<br>微塑料对土壤团聚体形成和特性的尺寸和浓度依赖性影响,Journal of Hazardous Materials

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微塑料对土壤团聚体形成和特性的尺寸和浓度依赖性影响
Journal of Hazardous Materials ( IF 12.2 ) Pub Date : 2023-12-28 , DOI: 10.1016/j.jhazmat.2023.133395
Z Fang ₁ , J B Sallach ₁ , M E Hodson ₁

Affiliation

塑料碎片并威胁土壤生态系统。土壤结构退化是风险之一。尽管如此，仍缺乏不同尺寸的微塑料 (MP) 对土壤团聚体影响的数据。本研究系统地研究了不同尺寸（< 35、< 125、< 500 µm）和浓度（0、0.1、1.0、10 wt%）的原始聚乙烯粉末对两种对比土壤（林地土壤）团聚体形成及其特性的影响。，WS；农业土壤，AS）。 75 天的干湿循环在所有处理中都产生了新形成的聚集体。 MP 的大小和浓度影响 MP 的聚合，并且这随聚合大小的变化而变化；聚集体的尺寸分布也随着 MP 尺寸和浓度的变化而变化。含有 10 wt% < 35 µm MP 的土壤中产生的聚集体的 MWD（平均重量直径）显着低于对照。聚集体（> 4 mm）的润湿性随着 MP 暴露浓度的增加和 MP 暴露尺寸的减小而降低。 MP 的掺入降低了 WS 中骨料 (1-2 mm) 的水稳定性，但增加了 AS 中的水稳定性。随着 MP 浓度的增加，聚集体（> 4 mm）的颗粒密度显着降低，而 MP 尺寸则没有影响。随着时间的推移，MP 会分解、破碎并变小，它们对土壤聚集结构的潜在风险也会增加。

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Size- and concentration-dependent effects of microplastics on soil aggregate formation and properties

Plastics fragment and threaten soil ecosystems. Degradation of soil structure is one of the risks. Despite this, data on impacts of different sized microplastics (MPs) on soil aggregates is lacking. This study systematically investigated the effects of pristine polyethylene powders of different sizes (< 35, < 125, < 500 µm) and concentrations (0, 0.1, 1.0, 10 wt%) on aggregate formation and their properties for two contrasting soils (woodland soil, WS; agricultural soil, AS). 75 day wet-dry cycles produced newly-formed aggregates in all treatments. MP size and concentration impacted the incorporation of MPs in aggregates and this varied with aggregate size; the size distribution of aggregates also varied with MP size and concentration. Aggregates produced in soil containing 10 wt% < 35 µm MPs had significantly lower MWDs (mean weight diameters) than controls. The wettability of aggregates (> 4 mm) reduced with increasing MP exposure concentration and decreasing MP exposure size. MP incorporation decreased the water stability of aggregates (1–2 mm) in WS but increased it in AS. The particle density of aggregates (> 4 mm) significantly decreased with increasing MP concentration, whereas MP size had no effect. As MPs breakdown, fragment and become smaller over time, their potential risk to the aggregated structure of soil increases.

更新日期：2023-12-28

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