We can't find the internet
Attempting to reconnect
Something went wrong!
Hang in there while we get back on track
The impact of biodegradable microplastics on soil aggregate stability across different afforestation ages and soil depths in poplar shelterbelts
AI summary Read the abstract
A field study in poplar shelterbelts found that biodegradable PLA and PBAT microplastics from agricultural films reduced soil aggregate stability, with effects varying by afforestation age and soil depth, suggesting biodegradable plastics still pose risks to soil structure in forestry systems.
Soil aggregates play a critical role in maintaining the ecological stability of forest ecosystems. Due to the widespread application of biodegradable plastics in farmland, the soil of shelterbelts planted on abandoned farmland may become a site for the accumulation of biodegradable microplastics (BMPs). BMPs may present ecological risks to shelterbelt ecosystems by influencing the stability of soil aggregates across various afforestation ages and soil depths. However, this potential impact remains insufficiently investigated. Herein, a 60-day incubation experiment was conducted to investigate the effects of BMPs (polyhydroxyalkanoates (PHA) and polylactic acid (PLA)) on aggregate size distribution, aggregate-associated carbon, and aggregate stability across various afforestation ages (0, 5, 10, 15, and 20 years) and soil depths (0-20, 20-40, 40-60, 60-80, and 80-100 cm). The results indicated that PHA led to a decrease in the microaggregate content (4.94-22.22%), while increasing the macroaggregate content (43.64-1167.04%) and the geometric mean diameter (GMD) of soil aggregates (7.39-49.05%) across all soil samples. Generally, PLA reduced the content of microaggregates (1.95-7.61%) while increasing that of macroaggregates (28.47-216.75%) and the GMD (10.23-29.07%) in the soils of 0-year-old shelterbelts. Furthermore, the extent of improvement in GMD (ΔGMD) and structural stability index (SSI) (ΔSSI) induced by PHA exhibited a positive correlation with increasing soil depth (P < 0.05). Since neither PHA nor PLA reduced the stability of soil aggregates across all afforestation ages and soil depths, the BMPs pose no ecological risk to shelterbelts based on soil aggregates in the short term.
More Papers Like This
Data from: The impact of biodegradable microplastics on soil priming effects in poplar shelterbelts across an afforestation gradient
AI summary Read the abstract
"Biodegradable" plastics, often used in farming, are marketed as an eco-friendly alternative to regular plastic, but this study found that as they break down in tree-planted soils, they can actually cause soil to release more stored carbon into the air—especially in forests planted 10-15 years ago. This matters because these soils are meant to act as carbon storage that helps fight climate change, and losing that stored carbon could undercut the environmental benefits these tree plantings were designed to provide.
Microplastic incorporation into soil aggregates: Insights from two-year field experiments in European agricultural topsoils
AI summary Read the abstract
Researchers conducted two-year field experiments in European agricultural topsoils comparing microplastic incorporation into soil aggregates from biodegradable and conventional plastic mulch films, finding that soil properties and MP size and shape influence the degree of occlusion, with aggregate embedment potentially protecting MPs from further degradation.
Effects of the oversized microplastic pollution layer on soil aggregates and organic carbon at different soil depths
AI summary Read the abstract
Researchers examined how oversized microplastic pollution layers in soil affect aggregate stability and organic carbon at different depths, finding that plastic films disrupted soil aggregate formation and altered carbon distribution, with effects varying by soil depth and plastic concentration.
Fate of plastic film residues in agro-ecosystem and its effects on aggregate-associated soil carbon and nitrogen stocks
AI summary Read the abstract
Researchers studied the fate of biodegradable and LDPE plastic film residues buried in agricultural soil over three years and found that biodegradable films did not meaningfully degrade under field conditions, both types altered soil aggregate structure and reduced carbon and nitrogen stocks compared to controls.
Unravelling the ecological ramifications of biodegradable microplastics in soil environment: A systematic review
AI summary Read the abstract
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.
Research digests by email
When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.