Yang Yuewei, Yang Side, Sun Jialu, Zhang Yun, Yu Xin, Li Penghui, Zhang Xiaolin, Li Xiaojing
School of Environmental Science and Safety Engineering, Tianjin University of Technology, Tianjin, 300384, PR China; Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs / Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, MARA / Tianjin Key Laboratory of Agro-Environment and Agro-Product Safety, Tianjin, 300191, PR China.
Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs / Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, MARA / Tianjin Key Laboratory of Agro-Environment and Agro-Product Safety, Tianjin, 300191, PR China.
J Environ Manage. 2025 Feb;374:124044. doi: 10.1016/j.jenvman.2025.124044. Epub 2025 Jan 10.
As an accelerated electron transfer device, the influence of microbial electrochemical snorkel (MES) on soil greenhouse gas production remains unclear. Electron transport is the key to methane production and denitrification. We found that the NO amount of the MES treatment was comparable to the control however the cumulative CO and CH emissions were reduced by 50% and 41%, respectively. The content of Fe in MES treatment increased by 31%, which promoted the electron competition of iron reduction to methanogenesis. Furthermore, the competition among iron-reducing, nitrifying and denitrifying bacteria reduced the abundance of methanogens by 19-20%. Additionally, the MES treatment decreased the abundance of genes associated with hydrogen methanogenesis pathway by 6-19%, and inhibited the further conversion of acetyl-CoA into CH for acetoclastic methanogenesis. This study reveals effects of accelerating electron transfer on greenhouse gas emission, and provides a novel strategy for reducing greenhouse gas emissions in paddy soil.
作为一种加速电子转移装置，微生物电化学通气管（MES）对土壤温室气体产生的影响尚不清楚。电子传递是甲烷产生和反硝化作用的关键。我们发现，MES处理的NO量与对照相当，但累积的CO和CH排放分别减少了50%和41%。MES处理中Fe的含量增加了31%，这促进了铁还原与甲烷生成之间的电子竞争。此外，铁还原菌、硝化细菌和反硝化细菌之间的竞争使产甲烷菌的丰度降低了19%至20%。此外，MES处理使与氢甲烷生成途径相关的基因丰度降低了6%至19%，并抑制了乙酰辅酶A进一步转化为用于乙酸裂解产甲烷的CH。本研究揭示了加速电子转移对温室气体排放的影响，并为减少稻田土壤中的温室气体排放提供了一种新策略。
