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Aging of biodegradable microplastics and their effect on soil properties: Control from soil water
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Researchers studied how biodegradable microplastics made from PLA and PBAT break down in different soil types under varying water conditions. They found that while these plastics aged more in dry and alternating wet-dry conditions, flooded conditions caused bigger changes to soil chemistry, including increased dissolved organic carbon. The study suggests that even biodegradable plastics can meaningfully alter soil properties, and the effects depend heavily on moisture conditions.
The ecological risks of biodegradable microplastics (BMPs) to soil ecosystems have received increasing attention. This study investigates the impacts of polylactic acid microplastics (PLA-MPs) and polybutylene adipate terephthalate microplastics (PBAT-MPs) on soil properties of black soil (BS) and fluvo-aquic soil (FS) under three water conditions including dry (Dry), flooded (FL), and alternate wetting and drying (AWD). The results show that BMPs exhibited more evident aging under Dry and AWD conditions compared to FL condition. However, BMPs aging under FL condition induced more substantial changes in soil properties, especially dissolved organic carbon (DOC) concentrations, than under Dry and AWD conditions. BMPs also increased the humification degree of soil dissolved organic matter (DOM), particularly in BS. Metagenomic analysis of PBAT-MPs treatments showed different changes in microbial community structure depending on soil moisture. Under Dry conditions, PBAT-MPs enhance the ammonium-producing process of soil microbial communities. Genes related to N nitrification and benzene degradation were enriched under AWD conditions. In contrast, PBAT-MPs do not change the abundance of genes related to the N cycle under FL conditions but significantly reduce genes related to benzene degradation. This reduction in benzene degradation genes under FL condition might potentially slow down the degradation of PBAT-MPs, and could lead to temporary accumulation of benzene-related intermediates. These findings highlight the complex interactions between BMPs, soil properties, and microbial communities, emphasizing the need for comprehensive evaluations of BMPs' environmental impacts under varying soil water conditions.
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Differential aging processes of microplastics in paddy soil under wet-dry alternation: Insights into chemical structure alteration and dissolved organic matter formation
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Researchers investigated the aging of polyethylene, polypropylene, and polystyrene microplastics in paddy soil during seven wet-dry alternation cycles over 98 days and found that cycling conditions accelerated chemical degradation and altered dissolved organic matter (DOM) composition. PE aged most rapidly, and the DOM produced differed structurally from that generated under constant conditions.
Effects of polylactic acid microplastics on dissolved organic matter across soil types: Insights into molecular composition
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Researchers investigated how biodegradable polylactic acid microplastics affect dissolved organic matter in three different types of paddy soil. They found that the microplastics altered the molecular composition of organic matter in soil-specific ways, with some soils showing increased humic substances and others showing more protein-like compounds. The study highlights that even biodegradable plastics can change soil chemistry, and the effects vary depending on soil type.
Microplastic-induced soil organic carbon transformation: Evaluating the risks of conventional and biodegradable polymers during wet-dry cycles
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Researchers examined how both conventional and biodegradable microplastics alter soil organic carbon fractions—including dissolved, microbial biomass, and particulate carbon—during wet-dry cycles, using fluorescence spectroscopy, CO2 flux measurements, and 16S rRNA sequencing to track how polymer type reshapes carbon transformation pathways and microbial communities.
Mechanism of polyethylene and biodegradable microplastic aging effects on soil organic carbon fractions in different land-use types
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Researchers compared how polyethylene and biodegradable microplastics at different stages of aging affect soil organic carbon fractions across various land-use types. The study found that both types of microplastics altered soil carbon dynamics, but the effects depended on the plastic type, its degree of aging, and the specific land-use context.
Addition of biodegradable microplastics alters the quantity and chemodiversity of dissolved organic matter in latosol
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Researchers found that adding biodegradable PBAT microplastics to tropical soil increased microbial and enzyme activity, which in turn altered the quantity and chemical diversity of dissolved organic matter, suggesting biodegradable plastics still significantly affect soil biogeochemistry.
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