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Unravelling the ecological ramifications of biodegradable microplastics in soil environment: A systematic review
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Researchers reviewed 85 studies on biodegradable microplastics in soil, finding that when biodegradable plastics fail to fully break down they can disrupt soil structure, nutrient cycling, and microbial life in ways that depend heavily on concentration and plastic type. The review highlights that "biodegradable" plastics are not a simple fix for microplastic pollution in agricultural soils.
Plastic pollution, especially microplastics (MPs), poses significant environmental challenges, with biodegradable plastics (BPs) often presented as sustainable alternatives. However, incomplete degradation of BPs in soil environment leads to the creation of biodegradable microplastics (BMPs), whose impacts remain inadequately understood. This systematic review synthesizes findings from 85 publications to assess the effects of BMPs on soil ecosystems, encompassing physical, chemical, and biological properties. BMPs influence soil texture, porosity, nutrient cycling, microbial diversity, and plant growth, with varying impacts depending on polymer type, concentration, and soil conditions. While BMPs can enhance soil organic matter and microbial activity at low concentrations, higher concentrations often alter nutrient availability and soil stability. Soil biota shows differential responses to BMPs, with potential implications for nutrient cycling and soil ecosystem functioning. Contradictory research findings underscore the need for long-term, field-based studies under varied environmental conditions. The insights from this review contribute to a deeper understanding of the ecological ramifications of BMPs in soil ecosystems, highlighting critical research gaps, advocating for multidisciplinary approaches to comprehensively evaluate impacts of BMPs.
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Researchers reviewed how biodegradable plastics break down in soil and freshwater, finding that incomplete degradation by microorganisms can still produce tiny biodegradable microplastic particles that persist in the environment — meaning "biodegradable" doesn't always mean safe or fast-disappearing.
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When "biodegradable" is not benign: Microplastic-driven disruption of soil processes and plant-microbe interactions
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Researchers reviewed evidence that biodegradable microplastics persist long enough in soil to meaningfully alter aggregate structure, enzyme activity, and microbial community composition, proposing a mechanistic framework in which polymer chemistry, aging-driven surface changes, and rhizosphere dynamics jointly determine ecological outcomes — and concluding that biodegradability should not be equated with environmental safety.
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