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• W3141524790 endingPage "108241" @default.
• W3141524790 startingPage "108241" @default.
• W3141524790 abstract "The hydroxyl radical (•OH) is the most powerful reactive oxygen species that plays a critical role in the fate of redox-active substances. Peatlands are carbon-rich ecosystems with highly reduced substances and ubiquitous redox interfaces. However, little is known about the production of •OH during the reoxidation of peatlands under waterlogged conditions. Here, we conduct a set of reoxidation experiments using waterlogged peat soil dominated by various vegetation species and monitored •OH production. The results show that the cumulative concentrations of •OH produced within 24 h upon oxygenation of waterlogged peat samples are 307–840 mmol g−1. The main factors affecting the production of •OH include an acidic environment, abundant reduced dissolved organic matter and Fe(II). In addition, •OH production enhances laccase activity (the largest class of phenol oxidases in the soil) by 7.7% ~ 20.4% and increases soil respiration by 3.17% ~ 23.67% during the reoxidation of the waterlogged peat samples. In addition, the simulation experiments confirm that •OH can promote laccase activity directly by serving as an electron acceptor and indirectly by oxidizing substrates. Both mechanisms are greater than the effect of oxygen (O2) alone on laccase activity. Our results indicate a new induction mechanism for enhancing laccase activity by •OH when subjected to anoxic-oxic interface fluctuations, which is particularly important for carbon cycling in peatlands because it can break the decomposition latch and can further promote soil organic carbon mineralization." @default.
• W3141524790 created "2021-04-13" @default.
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• W3141524790 date "2021-05-01" @default.
• W3141524790 modified "2023-10-17" @default.
• W3141524790 title "Production of hydroxyl radicals following water-level drawdown in peatlands: A new induction mechanism for enhancing laccase activity in carbon cycling" @default.
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• W3141524790 doi "https://doi.org/10.1016/j.soilbio.2021.108241" @default.
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