From Microbes to Molecules: Biodegradable Microplastics Reshape Soil Carbon Metabolism and Composition of Dissolved Organic Matter.
Hu X, Han L, Ochoa-Hueso R, Song J, Yang X
Soil Health
Those biodegradable plastic mulch films and plant pots breaking down in your garden beds may be quietly destabilizing the living soil community that feeds your plants — more so than the conventional plastic you've been trying to avoid.
Scientists discovered that the tiny fragments left behind when 'biodegradable' plastics break down in soil actually shake up the community of bacteria and viruses living there more than regular plastic fragments do. This disruption changes how soil organisms process and store carbon — the stuff that makes soil fertile and spongy. The microbes and viruses start working together in ways that speed up the breakdown of organic matter, which could affect how well soil holds nutrients over time.
Key Findings
Biodegradable microplastics caused significantly greater disruption to microbial carbon-cycling genes — including aerobic respiration, carbon fixation, and fermentation pathways — than conventional microplastics.
Biodegradable microplastics uniquely enriched specific microbial and viral communities that co-regulated key metabolic pathways, activating a 'viral shuttle' mechanism that accelerated turnover of dissolved organic matter.
The effects on soil carbon composition were modulated by fertilization regimes, with biodegradable microplastics driving enhanced accumulation of both labile (readily available) and recalcitrant (long-lasting) carbon components.
chevron_right Technical Summary
Biodegradable microplastics — the kind marketed as eco-friendly — disrupt soil microbial communities and carbon cycling more severely than conventional plastics, accelerating the breakdown and turnover of soil organic matter through interactions between bacteria and viruses.
Abstract Preview
Microplastics (MPs) are ubiquitous in the environment, yet how conventional MPs (CMPs) and biodegradable MPs (BMPs) alter microbial carbon (C) metabolism and dissolved organic matter (DOM) remains ...
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