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Microplastic pollution threatens mangrove carbon sequestration capacity
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Researchers found that microplastic pollution in mangrove soils is linked to increased methane production potential by favoring methane-producing archaea over methane-consuming bacteria. A nationwide survey of Chinese mangroves revealed higher microplastic concentrations in surface soils, with stronger associations with methane-cycling microorganisms at shallow depths. The findings suggest that plastic pollution could undermine the carbon sequestration capacity of these critical coastal ecosystems, potentially turning them from carbon sinks into greenhouse gas sources.
Microplastics are a pervasive environmental pollutant, altering microbial communities and disrupting global biogeochemical cycles. Mangrove forests, critical blue carbon habitats, are significant sinks for microplastic accumulation, yet they also cycle large amounts of methane, a potent greenhouse gas. The effect of plastic pollution on methane dynamics in these vital habitats remains, however, poorly understood. Here we show that microplastic pollution in mangrove soils is linked to an increased potential for methane production by favouring methanogenic archaea. Through a nationwide survey of Chinese mangroves, we found that microplastic concentrations were higher (6516 ± 1725 particles kg-1) in surface soils (0-20 cm) and exhibited stronger association with methane-cycling microbes (four linkage pathways), compared to concentrations (2246 ± 497 particles kg-1) and two linkage pathways in deeper soils (20-40 cm). Microplastics in topsoil were correlated with more complex microbial networks, consisting of 150 nodes and 237 links, relative to 113 nodes and 196 links in deeper soils. Furthermore, we directly linked elevated microplastic pollution in surface soils to secondary industry output, which positively correlated with the methanogens-to-methanotrophs gene ratio, establishing a clear anthropogenic driver for this shift. These findings reveal a critical, previously unrecognized mechanism by which industrial plastic pollution may compromise the net carbon sequestration capacity of mangrove ecosystems. Mitigating microplastic discharge is therefore not only a waste management issue but is also essential for preserving the climate-regulating function of these crucial habitats amid global conservation efforts.
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Researchers found that microplastics in mangrove sediments host distinct communities of archaea (ancient microorganisms) that differ from those in surrounding sediments, with some species linked to increased methane production. The microbial communities on microplastic surfaces shifted over time and showed increased potential for methane emissions and changes in nitrogen cycling. This suggests that microplastic pollution in coastal wetlands could amplify greenhouse gas production and disrupt nutrient cycles that support these critical ecosystems.
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Researchers found that biodegradable plastic (PLA) microplastics in mangrove soil increased the release of greenhouse gases, especially carbon dioxide and methane, from deeper soil layers. The microplastics altered soil bacterial communities in ways that boosted methane-producing organisms. This finding is important because biodegradable plastics are often marketed as environmentally friendly, but they may still harm ecosystems by accelerating carbon release from soils.
Effects of microplastics on carbon release and microbial community in mangrove soil systems
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Researchers tested how microplastics affect carbon release and microbial life in mangrove soils at different depths. They found that while topsoil was largely unaffected, deeper soil layers released significantly more carbon dioxide when microplastics were present, particularly biodegradable types like polylactic acid. The study suggests that microplastic contamination in mangrove ecosystems could accelerate carbon loss from deeper soils by disrupting microbial communities and worsening nitrogen limitations.
Effect of microplastics on CO2 emission from Yellow River Delta wetland
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Researchers found that microplastic contamination in Yellow River Delta wetland soils altered CO2 emissions, with different polymer types and concentrations producing varying effects on soil carbon dynamics — raising concern that plastic pollution could undermine the carbon sequestration function of coastal wetlands.
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