期刊
SOIL BIOLOGY & BIOCHEMISTRY
卷 163, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.soilbio.2021.108446
关键词
Biochar; Dissimilatory iron reduction; Methanogenesis; Electron transfer pathways; Conductive-particle interspecies electron; transfer
类别
资金
- China Scholarship Council Foundation [201606510018]
- German Research Foundation (Deutsche For-schungsgemeinschaft
- DFG) [326028733]
- Institutional Strategy of the University of Tubingen (German Research Foundation
- DFG) [ZUK 63]
- Collaborative Research Center 1253 CAMPOS (German Research Foundation
- DFG) [SFB 1253/1 2017]
- Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany's Excellence Strategy, cluster of Excellence EXC2124 [390838134]
- state of Baden-Wurttemberg through bwHPC
- German Research Foundation (DFG) [INST 37/935-1 FUGG]
- Alexander von Humboldt Foundation
Biochar can participate in biogeochemical electron transfer processes due to its electron-accepting and donating capabilities (i.e., geobattery) and electron conductivity (i.e., geoconductor). These two functions were separately demonstrated to play a role in biogeochemical iron cycling and methane formation. Little is known about the coupled effect of both electron transfer mechanisms, even though naturally occurring electron transfer through biochar is expected to simultaneously rely on both geobattery and geoconductor mechanisms.
Biochar can participate in biogeochemical electron transfer processes due to its electron-accepting and donating capabilities (i.e., geobattery) and electron conductivity (i.e., geoconductor). These two functions were separately demonstrated to play a role in biogeochemical iron cycling and methane formation. Yet, little is known about the coupled effect of both electron transfer mechanisms, even though naturally occurring electron transfer through biochar is expected to simultaneously rely on both geobattery and geoconductor mechanisms. Here, we incubated an anoxic paddy soil enrichment culture with acetate as the substrate to investigate how biochar's coupled electron transfer mechanisms influence the electron transfer pathways between microbes and Fe(III) minerals and how it impacts the soil microbial community composition. We found that biochar simultaneously stimulated microbial Fe(III) reduction and methanogenesis by 2.6 and 2.3 fold, but these processes were spatially decoupled. Small biochar particles (5-20 mu m) caused higher Fe(III) reduction and methanogenesis rates than large particles (50-100 mu m). The addition of biochar enriched a syntrophic acetate-oxidizing co-culture with dominating Fe(III)reducing Geobacteraceae taxa and acetoclastic methanogenic Methanosarcina taxa. After acetoclastic methanogenesis stopped, the observed continuing methanogenesis was likely due to interspecies electron transfer caused by biochar functioning as a geoconductor transferring electrons from Geobacteraceae to Methanosarcina. In summary, the simultaneous occurrence of Fe(III) reduction and methanogenesis leads to the formation of a cellbiochar-mineral battery network and a cell-biochar-cell conductive network in an enrichment culture from a paddy soil.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据