We can't find the internet
Attempting to reconnect
Something went wrong!
Hang in there while we get back on track
Microplastic shape, concentration and polymer type affect soil properties and plant biomass
AI summary Read the abstract
Experiments showed that microplastic shape, concentration, and polymer type all influence soil physical properties and plant biomass, with certain types reducing plant growth. The findings highlight that the wide variety of plastic particle types entering soils creates complex and variable ecological risks.
ABSTRACT Microplastics are an increasing concern in terrestrial systems. These particles can be incorporated into the soil in a wide range of shapes and polymers, reflecting the fact that manufacturers produce plastics in a variety of physical and chemical properties matching their intended use.Despite of this, little is known about the effects that the addition into the soil of microplastics of different shapes, polymer type and concentration levels may have on soil properties and plant performance. To fill this gap, we selected four microplastic shapes: fibers, films, foams and fragments; and for each shape we selected three microplastics made of one of the following polymers: polyester, polyamide, polypropylene, polyethylene, polyethylenterephthalat, polyurethane, polystyrene and polycarbonate. In a glasshouse experiment, each microplastic was added to a soil from a dry grassland at a concentration of 0.1%, 0.2%, 0.3% and 0,4%. A carrot ( Daucus carota ) plant grew in each pot during four weeks. At harvest, shoot and root mass, soil aggregation and microbial activity were measured. Our results showed that all microplastic shapes increased shoot and root masses. As concentration increased, microfibers increased plant biomass probably as fibers may hold water in the soil for longer. In contrast, microfilms decreased biomass with concentration, likely because they can create channels in the soil that promote water evaporation affecting plant performance. All microplastic shapes decreased soil aggregation, probably since microplastics may introduce fracture points in the aggregates affecting their stability and also due to potential negative effects on soil biota. The latter may also explain the decrease in microbial activity with, for example, polyethylene films. Similar to plant biomass, microfilms decreased soil aggregation with increasing concentration. Our study tested the microplastic shape mediation and dissimilarity hypotheses, highlighting the importance of microplastic shape, polymer type and concentration when studying the effects of microplastics on terrestrial systems.
More Papers Like This
Microplastic Shape, Polymer Type, and Concentration Affect Soil Properties and Plant Biomass
AI summary Read the abstract
Researchers tested how microplastics of different shapes, polymer types, and concentrations affect soil properties and plant growth using carrots as a model species. They found that microplastic fibers and films had the strongest effects on soil structure and water dynamics, while fragments and foams had less impact. The study demonstrates that the physical characteristics of microplastics matter as much as their chemical composition in determining their effects on agricultural soils.
Microplastics Can Change Soil Properties and Affect Plant Performance
AI summary Read the abstract
Researchers tested six different types of microplastics in soil and found that they altered key soil properties including water-holding capacity, bulk density, and microbial activity. These changes in soil structure had cascading effects on plant growth, with some microplastic types reducing above-ground biomass. The study demonstrates that microplastics can fundamentally change how soil functions, with consequences for plant health and ecosystem stability.
Effects of microplastics on soil microbiome: The impacts of polymer type, shape, and concentration
AI summary Read the abstract
Researchers examined how different microplastic polymer types, shapes, and concentrations affected soil bacterial communities, finding that these physical characteristics induced distinct shifts in soil microbiome composition and diversity.
Microplastics Increase Soil pH and Decrease Microbial Activities as a Function of Microplastic Shape, Polymer Type, and Exposure Time
AI summary Read the abstract
Researchers tested twelve different types of microplastics in soil and found that their effects on soil health depended heavily on the shape, plastic type, and how long they were present. Foam and fragment shapes raised soil pH the most, while polyethylene foam increased soil respiration, and several types reduced the activity of important soil enzymes. These findings help explain why microplastic studies often show conflicting results, since the specific characteristics of the plastic matter as much as its presence.
The effects of microplastics on crop variation depend on polymer types and their interactions with soil nutrient availability and weed competition
AI summary Read the abstract
Researchers investigated how different types of microplastics interact with soil nutrient availability and weed competition to affect crop growth. The study found that the effects of microplastics on plant performance depend on the polymer type and are modulated by fertilization levels and competition from weeds, suggesting that real-world agricultural impacts of microplastic pollution may be more complex than laboratory studies indicate.
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.