We can't find the internet
Attempting to reconnect
Something went wrong!
Hang in there while we get back on track
Microplastic type, size & dose dependence impairs Pinus massoniana growth, nutrient uptake & rhizosphere enzymes under high exposure levels
AI summary Read the abstract
Scientists found that high levels of microplastic pollution in soil can stunt the growth of pine tree seedlings and reduce their ability to absorb key nutrients like nitrogen, while also disrupting helpful soil microbes. This matters because forests play a huge role in filtering our air and water, if microplastics are piling up enough in soil to weaken tree health, that's a warning sign for the broader ecosystems we depend on, though the study used unusually high plastic concentrations, so real-world forest soils may see smaller effects.
Microplastic pollution in terrestrial ecosystems is an emerging environmental concern, yet its effects on forest trees remain poorly understood. Here, we investigated how polymer type (polystyrene [PS], polypropylene [PP], polyvinyl chloride [PVC], polyethylene [PE], polyethylene terephthalate [PET]), particle size (100 nm, 5 μm, 250 μm), and concentration (0.1%, 1% w/w) of microplastics influence the growth, nutrient uptake, and rhizosphere enzyme activities of Pinus massoniana seedlings. Elevated microplastic concentrations were applied to elucidate mechanistic responses and upper-bound effect under high-exposure scenarios rather than environmentally typical forest soil conditions. Overall, microplastic exposure significantly reduced seedling growth, with dry biomass decreased by 12–45% relative to the control. Nitrogen uptake declined consistently across treatments (54–77%), with the strongest inhibition observed under the 5 μm PS treatment. Phosphorus and potassium uptake were also adversely affected by microplastics, though the responses were more variable, with significant suppression especially at the higher contamination level (1% w/w). In the rhizosphere, urease and acid phosphatase activities were generally reduced, whereas β-1,4-glucosidase activity often increased (up to a 65% rise) under microplastic stress. Three-way ANOVA revealed significant interactions among polymer type, size, and concentration (P < 0.001), indicating multifactorial control of toxicity. Among the tested polymers, PP exerted the most pronounced overall phytotoxic effects, while smaller particles and higher doses consistently intensified adverse impacts. These results demonstrate that microplastics can impair forest seedling performance and associated soil enzymatic processes under conditions of substantial accumulation, highlighting the need to assess ecological risks across environmentally realistic exposure gradients.
More Papers Like This
Growth, Root, Photosynthetic, and Soil Responses of Poplar Seedlings to an Equal-Mass PVC–PE–PS Microplastic Mixture
AI summary Read the abstract
Scientists found that when tree seedlings grew in soil with moderate-to-high levels of mixed microplastics (a blend of common plastic types like PVC and PE), the plants had stunted roots, weaker photosynthesis, and more cell damage, plus the soil itself lost some of its nutrient and enzyme health. This matters because it shows microplastic pollution isn't just a concern for oceans and animals, it can also weaken the soil and trees we rely on for reforestation and clean air, which ultimately ties back to the broader environmental systems that support human health.
The Effect of Microplastics on Soil Microbial Activity, Biomass, and Microbial Community Structure in Three Types of Temperate Forest
AI summary Read the abstract
Scientists found that tiny plastic particles in forest soil can shift the balance of microorganisms living there, favoring bacteria over fungi and reducing the total amount of microbial life when the plastic pieces are especially small. Since these soil microbes play a key role in breaking down nutrients and keeping forest ecosystems healthy, this suggests that widespread microplastic pollution could quietly disrupt the natural systems that support clean soil, water, and the food chain we ultimately depend on.
Interactive Effects of Microplastic Pollution and Global Warming on Soil Carbon and Nitrogen Dynamics in Subtropical Forests
AI summary Read the abstract
Scientists studied how tiny plastic particles (microplastics) affect forest soil when combined with warming temperatures, and found that these plastics disrupt how soil processes carbon and nitrogen - key nutrients that keep ecosystems healthy. The plastic pollution made soils more sensitive to temperature changes and altered important chemical cycles that plants depend on for growth. This matters because microplastics are everywhere in our environment, and this research shows they could harm the forest ecosystems that clean our air and water, especially as the planet continues to warm.
The Microplastic Menace: Polymer-Specific Impacts on Bacterial Communities and Carbon Cycling in Temperate Forest Soils
AI summary Read the abstract
Scientists found that tiny plastic bits (microplastics) in forest soil can mess with the bacteria that break down organic matter and cycle carbon, and the type of plastic matters, not just how much is there. This matters because these soil bacteria play a huge role in keeping ecosystems healthy and stable, and disrupting them could ripple out to affect soil fertility, plant growth, and even how much carbon stays trapped in the ground versus released into the air.
Microplastics in soil affect the growth and physiological characteristics of Chinese fir and Phoebe bournei seedlings
AI summary Read the abstract
Pot experiments with tree seedlings showed that high concentrations of polyethylene and polypropylene microplastics in soil suppressed plant growth by reducing chlorophyll levels, weakening antioxidant defenses, and lowering key nutrients in leaves. Lower concentrations of polyethylene actually had some positive effects, suggesting the impacts depend on dose and plastic type. These findings are relevant to understanding how microplastic-contaminated soils could affect forestry and reforestation efforts.
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.