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Temporal Dynamics of Soil Dissolved Organic Matter Influenced by Biochar and Microplastics: Insights from Molecular and Optical Signatures
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Scientists found that adding biochar (a charcoal-like soil additive) to farmland soil changes how plastic pollution breaks down, with iron-enhanced biochar speeding up the breakdown of biodegradable plastics into simpler carbon compounds, while regular plastic waste sticks around longer and stays more chemically stable. This matters because it shows biochar could be a practical tool for helping soils process plastic pollution faster, but the type of plastic and biochar used makes a big difference, meaning not all "eco-friendly" solutions work the same way in real farmland.
Microplastic (MP) pollution in soil has raised concerns about its impact on the dynamics of dissolved organic matter (DOM). Biochar (BC) influence MP-induced DOM dynamics, the specific mechanisms, especially for iron-modified biochar (FeBC), remain poorly understood. Here, we investigated the effects of BCs and FeBCs on DOM composition in paddy soil amended with biodegradable (polybutylene succinate, PBS) and conventional (polystyrene, PS) MPs over a 60-day incubation, using combined optical (EEM-PARAFAC) and ultrahigh-resolution mass spectrometric (FT-ICR MS) characterization. Unmodified BCs increased DOM solubilization and increased the relative enrichment and abundance of aromatic DOM components under the present incubation conditions, whereas FeBCs accelerated microbial activity (biological index, BIX: 1.11-1.47 vs. 0.76 in control) and DOM turnover. In PBS-amended soils, FeBC enhanced dissolved organic matter release (DOC: 474 mg/kg in PBS+FeBC vs. 279 mg/kg in control), leading to the accumulation of labile, low-molecular-weight organic fractions (molecular lability boundary index, MLB index: 0.211 vs. 0.152 in control), and molecular turnover (time-decay slope: 0.069). In contrast, PS-enriched soils retained more aromatic, lignin-like, and recalcitrant DOM fractions. PBS treatments showed time-decay patterns (slope=0.007-0.069) consistent with rapid DOM transformations, while PS-amended soils maintained chemically stable DOM pool (slope=0.006-0.017). Thermodynamic modeling showed that PBS-induced transformations were largely spontaneous (ΔG° ≤ 0), while PS required energy input (ΔG° > 0). These findings highlight how BC and Fe modification distinctly regulate MP-induced DOM dynamics, with implications for carbon persistence and soil health.
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Scientists found that adding biochar (a charcoal-like material made from plant waste) to soil contaminated with microplastics helped restore healthy microbial communities and nutrient cycling. The biochar reversed negative effects that microplastics had on soil chemistry, including nitrogen and phosphorus availability. This suggests biochar could be a practical tool for repairing farmland damaged by microplastic pollution.
Biochar alters chemical and microbial properties of microplastic-contaminated soil
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Researchers found that biochar amendments improved chemical and microbial properties of microplastic-contaminated soil, with effects varying by biochar type and water conditions, suggesting biochar as a potential remediation tool for plastic-polluted agricultural soils.
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Plastic pollution in farm soil is a growing problem, but this study found that adding biochar (charcoal made from plant waste) or organic materials like compost and manure can help soils recover. These additions restored nutrients, improved soil structure, and boosted helpful microbes, offering a practical way to protect the soil that grows our food.
[Effects of Biochar on the Growth of Chrysanthemum morifolium and the Structure and Function of Soil Bacterial Communities under Microplastic Pollution].
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This study found that adding biochar (a charcoal-like soil additive made from organic waste) to soil contaminated with microplastics helped chrysanthemum plants grow better and boosted the health of beneficial soil bacteria. This matters because microplastics are increasingly polluting farmland soil, and finding low-cost ways to counteract their harmful effects could help protect the food crops we eventually eat and the soil ecosystems that support them.
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Biochar amendments to soil were shown to offset the destabilizing effects that microplastics have on soil aggregate structure. The finding suggests that biochar could be a practical soil amendment to counteract microplastic-driven soil degradation in contaminated agricultural lands.
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