紫外线老化可减少可生物降解的微塑料对土壤中磺胺甲噁唑降解和磺胺基因发育的影响

IF 5.9 2区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES Journal of Environmental Sciences-china Pub Date : 2024-04-01 DOI:10.1016/j.jes.2024.03.040
Xuecong Sun , Shaohua Tian , Lelan You , Xu Huang , Jian-Qiang Su
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引用次数: 0

摘要

近年来,生物降解塑料已广泛应用于工业、农业和日常生活中。本文比较研究了聚对苯二甲酸丁二酯(PBAT)和聚羟基烷酸酯(PHA)这两种可生物降解的微塑料(BMP)在不同种类、用量和状态下对土壤磺胺甲噁唑(SMX)降解和玷污基因发育的影响。按照 PBAT > PHA 和高剂量 > 低剂量的顺序,添加原生 BMPs 能显著增加土壤 DOC。同时,原生 PBAT 能明显降低土壤 pH 值。总体而言,BMPs 的添加不仅促进了土壤 SMX 的降解,而且还增加了土壤钙质基因的丰度,但原始 PBAT 中 pH 值的降低抑制了钙质基因的增殖。BMP 对土壤微生物多样性的驱动效应与对 DOC 的驱动效应顺序相同。受 BMPs 刺激的特定细菌(如节杆菌和两个隶属于 TM7 门的菌属)导致 SMX 降解加速。耐人寻味的是,紫外线老化阻碍了 BMPs 中 DOC 的释放和 pH 值的降低,减轻了对微生物群落的刺激,最终降低了 BMPs 对 SMX 降解和苏木基因增殖的促进作用。我们的研究结果表明,在受 BMPs 影响的环境中,应更多地关注 ARGs 的增殖风险,有时可以采用紫外线老化来降低这种风险。
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UV-aging reduces the effects of biodegradable microplastics on soil sulfamethoxazole degradation and sul genes development

In recent years, the biodegradable plastics has extensively used in industry, agriculture, and daily life. Herein, the effects of two biodegradable microplastics (BMPs), poly(butyleneadipate-co-terephthalate) (PBAT) and polyhydroxyalkanoate (PHA), on soil sulfamethoxazole (SMX) degradation and sul genes development were comparatively studied based on the type, dosage, and state. The addition of virgin BMPs significantly increased soil DOC following a sequential order PBAT > PHA and high dose > low dose. Meanwhile virgin PBAT significantly reduced soil pH. In general, the addition of BMPs not only promoted soil SMX degradation but also increased the abundance of sul genes, with an exception that pH reduction in virgin PBAT inhibited the proliferation of sul genes. The driving effects of BMPs on soil microbial diversity following the same order as that on DOC. Specific bacteria stimulated by BMPs, such as Arthrobacter and two genera affiliated with phylum TM7, accounted for the accelerated degradation of SMX. Intriguingly, UV-aging hindered the release of DOC from BMPs and the reduction in pH, mitigated the stimulation of microbial communities, and ultimately reduced the promotion effect of BMPs on SMX degradation and sul genes proliferation. Our results suggest that more attention should be paid to the proliferation risk of ARGs in the environment affected by BMPs and UV-aging can be employed sometimes to reduce this risk.

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来源期刊
Journal of Environmental Sciences-china
Journal of Environmental Sciences-china 环境科学-环境科学
CiteScore
13.70
自引率
0.00%
发文量
6354
审稿时长
2.6 months
期刊介绍: The Journal of Environmental Sciences is an international journal started in 1989. The journal is devoted to publish original, peer-reviewed research papers on main aspects of environmental sciences, such as environmental chemistry, environmental biology, ecology, geosciences and environmental physics. Appropriate subjects include basic and applied research on atmospheric, terrestrial and aquatic environments, pollution control and abatement technology, conservation of natural resources, environmental health and toxicology. Announcements of international environmental science meetings and other recent information are also included.
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