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A Double‐Edged Sword of Biodegradable Microplastics on the Soil Microbial Carbon Pump
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Researchers found that biodegradable microplastics in soil had a double-edged effect: they increased carbon dioxide emissions (contributing to greenhouse gases) but also boosted the efficiency of soil microbes at storing carbon in stable forms. This suggests microplastic pollution in farmland has complex environmental consequences that go beyond simple contamination, potentially affecting both climate change and long-term soil health.
Understanding how microplastic pollution alters soil microbial communities and their influence on soil carbon processes is crucial to elucidating the associated pollutant-climate change feedback. However, previous studies have mainly focused on the effects of microplastics on soil carbon loss, and whether and how microplastics mediate microbial anabolism and subsequent contributions to soil carbon are largely unexplored. Here, we evaluated how conventional and biodegradable microplastic exposure simultaneously affects carbon mineralization and the accumulation of microbial necromass carbon in two types of soil with distinct nutrient levels. We found that biodegradable microplastics significantly increased soil CO2 emissions, likely due to the resulting greater resource availability and increased microbial activity. By contrast, biodegradable microplastics increased microbial carbon use efficiency and promoted microbial community turnover, further increasing the accumulation of microbial necromass in mineral-associated organic matter and bulk soil carbon. Additionally, the microplastic-induced increase in soil CO2 emissions and necromass carbon accrual was more apparent in infertile soil. Jointly, our results highlight the dual roles of microplastics on soil carbon release and stabilization.
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Disentangling microplastics effects on soil structure, microbial activity and greenhouse gas emissions
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Researchers studied how microplastics affect soil structure, microbial activity, and greenhouse gas emissions, finding complex interactions that depend on microplastic type and concentration. The presence of microplastics in soils can alter the biological processes that regulate carbon storage and nutrient cycling.
Microplastics Generate Less Mineral Protection of Soil Carbon and More CO2 Emissions
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Researchers investigated how dissolved organic matter released from microplastics affects soil carbon storage compared to natural organic matter. They found that microplastic-derived compounds are nearly eight times more easily consumed by soil microbes, leading to significantly higher carbon dioxide emissions and much less carbon being stored in soil minerals. The findings suggest that microplastic pollution in agricultural and natural soils may undermine the land's ability to store carbon and contribute to climate warming.
[Effects of Microplastics and their Properties on Soil Organic Carbon Fractions: A Meta-analysis].
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Scientists analyzed nearly 850 soil samples from studies worldwide and found that microplastics in soil actually boost the amount of carbon stored there, particularly in a stable, long-lasting form. While this sounds like good news for fighting climate change, it's a double-edged sword: the same plastic pollution building up in our soil also raises concerns about contamination of the food we grow and the water we drink, since microplastics don't just disappear—they accumulate in the environment we depend on for our health.
Effect of microplastics on carbon, nitrogen and phosphorus cycle in farmland soil: A meta-analysis
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This meta-analysis of 102 studies found that microplastics in farmland soil increased soil organic carbon, microbial biomass carbon, and microbial biomass nitrogen, but also elevated CO2, methane, and nitrous oxide emissions through enhanced carbon mineralization and denitrification. Microplastic biodegradability, size, concentration, and soil properties all drove these effects, suggesting agricultural microplastic pollution may worsen greenhouse gas emissions from farmland.
Effects of microplastics on soil carbon dioxide emissions and the microbial functional genes involved in organic carbon decomposition in agricultural soil
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Researchers studied how polyethylene microplastics in agricultural soil affect carbon dioxide emissions and the microbial genes responsible for breaking down organic matter. They found that aged microplastics boosted soil carbon dioxide output and shifted the abundance of genes involved in decomposing starch, cellulose, and other carbon compounds. The findings suggest that microplastic accumulation in farmland may alter soil carbon cycling in ways that could influence greenhouse gas emissions.
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