Tire Wear Particles Exposure Enhances Denitrification in Soil by Enriching Labile DOM and Shaping the Microbial Community

IF 10.8 1区 环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL 环境科学与技术 Pub Date : 2024-12-26 DOI:10.1021/acs.est.4c09766
Zhijun Wei, Xiaofang Ma, Yanchao Chai, Mehmet Senbayram, Xiaomin Wang, Meng Wu, Guangbin Zhang, Shujie Cai, Jing Ma, Hua Xu, Roland Bol, Matthias C. Rillig, Rong Ji, Xiaoyuan Yan, Jun Shan
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Abstract

Tire wear particles (TWP) are emerging contaminants in the soil environment due to their widespread occurrence and potential threat to soil health. However, their impacts on soil biogeochemical processes remain unclear. Here, we investigated the effects of TWP at various doses and their leachate on soil respiration and denitrification using a robotized continuous-flow incubation system in upland soil. Fourier transform ion cyclotron resonance mass spectrometry and high-throughput sequencing were employed to elucidate the mechanisms underpinning the TWP effects. We show that TWP increased soil CO2, N2, and N2O emissions, which were attributed to the changes in content and composition of soil dissolved organic matter (DOM) induced by TWP and their leachate. Specifically, the labile DOM components (H/C ≥ 1.5 and transformation >10), which were crucial in shaping the denitrifying community, were significantly enriched by TWP exposure. Furthermore, the abundances of denitrification genes (nirK/S and nosZ-I) and the specific denitrifying genera Pseudomonas were increased following TWP exposure. Our findings provide new insights into impacts of TWP on carbon and nitrogen cycling in soil, highlighting that TWP exposure may exacerbate greenhouse gas emissions and fertilizer N loss, posing adverse effects on soil fertility in peri-urban areas and climate change mitigation.

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轮胎磨损颗粒暴露通过富集易失性DOM和塑造微生物群落增强土壤反硝化作用
轮胎磨损颗粒(TWP)广泛存在于土壤环境中,对土壤健康具有潜在的威胁,是土壤环境中的新兴污染物。然而,它们对土壤生物地球化学过程的影响尚不清楚。在这里,我们研究了不同剂量的TWP及其渗滤液对陆地土壤呼吸和反硝化的影响,采用机器人连续流培养系统。采用傅里叶变换离子回旋共振质谱和高通量测序来阐明TWP效应的机制。研究表明,TWP增加了土壤CO2、N2和N2O的排放,这是由于TWP及其渗出液引起的土壤溶解有机质(DOM)含量和组成的变化。其中,对反硝化群落形成至关重要的不稳定DOM组分(H/C≥1.5和transformation >;10)因TWP暴露而显著富集。此外,暴露于TWP后,反硝化基因(nirK/S和nosz - 1)和特定反硝化属假单胞菌的丰度增加。我们的研究结果为TWP对土壤碳氮循环的影响提供了新的见解,强调TWP暴露可能加剧温室气体排放和肥料N损失,对城郊地区土壤肥力和减缓气候变化产生不利影响。
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来源期刊
环境科学与技术
环境科学与技术 环境科学-工程:环境
CiteScore
17.50
自引率
9.60%
发文量
12359
审稿时长
2.8 months
期刊介绍: Environmental Science & Technology (ES&T) is a co-sponsored academic and technical magazine by the Hubei Provincial Environmental Protection Bureau and the Hubei Provincial Academy of Environmental Sciences. Environmental Science & Technology (ES&T) holds the status of Chinese core journals, scientific papers source journals of China, Chinese Science Citation Database source journals, and Chinese Academic Journal Comprehensive Evaluation Database source journals. This publication focuses on the academic field of environmental protection, featuring articles related to environmental protection and technical advancements.
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