Effect of petroleum hydrocarbon pollution levels on the soil microecosystem and ecological function

IF 7.6 2区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Environmental Pollution Pub Date : 2022-01-15 DOI:10.1016/j.envpol.2021.118511

Huan Gao , Manli Wu , Heng Liu , Yinrui Xu , Zeliang Liu

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引用次数: 40

Abstract

Petroleum hydrocarbon pollution is a global problem. However, the effects of different petroleum pollution levels on soil microbial communities and ecological functions are still not clear. In this study, we analyzed the changes in microbial community structures and carbon and nitrogen transformation functions in oil-contaminated soils at different concentrations by chemical analysis, high-throughput sequencing techniques, cooccurrence networks, and KEGG database comparison functional gene annotation. The results showed that heavy petroleum concentrations (petroleum concentrations greater than 20,000 mg kg⁻¹) significantly decreased soil microbial diversity (p = 0.01), soil microbiome network complexity, species coexistence patterns, and prokaryotic carbon and nitrogen fixation genes. In medium petroleum contamination (petroleum concentrations of between 4000 mg kg⁻¹ and 20,000 mg kg⁻¹), microbial diversity (p > 0.05) and carbon and nitrogen transformation genes showed no evident change but promoted species coexistence patterns. Heavy petroleum contamination increased the Proteobacteria phylum abundance by 3.91%–57.01%, while medium petroleum contamination increased the Actinobacteria phylum abundance by 1.69%–0.26%. The results suggested that petroleum concentrations played a significant role in shifting soil microbial community structures, ecological functions, and species diversities.

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石油烃污染程度对土壤微生态系统及生态功能的影响

石油烃污染是一个全球性问题。然而，不同石油污染水平对土壤微生物群落和生态功能的影响尚不清楚。本研究通过化学分析、高通量测序技术、共发生网络和KEGG数据库比对功能基因注释等方法，分析了不同浓度石油污染土壤中微生物群落结构和碳氮转化功能的变化。结果表明，重质石油浓度(石油浓度大于20000 mg kg−1)显著降低了土壤微生物多样性(p = 0.01)、土壤微生物网络复杂性、物种共存模式和原核碳固氮基因。在中等石油污染(石油浓度在4000 mg kg - 1和20,000 mg kg - 1之间)中，微生物多样性(p >0.05)，碳、氮转化基因无明显变化，但促进了物种共存模式。重度石油污染使变形菌门丰度增加3.91% ~ 57.01%，中度石油污染使放线菌门丰度增加1.69% ~ 0.26%。结果表明，石油浓度对土壤微生物群落结构、生态功能和物种多样性具有重要影响。

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来源期刊

Environmental Pollution 环境科学-环境科学

CiteScore

16.00

自引率

6.70%

发文量

2082

审稿时长

2.9 months

期刊介绍： Environmental Pollution is an international peer-reviewed journal that publishes high-quality research papers and review articles covering all aspects of environmental pollution and its impacts on ecosystems and human health. Subject areas include, but are not limited to: • Sources and occurrences of pollutants that are clearly defined and measured in environmental compartments, food and food-related items, and human bodies; • Interlinks between contaminant exposure and biological, ecological, and human health effects, including those of climate change; • Contaminants of emerging concerns (including but not limited to antibiotic resistant microorganisms or genes, microplastics/nanoplastics, electronic wastes, light, and noise) and/or their biological, ecological, or human health effects; • Laboratory and field studies on the remediation/mitigation of environmental pollution via new techniques and with clear links to biological, ecological, or human health effects; • Modeling of pollution processes, patterns, or trends that is of clear environmental and/or human health interest; • New techniques that measure and examine environmental occurrences, transport, behavior, and effects of pollutants within the environment or the laboratory, provided that they can be clearly used to address problems within regional or global environmental compartments.