State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China.
State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China.
J Hazard Mater. 2023 Oct 5;459:132139. doi: 10.1016/j.jhazmat.2023.132139. Epub 2023 Jul 25.
The land-use of organic fertilizers is considered as an important sustainable method for resource utilization, which may have an impact on the microplastic behaviors in the soil. Here, a 240-d dark culture experiment was conducted to reveal the degradation and biofilm characteristics of degradable and refractory granule microplastics in soil and soil-fertilizer systems. The results indicated that microplastics generally exhibited a weak weight loss as well as a specific etiolation on the surface after the culture, especially polyvinyl-chloride and polyhydroxyalkanoates (PHA). Increase in carbon-oxygen functional groups and the changes of oxygen/carbon ratios were noticed, which implied that oxidation and degradation occurred on the surface of microplastics during the cultural process. The changes were more intense on the degradable PHA, and the fertilized-soil treatment than those of the refractory microplastics and the pure soil. Moreover, the addition of organic fertilizers enriched the community diversity of bacterial biofilm on multiple microplastic surfaces. In this regard, the animal fertilizers provided a stronger effect than the plant fertilizers. Overall, the soil, fertilizer and microplastic types affected the community structure and diversity of bacterial biofilm. The outcomes of this study would provide a theoretical basis for the utilization of organic matters for agricultural soil applications.
有机肥的土地利用被认为是资源利用的一种重要可持续方法，它可能会对土壤中的微塑料行为产生影响。在这里，进行了为期 240 天的黑暗培养实验，以揭示可降解和难降解颗粒状微塑料在土壤和土壤-肥料系统中的降解和生物膜特性。结果表明，培养后微塑料通常表现出微弱的重量损失和表面特定的黄化，尤其是聚氯乙烯和聚羟基脂肪酸酯（PHA）。注意到增加了碳-氧官能团和氧/碳比的变化，这表明在培养过程中微塑料表面发生了氧化和降解。在可降解的 PHA 和施肥土壤处理中变化更为剧烈，而在难降解的微塑料和纯土壤中变化则较小。此外，有机肥的添加丰富了多种微塑料表面上细菌生物膜的群落多样性。在这方面，动物肥料比植物肥料的效果更强。总体而言，土壤、肥料和微塑料类型影响了细菌生物膜的群落结构和多样性。本研究的结果将为农业土壤应用中有机物的利用提供理论依据。
