Summary
This laboratory study examined how networks of earthworm burrows (Lumbricus terrestris) and low-density polyethylene microplastics affect soil hydraulic properties and saturated water flow in repacked sandy soil columns. Earthworm burrowing significantly altered water flow pathways, evidenced by two-peaked breakthrough curves indicating faster macropore flow relative to soil matrix flow, with a significant correlation (r=0.571, p<0.05) between burrow volume and 5% tracer arrival time. Microplastics did not show significant effects on saturated water flow at the tested concentrations, suggesting minimal hydraulic impact at low MP loading rates.
UK applicability
The findings are potentially relevant to UK agricultural soils where anecic earthworms are common in temperate climates; however, the laboratory column setup may not fully represent field-scale heterogeneity and natural soil structures. The study's focus on saturated conditions and sandy soils means applicability to UK clay and loam soils requires further investigation.
Key measures
Macropore network parameters (number, length, volume, diameter); soil saturated conductivity; tracer breakthrough curves; relative arrival times (T5%, T25%, T50%); correlation between burrow volume and tracer arrival time
Outcomes reported
The study measured macropore network parameters (number, length, volume, diameter) and saturated water flow characteristics in soil columns, including soil saturated conductivity and tracer breakthrough curves. Results demonstrated that earthworm burrows create preferential water flow pathways, whilst microplastics at tested concentrations did not significantly affect saturated water flow.
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