We can't find the internet
Attempting to reconnect
Something went wrong!
Hang in there while we get back on track
Microplastics As Modulators Of Soil Nutrient Cycling Under Hydrological Connectivity In Earth's Critical Zone
AI summary Read the abstract
Tiny plastic bits from mulch, sludge, and tire wear are building up in farm soils and messing with how the soil handles carbon and nitrogen — this review of existing studies found effects like increased greenhouse gas emissions and disrupted nutrient cycles that plants need to grow. This matters because healthier soil means safer, more reliable food production, and the chemicals released from tire particles (like a toxic compound called 6PPD-quinone) are showing up in concerning amounts near roads, raising questions about their broader environmental and health impact that scientists are still working to understand.
Microplastics have emerged as pervasive contaminants in terrestrial ecosystems, with agricultural soils serving as major sinks through sources including plastic mulch, sewage sludge, and atmospheric deposition. This comprehensive review synthesizes current knowledge on how microplastics modulate soil nutrient cycling within the Earth's Critical Zone, with particular emphasis on the mediating role of hydrological connectivity. The physical presence of microplastics fundamentally alters soil structure, porosity, aggregate stability, and hydraulic properties in polymer- and concentration-dependent manners, creating preferential flow pathways that govern both microplastic transport and nutrient dynamics. Biodegradable microplastics generally exert more pronounced effects than conventional polymers, increasing CO₂ emissions while simultaneously altering microbial carbon use efficiency. Nitrogen cycling is consistently disrupted, with reduced nitrate concentrations, enhanced N₂O emissions (up to 140.6% increase), and shifts in nitrogen-transforming microbial guilds. Tire wear particles and their associated chemicals, particularly the highly toxic transformation product 6PPD-quinone, represent emerging contaminants of high concern with substantial emissions (estimated 79.5 kt annually in the U.S.), accumulation in roadside soils (up to 26,400 mg/kg), and demonstrated toxicity to soil biota. The effects of microplastics on nutrient cycling are profoundly context-dependent, modulated by soil properties, microplastic characteristics, environmental conditions, and biological factors. Significant knowledge gaps remain regarding deep Critical Zone processes, temporal dynamics, and interactive effects with global change factors. As plastic production continues to increase, understanding and mitigating the effects of microplastics on soil nutrient cycling under varying hydrological regimes represents a pressing environmental imperative with implications for soil health, agricultural productivity, and climate regulation.
More Papers Like This
Microplastics As Modulators Of Soil Nutrient Cycling Under Hydrological Connectivity In Earth's Critical Zone
AI summary Read the abstract
This review pulls together research showing that tiny plastic particles in farm soil are messing with how soil handles carbon and nitrogen, disrupting the natural processes that keep soil healthy and fertile. It also flags tire particles and a toxic chemical they release (6PPD-quinone) as an emerging concern, since these are building up in roadside soils and harming soil organisms. This matters because healthy soil underpins the food we eat, so long-term damage to soil nutrient cycles could eventually affect crop quality and food security, even though direct human health effects are still being studied.
Effects of microplastics on soil C and N cycling with or without interactions with soil amendments or soil fauna
AI summary Read the abstract
A meta-analysis of soil experiments found that microplastics significantly disrupt carbon and nitrogen cycling — the fundamental processes that keep soils fertile and regulate greenhouse gas emissions — especially when microplastics interact with fertilizers, heavy metals, or soil animals like earthworms. The type of plastic and the presence of other stressors compounded the effects, with some combinations causing substantially greater disruption than either factor alone. This matters because agricultural soils are heavily contaminated with microplastics from mulch films and other sources, threatening both food production and climate regulation.
Microplastic-induced agricultural soil carbon dynamics: A global meta-analysis of property-dependent effects and underlying mechanisms
AI summary Read the abstract
Tiny plastic bits in farm soil are messing with how soil stores carbon and releases CO2, changing soil chemistry in ways that could affect crop growth and soil health long-term. This matters because the food we eat grows in this soil, and disrupted soil health can ripple into food quality and our broader environment, even though direct human health impacts still need more research.
Soil Microplastic Pollution Across Terrestrial Ecosystems: A Review of Sources, Distribution Patterns, Polymer Types and Environmental Implications
AI summary Read the abstract
Tiny plastic bits from things like farm mulch, car tires, and trash are building up in soil everywhere—farms, cities, and even forests—and the smallest pieces can sink deep into the ground where they're more likely to be taken up by plants and soil organisms. This matters for us because these plastics can enter the food we grow, and this review (a summary of many existing studies) shows scientists still don't fully understand the long-term health and environmental risks, meaning better plastic recycling and management are urgently needed.
Microplastics in Agroecosystems: Effects on Soil Microbiome, Nutrient Dynamics, and Fungal Interactions
AI summary Read the abstract
This review pulls together existing research showing that tiny plastic particles building up in farm soil can throw off the natural processes that keep soil healthy—disrupting helpful microbes, weakening nutrient cycles like nitrogen fixation, and harming beneficial fungi that plants rely on. Since these disruptions can hurt crop growth and soil fertility, and since microplastics may work their way into the food we eat, this matters for both the food supply and potential long-term human health effects that scientists are still working to understand.
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.