We can't find the internet
Attempting to reconnect
Something went wrong!
Hang in there while we get back on track
Biodegradable microplastics aggravate greenhouse gas emissions from urban lake sediments more severely than conventional microplastics
AI summary Read the abstract
This study found that biodegradable microplastics caused urban lake sediments to release significantly more greenhouse gases (methane and carbon dioxide) than conventional non-biodegradable microplastics. The biodegradable plastics stimulated microbial activity and enzyme production in the sediment, suggesting that switching to biodegradable plastics may have unintended climate consequences if they end up in waterways.
Freshwater ecosystems, such as urban lake sediments, have been identified as important sources of greenhouse gases (GHGs) to the atmosphere, as well as persistent sinks for ubiquitous microplastics due to the high population density and frequent anthropogenic activity. The potential impacts of microplastics on GHG production, however, remain underexplored. In this study, four types of common biodegradable microplastics (BMPs) versus four conventional non-biodegradable microplastics (NBMPs) were artificially exposed to urban lake sediments to investigate the responses of nitrous oxide (NO) and methane (CH) production, and make a comparison regarding how the biodegradability of microplastics affected GHG emissions. Importantly, results suggested that BMPs aggravated NO and CH production in urban lake sediments more severely than conventional NBMPs. The production rates of NO and CH increased by 48.78-71.88 % and 30.87-69.12 %, respectively, in BMPs groups, while those increased by only 0-25.69 % and 6.46-10.46 % with NBMPs exposure. Moreover, BMPs insignificantly affected nitrification but facilitated denitrification, while NBMPs inhibited both processes. BMPs not only created more oxygen-limited microenvironment, greatly promoting NO production via nitrifier denitrification pathway, but also provided dissolved organic carbon favoring heterotrophic denitrification, which was primarily supported by the enriched denitrifiers and functional genes. In contrast, NBMPs slightly upregulated nitrifier denitrification pathway to generate NO, and showed a toxic inhibition on both nitrifiers and denitrifiers. In addition, both BMPs and NBMPs promoted hydrogen-dependent methanogenic pathway but suppressed acetate-dependent pathway. The greater enhancement of CH production with BMPs exposure was attributed to the additional organic carbon substrates derived from BMPs and the stimulated microbial methane metabolism activities.
More Papers Like This
Impacts and mechanism of biodegradable microplastics on lake sediment properties, bacterial dynamics, and greenhouse gasses emissions
AI summary Read the abstract
Researchers found that biodegradable PBAT microplastics in lake sediments increased greenhouse gas emissions more than conventional polyethylene microplastics, altering sediment properties and microbial communities in ways that enhanced carbon dioxide and methane production.
Microplastics promote methane emission in estuarine and coastal wetlands
AI summary Read the abstract
This study found that microplastics in coastal and estuarine wetlands increase methane emissions by boosting the activity of methane-producing microorganisms while reducing methane-consuming ones. Both conventional and biodegradable plastics had this effect, meaning microplastic pollution is not just a direct health concern but also contributes to climate change by amplifying greenhouse gas release from natural ecosystems.
Differential effects of conventional and biodegradable microplastics on carbon and nitrogen transformation and greenhouse gas emissions in Cd-contaminated riparian sediments: Responses of microbial community structure
AI summary Read the abstract
"Biodegradable" plastics — often marketed as the eco-friendly choice — may actually make toxic cadmium pollution worse in river sediments, according to new research. In lab experiments, these plastics made cadmium more available to living things, disrupted helpful bacteria, and boosted emissions of greenhouse gases like CO2 and methane more than regular plastics did. This suggests that the shift toward "biodegradable" plastics isn't automatically better for the environment, and could indirectly affect human health through contaminated waterways, the food chain, and worsening climate impacts.
Divergent Shifts in Sediment Dissolved Organic Matter Stability and Microbial Carbon Metabolic Potential Induced by Biodegradable and Conventional Microplastics
AI summary Read the abstract
"Biodegradable" plastics are often marketed as eco-friendly, but this study found they still disrupt sediment ecosystems, changing the chemistry of organic matter and shifting microbial communities much like conventional plastics do. This matters because these microbial and chemical changes could affect water quality and nutrient cycling, showing that swapping to biodegradable plastics isn't automatically safer for the environment.
Comparative effects of conventional and biodegradable microplastics on greenhouse gas emissions from Loess Plateau orchard soils
AI summary Read the abstract
Scientists found that "biodegradable" plastic bits in orchard soil actually caused a bigger short-term spike in greenhouse gas emissions than regular plastic pollution, by changing soil microbes. This suggests eco-friendly plastics may trade one problem (long-lasting waste) for another (climate impact), a tradeoff worth understanding as biodegradable plastics become more common in farming.
Research digests by email
When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.