Abstract Redox reactions are important for cycling of carbon (C) in soils frequently subject to fluctuations in redox conditions, such as wetland soils, which contribute around one third of the global terrestrial C reservoir. Priming effects (PE), induction of changes in C mineralization due to additions of energy-rich organic carbon (OC) substrates, have been largely ignored during redox transitions in current modelling and experimental efforts for evaluating C cycles. In this study, we investigated the effects of glucose input on the mineralization of soil OC during an anaerobic–aerobic transition. Substantially more soil OC was mineralized under aerobic conditions in samples that received glucose under preceding anaerobic conditions compared to controls that did not receive glucose and to samples that received glucose under aerobic-only conditions. Our results reveal a novel PE by which glucose indirectly primes the mineralization of soil OC by increasing the reductive release of iron oxide-associated OC under anaerobic conditions, followed by a dramatic positive PE when aerobic conditions are reestablished. Inclusion of this novel indirect priming mechanism is crucial for accurately predicting the contribution of atmospheric greenhouse gases from soils experiencing redox fluctuations (e.g., wetlands).

中文翻译：

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厌氧-好氧转变下葡萄糖引发土壤有机碳矿化的意外机制

摘要 氧化还原反应对于经常受氧化还原条件波动影响的土壤中的碳 (C) 循环很重要，例如湿地土壤，约占全球陆地碳储量的三分之一。引发效应 (PE)，由于添加富含能量的有机碳 (OC) 底物引起的 C 矿化变化的诱导，在当前用于评估 C 循环的建模和实验工作中的氧化还原转变期间在很大程度上被忽略了。在这项研究中，我们研究了在厌氧-好氧转变过程中葡萄糖输入对土壤 OC 矿化的影响。与未接受葡萄糖的对照和仅在有氧条件下接受葡萄糖的样品相比，在之前的厌氧条件下接受葡萄糖的样品在有氧条件下矿化了更多的土壤 OC。我们的结果揭示了一种新型 PE，通过该 PE，葡萄糖通过在厌氧条件下增加与氧化铁相关的 OC 的还原释放来间接引发土壤 OC 的矿化，然后在重新建立有氧条件时产生显着的正 PE。包含这种新型间接引发机制对于准确预测来自经历氧化还原波动的土壤（例如湿地）的大气温室气体的贡献至关重要。我们的结果揭示了一种新型 PE，通过该 PE，葡萄糖通过在厌氧条件下增加与氧化铁相关的 OC 的还原释放来间接引发土壤 OC 的矿化，然后在重新建立有氧条件时产生显着的正 PE。包含这种新型间接引发机制对于准确预测来自经历氧化还原波动的土壤（例如湿地）的大气温室气体的贡献至关重要。我们的结果揭示了一种新型 PE，通过该 PE，葡萄糖通过在厌氧条件下增加与氧化铁相关的 OC 的还原释放来间接引发土壤 OC 的矿化，然后在重新建立有氧条件时产生显着的正 PE。包含这种新型间接引发机制对于准确预测来自经历氧化还原波动的土壤（例如湿地）的大气温室气体的贡献至关重要。