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Global Responses of Soil Carbon Dynamics to Microplastic Exposure: A Data Synthesis of Laboratory Studies
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This meta-analysis combined data from 110 studies to understand how microplastics change the way carbon moves through soil. The findings suggest that plastic pollution can disrupt natural soil processes, which may affect soil health and the planet's ability to store carbon.
Microplastics (MPs) contamination presents a significant global environmental challenge, with its potential to influence soil carbon (C) dynamics being a crucial aspect for understanding soil C changes and global C cycling. This meta-analysis synthesizes data from 110 peer-reviewed publications to elucidate the directional, magnitude, and driving effects of MPs exposure on soil C dynamics globally. We evaluated the impacts of MPs characteristics (including type, biodegradability, size, and concentration), soil properties (initial pH and soil organic C [SOC]), and experimental conditions (such as duration and plant presence) on various soil C components. Key findings included the significant promotion of SOC, dissolved organic C, microbial biomass C, and root biomass following MPs addition to soils, while the net photosynthetic rate was reduced. No significant effects were observed on soil respiration and shoot biomass. The study highlights that the MPs concentration, along with other MPs properties and soil attributes, critically influences soil C responses. Our results demonstrate that both the nature of MPs and the soil environment interact to shape the effects on soil C cycling, providing comprehensive insights and guiding strategies for mitigating the environmental impact of MPs.
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This meta-analysis pooled data from 114 studies to understand how microplastics affect soil ecosystems at different concentrations. Higher microplastic levels reduced soil organic matter and microbial activity, suggesting that increasing plastic pollution could degrade the soil that supports our food supply.
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Tiny plastic bits in farm soil are messing with how soil stores carbon and releases CO2, changing soil chemistry in ways that could affect crop growth and soil health long-term. This matters because the food we eat grows in this soil, and disrupted soil health can ripple into food quality and our broader environment, even though direct human health impacts still need more research.
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This meta-analysis pools data from multiple studies to assess whether microplastics in agricultural soil affect greenhouse gas emissions. The findings reveal that the environmental impact of microplastics extends beyond direct toxicity, as they may alter soil microbial activity in ways that contribute to climate change.
Global Meta-Analysis Integrated with Machine Learning Assesses Context-Dependent Microplastic Effects on Soil Microbial Biomass Carbon and Nitrogen
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This meta-analysis pooled data from 90 studies to assess how microplastics in soil affect microbial biomass, which is critical for healthy soil function. The research found that in controlled lab settings, microplastics increased microbial biomass carbon by about 10%, but the effect varied greatly depending on plastic type, size, and soil conditions. These soil-level changes matter because altered microbial activity can affect nutrient cycling in agricultural soils that produce the food people eat.
meta
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This global meta-analysis of 508 observations found that microplastics increase labile soil organic carbon while decreasing stable carbon fractions, creating a critical carbon trade-off that threatens long-term soil carbon storage. Under climate stressors like drought and warming, microplastics further accelerate microbial decomposition, potentially undermining soil's capacity to act as a carbon sink.
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