Summary
This microcosm study investigated how four types of biochar altered the chemical and microbial properties of low-density polyethylene microplastic-contaminated soil under contrasting water regimes. Biochar application variably modified soil pH, nutrient availability, and enzyme activities, with oilseed rape straw-derived biochars showing the strongest effects on pH and exchangeable cations. Bacterial community diversity increased with biochar in well-watered conditions but showed negligible variation under drought, suggesting water availability modulates biochar-microbe interactions in contaminated soils.
Regional applicability
The findings are transferable to United Kingdom soil management contexts where microplastic contamination is an emerging concern. However, the laboratory microcosm design does not account for field heterogeneity, seasonal variation, or UK-specific soil types and climate conditions; field validation would be needed to inform practical soil amendment recommendations.
Key measures
Soil pH, electrical conductivity (EC), available phosphorous, total exchangeable cations (TEC), fluorescein diacetate activity, urease activity, acid phosphatase activity, bacterial community diversity indices, bacterial phyla abundance
Outcomes reported
The study measured changes in soil chemical properties (pH, electrical conductivity, available phosphorous, exchangeable cations), soil enzyme activities, and bacterial community diversity and composition in microplastic-contaminated soil amended with four biochar types under drought and well-watered conditions.
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