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Effects of polypropylene microplastics on carbon dioxide dynamics in intertidal mangrove sediments
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This study investigated how polypropylene microplastics affect carbon dioxide dynamics in mangrove sediments. Researchers found that microplastic contamination altered organic carbon content and microbial communities, influencing CO2 release patterns differently depending on tidal elevation and microplastic concentration.
Microplastics (MPs) in soil can influence CO dynamics by altering organic carbon (OC) and microbial composition. Nevertheless, the fluctuation of CO response attributed to MPs in mangrove sediments is unclear. This study explores the impact of micro-sized polypropylene (mPP) particles on the carbon dynamics of intertidal mangrove sediments. In the high-tide level sediment, after 28 days, the cumulative CO levels for varying mPP dosages were as follows: 496.86 ± 2.07, 430.38 ± 3.84 and 447.09 ± 1.72 mg kg for 0.1%, 1% and 10% (w/w) mPP, respectively. The CO emissions were found to be increased with a 0.1% (w/w) mPP level and decreased with 1% and 10% (w/w) mPP at high-tide level sediment, suggesting a tide level-specific dose dependence of the CO emission pattern in mangrove sediments. Overall, results indicated that the presence of mPP in mangrove sediments would potentially affect intertidal total CO storage under given experimental conditions.
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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.
Depth-dependent response of soil microbial community and greenhouse gas efflux to polylactic acid microplastics and tidal cycles in a mangrove ecosystem
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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.
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.
Microplastics modify the microbial-mediated carbon metabolism in mangroves
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Researchers exposed mangrove rhizosphere microbial communities to four types of microplastics in microcosm experiments and found that polyamide and PVC microplastics reduced microbial utilization of preferred carbon sources by up to 67%, while polyethylene exposure altered nitrogen-containing carbon metabolism. These disruptions to carbon and nitrogen cycling raise concerns about microplastics impairing the critical carbon sequestration function of mangrove ecosystems.
The impacts of polypropylene microplastics on carbon and nitrogen cycling in coastal wetlands: Field evidence
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Researchers conducted a three-month in-situ field investigation of polypropylene microplastic effects on sediment carbon and nitrogen cycling in both intertidal and supratidal zones of a coastal wetland. They found that high concentrations (2% w/w) of polypropylene microplastics significantly stimulated carbon-degrading enzyme activity, while the effects on total organic carbon and nitrogen cycling showed concentration-dependent variation across wetland zones.
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