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Unveiling the synergistic mechanism of autochthonous fungal bioaugmentation and ammonium nitrogen biostimulation for enhanced phenanthrene degradation in oil-contaminated soils

文献类型： 外文期刊

作者： Dai, Yeliang 1 ; Li, Jibing 1 ; Wang, Shuang 1 ; Cai, Xixi 4 ; Zhao, Xuan 1 ; Cheng, Xianghui 1 ; Huang, Qihui 1 ; Yang, Xiumin 1 ; Luo, Chunling 1 ; Zhang, Gan 1 ;

作者机构： 1.Chinese Acad Sci, State Key Lab Organ Geochem, Guangzhou 510640, Peoples R China

2.Chinese Acad Sci, Guangzhou Inst Geochem, Guangdong Hong Kong Macao Joint Lab Environm Pollu, Hong Kong 510640, Guangdong, Peoples R China

3.Univ Chinese Acad Sci, Beijing 100039, Peoples R China

4.Guangdong Acad Agr Sci, Guangdong Key Lab Ornamental Plant Germplasm Innov, Environm Hort Res Inst, Guangzhou 510640, Peoples R China

5.Jinan Univ, Sch Environm, Guangdong Key Lab Environm Pollut & Hlth, Guangzhou 510632, Peoples R China

关键词： Nitrogen biostimulation; PAHs; Autochthonous fungal bioaugmentation; Degrading microorganism; Stable-isotope-probing

期刊名称：JOURNAL OF HAZARDOUS MATERIALS （ 影响因子：13.6； 五年影响因子：12.7 ）

ISSN： 0304-3894

年卷期： 2024 年 465 卷

页码：

收录情况： SCI

摘要： Autochthonous bioaugmentation and nutrient biostimulation are promising bioremediation methods for poly-cyclic aromatic hydrocarbons (PAHs) in contaminated agricultural soils, but little is known about their combined working mechanism. In this study, a microcosm trial was conducted to explore the combined mechanism of autochthonous fungal bioaugmentation and ammonium nitrogen biostimulation, using DNA stable-isotope-probing (DNA-SIP) and microbial network analysis. Both treatments significantly improved phenanthrene (PHE) removal, with their combined application producing the best results. The microbial community compo-sition was notably altered by all bioremediation treatments, particularly the PHE-degrading bacterial and fungal taxa. Fungal bioaugmentation removed PAHs through extracellular enzyme secretion but reduced soil microbial diversity and ecological stability, while nitrogen biostimulation promoted PAH dissipation by stimulating indigenous soil degrading microbes, including fungi and key bacteria in the soil co-occurrence networks, ensuring the ecological diversity of soil microorganisms. The combination of both approaches proved to be the most effective strategy, maintaining a high degradation efficiency and relatively stable soil biodiversity through the secretion of lignin hydrolytic enzymes by fungi, and stimulating the reproduction of soil native degrading microbes, especially the key degraders in the co-occurrence networks. Our findings provide a fresh perspective of the synergy between fungal bioaugmentation and nitrogen biostimulation, highlighting the potential of this combined bioremediation approach for in situ PAH-contaminated soils.

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