Contribution of periphytic biofilm of paddy soils to carbon dioxide fixation and methane emissions

Wang, Sichu, Sun, Pengfei, Zhang, Guangbin, Gray, Neil, Dolfing, Jan, Esquivel-Elizondo, Sofia, Peñuelas, Josep and Wu, Yonghong (2022) Contribution of periphytic biofilm of paddy soils to carbon dioxide fixation and methane emissions. The Innovation, 3 (1). p. 100192. ISSN 2666-6758

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Rice paddies are major contributors to anthropogenic greenhouse gas emissions via methane (CH4) flux. The accurate quantification of CH4 emissions from rice paddies remains problematic, in part due to uncertainties and omissions in the contribution of microbial aggregates on the soil surface to carbon fluxes. Herein, we comprehensively evaluated the contribution of one form of microbial aggregates, periphytic biofilm (PB), to carbon dioxide (CO2) and CH4 emissions from paddies distributed across three climatic zones, and quantified the pathways that drive net CH4 production as well as CO2 fixation. We found that PB accounted for 7.1%–38.5% of CH4 emissions and 7.2%–12.7% of CO2 fixation in the rice paddies. During their growth phase, PB fixed CO2 and increased the redox potential, which promoted aerobic CH4 oxidation. During the decay phase, PB degradation reduced redox potential and increased soil organic carbon availability, which promoted methanogenic microbial community growth and metabolism and increased CH4 emissions. Overall, PB acted as a biotic converter of atmospheric CO2 to CH4, and aggravated carbon emissions by up to 2,318 kg CO2 equiv ha−1 season−1. Our results provide proof-of-concept evidence for the discrimination of the contributions of surface microbial aggregates (i.e., PB) from soil microbes, and a profound foundation for the estimation and simulation of carbon fluxes in a potential novel approach to the mitigation of CH4 emissions by manipulating PB growth.

Item Type: Article
Additional Information: Funding Information: This work was supported by the National Natural Science Foundation of China ( 41825021 , 41961144010 , and 31772396 ), the Natural Science Foundation of Jiangsu Province ( BZ2019015 and BE2020731 ), and the Original Innovation Project of the Chinese Academy of Sciences ( ZDBS-LY-DQC024 ).
Uncontrolled Keywords: carbon fluxes, greenhouse gas emissions, periphytic biofilm, redox potential, rice paddy
Subjects: H100 General Engineering
H800 Chemical, Process and Energy Engineering
Department: Faculties > Engineering and Environment > Mechanical and Construction Engineering
Depositing User: Rachel Branson
Date Deposited: 11 Jan 2022 09:23
Last Modified: 11 Jan 2022 09:30

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