Nitrous oxide inhibition of methanogenesis represents an underappreciated greenhouse gas emission feedback

Author:

Yin Yongchao123,Kara-Murdoch Fadime13,Murdoch Robert W1,Yan Jun4256,Chen Gao17,Xie Yongchao17,Sun Yanchen17,Löffler Frank E12378

Affiliation:

1. Center for Environmental Biotechnology, University of Tennessee , Knoxville, TN 37996 , United States

2. Department of Microbiology, University of Tennessee , Knoxville, TN 37996 , United States

3. Biosciences Division, Oak Ridge National Laboratory , Oak Ridge, TN 37831 , United States

4. Center for Environmental Biotechnology , University of Tennessee, Knoxville, TN 37996 , United States

5. Key Laboratory of Pollution Control and Environmental Engineering , Institute of Applied Ecology, , Shenyang, Liaoning 110016 , China

6. Chinese Academy of Sciences , Institute of Applied Ecology, , Shenyang, Liaoning 110016 , China

7. Department of Civil and Environmental Engineering, University of Tennessee , Knoxville, TN 37996 , United States

8. Department of Biosystems Engineering and Soil Science, University of Tennessee , Knoxville, TN 37996 , United States

Abstract

Abstract Methane (CH4) and nitrous oxide (N2O) are major greenhouse gases that are predominantly generated by microbial activities in anoxic environments. N2O inhibition of methanogenesis has been reported, but comprehensive efforts to obtain kinetic information are lacking. Using the model methanogen Methanosarcina barkeri strain Fusaro and digester sludge-derived methanogenic enrichment cultures, we conducted growth yield and kinetic measurements and showed that micromolar concentrations of N2O suppress the growth of methanogens and CH4 production from major methanogenic substrate classes. Acetoclastic methanogenesis, estimated to account for two-thirds of the annual 1 billion metric tons of biogenic CH4, was most sensitive to N2O, with inhibitory constants (KI) in the range of 18–25 μM, followed by hydrogenotrophic (KI, 60–90 μM) and methylotrophic (KI, 110–130 μM) methanogenesis. Dissolved N2O concentrations exceeding these KI values are not uncommon in managed (i.e. fertilized soils and wastewater treatment plants) and unmanaged ecosystems. Future greenhouse gas emissions remain uncertain, particularly from critical zone environments (e.g. thawing permafrost) with large amounts of stored nitrogenous and carbonaceous materials that are experiencing unprecedented warming. Incorporating relevant feedback effects, such as the significant N2O inhibition on methanogenesis, can refine climate models and improve predictive capabilities.

Funder

Dimensions of Biodiversity Program of the US National Science Foundation

Publisher

Oxford University Press (OUP)

Cited by 1 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Sustained bacterial N2O reduction at acidic pH;Nature Communications;2024-05-15

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