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20 resultsShowing papers similar to Microplastics Affect Sediment Phosphorus Transformation: Based on the Interplay of Bioturbation and Microbial Regulation
ClearEffects of microplastics on nitrogen and phosphorus cycles and microbial communities in sediments
Researchers found that PVC, PLA, and polypropylene microplastics altered nitrogen and phosphorus cycling in freshwater sediments by shifting microbial community composition, with effects varying by polymer type and biodegradability.
Distribution of microplastics in river sediments and consequences on bioturbation associated ecosystem processes
This thesis investigates the distribution of microplastics in freshwater river sediments and their effects on bioturbation processes that drive nutrient cycling, finding that microplastics disrupt the ecosystem functions performed by sediment-dwelling organisms. The work addresses a gap in standardized sampling methods and demonstrates that microplastic contamination can impair river ecosystem health beyond direct toxicity to individual organisms.
New insights into changes in phosphorus profile at sediment-water interface by microplastics: Role of benthic bioturbation
The study examined how different types of microplastics affect phosphorus cycling at the sediment-water interface through their impacts on burrowing chironomid larvae. Researchers found that both bio-based and fossil fuel-based microplastics altered the larvae's biochemical responses and disrupted phosphorus profiles, suggesting microplastics can indirectly affect nutrient dynamics in freshwater ecosystems.
Varied influence of aged microplastics and related leachates on phosphorus transformation and release from the sediments
Researchers investigated how aged microplastics and their chemical leachates affect phosphorus cycling in freshwater sediments, a process linked to harmful algal blooms. They found that different types of weathered plastics and their leachates altered microbial communities and shifted the forms of phosphorus present in sediments. The study suggests that microplastic pollution in lake and river sediments may contribute to nutrient imbalances that worsen water quality problems.
Microplastics alter the microbiota-mediated phosphorus profiles at sediment-water interface: Distinct microbial effects between sediment and plastisphere
This study found that microplastics in lake sediments change how bacteria process phosphorus, a key nutrient in freshwater ecosystems. Both petroleum-based and biodegradable microplastics altered bacterial communities and phosphorus cycling, but in different ways depending on whether bacteria were in the sediment or on the plastic surfaces. These changes could contribute to water quality problems like algal blooms that affect both ecosystems and the drinking water supply.
Impact of Microplastic Contamination on Phosphorus Availability, Alkaline Phosphatase Activity, and Polymer Degradation in Soil
Researchers studied how different types of microplastics at various concentrations affect phosphorus availability and enzyme activity in soil. They found that microplastics altered phosphorus cycling both by directly supplying phosphorus in some cases and by changing microbial enzyme function. The study suggests that microplastic contamination could disrupt soil nutrient dynamics important for maintaining agricultural productivity.
Influence of microplastics on nutrients and metal concentrations in river sediments
Researchers investigated how microplastics influence nutrient and metal concentrations in river sediments, finding that microplastics alter the distribution of pollutants through their capacity to adsorb contaminants and support biofilm formation on their hydrophobic surfaces.
Effects of microplastics on inorganic nitrogen dynamics in surface water sediments under different disturbance intensities
Laboratory experiments showed that microplastics in sediments alter nitrogen cycling in freshwater systems in ways that depend strongly on concentration: low levels boosted ammonium release, while high levels suppressed it and amplified nitrate consumption. These disruptions to the nitrogen cycle could affect water quality and aquatic productivity, especially in systems that are frequently disturbed by dredging or flooding.
Microplastic impacts on soil and sediment bioturbation: insights from microcosm experiments across diverse ecosystems
This study used microcosm experiments across terrestrial, freshwater, and marine ecosystems to assess whether microplastics affect bioturbation — the physical reworking of sediment and soil by organisms. Microplastic exposure reduced bioturbation activity in multiple ecosystems, with implications for nutrient cycling and sediment health.
Effects of Different-Sized Polyethylene Microplastics on Nitrogen Transformation in River Sediment-Water Systems
Researchers ran a 120-day indoor experiment to study how four different particle sizes of polyethylene microplastics affect nitrogen cycling in river sediment-water systems. They found that microplastic addition significantly altered nitrogen transformation processes, with effects depending on particle size.
Microplastics and benthic animals reshape the geochemical characteristics of dissolved organic matter by inducing changes in keystone microbes in riparian sediments
Researchers found that microplastics and benthic animals together reshape the geochemical characteristics of dissolved organic matter in riparian sediments. The study revealed that both stressors altered keystone microbial communities, leading to changes in how organic matter is processed in river ecosystems, with implications for pollutant behavior and nutrient cycling.
Microbial Community Dynamics and Biogeochemical Cycling in Microplastic-Contaminated Sediment
This review summarizes current research on how microplastics alter microbial communities and nutrient cycling processes in sediments at the bottom of water bodies. Researchers found that the effects depend on the type of plastic, exposure duration, and the specific sediment environment, with biodegradable plastics causing the most significant changes. The study highlights that microplastics in sediments can reshape the microbial ecosystems that drive essential biogeochemical processes like carbon and nitrogen cycling.
Microplastics affect organic nitrogen in sediment: The response of organic nitrogen mineralization to microbes and benthic animals
Researchers investigated how different types of microplastics affect organic nitrogen cycling in sediments, measuring the responses of key nitrogen-transforming microorganisms. They found microplastics alter the composition of organic nitrogen and suppress certain nitrogen cycling processes.
Insight into the transformation of phosphorus in soil affected by microplastics: A review
This meta-analysis found that microplastics significantly decrease phosphorus availability in soil by 7-56%, driven by particle characteristics, soil properties, and exposure duration. Microplastics alter phosphorus cycling through adsorption, changes in soil chemistry, shifts in microbial communities, and modified phosphatase activity, with implications for farmland fertility management.
Modelled broad-scale shifts on seafloor ecosystem functioning due to microplastic effects on bioturbation
This study modelled how microplastic contamination of marine sediments affects bioturbation — the mixing of sediment by bottom-dwelling organisms — and the cascading effects on seafloor ecosystem functions like nutrient cycling. The model predicts that in MP-contaminated sediments, organic matter accumulates in the oxygen-rich zone, stimulating aerobic respiration by around 18%. These results suggest microplastics can reshape fundamental biogeochemical processes in seafloor ecosystems at broad scales, with implications for ocean carbon and nutrient cycling.
Microplastic pollution drives soil bacterial community shifts and alters phosphorus cycling across land use gradients
Researchers conducted a landscape-scale field study across urban, mining, agricultural, and rural land-use types to measure accumulated microplastic levels and their effects on soil bacterial communities and phosphorus cycling. Microplastic contamination shifted bacterial community composition and impaired phosphorus mineralization, with effects scaling with land-use intensity and microplastic abundance.
Effects of micro(nano)plastics on soil nutrient cycling: State of the knowledge.
This review systematically examined how micro- and nano-plastics affect soil nutrient cycling for carbon, nitrogen, and phosphorus, finding that physical interference with soil structure, alteration of microbial communities, and chemical toxicity collectively disrupt mineralization, nitrification, and phosphorus availability in contaminated soils.
Benthic Fauna Enhance Biodegradation of Microplastics in Riparian Sediments: Reactive Oxygen, Keystone Microbes, and Metabolites
Laboratory experiments found that benthic (bottom-dwelling) fauna accelerated the biodegradation of microplastics in riverine sediments through bioturbation and microbial activity. This suggests that diverse benthic communities may play an underappreciated role in naturally breaking down plastic pollution in freshwater ecosystems.
ConventionalandBiodegradable Microplastics BothImpair Soil Phosphorus Cycling and Availability via Microbial Suppression
This 150-day soil incubation study compared how conventional polyethylene and biodegradable polylactic acid microplastics affect microbially-mediated phosphorus cycling. Both MP types suppressed phosphorus-cycling microbial activity, reducing soil phosphorus availability — with biodegradable PLA showing comparable disruption to conventional PE.
New insight into ammonium removal in riverbanks under the exposure of microplastics
Researchers discovered that microplastic accumulation in riverbank sediments decreases ammonium removal capacity by 8-13%, caused by reduced abundance of nitrifying bacteria, revealing a previously unknown mechanism by which plastic pollution impairs natural water purification.