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<p><UnorderedList Mark="Bullet"> <ItemContent> <p>Nanoparticles inhibit anaerobic decomposition of SOM, with a more severe suppression on CO<sub>2</sub> than CH<sub>4</sub> production.</p> </ItemContent> <ItemContent> <p>The Prolixibacteraceae in anaerobic paddy soils are sensitive to nanoparticles.</p> </ItemContent> <ItemContent> <p>Microbial populations stimulated by nanoparticles probably contribute to the increase of CH<sub>4</sub>/TIC ratio in paddy soils.</p> </ItemContent> </UnorderedList></p><p>Paddy soil is frequently flooded, which leads to anaerobic decomposition of soil organic matter (SOM) to produce CO<sub>2</sub> and CH<sub>4</sub>. Currently, there is limited research about the impact of nanoparticles on anaerobic SOM decomposition and CH<sub>4</sub> production in paddy soil. This study investigates the effects of iron oxide nanoparticles (Fe<sub>3</sub>O<sub>4</sub> NPs) and multi-walled carbon nanotubes (MWCNTs) on anaerobic SOM decomposition in two paddy soils. The findings showed that addition of nanoparticles (Fe<sub>3</sub>O<sub>4</sub> NPs: 0.08% and 0.3%; MWCNTs: 0.05% and 0.2%) reduced methane production by 7.48%–31.72% in Guiyang soil and 3.32%–31.24% in Fuyang soil, with decrease in SOM decomposition of 32.19%–47.87% and 19.60%–33.09%, respectively. However, the CH<sub>4</sub>/TIC (total inorganic carbon) ratio was elevated (by 3.17% to 61.92%) after nanoparticles amendment, suggested that TIC production was more significantly suppressed than CH<sub>4</sub>. The Prolixibacteraceae, which usually involve in organic macromolecule decomposition, decreased in relative abundance with inhibition of CH<sub>4</sub> production by nanoparticles in both soils, suggesting their sensitivity to nanoparticles. In contrast, the relative abundances of many microbial populations increased with the intensified inhibition of soil mineralization by nanoparticles in both soils. Especially, <i>Sedimentibacter</i> and Melioribacterae increased with inhibition of CH<sub>4</sub> by nanoparticles, and Clostridiaceae, <i>Minicystis</i> as well as <i>Rhodomicrobium</i> increased with the CH<sub>4</sub>/TIC ratio in both soils, probably because they might provide substrates for methanogens. These results suggested that nanoparticles not only inhibit the decomposition of SOM but also change the fate of decomposed carbon through modulating microbial populations, leading to a substantial increase in the proportion of CH<sub>4</sub> produced from SOM decomposition.</p>

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Effects of nanoFe3O4 and carbon nanotubes on anaerobic decomposition of soil organic matter in paddy soil

  • 期刊论文

  • 发表日期：

    2025年6月30日

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  • Bi Wang,
  • Qian Wang,
  • Debin Wu,
  • Li Song,
  • Quan Yuan

摘要

Nanoparticles inhibit anaerobic decomposition of SOM, with a more severe suppression on CO2 than CH4 production.

The Prolixibacteraceae in anaerobic paddy soils are sensitive to nanoparticles.

Microbial populations stimulated by nanoparticles probably contribute to the increase of CH4/TIC ratio in paddy soils.

Paddy soil is frequently flooded, which leads to anaerobic decomposition of soil organic matter (SOM) to produce CO2 and CH4. Currently, there is limited research about the impact of nanoparticles on anaerobic SOM decomposition and CH4 production in paddy soil. This study investigates the effects of iron oxide nanoparticles (Fe3O4 NPs) and multi-walled carbon nanotubes (MWCNTs) on anaerobic SOM decomposition in two paddy soils. The findings showed that addition of nanoparticles (Fe3O4 NPs: 0.08% and 0.3%; MWCNTs: 0.05% and 0.2%) reduced methane production by 7.48%–31.72% in Guiyang soil and 3.32%–31.24% in Fuyang soil, with decrease in SOM decomposition of 32.19%–47.87% and 19.60%–33.09%, respectively. However, the CH4/TIC (total inorganic carbon) ratio was elevated (by 3.17% to 61.92%) after nanoparticles amendment, suggested that TIC production was more significantly suppressed than CH4. The Prolixibacteraceae, which usually involve in organic macromolecule decomposition, decreased in relative abundance with inhibition of CH4 production by nanoparticles in both soils, suggesting their sensitivity to nanoparticles. In contrast, the relative abundances of many microbial populations increased with the intensified inhibition of soil mineralization by nanoparticles in both soils. Especially, Sedimentibacter and Melioribacterae increased with inhibition of CH4 by nanoparticles, and Clostridiaceae, Minicystis as well as Rhodomicrobium increased with the CH4/TIC ratio in both soils, probably because they might provide substrates for methanogens. These results suggested that nanoparticles not only inhibit the decomposition of SOM but also change the fate of decomposed carbon through modulating microbial populations, leading to a substantial increase in the proportion of CH4 produced from SOM decomposition.