Biodegradable plastic mulch disrupts soil microbes as it breaks down
Liu Y, Liu H, Zhang W, Ning Z, Gao W
Soil Health
The compostable plastic mulch marketed as an eco-friendly alternative to plastic sheeting can throw off the soil microbes that break down organic matter and cycle nutrients, meaning your garden beds might need different feeding strategies depending on how long that mulch has been in the ground.
Farmers and gardeners increasingly use biodegradable plastic film instead of regular plastic to warm soil and block weeds, assuming it just disappears harmlessly. This research found that as the film breaks down, it changes which soil microbes thrive and how they eat, first speeding up their carbon-processing activity and then slowing it down while cutting off their access to nitrogen-rich food sources. In other words, even 'eco-friendly' plastic mulch leaves a lasting fingerprint on the invisible microbial workforce that keeps soil healthy.
Key Findings
Chloroflexi and Actinobacteria bacteria acted as keystone taxa, responding to PBAT dosage in a non-monotonic (up-then-down) pattern
PBAT increased soil carbon-cycling enzyme activity but suppressed most nitrogen-cycling enzymes except urease
Microbial carbon-source utilization (AWCD) rose early in degradation but dropped below control levels in later stages, with reduced use of nitrogen-containing carbon sources
chevron_right Technical Summary
Biodegradable plastic mulch film (PBAT) breaks down in tropical red soil and changes how soil microbes work, boosting carbon-cycling activity at first but slowing it down and choking off nitrogen use over time.
Abstract Preview
Original paper
New insights into effect of PBAT microplastics on latosol microbial metabolic functions.
This study systematically investigated the underexplored effects of poly(butylene adipate-co-terephthalate) (PBAT) microplastics on latosol microbial metabolic fnctions by integrating a Biolog Eco ...
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Mulching is the practice of applying a protective layer of organic or inorganic material to the soil surface around plants. It plays a significant role in plant science by modulating soil moisture retention, temperature regulation, and nutrient cycling, all of which directly influence plant growth
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