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Low-dose polylactic acid microplastics mitigate methane emissions in ratoon rice systems
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Polylactic acid (PLA) is often promoted as a greener alternative to conventional plastic, but this study finds that even low doses of PLA microplastics in rice paddies can significantly reduce methane emissions from the soil — cutting them by 36% over a full growing season. Importantly, this climate benefit came without harming crop yield, increasing CO2 emissions, or raising grain metal concentrations, suggesting PLA may affect soil chemistry in unexpectedly useful ways. The findings open a new line of research into how biodegradable agricultural plastics might be managed not just as a pollution concern but as a potential tool in low-carbon farming strategies.
Biodegradable plastics are increasingly introduced into agricultural systems, yet their ecosystem-scale climate impacts on methane (CH₄) emissions remain poorly understood. Here, we evaluated the effects of environmentally realistic, low-dose polylactic acid (PLA) microplastics on CH₄ emissions and food safety across a full ratoon rice growing cycle. PLA amendment reduced cumulative methane (CH₄) emissions by 36.4% (8.42 ± 0.54 vs. 5.35 ± 0.27 g m⁻²) without affecting CO₂ exchange, crop productivity, or grain metal(loid) concentrations. Temporal analyses revealed that CH₄ dynamics were primarily governed by crop phenology. Process-based modeling evidence indicated that PLA induced persistent soil redox regulation, suppressing methanogenesis while avoiding the typical trade-off between CH₄ mitigations and heavy-metal risks. Moreover, PLA reduced the apparent temperature sensitivity of CH₄ emissions, suggesting enhanced system stability under heat extremes. These findings identify a previously overlooked pathway linking biodegradable material inputs with ecosystem CH₄ regulation and highlight their potential contribution to carbon-neutral agricultural management.
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Mechanisms Associated with Lower Methane Emissions from Paddy Soil by Aged Polylactic Acid Microplastics
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Researchers found that paddy fields with certain management practices emitted less methane, linking microplastic content and soil microbial community shifts to reduced greenhouse gas output. The study highlights how plastic contamination in agricultural soils can unexpectedly alter the carbon cycle.
Biodegradable and conventional microplastics differentially affected greenhouse gas emissions from a flooded paddy soil: Insight into metagenomic analysis
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Not all plastics behave the same way once they end up in the environment: this study found that "biodegradable" plastic (PLA) actually increased methane emissions from flooded rice fields by over 260%, while conventional plastics (PE, PET) suppressed methane but boosted nitrous oxide, another potent greenhouse gas. This matters because biodegradable plastics are often marketed as the eco-friendly choice, but this research shows they may worsen climate-warming gas emissions from farmland, at least in the short term, a tradeoff worth understanding as these plastics become more common in agriculture.
Effects of biodegradable microplastics and straw addition on soil greenhouse gas emissions
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Researchers tested how biodegradable microplastics made from polylactic acid (PLA) affect greenhouse gas emissions from soil, both with and without added crop straw. They found that high concentrations of PLA microplastics significantly increased carbon dioxide emissions while decreasing nitrous oxide emissions, suggesting that even biodegradable alternatives to conventional plastic mulch films can meaningfully alter soil chemistry and gas cycles.
Unveiling the detrimental effects of polylactic acid microplastics on rice seedlings and soil health
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Researchers found that even biodegradable polylactic acid (PLA) microplastics significantly harmed rice plants at high concentrations, reducing root and shoot weight by roughly half and disrupting photosynthesis, while also altering soil enzyme activity and bacterial communities. These findings challenge the assumption that biodegradable plastics are harmless to agriculture and raise questions about their impact on food crops that humans depend on.
Biodegradable microplastics decreased plant-derived and increased microbial-derived carbon formation in soil: a two-year field trial
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A two-year field experiment compared the effects of conventional (polypropylene) and biodegradable (polylactic acid, PLA) microplastics on soil carbon cycling in agricultural soil. Researchers found that while neither plastic type changed total soil carbon levels, PLA microplastics significantly reduced plant-derived carbon (lignin) by 32% while boosting microbial-derived carbon, suggesting that "biodegradable" plastics still meaningfully alter soil biology and chemistry. This matters because it challenges the assumption that biodegradable plastics are environmentally benign once they break down in farmland.
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