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Microplastic-Induced Alterations in Soil Aggregate-Associated Carbon Stabilization Pathways: Evidence from δ13C Signature Analysis
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Researchers conducted a year-long field experiment to understand how different types of microplastics affect carbon storage in soil. They found that conventional plastics like polyethylene and PVC destabilized soil structures and released stored carbon, while biodegradable plastics like PLA and PHA helped maintain soil integrity. The study provides evidence that the type of plastic contaminating agricultural soils significantly influences whether carbon is retained or lost.
Microplastics (MPs) are known to affect soil carbon stability in a numerous ways. However, the mechanisms by which they alter the carbon stability within soil aggregates remain unclear . Herein, a one-year field experiment was conducted in an arid agricultural region employing stable isotope techniques to evaluate the soil organic carbon flow in the presence of both persistent (PE, PVC) and biodegradable (PLA, PHA) MPs. PE and PVC reduced the stability of soil aggregates, while PLA and PHA maintained it. Additionally, organic carbon content increased in microaggregates but decreased in small macroaggregates for PE and PVC treatments. By contrast, treatment with PLA and PHA enhanced organic carbon content across aggregates. The δ13C values of PE- and PVC-treated aggregates ranged from -25.34 to -20.85‰, while those of PLA and PHA ranged from -16.29 to -9.26‰. Notably, MPs altered the direction of carbon flow between aggregates, reduced carbon flux, and accelerated carbon emissions. RFP and PLS-PM analyses revealed that persistent MPs affected carbon flow primarily via abiotic factors, whereas biodegradable MPs influenced it via biotic factors. These findings provide insights into the mechanisms by which MPs impact aggregate-associated carbon, highlighting their effects on soil ecosystem services.
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Researchers investigated how non-biodegradable polyethylene (PE) and biodegradable polylactic acid (PLA) microplastics affect plant carbon input and soil carbon turnover in a dryland agroecosystem over two years using 13CO2 pulse-labeling. They found that both microplastic types did not significantly alter plant carbon fixation but accelerated soil carbon loss, with implications for climate change feedbacks in agricultural soils.
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