This study investigated polycyclic aromatic hydrocarbons (PAHs) removal with wheat straw–derived biochar prepared at 500 °C (WS500) in three different petroleum–contaminated soils. Biochar decreased the contents of PAHs, and its effect has been shown to be dependent upon soil type, especially the soil organic matter (SOM). WS500 exhibited strong adsorptive ability towards PAHs in Jingxing (JX) soil, while it enhanced the PAHs removal by adsorption in combination with biodegradation in Luquan (LQ) soil. No significant effect on PAHs removal was observed in WS500–amended Jinzhou (JZ) soil. PAHs with 4 rings were the most impacted by adding biochar. Principal Coordinates Analysis (PCoA) and clustering analysis indicated that microbial community's distribution was more soil type-related than biochar-related. Illumina MiSeq sequencing results revealed that Proteobacteria, Acidobacteria, Actinobacteria and Verrucomicrobia were the most dominant in all the investigated samples, and that most of the strains were Gram–negative. However, at the genus level a large shift in the bacterial community was observed in LQ soil after adding biochar with increased abundance of the potential PAHs degraders. Thus, the current study highlights the potential of SOM in affecting the PAHs biodegradation by biochar, which may be attributed to the impacted sorption behavior of pollutants and selective enrichment of PAHs degraders.

这项研究研究了在三种不同的石油污染土壤中，以麦秸为原料的生物炭在500°C（WS500）下制备的多环芳烃（PAHs）的去除。生物炭减少了PAHs的含量，其作用已显示取决于土壤类型，尤其是土壤有机质（SOM）。WS500在井xing（JX）土壤中显示出对PAHs的强吸附能力，同时在芦泉（LQ）土壤中通过吸附结合生物降解作用增强了对PAHs的去除。在经WS500改良的锦州（JZ）土壤中，未观察到对去除PAHs的显着影响。添加生物炭对具有4个环的PAH的影响最大。主坐标分析（PCoA）和聚类分析表明，微生物群落的分布与土壤类型有关，而不是与生物炭有关。变形菌门，酸杆菌门，放线菌和疣微菌门是最占主导地位的所有调查样本中，并且大多数菌株对革兰阴性。但是，在属水平上，在添加生物炭后，LQ土壤中的细菌群落发生了很大变化，潜在的PAHs降解物的丰度增加了。因此，当前的研究强调了SOM在通过生物炭影响PAHs生物降解方面的潜力，这可能归因于污染物吸附行为的影响和PAHs降解物的选择性富集。