Recent studies have been engaged in estimating the adverse effects of microplastic (MP) on soil quality parameters. Mass concentrations of MP, as found in highly contaminated soils, have been shown to weaken the soil structure, and parts of the edaphon are adversely affected mainly by the <100 µm MP size fraction. However, the vast majority of these studies used pristine particles, which have surface characteristics different from those of environmental MP. Exposed to UV radiation, plastic undergoes photochemical weathering with embrittlement and the formation of surface charge, leading to an alteration of physiochemical behavior. When plastic particles then enter the soil environment, further aging factors appear with yet unknown efficacy. This little explored soil biogeochemical phase includes biofilm cover, decay with enzymes (as shown in laboratory experiments with both conventional and biodegradable plastics), contact with biotic and abiotic acids, oxidants, and uptake by the soil fauna that causes physical fragmentation. Such transformation of the surfaces is assumed to affect soil aggregation processes, soil faunal health, and the transport of plastic colloids and adsorbed solubles. This perspective article encourages us to consider the weathering history of MP in soil experiments and highlights the need for reproducing the surface characteristics of soil MP to conduct laboratory experiments with closer-to-nature results.

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太阳之后会发生什么？土壤生物地球化学预风化与微塑性试验的结合

最近的研究一直致力于估计微塑料 (MP) 对土壤质量参数的不利影响。在高度污染的土壤中发现的 MP 质量浓度已被证明会削弱土壤结构，并且部分 edaphon 主要受到 < 100  µm MP 大小分数。然而，这些研究中的绝大多数使用了原始颗粒，其表面特性与环境 MP 不同。暴露在紫外线辐射下，塑料会发生光化学风化，脆化并形成表面电荷，从而导致物理化学行为的改变。当塑料颗粒进入土壤环境时，会出现进一步的老化因素，但效果尚不清楚。这个鲜为人知的土壤生物地球化学阶段包括生物膜覆盖、酶的衰变（如常规和可生物降解塑料的实验室实验所示）、与生物和非生物酸、氧化剂的接触以及导致物理破碎的土壤动物的吸收。假定表面的这种转变会影响土壤聚集过程、土壤动物健康、以及塑料胶体和吸附的可溶物的运输。这篇观点文章鼓励我们在土壤实验中考虑 MP 的风化历史，并强调需要重现土壤 MP 的表面特征以进行更接近自然结果的实验​​室实验。