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Beyond counting: a perspective on advancing soil microplastic monitoring in terrestrial ecosystems for risk assessment
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Scientists know a lot about microplastic pollution in oceans and rivers, but far less about how much is in our soil, which matters because that's where our food grows. This review paper argues that simply counting plastic particles in dirt isn't enough; researchers also need to study what chemicals these plastics carry, what germs might hitch a ride on them, and how their size and shape affect the risks they pose before we can truly understand the danger to ecosystems and, ultimately, to us.
Plastic pollution has become a central concern for researchers, policymakers, and the public, particularly in light of the negotiations for the Global Plastics Treaty in Geneva in 2025. Over the past two decades extensive research has greatly improved our understanding of the severity of microplastic pollution through occurrence and impact studies. Recently, the focus has shifted from quantifying plastic abundance toward assessing the potential risks and impacts of microplastics on environmental, animal, and human health. Compared to marine, estuarine, and freshwater ecosystems, research on terrestrial ecosystems remains limited. The scarcity of monitoring data makes it hard to assess the current and future ecological risk of microplastic pollution. This lack of data, largely due to methodological challenges, introduces considerable uncertainty in evaluating the effects of microplastics on the environment. Regardless of the studied ecosystem, assessing microplastic risk is inherently complex. A single plastic polymer may contain hundreds of chemical additives (e.g. plasticizers, pigments), adsorb additional pollutants (e.g. pesticides), and even act as a vector for pathogenic organisms. Furthermore, potential effects depend not only on concentration but also on the polymer type, particle size distribution, and morphology. In this reflection paper, we examine these challenges and propose pathways toward more objective microplastic risk assessments.
More Papers Like This
Soil Microplastic Pollution Across Terrestrial Ecosystems: A Review of Sources, Distribution Patterns, Polymer Types and Environmental Implications
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Tiny plastic bits from things like farm mulch, car tires, and trash are building up in soil everywhere—farms, cities, and even forests—and the smallest pieces can sink deep into the ground where they're more likely to be taken up by plants and soil organisms. This matters for us because these plastics can enter the food we grow, and this review (a summary of many existing studies) shows scientists still don't fully understand the long-term health and environmental risks, meaning better plastic recycling and management are urgently needed.
Global concentrations of microplastic in soils, a review
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Tiny plastic particles called microplastics are showing up in soils around the world, and this study rounds up existing research to see how much is out there, especially in farmland. This matters because soil is where our food grows, so understanding microplastic buildup there is an important step toward figuring out if it could end up in our meals and affect our health. Note that this paper mainly organizes what scientists already know rather than presenting brand-new findings.
Analysis of microplastics risk assessment research worldwide in the soil ecosystem: a scientometric review
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This review pulls together years of scientific research on how tiny plastic particles (microplastics) build up in soil, affecting everything from crops we eat to the microbes that keep soil healthy, and how that pollution could eventually affect human health. The big takeaway: while scientists agree microplastics in soil are a growing concern, the tools used to measure just how risky they are still vary widely and aren't standardized, meaning we don't yet have a clear, consistent picture of the actual danger. This matters because until researchers agree on better measurement methods, it's hard to know how worried we should really be about microplastics in our food and environment.
Microplastics in soils: A review of methods, occurrence, fate, transport, ecological and environmental risks
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This review examines the sources, detection methods, and environmental behavior of microplastics in soils, an area that has received far less attention than marine microplastic pollution. Researchers found that microplastics interact with soil properties and organisms in complex ways, potentially entering the human food chain. The study calls for standardized methods and more research into how these tiny plastic particles move through and affect terrestrial ecosystems.
Soils in distress: The impacts and ecological risks of (micro)plastic pollution in the terrestrial environment
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This review examines how microplastics affect soil ecosystems, including their transport into soils, changes they undergo in the environment, and their interactions with soil organisms. The effects depend heavily on the type, shape, size, and amount of plastic particles present. Understanding these impacts is important because soil contamination with microplastics can affect food production and ultimately human exposure through the food chain.
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When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.