Microbial mechanisms responsible for the variation of soil Cd availability under different pe+pH environments
Microbial mechanisms responsible for the variation of soil Cd availability under different pe+pH environments
复制标题
不同pH环境下土壤Cd有效性变化的微生物机制
DOI：
10.1016/j.ecoenv.2020.111057
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
Wang Duo
中科院分区：
文献类型：
--
作者：
Wang Meng;Chen Shibao;Chen Li;Wang Duo
本研究的目的是探讨潜在的微生物机制与水管理可能会改变土壤镉的有效性在不断变化的pe + pH值环境。研究了好氧（70%MWHC）+溶解氧、好氧、连续淹水和连续淹水+ N2 4种水处理方式对Cd污染土壤的影响。结果表明，与好氧处理相比，缺氧处理能有效降低土壤pe + pH，降低Cd有效性，提高S和Fe有效性。pe + pH的下降富集了一些厌氧微生物，例如Anaerolineaceae和Geobacteraceae中的微生物。相反，其他科，如芽单胞菌科和鞘氨醇单胞菌科，似乎是敏感的生物标志物，对有氧处理。细菌群落结构和网络的相互作用被改变，以加强细菌对不同的PE + pH环境的反应所示的系统发育分子生态网络（pMEN）分析。大多数预测的功能类别，如代谢，细胞运动，和膜运输，受到不同的灌溉制度的影响，所示的功能基因谱分析。这些类别与促进细菌适应当地环境的重要性状有关，改变了土壤pe + pH值。结构方程模型表明，土壤pe + pH值对土壤酶活性、细菌群落结构和功能的差异有显著影响，从而影响土壤Cd有效性和铁硫还原的变化。
The objective of this study was to explore potential microbial mechanisms associated with how water management may alter soil Cd availability under changing pe + pH environments. Four water regimes, aerobic [70% MWHC] + dissolved oxygen, aerobic, continuous flooding, and continuous flooding + N2, were applied to Cd-contaminated soil. The results show that the anoxic treatments were effective in decreasing soil pe + pH and in turn decreased Cd availability and increased soil S and Fe availability relative to those of the aerobic treatments. The decreased pe + pH enriched some anaerobic microorganisms such as those in the familiesAnaerolineaceaeandGeobacteraceae. Conversely, other families, such asGemmatimonadaceaeandSphingomonadaceae, appeared to be sensitive biomarkers that responded to aerobic treatments. Bacterial community structure and network interactions were altered to strengthen bacterial responses to different pe + pH environments as indicated by phylogenetic molecular ecological network (pMEN) analysis. The majority of predicted functional categories, such as metabolism, cell motility, and membrane transport, were affected by different irrigation regimes as indicated by a functional gene profile analysis. The categories were related to important traits that facilitated acclimation of bacteria to their local environment with altered soil pe + pH. Structural equation models revealed that soil pe + pH contributed significantly to soil enzyme activities and differences in bacterial community and function, and consequently, was responsible for the variation of soil Cd availability and iron or sulfur reduction.