UV-aging reduces the effects of biodegradable microplastics on soil sulfamethoxazole degradation and sul genes development  

作　　者：Xuecong Sun Shaohua Tian Lelan You Xu Huang Jian-Qiang Su 

机构地区：[1]Key Lab of Urban Environment and Health,Institute of Urban Environment,Chinese Academy of Sciences,Xiamen 361021,China [2]University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Journal of Environmental Sciences》2025年第4期422-431,共10页环境科学学报(英文版)

基　　金：supported by the National Key Plan for Research and Development of China(Nos.2022YFE0120300 and 2020YFC1806902);the National Natural Science Foundation of China(Nos.42161134002,81991535,and 41877058);the Natural Science Foundation of Fujian Province,China(No.2022J01509).

摘　　要：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.

关 键 词：Biodegradable plastics UV-aging Antibiotics degradation Antibiotic resistance genes Microbial community 

分 类 号：X703[环境科学与工程—环境工程]