When "biodegradable" is not benign: Microplastic-driven disruption of soil processes and plant-microbe interactions.
Pelko T, Jemec Kokalj A, Regvar M, Dermastia M, Vogel-Mikuš K
Soil Health
The 'biodegradable' mulch films and compostable bags you use in your garden may be leaving behind microscopic plastic particles that quietly sabotage the soil microbes your vegetable roots need to absorb nutrients.
Scientists reviewed evidence showing that 'biodegradable' plastics don't vanish harmlessly — they crumble into microscopic bits that linger in soil and interfere with the tiny organisms that keep plants fed and healthy. These plastic fragments change how soil clumps together, how water moves through it, and how nutrients are recycled, stressing plant roots from the outside in. The damage to plants ranges from barely noticeable slowdowns in growth to serious stunting, and scientists warn we're likely underestimating the long-term harm.
Key Findings
Biodegradable microplastics persist in soil long enough to measurably alter pH, enzyme activity, and carbon and nutrient cycling — contradicting the assumption that they pose low ecological risk.
BMP surfaces act as dynamic microbial habitats that shift soil community composition and, under certain conditions, may facilitate pollutant transport, pathogen persistence, and horizontal gene transfer between microbes.
Plant responses to biodegradable microplastics span a wide spectrum — from subtle metabolic changes to pronounced growth inhibition — driven primarily by indirect, rhizosphere-mediated effects rather than direct toxicity.
chevron_right Technical Summary
Biodegradable plastics break into tiny particles that linger in soil far longer than assumed, disrupting the microbial communities and chemical processes that plant roots depend on. A new review proposes a mechanistic framework showing these particles can alter soil structure, shift microbial communities, and impair plant growth through cascading, interconnected pathways.
Abstract Preview
The increasing use of biodegradable plastics (BPs) as alternatives to conventional plastics (CPs) is leading to the accumulation of biodegradable microplastics (BMPs) in terrestrial environments. C...
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