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Microplastics in Soil: Uncovering Their Hidden Chemical Implications
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This review of over 100 studies examines how microplastics affect soil health, finding they can disrupt nutrient cycling, alter soil acidity, change microbial communities, and act as carriers for heavy metals and pesticides. The effects vary widely depending on the type of plastic, particle shape, and environmental conditions, with some plastics depleting nitrogen and phosphorus while others temporarily boost nutrient retention. The findings underscore that microplastic contamination in agricultural soils could have far-reaching consequences for food production and ecosystem health.
This review synthesizes findings from over 100 recent studies to examine the multifaceted impacts of microplastics on soil health. Microplastics affect soil nutrient dynamics through mechanisms such as chemical leaching, nutrient adsorption, microbial shifts, and physical alterations in soil structure. Their influence varies by polymer type, particle morphology, concentration, and environmental conditions. While some microplastics may enhance nutrient retention, many contribute to nitrogen and phosphorus depletion, undermining soil fertility and agricultural productivity. Microplastics also modify soil pH in inconsistent ways, either increasing or decreasing it, thereby disrupting nutrient availability and microbial functions. The effects of microplastics on soil organic matter are equally complex. Biodegradable microplastics can stimulate microbial respiration and increase dissolved organic carbon, but they may also destabilize carbon pools, depending on the environmental context and soil conditions. Additionally, microplastics act as vectors or sinks for organic pollutants and heavy metals through diverse sorption–desorption mechanisms. Their interactions with contaminants such as pesticides, pharmaceuticals, and metals like lead, cadmium, and zinc are influenced by polymer type, surface aging, and coexisting soil constituents. Microplastics not only impair nutrient cycling but also alter microbial community composition, enzymatic activity, and pollutant degradation, raising concerns about the function of soil ecosystems and food safety. Future research should prioritize long-term, multi-factorial experiments under realistic environmental conditions. Key areas include disentangling the effects of conventional versus biodegradable microplastics, developing mechanistic models of pollutant interactions, and assessing the role of environmental parameters in mediating metal binding. Such efforts are vital for accurate risk assessments and informed mitigation strategies in terrestrial ecosystems.
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Effects of microplastics on soil properties: Current knowledge and future perspectives
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This review examines how microplastics affect soil health, including changes to soil structure, chemistry, and the microbial communities that keep soil fertile. The effects vary depending on the type, shape, and amount of plastic present, but in many cases microplastics alter nutrient availability and can even influence greenhouse gas emissions from soil. These changes could threaten crop productivity and food safety, since microplastics are now found in agricultural soils worldwide.
Microplastics as an Emerging Environmental Pollutant in Agricultural Soils: Effects on Ecosystems and Human Health
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This review examines how microplastics enter and move through agricultural soil ecosystems, affecting soil properties, nutrient cycling, and the organisms that live in and depend on healthy soil. Researchers found that microplastics can alter key biogeochemical processes and interact with co-existing pollutants like heavy metals and pesticides, potentially compounding their harmful effects. The study highlights the need for prevention and control strategies as microplastic contamination of farmland becomes an increasingly recognized environmental and potential human health concern.
Effects of microplastics on soil physical, chemical and biological properties
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This review examines how microplastics affect soil health, covering their impact on the physical structure, chemical composition, and biological communities of soil ecosystems. Microplastics can alter soil water retention, change nutrient cycling, and harm soil organisms from earthworms to microbes. Since agricultural soils are a major reservoir of microplastics, these changes could affect crop growth and food quality, creating an indirect pathway for microplastic-related harm to human health.
Soil health responses to microplastic contamination in agroecosystems: A comprehensive review
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This review pulls together existing research showing that farm soils actually contain far more microplastics than oceans do, and these tiny plastic bits harm soil quality by disrupting helpful bacteria, hurting earthworms, and reducing nutrients crops need. Microplastics can also carry toxic chemicals and metals into the food we eat, making this a hidden risk to both food supply and human health that needs more attention.
Effects of microplastics on soil microorganisms and microbial functions in nutrients and carbon cycling – A review
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This review examines how microplastics in soil alter the communities of bacteria and fungi that are essential for recycling nutrients like nitrogen, phosphorus, and carbon. Microplastics can increase certain beneficial bacteria but decrease others that are important for soil fertility, and they also carry toxic chemicals that further disrupt microbial life. The authors note that most studies are short-term lab experiments, and long-term field studies are needed to understand real-world impacts.
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