Presence of microplastics alone and co-existence with hydrochar unexpectedly mitigate ammonia volatilization from rice paddy soil and affect structure of soil microbiome
Presence of microplastics alone and co-existence with hydrochar unexpectedly mitigate ammonia volatilization from rice paddy soil and affect structure of soil microbiome
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微塑料的单独存在以及与水炭的共存意外地减轻了稻田土壤中的氨挥发并影响土壤微生物组的结构
DOI：
10.1016/j.jhazmat.2021.126831
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发表时间：
2021-08-13
影响因子：
13.6
通讯作者：
Xing, Baoshan
中科院分区：
文献类型：
--
作者：
Feng, Yuanyuan;Han, Lanfang;Xing, Baoshan
微塑料作为一种新兴污染物，可能会对陆地生态系统的氮循环造成有害影响。然而，MPs的单一影响和MPs与水热炭对稻田氨（NH3）挥发和土壤微生物组的协同效应在很大程度上尚未探索。在这项研究中，聚乙烯（PE），聚丙烯腈（PAN）和秸秆衍生的水热炭（HBC）被选为在整个水稻周期生长期间的观察。结果表明，在0.5%（w/w）的MPs浓度下，MPs单独存在以及MPs与HBC的共存（MPs + HBC）与不添加MPs或HBC的对照相比，均显著降低了稻田土壤中NH3的累积挥发量。MPs + HBC处理使NH3挥发量增加了37.8-46.2%，说明MPs和HBC的共存削弱了MPs对NH3挥发的减缓作用。此外，与NH3挥发密切相关的氮循环相关微生物的结果表明，MP + HBC改变了细菌群落结构和物种多样性。这些研究结果为我们进一步了解多效唑对农业环境和土壤的影响提供了重要的机会，并为合理化HBC在多效唑土壤中的应用提供了良好的理论基础。
Microplastics (MPs), as an emerging pollutant, may cause deleterious changes to the nitrogen cycle in terrestrial ecosystems. However, single impact of MPs and synergistic effects of MPs with hydrochar on ammonia (NH3) volatilization and soil microbiome in paddy fields has been largely unexplored. In this study, polyethylene (PE), polyacrylonitrile (PAN) and straw-derived hydrochar (HBC) were selected for observations in an entire rice cycle growth period. Results showed that under the condition of 0.5% (w/w) MPs concentration, presence of MPs alone and co-existence of MPs and HBC (MPs + HBC) unexpectedly mitigated cumulative NH3 volatilization from paddy soil compared with the control with no MPs or HBC addition. MPs + HBC increased NH3 volatilization by 37.8-46.2% compared with MPs alone, indicating that co-existence of MPs and HBC weaken the mitigation effect of MPs on NH3 volatilization. Additionally, results of nitrogen cycle related microorganisms closely related to NH3 volatilization demonstrated that MPs + HBC altered the bacterial community structure and species diversity. These findings provide an important opportunity to advance our understanding of the impacts of MPs in agricultural environment and soils, and provide a sound theoretical basis for rationalizing the application of HBC in soil with MPs.