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Inhibition of methane production in an alpine wetland of the Tibetan plateau by carbon-based nanomaterials
Summary
Scientists found that tiny carbon particles (like those from carbon nanotubes and activated carbon, which are increasingly ending up in remote environments due to pollution) can significantly reduce methane production—a potent greenhouse gas—in Tibetan Plateau wetlands, by starving the microbes that produce it of nutrients. Interestingly, nanoplastics didn't have this effect, showing that not all nanomaterials impact ecosystems the same way. This matters because it suggests some engineered nanomaterials could unintentionally help curb greenhouse gas emissions from natural wetlands, though more research is needed
Methane (CH) is the second most important greenhouse gas, and alpine wetlands on the Tibetan Plateau are critical natural sources of atmospheric CH. As anthropogenic activities intensify, nanomaterials are increasingly transported into this region through pathways such as atmospheric deposition, yet their impacts on methanogenesis and the underlying mechanisms remain poorly understood. A 160-day microcosm incubation was conducted at 15°C, 25°C, and 35°C to investigate the effects of multi-walled carbon nanotubes (CNTs), activated carbon (AC), nano-FeO (NaFe), and nanoplastics (NaP) on CH production in alpine wetlands on the Tibetan Plateau by integrating analyses of soil physicochemical properties and microbial communities. The effects of nanomaterials differed markedly. CNTs and AC reduced cumulative CH production by 38-82% and 21-25%, respectively, whereas NaFe and NaP showed no significant effects compared with the Control. CNTs and AC decreased soil dissolved organic carbon, total nitrogen, and ammonium contents, thereby decreasing the availability of carbon substrates and nutrients required for methanogenesis and reducing the methanogen abundance. They also enriched microbial taxa that potentially compete with methanogens for substrates and nutrients, further contributing to the inhibition of methanogenesis. These inhibitory effects were temperature-dependent and strongest at 25°C. At this temperature, CNTs and AC reduced CH production by 82% and 25%, respectively, coinciding with the greatest number of differentially enriched microbial taxa. This study provides new insights into the ecological effects of emerging pollutants and informs CH mitigation strategies in alpine wetlands.