Selective pressures of heavy metals on microbial community determine microbial functional roles during composting: Sensitive, resistant and actor

微生物 微生物种群生物学 环境化学 化学 环境修复 食品科学 微生物生态学 细菌 微生物学 生物 生态学 污染 遗传学
作者
Xiaomeng Chen,Yue Zhao,Xinyu Zhao,Junqiu Wu,Longji Zhu,Xu Zhang,Zimin Wei,Yan Liu,Pingping He
出处
期刊:Journal of Hazardous Materials [Elsevier]
卷期号:398: 122858-122858 被引量:98
标识
DOI:10.1016/j.jhazmat.2020.122858
摘要

Heavy metals (HM) pollution exerts an effect on microbial community composition and structure during composting, the way how microbial community responses to HM pressure is remain poorly understood though. The aim of this study was to explore functional roles of microorganisms based on selective pressures of HM (Cu, Zn and Cd). The results of microbial resistance showed that the toxicity of metals to microorganisms were Cu > Zn > Cd during composting. Cu and Zn were more toxic for microorganisms during composting when compared with Cd. However, microorganisms had a longer lag period to grow under Zn stress through microbial tolerance determination. In addition, the microbial catalase activity generally decreased and protease activity generally increased, thus microorganisms became more adaptable to HM stress during composting. The experimental results confirmed the existence of sensitive, resistant and actor microorganisms during beef cattle and chicken manures composting. Ultimately, the resistant, sensitive and actor microorganisms at genus level were distinguished under HM pressure based on the network analysis and structural equation models, including 85 resistant microorganisms, 5 sensitive microorganisms and 6 actor microorganisms. This would be helpful to understand the microbial succession process under HM stress and identify functional strains of HM remediation.
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