Effects of Microplastics and Organic Fertilizer Regulation on Soil Dissolved Organic Matter Evolution.

IF 3.9 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES Toxics Pub Date : 2024-09-26 DOI:10.3390/toxics12100695

Cheng Li, Chunhai Wang, Le Liu

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Abstract

Microplastics are pollutants of global concern nowadays. However, the effects of microplastics addition to soil as a carbon source and the combined effects of microplastics and organic fertilizer on soil-dissolved organic matter (DOM) evolution are still unclear. This study focused on the evolution of DOM in soil with the addition of microplastics and investigated the variations in the content and composition of DOM in unfertilized and fertilized soil with different particle sizes of microplastics. It was observed that the TOC concentration of the soil DOM in the treatment with organic fertilizer and microplastics increased more (129.97-161.43 mg kg^-1) than that in the treatment with microplastics alone (117.17-131.87 mg kg^-1) and was higher than that in the original soil (95.65 mg kg^-1). According to the humic acid relative abundance in DOM after 40 days of incubation, the humic acid relative abundance in DOM of the soil samples with microplastics and organic fertilizers addition was found to be higher than that in those with microplastic addition alone, reaching more than 80% in a short time. In conclusion, the TOC concentration of the soil DOM increased with the addition of microplastics, and the increase was more pronounced when organic fertilizers and microplastics were added together. Moreover, the soil humification increased to a higher level in the short term with the combined addition of microplastics and organic fertilizers, which was maintained during the long-term incubation process.

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微塑料和有机肥料调节对土壤溶解有机物演化的影响。

微塑料是当今全球关注的污染物。然而，在土壤中添加微塑料作为碳源以及微塑料和有机肥对土壤溶解有机物（DOM）演变的综合影响尚不清楚。本研究主要关注微塑料添加后土壤中 DOM 的演变，并研究了不同粒径微塑料在未施肥土壤和施肥土壤中 DOM 含量和组成的变化。结果表明，在施用有机肥和微塑料的处理中，土壤 DOM 的 TOC 浓度（129.97-161.43 mg kg-1）比单独施用微塑料的处理（117.17-131.87 mg kg-1）增加得更多，且高于原始土壤（95.65 mg kg-1）。根据培养 40 天后 DOM 中腐植酸的相对丰度，发现添加微塑料和有机肥的土壤样品 DOM 中腐植酸的相对丰度高于只添加微塑料的土壤样品，在短时间内达到 80% 以上。总之，土壤 DOM 的总有机碳浓度随着微塑料的添加而增加，当有机肥和微塑料一起添加时，这种增加更为明显。此外，在添加微塑料和有机肥的情况下，土壤腐殖化程度在短期内提高，并在长期培养过程中保持不变。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Toxics Chemical Engineering-Chemical Health and Safety

CiteScore

4.50

自引率

10.90%

发文量

681

审稿时长

6 weeks

期刊介绍： The Journal accepts papers describing work that furthers our understanding of the exposure, effects, and risks of chemicals and materials in humans and the natural environment as well as approaches to assess and/or manage the toxicological and ecotoxicological risks of chemicals and materials. The journal covers a wide range of toxic substances, including metals, pesticides, pharmaceuticals, biocides, nanomaterials, and polymers such as micro- and mesoplastics. Toxics accepts papers covering: The occurrence, transport, and fate of chemicals and materials in different systems (e.g., food, air, water, soil); Exposure of humans and the environment to toxic chemicals and materials as well as modelling and experimental approaches for characterizing the exposure in, e.g., water, air, soil, food, and consumer products; Uptake, metabolism, and effects of chemicals and materials in a wide range of systems including in-vitro toxicological assays, aquatic and terrestrial organisms and ecosystems, model mammalian systems, and humans; Approaches to assess the risks of chemicals and materials to humans and the environment; Methodologies to eliminate or reduce the exposure of humans and the environment to toxic chemicals and materials.