Published in Agricultural Ecology and Environment, the review examines how biochar, microplastics, and naturally occurring soil organic carbon interact across several physical and biological scales. The researchers describe agricultural soil as a complex network of pores, mineral surfaces, aggregates, water films, and microbial habitats. Biochar and microplastics can occupy many of the same spaces, meaning their effects may overlap, reinforce one another, or change over time as particles weather and move through the soil.

Biochar can influence the soil carbon cycle in several ways. Its porous structure provides surfaces that can adsorb dissolved organic matter, including compounds that would otherwise be rapidly consumed by microbes or transported away with water. Biochar may also encourage the formation of soil aggregates, in which organic material becomes physically protected from decomposition. In addition, its surfaces can promote associations between organic molecules and soil minerals. These processes may slow the breakdown of carbon and alter the availability of nutrients and water.

Microplastics, however, can disrupt the same soil architecture. Tiny plastic particles change pore size and connectivity, potentially affecting the movement of water, oxygen, dissolved organic matter, and microorganisms. Their impact depends on the type of polymer involved, as well as particle shape, concentration, size, weathering, and the chemical properties of the surrounding soil. Some microplastics may stimulate microbial activity by providing surfaces for biofilms, while others can limit oxygen diffusion, alter moisture conditions, or interfere with microbial communities responsible for decomposing organic matter.

The review emphasizes that the combined effect of biochar and microplastics cannot be predicted simply by adding together their separate effects. Biochar may partially reduce some disturbances associated with microplastics by improving aggregation or offering additional surfaces onto which plastic-associated chemicals and dissolved organic compounds can attach. This could reduce the mobility of certain contaminants or change their availability to soil organisms. Yet the authors caution that the protective capacity of biochar may decline as both materials age, fracture, become coated with organic matter, or fill available sorption sites.

This aging process is especially important because soil is not a static environment. Rainfall, repeated wetting and drying, root growth, freeze-thaw cycles, and microbial activity can gradually alter biochar surfaces and break larger plastic fragments into smaller particles. Weathered microplastics may become more chemically reactive or develop cracks and oxygen-containing functional groups. At the same time, aged biochar may lose some of its original surface characteristics while gaining new mineral and microbial coatings. These transformations could change how carbon is stored, transported, and decomposed over years or decades.

The most immediate concern raised by the researchers involves carbon accounting. Standard soil organic carbon tests generally measure the amount of carbon in a soil sample, but they may not reliably distinguish among carbon derived from plants, carbon transformed by fire and added as biochar, and carbon contained in fossil-fuel-based plastic polymers. That distinction matters because these carbon pools have different origins, chemical structures, environmental behaviors, and implications for climate mitigation. A soil sample containing microplastics could therefore appear to hold more organic carbon even when part of that measurement represents persistent synthetic material rather than newly sequestered atmospheric carbon.

The potential scale of this problem is substantial. According to the review, if microplastic-derived carbon is not separately identified, concentrations equivalent to approximately 0.1% to 0.5% carbon in the upper 20 centimeters of an agricultural plough layer could contribute roughly 3 to 15 megagrams of carbon per hectare to routine soil carbon measurements. The estimate does not mean that every field contains this amount, nor that all measured polymer carbon would be counted as climate mitigation. Instead, it illustrates how synthetic carbon could create a false-positive signal in monitoring systems, especially where projects receive credits for increasing soil carbon stocks.

That issue directly affects measurement, reporting, and verification, or MRV, systems used by soil carbon programs and carbon removal markets. The authors propose an evidence-tiered framework combining polymer-specific analyses with techniques capable of separating pyrogenic carbon from native soil organic carbon. Such methods could include chemical and spectroscopic approaches that identify polymer signatures, assess the structure of fire-derived carbon, and track changes in carbon pools over time. Improved sampling strategies will also be necessary because microplastics and biochar are unlikely to be distributed evenly through a field; they may accumulate near soil surfaces, in irrigation pathways, or within particular aggregate fractions.

The review concludes that long-term field studies are urgently needed. Much of the existing evidence comes from short laboratory experiments using high concentrations of relatively uniform plastic particles and freshly produced biochar. Real agricultural soils contain weathered plastics of different sizes and compositions, mixed with roots, minerals, microorganisms, fertilizers, and changing moisture conditions. Future research will need to follow these systems over multiple growing seasons while measuring greenhouse-gas emissions, microbial activity, carbon chemistry, particle movement, and crop responses. The central message is clear: agricultural soils increasingly contain biogenic, pyrogenic, and synthetic carbon at the same time, and credible climate accounting will depend on telling those carbon sources apart.

Subject of Research: Biochar–microplastic interactions in agricultural soils and their implications for soil carbon storage and measurement

Article Title: Biochar-microplastic co-occurrence in agricultural soils: interfaces, effects on soil organic carbon, and implications for measurement and verification

News Publication Date: 28-May-2026

Web References: https://doi.org/10.48130/aee-0026-0014

References: Yang Z, Simarani K, Zhang X, Di Martino A, Chen Y, et al. 2026. “Biochar-microplastic co-occurrence in agricultural soils: interfaces, effects on soil organic carbon, and implications for measurement and verification.” Agricultural Ecology and Environment 2: e017. DOI: 10.48130/aee-0026-0014

Image Credits: Zhimei Yang, Khanom Simarani, Xi Zhang, Antonio Di Martino, Yi Chen, Yonglei Jiang, Binbin Hu, and Xiaodong Chen

Keywords

Biochar, microplastics, agricultural soils, soil organic carbon, carbon sequestration, soil carbon accounting, climate mitigation, pyrogenic carbon, synthetic carbon, measurement reporting and verification, soil microbiology, greenhouse gases, carbon removal, soil aggregates

The study reveals a concerning trend: various land-use types have distinctive impacts on the levels of microplastic contamination found in the soil. The researchers meticulously selected multiple sites across Thailand, each representing different land-use practices, such as agriculture, urban development, and preserved natural areas. This method allowed for a comprehensive analysis of how differences in human activity translate to variations in microplastic pollution.

One of the most alarming findings from the research is the alarming concentration of microplastics in agricultural lands, which raises questions about the safety of food production. The introduction of microplastics into the food chain presents severe health risks not only for consumers but also for the very ecosystems that support agriculture. The researchers measured microplastic particles in the soil, uncovering staggering amounts in areas subjected to intensive agricultural practices, which often rely heavily on plastic fertilizers and irrigation systems.

Furthermore, the research underscores that urban areas, characterized by dense populations and high levels of plastic waste, have significant amounts of microplastics in their soils as well. As urbanization continues to rise, the consequences of plastic pollution are becoming increasingly evident, with soil health deteriorating and biodiversity threatened. This study shines a light on how urban planning must adapt to mitigate the proliferation of microplastics within these environments.

Interestingly, the authors also noted lower levels of microplastic pollution in natural areas, suggesting that maintaining undisturbed ecosystems could be vital in combatting soil pollution. These findings advocate for a dual approach: while we must reform land-use practices in urban and agricultural sectors, preserving natural habitats also plays a crucial role in reducing microplastic contamination. The interplay between human activities and natural systems must be carefully managed to safeguard against ecological degradation.

Moreover, the research delves into the different types of microplastics found in the soil, including fibers, fragments, and beads. Each category has its sources and potential ramifications. For instance, microplastic fibers predominantly originate from synthetic textiles, which are washed out during laundry processes. This insight compels critical discussions about our consumption habits and clothing choices, encouraging a more sustainable laundry practice to reduce fiber shedding.

Another aspect of this research is its recommendations for sustainable land management practices. The authors propose that efforts to reduce plastic use in agriculture, such as biodegradable alternatives and improved waste management systems, could drastically lower the levels of microplastics entering soils. The implementation of these strategies not only tackles pollution but also enhances the sustainability of agricultural production.

Additionally, this study calls for heightened awareness and education among farmers and urban planners. Engaging local communities in the conversation about microplastics can foster a sense of responsibility and drive collective action. By understanding the consequences of their choices, stakeholders can contribute to a healthier environment and future.

The implications of this research extend beyond Thailand’s borders. As nations worldwide grapple with the growing threat of microplastic pollution, insights from this study could inform global policies and land management strategies. The urgency to address this issue is underscored by the potential long-term consequences of neglecting soil health and its connectivity to the food system and biodiversity.

In conclusion, the research by Imasha and Babel serves as a profound wake-up call regarding the multifaceted challenges posed by soil microplastic pollution. As humanity continues on this unsustainable trajectory, the time for decisive action is now. From rethinking agricultural practices to preserving natural ecosystems, our approach must evolve to ensure the sustainability of the planet for future generations.

The findings pave the way for future research, as more profound investigations are needed to ascertain the full impact of microplastics on soil chemistry and biology. Scientists must also explore innovative solutions to mitigate the problem. The era of microplastic awareness has just begun, and it heralds a critical opportunity for change.

As we navigate through this complex and urgent topic, the collaboration between scientists, policymakers, and the public will determine the trajectory of our environmental future. The fight against plastic pollution in all its forms is not just a local challenge but a global imperative that transcends borders and generations.

Through this extensive research, the spotlight is firmly placed on the need for adaptive land-use strategies and proactive measures that can stem the tide of microplastic pollution. In the face of environmental peril, proactive steps will not just protect soil health but ensure a sustainable world that nurtures future life.

Subject of Research: Soil microplastic pollution in relation to land use in Thailand.

Article Title: Land-use influence on soil microplastic pollution in Thailand: Implications for sustainable land management.

Article References:

Imasha, H.U.E., Babel, S. Land-use influence on soil microplastic pollution in Thailand: Implications for sustainable land management.
Environ Monit Assess 198, 199 (2026). https://doi.org/10.1007/s10661-026-15054-1

Image Credits: AI Generated

DOI: https://doi.org/10.1007/s10661-026-15054-1

Keywords: Soil pollution, microplastics, land use, sustainable management, Thailand.

PFAS have been widely used in a variety of applications such as firefighting foams, non-stick cookware coatings, food packaging, and textile treatments due to their unique ability to repel oil and water. However, their molecular architecture—characterized by strong carbon-fluorine bonds—grants them a remarkable persistence in the environment. As a result, once PFAS enter agricultural ecosystems, they exhibit long residence times, creating chronic exposure risks that are difficult to mitigate or reverse.

A critical pathway for PFAS contamination in farming environments includes the application of wastewater effluents and biosolids derived from municipal and industrial waste streams. These byproducts often contain PFAS residues, which, when introduced to agricultural soils, provide a steady source of chemical input. Moreover, irrigation with contaminated water and atmospheric deposition—especially proximal to PFAS-production industrial facilities—contribute to their widespread presence in farmlands. These diverse entry points make the control and prevention of PFAS accumulation in agriculture a complex challenge.

Once incorporated into the soil matrix, PFAS compounds show varying degrees of mobility depending on their chain length and chemical structure. Short-chain PFAS possess enhanced water solubility and lower sorption affinity to soil particles, facilitating their uptake into plant roots and transport within crops. This increased bioavailability in the rhizosphere means that vegetables, grains, and certain fruits are vulnerable to accumulating high concentrations of these substances, posing direct food safety concerns. In parallel, livestock exposed to contaminated feed or water may bioaccumulate PFAS in tissues, milk, and eggs, amplifying human exposure through animal-based products.

The toxicological profile of PFAS underscores their serious impact on human health. Extensive toxicology studies have linked exposure to these chemicals with immune system suppression, hepatic and renal toxicity, endocrine disruption, and elevated cancer risk. The insidious nature of PFAS contamination lies in their ubiquity and persistence, which leads to bioaccumulation and biomagnification along the food chain. Consequently, the continual ingestion of PFAS-laden foodstuffs represents a sustained public health hazard that demands urgent scientific and regulatory attention.

Regulatory frameworks addressing PFAS contamination in agricultural contexts remain nascent and fragmented globally. The European Union has taken preliminary steps toward setting maximum allowable limits for these chemicals in food products, but many jurisdictions, including the United States, have yet to establish comprehensive policies or enforceable standards. This regulatory lag complicates efforts to protect consumers and manage ongoing contamination risks, underscoring the need for harmonized international governance.

In addition to regulatory action, technological advancements are crucial for addressing PFAS pollution. Current remediation strategies for contaminated soils and waters include adsorption, ion exchange, and advanced oxidation processes; however, their effectiveness varies depending on the PFAS species and environmental conditions. Research focused on developing scalable, cost-effective soil and water treatment technologies is imperative to limit PFAS bioavailability in agricultural systems and to remediate existing contamination hotspots.

Monitoring programs designed to detect and quantify PFAS in agricultural matrices are another cornerstone of effective management. Implementing systematic surveillance in soils, water bodies, food products, and animal tissues can provide critical data for risk assessment and guide interventions. Such monitoring requires sensitive analytical techniques capable of distinguishing among the extensive variety of PFAS compounds, including both long-chain and emerging short-chain variants.

Collaboration across multiple sectors is essential to combat PFAS infiltration in agriculture. Farmers, scientists, policymakers, and public health advocates must work together to define sustainable agricultural practices that minimize PFAS inputs and promote soil and crop health. Public awareness campaigns can empower consumers to make informed choices, while fostering political will for stringent regulations and investment in innovative remediation research.

Ignoring the persistent and pervasive threat of PFAS contamination will likely result in long-term ecological damage and heightened human health burdens. As these substances accumulate silently in foundational food systems, their impacts could undermine agricultural sustainability and trust in food safety globally. Addressing this challenge head-on with proactive measures represents an urgent priority for the scientific community and society at large.

The article titled Per- and polyfluoroalkyl substances in agriculture: environmental fate, bioaccumulation and management presents a comprehensive perspective on the pathways, risks, and potential solutions associated with PFAS in agricultural environments. Authored by Hui Li, Ph.D., professor at Michigan State University, the work calls for immediate action encompassing improved environmental monitoring, regulatory development, and remediation technology advancement to safeguard both human health and ecological integrity.

By dissecting the multifaceted issue of PFAS contamination, this perspective illuminates previously underappreciated routes of environmental pollution to the dinner table. It emphasizes the importance of considering agricultural systems as long-term reservoirs for these harmful substances, not merely endpoints of pollution. Recognizing the complex dynamics of PFAS environmental fate and bioaccumulation is foundational to devising effective management strategies.

To support further research and policy formation, open access dissemination of this work through the journal New Contaminants fosters worldwide accessibility to critical scientific insights on emerging pollutants like PFAS. Ensuring transparency and widespread availability of up-to-date scientific findings strengthens global capacity to address these chemical threats holistically.

The convergence of scientific innovation, collaborative governance, and public engagement holds the potential to mitigate PFAS contamination challenges. As awareness grows and technological tools improve, it is anticipated that actionable solutions will emerge to protect agricultural systems and secure food safety for future generations.

Subject of Research: Not applicable

Article Title: Per- and polyfluoroalkyl substances in agriculture: environmental fate, bioaccumulation and management

News Publication Date: 5-Sep-2025

Web References:
https://www.maxapress.com/newcontam
http://dx.doi.org/10.48130/newcontam-0025-0005

References:
Li H. 2025. Per- and polyfluoroalkyl substances in agriculture: environmental fate, bioaccumulation and management. New Contaminants 1: e006

Keywords: Agriculture, Agricultural chemistry, Agricultural engineering, Agricultural policy, Dietary counseling