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Updated: Jun 5, 2026

Assessment of Methane and Nitrous Oxide Fluxes from Paddy Field by Means of Static Closed Chambers Maintaining Plants Within Headspace
Published on: September 6, 2018
Soil amendments impact hydroxyl radicals production in paddy soil: Dual roles in methane emissions
Yaling Tang1, Ning Chen2, Fei Peng1
1State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, 211135, PR China; University of Chinese Academy of Sciences, Beijing, 100049, PR China; University of Chinese Academy of Sciences, Nanjing, 211135, PR China.
Abstract:
Hydroxyl radicals (•OH) play a critical role in driving contaminants attenuation and elements cycling (e.g., nitrogen cycling) during redox fluctuations of paddy soil. However, such impacts on methane (CH4) emission have been rarely explored, especially with artificial amendments in paddy soil. Here, we found that amendments, mainly containing CaO and organic matter, significantly affected •OH formation and CH4 emissions in paddy soil. Specifically, low-dosage of soil amendments increased •OH production by 14.9-33.8%, which was mainly ascribed to the enhanced formation and oxidation of Fe(II) in low-crystalline phases and silicates. Besides, •OH exhibited dual effects on CH4 emissions, with source (higher than 701.0 μmol kg-1, theoretical value) or sink (lower than this value) effects highly dependent on the •OH accumulation. Finally, soil amendments increased pH and SOC, which promoted microbial abundance and organic matter (OM) decomposition. These changes enhanced Fe(II) oxidation and •OH production, thereby strengthening CH4 emission. In summary, this study deepens the insights into the soil amendments impacting •OH formation and CH4 emission in paddy soils, and may help elucidate the critical role of •OH in driving carbon cycling in soil redox-fluctuating events.
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