生物群落对砷形态的影响

石文静; 徐浩然; 刘轶哲; 李卫平

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中国环境科学 ›› 2025, Vol. 45 ›› Issue (5) : 2724-2734.

环境生态

冰封期乌梁素海沉积物微生物群落对砷形态的影响

石文静, 徐浩然, 刘轶哲, 李卫平

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Effect of microbial community on arsenic speciation in sediments of Wuliangsuhai Lake during the ice-bound period

SHI Wen-jing, XU Hao-ran, LIU Yi-zhe, LI Wei-ping

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摘要

为探究冰封期内蒙古河套盆地湖泊沉积物微生物群落对砷赋存形态的影响,以乌梁素海沉积物为研究对象,利用16S rRNA高通量测序技术,研究了冰封期乌梁素海沉积物微生物群落结构特征,结合RDA、相关性分析和共现性网络分析等方法探讨了冰封期沉积物微生物群落与砷形态的响应关系.结果显示,冰封期乌梁素海沉积物中的砷除残渣态外,强吸附态砷和与AVS (沉积物中能够被酸提取的硫化物)、碳酸盐、锰氧化物及结晶性极差的Fe氢氧化物共沉淀的砷占比较高,冰封期当沉积环境不稳定时乌梁素海沉积物中的砷存在二次释放的风险.冰封期乌梁素海沉积物微生物群落结构多样性较为丰富,微生物群落物种的丰富度和多样性呈现出明显的空间分布特征.冰封期微生物群落与砷形态之间存在显著的共线性关系,其中以硫杆菌属、芽孢杆菌、类固醇杆菌属、脱硫弧菌属和厌氧绳菌属对砷形态的影响最为显著.并且冰封期时吸附态As、与AVS、碳酸盐、锰氧化物及结晶性极差的Fe氢氧化物共沉淀的As和黄铁矿中的As可以相互转化,而硫杆菌属和类固醇杆菌属在这个转化过程中起重要作用.

Abstract

To investigate the influence of microbial communities on arsenic speciation in lake sediments of the Hetao Basin in Inner Mongolia during the ice-bound period, the sediments from Wuliangsuhai (WLSH) were taken as the research object. Using 16SrRNA high-throughput sequencing technology, the structural characteristics of microbial communities in WLSH sediments during the ice-bound period were studied. Additionally, methods such as redundancy analysis (RDA), correlation analysis, and co-occurrence network analysis were employed to explore the response relationship between sediment microbial communities and arsenic speciation during the ice-bound period. The results indicated that, apart from the residual arsenic, strongly adsorbed arsenic and arsenic co-precipitated with AVS(Acid-extractable sulfides in sediment), carbonates, manganese oxides, and poorly crystalline Fe hydroxides accounted for a relatively high proportion in the sediments of WLSH during the ice-bound period. When the sedimentary environment was unstable during the ice-bound period, there was a risk of secondary release of arsenic in the sediments of WLSH. The microbial community in the WLSH sediments during the ice-bound period exhibited abundant diversity, and the richness and diversity of microbial community species showed obvious spatial distribution characteristics. There was a significant collinear relationship between microbial communities and arsenic speciation during the ice-bound period, with Thiobacillus, Bacillus, Steroidobacter, Desulfosarcinaceae, and Anaerolinea exhibiting the most pronounced effects on arsenic speciation. Furthermore, adsorbed As, As co-precipitated with AVS, carbonates, manganese oxides, and poorly crystalline Fe hydroxides, as well as As in pyrite, could mutually transform during the ice-bound period, and Thiobacillus and Steroidobacter played crucial roles in this transformation process. This study aims to explore the impact of microbial communities on arsenic speciation in sediments of WLSH during the ice-bound period, providing a microbial theoretical basis and scientific evidence for lake arsenic pollution control. It provides significant implications for the rational development and utilization of water resources, as well as the protection and restoration of aquatic ecological environments.

导出引用

石文静, 徐浩然, 刘轶哲, 李卫平. 冰封期乌梁素海沉积物微生物群落对砷形态的影响[J]. 中国环境科学. 2025, 45(5): 2724-2734

SHI Wen-jing, XU Hao-ran, LIU Yi-zhe, LI Wei-ping. Effect of microbial community on arsenic speciation in sediments of Wuliangsuhai Lake during the ice-bound period[J]. China Environmental Science. 2025, 45(5): 2724-2734

中图分类号： X524

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