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The Soil Ecosystem

The Soil Ecosystem

Plants obtain inorganic minerals and water from the soil, which acts as a natural medium for land plants. The composition and quality of soil depend not only on the chemical constituents but also on the presence of living organisms. In general, soils contain three major components:

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Updated: Jul 2, 2025

Separation and Identification of Conventional Microplastics from Farmland Soils

Separation and Identification of Conventional Microplastics from Farmland Soils

Published on: March 21, 2025

Microplastics alter soil structure and microbial community composition.

Lanfang Han¹, Liying Chen¹, Yanfang Feng²

¹Key Laboratory for City Cluster Environmental Safety and Green Development of the Ministry of Education, School of Ecology, Environment and Resources, Guangdong University of Technology, Guangzhou 510006, China.

Environment International

|February 20, 2024

Summary

This summary is machine-generated.

Both conventional and biodegradable microplastics (MPs) negatively impact soil structure by increasing microaggregates and decreasing macroaggregates. This alteration affects bacterial communities and ecosystem functions, with polyethylene (PE) showing stronger effects than polylactic acid (PLA) due to persistence.

Keywords:

Bacterial community structure Microbial co-occurrence network Microplastic contamination Soil aggregation Soil health

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Area of Science:

Environmental Science
Soil Science
Microbiology

Background:

Microplastics (MPs) are emerging contaminants affecting terrestrial ecosystems.
Both conventional (e.g., polyethylene) and biodegradable (e.g., polylactic acid) MPs impact soil structure and microbial communities.
Understanding MP effects at the aggregate scale is crucial for soil health.

Purpose of the Study:

To investigate the effects of conventional and biodegradable MPs on soil aggregate distribution and bacterial community composition.
To analyze how MP type and size influence soil aggregation and microbial networks.
To identify sensitive bacterial taxa and keystone species affected by MPs.

Main Methods:

Two MP types (PE and PLA) of varying sizes (50, 150, 300 μm) were added to soil at 0.5% (w/w).
Soil samples were incubated for one year under controlled greenhouse conditions.
Soil aggregation, bacterial community structure, and co-occurrence networks were analyzed.

Main Results:

MPs increased microaggregate proportion (17% to 32%) and decreased macroaggregate proportion (84% to 68%).
Aggregate stability decreased, linked to reduced binding agents.
MP type and amount significantly altered bacterial community structure (54% variance), with microaggregates being more sensitive.

Conclusions:

Both conventional and biodegradable MPs disrupt soil structure and alter bacterial communities, impacting ecosystem functions.
Polyethylene MPs had a stronger impact than polylactic acid MPs due to higher persistence.
Changes in bacterial communities, including keystone taxa, indicate significant ecological consequences.